[gpxview] Diff of /trunk/src/osm-gps-map-osd-classic.c

Diff of /trunk/src/osm-gps-map-osd-classic.c

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-revision 70 by harbaum,
Thu Aug 20 19:17:23 2009 UTC
+revision 133 by harbaum,
Mon Oct 12 20:27:55 2009 UTC
 Line 1
+ /* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */
+ /* vim:set et sw=4 ts=4 cino=t0,(0: */
  /*
   * Copyright (C) Till Harbaum 2009 <till@harbaum.org>
   *
-Line 15
+Line 17
   * with this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  #include "config.h"
+ #include <stdlib.h>  // abs
+ #include <string.h>
+ #include <math.h>    // M_PI/cos()
+ /* parameters that can be overwritten from the config file: */
+ /* OSD_DIAMETER */
+ /* OSD_X, OSD_Y */
- #ifdef USE_CAIRO
+ #ifndef USE_CAIRO
- #include <cairo.h>
+ #error "OSD control display lacks a non-cairo implementation!"
  #endif
+ #include <cairo.h>
+ #include "osm-gps-map.h"
+ #include "converter.h"
+ #include "osm-gps-map-osd-classic.h"
  //the osd controls
  typedef struct {
-     GdkPixmap *backup;
+     /* the offscreen representation of the OSD */
-     cairo_surface_t *overlay;
+     struct {
-     gint backup_x, backup_y;
+         cairo_surface_t *surface;
-     OsmGpsMapOsdGpsCallback cb;
+         gboolean rendered;
-     gpointer data;
+ #ifdef OSD_GPS_BUTTON
+         gboolean gps_enabled;
+ #endif
+     } controls;
+ #ifdef OSD_BALLOON
+     //a balloon with additional info
+     struct {
+         cairo_surface_t *surface;
+         int orientation, offset_x, offset_y;
+         gboolean just_created;
+         float lat, lon;
+         OsmGpsMapRect_t rect;
+         /* function called to have the user app draw the contents */
+         OsmGpsMapBalloonCallback cb;
+         gpointer data;
+     } balloon;
+ #endif
+ #ifdef OSD_SCALE
+     struct {
+         cairo_surface_t *surface;
+         int zoom;
+     } scale;
+ #endif
+ #ifdef OSD_CROSSHAIR
+     struct {
+         cairo_surface_t *surface;
+         gboolean rendered;
+     } crosshair;
+ #endif
+ #ifdef OSD_NAV
+     struct {
+         cairo_surface_t *surface;
+         float lat, lon;
+         char *name;
+         gboolean imperial;    // display distance imperial/metric
+     } nav;
+ #endif
+ #ifdef OSD_COORDINATES
+     struct {
+         cairo_surface_t *surface;
+         float lat, lon;
+     } coordinates;
+ #endif
+ #ifdef OSD_SOURCE_SEL
+     struct {
+         /* values to handle the "source" menu */
+         cairo_surface_t *surface;
+         gboolean expanded;
+         gint shift, dir, count;
+         gint handler_id;
+         gint width, height;
+         gboolean rendered;
+     } source_sel;
+ #endif
  } osd_priv_t;
- typedef struct {
+ #ifdef OSD_BALLOON
+ /* most visual effects are hardcoded by now, but may be made */
+ /* available via properties later */
+ #ifndef BALLOON_AREA_WIDTH
+ #define BALLOON_AREA_WIDTH           290
+ #endif
+ #ifndef BALLOON_AREA_HEIGHT
+ #define BALLOON_AREA_HEIGHT           75
+ #endif
+ #ifndef BALLOON_CORNER_RADIUS
+ #define BALLOON_CORNER_RADIUS         10
+ #endif
+ #define BALLOON_BORDER               (BALLOON_CORNER_RADIUS/2)
+ #define BALLOON_WIDTH                (BALLOON_AREA_WIDTH + 2 * BALLOON_BORDER)
+ #define BALLOON_HEIGHT               (BALLOON_AREA_HEIGHT + 2 * BALLOON_BORDER)
+ #define BALLOON_TRANSPARENCY         0.8
+ #define POINTER_HEIGHT                20
+ #define POINTER_FOOT_WIDTH            20
+ #define POINTER_OFFSET               (BALLOON_CORNER_RADIUS*3/4)
+ #define BALLOON_SHADOW               (BALLOON_CORNER_RADIUS/2)
+ #define BALLOON_SHADOW_TRANSPARENCY  0.2
+ #define BALLOON_W  (BALLOON_WIDTH + BALLOON_SHADOW)
+ #define BALLOON_H  (BALLOON_HEIGHT + POINTER_HEIGHT + BALLOON_SHADOW)
+ #define CLOSE_BUTTON_RADIUS   (BALLOON_CORNER_RADIUS)
+ /* draw the bubble shape. this is used twice, once for the shape and once */
+ /* for the shadow */
+ static void
+ osm_gps_map_draw_balloon_shape (cairo_t *cr, int x0, int y0, int x1, int y1,
+        gboolean bottom, int px, int py, int px0, int px1) {
+     cairo_move_to (cr, x0, y0 + BALLOON_CORNER_RADIUS);
+     cairo_arc (cr, x0 + BALLOON_CORNER_RADIUS, y0 + BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, -M_PI, -M_PI/2);
+     if(!bottom) {
+         /* insert top pointer */
+         cairo_line_to (cr, px1, y0);
+         cairo_line_to (cr, px, py);
+         cairo_line_to (cr, px0, y0);
+     }
+     cairo_line_to (cr, x1 - BALLOON_CORNER_RADIUS, y0);
+     cairo_arc (cr, x1 - BALLOON_CORNER_RADIUS, y0 + BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, -M_PI/2, 0);
+     cairo_line_to (cr, x1 , y1 - BALLOON_CORNER_RADIUS);
+     cairo_arc (cr, x1 - BALLOON_CORNER_RADIUS, y1 - BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, 0, M_PI/2);
+     if(bottom) {
+         /* insert bottom pointer */
+         cairo_line_to (cr, px0, y1);
+         cairo_line_to (cr, px, py);
+         cairo_line_to (cr, px1, y1);
+     }
+     cairo_line_to (cr, x0 + BALLOON_CORNER_RADIUS, y1);
+     cairo_arc (cr, x0 + BALLOON_CORNER_RADIUS, y1 - BALLOON_CORNER_RADIUS,
+                BALLOON_CORNER_RADIUS, M_PI/2, M_PI);
+     cairo_close_path (cr);
+ }
+ static void
+ osd_render_balloon(osm_gps_map_osd_t *osd) {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     /* get zoom */
+     gint zoom;
+     g_object_get(OSM_GPS_MAP(osd->widget), "zoom", &zoom, NULL);
+     /* ------- convert given coordinate into screen position --------- */
+     gint xs, ys;
+     osm_gps_map_geographic_to_screen (OSM_GPS_MAP(osd->widget),
+                                       priv->balloon.lat, priv->balloon.lon,
+                                       &xs, &ys);
+     gint x0 = 1, y0 = 1;
+     /* check position of this relative to screen center to determine */
+     /* pointer direction ... */
+     int pointer_x, pointer_x0, pointer_x1;
+     int pointer_y;
+     /* ... and calculate position */
+     int orientation = 0;
+     if(xs > osd->widget->allocation.width/2) {
+         priv->balloon.offset_x = -BALLOON_WIDTH + POINTER_OFFSET;
+         pointer_x = x0 - priv->balloon.offset_x;
+         pointer_x0 = pointer_x - (BALLOON_CORNER_RADIUS - POINTER_OFFSET);
+         pointer_x1 = pointer_x0 - POINTER_FOOT_WIDTH;
+         orientation |= 1;
+     } else {
+         priv->balloon.offset_x = -POINTER_OFFSET;
+         pointer_x = x0 - priv->balloon.offset_x;
+         pointer_x1 = pointer_x + (BALLOON_CORNER_RADIUS - POINTER_OFFSET);
+         pointer_x0 = pointer_x1 + POINTER_FOOT_WIDTH;
+     }
+     gboolean bottom = FALSE;
+     if(ys > osd->widget->allocation.height/2) {
+         priv->balloon.offset_y = -BALLOON_HEIGHT - POINTER_HEIGHT;
+         pointer_y = y0 - priv->balloon.offset_y;
+         bottom = TRUE;
+         orientation |= 2;
+     } else {
+         priv->balloon.offset_y = 0;
+         pointer_y = y0 - priv->balloon.offset_y;
+         y0 += POINTER_HEIGHT;
+     }
+     /* if required orientation equals current one, then don't render */
+     /* anything */
+     if(orientation == priv->balloon.orientation)
+         return;
+     priv->balloon.orientation = orientation;
+     /* calculate bottom/right of box */
+     int x1 = x0 + BALLOON_WIDTH, y1 = y0 + BALLOON_HEIGHT;
+     /* save balloon screen coordinates for later use */
+     priv->balloon.rect.x = x0 + BALLOON_BORDER;
+     priv->balloon.rect.y = y0 + BALLOON_BORDER;
+     priv->balloon.rect.w = x1 - x0 - 2*BALLOON_BORDER;
+     priv->balloon.rect.h = y1 - y0 - 2*BALLOON_BORDER;
+     cairo_t *cr = cairo_create(priv->balloon.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+     /* --------- draw shadow --------------- */
+     osm_gps_map_draw_balloon_shape (cr,
+                  x0 + BALLOON_SHADOW, y0 + BALLOON_SHADOW,
+                  x1 + BALLOON_SHADOW, y1 + BALLOON_SHADOW,
+                  bottom, pointer_x, pointer_y,
+                  pointer_x0 + BALLOON_SHADOW, pointer_x1 + BALLOON_SHADOW);
+     cairo_set_source_rgba (cr, 0, 0, 0, BALLOON_SHADOW_TRANSPARENCY);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgba (cr, 1, 0, 0, 1.0);
+     cairo_set_line_width (cr, 0);
+     cairo_stroke (cr);
+     /* --------- draw main shape ----------- */
+     osm_gps_map_draw_balloon_shape (cr, x0, y0, x1, y1,
+                  bottom, pointer_x, pointer_y, pointer_x0, pointer_x1);
+     cairo_set_source_rgba (cr, 1, 1, 1, BALLOON_TRANSPARENCY);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgba (cr, 0, 0, 0, BALLOON_TRANSPARENCY);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+     if (priv->balloon.cb) {
+         /* clip in case application tries to draw in */
+             /* exceed of the balloon */
+         cairo_rectangle (cr, priv->balloon.rect.x, priv->balloon.rect.y,
+                          priv->balloon.rect.w, priv->balloon.rect.h);
+         cairo_clip (cr);
+         cairo_new_path (cr);  /* current path is not
+                                  consumed by cairo_clip() */
+         priv->balloon.cb(cr, &priv->balloon.rect, priv->balloon.data);
+     }
+     cairo_destroy(cr);
+ }
+ /* return true if balloon is being displayed and if */
+ /* the given coordinate is within this balloon */
+ static gboolean
+ osd_balloon_check(osm_gps_map_osd_t *osd, gboolean down, gint x, gint y)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     if(!priv->balloon.surface)
+         return FALSE;
+     gint xs, ys;
+     osm_gps_map_geographic_to_screen (OSM_GPS_MAP(osd->widget),
+                                       priv->balloon.lat, priv->balloon.lon,
+                                       &xs, &ys);
+     xs += priv->balloon.rect.x + priv->balloon.offset_x;
+     ys += priv->balloon.rect.y + priv->balloon.offset_y;
+     gboolean is_in =
+         (x > xs) && (x < xs + priv->balloon.rect.w) &&
+         (y > ys) && (y < ys + priv->balloon.rect.h);
+     /* handle the fact that the balloon may have been created by the */
+     /* button down event */
+     if(!is_in && !down && !priv->balloon.just_created) {
+         /* the user actually clicked outside the balloon */
+         /* close the balloon! */
+         osm_gps_map_osd_clear_balloon (OSM_GPS_MAP(osd->widget));
+     }
+     return is_in;
+ }
+ void osm_gps_map_osd_clear_balloon (OsmGpsMap *map) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
-     gpointer priv;
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
- } osm_gps_map_osd_t;
+     g_return_if_fail (osd);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
+     if(priv->balloon.surface) {
+         cairo_surface_destroy(priv->balloon.surface);
+         priv->balloon.surface = NULL;
+         priv->balloon.lat = OSM_GPS_MAP_INVALID;
+         priv->balloon.lon = OSM_GPS_MAP_INVALID;
+     }
+     osm_gps_map_redraw(map);
+ }
+ void
+ osm_gps_map_osd_draw_balloon (OsmGpsMap *map, float latitude, float longitude,
+                               OsmGpsMapBalloonCallback cb, gpointer data) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_if_fail (osd);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
+     osm_gps_map_osd_clear_balloon (map);
+     /* allocate balloon surface */
+     priv->balloon.surface =
+         cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                    BALLOON_W+2, BALLOON_H+2);
+     priv->balloon.lat = latitude;
+     priv->balloon.lon = longitude;
+     priv->balloon.cb = cb;
+     priv->balloon.data = data;
+     priv->balloon.just_created = TRUE;
+     priv->balloon.orientation = -1;
+     osd_render_balloon(osd);
+     osm_gps_map_redraw(map);
+ }
+ #endif // OSD_BALLOON
  /* position and extent of bounding box */
+ #ifndef OSD_X
  #define OSD_X      (10)
- #define OSD_Y      (10)
+ #endif
- #define OSD_COLOR            0.5, 0.5, 1
+ #ifndef OSD_Y
- #define OSD_COLOR_DISABLED   0.8, 0.8, 0.8
+ #define OSD_Y      (10)
+ #endif
  /* parameters of the direction shape */
- #ifndef OSM_GPS_MAP_OSD_DIAMETER
+ #ifndef OSD_DIAMETER
  #define D_RAD  (30)         // diameter of dpad
  #else
- #define D_RAD  (OSM_GPS_MAP_OSD_DIAMETER)
+ #define D_RAD  (OSD_DIAMETER)
  #endif
  #define D_TIP  (4*D_RAD/5)  // distance of arrow tip from dpad center
  #define D_LEN  (D_RAD/4)    // length of arrow
-Line 59 
 typedef struct {
+Line 388 
 typedef struct {
  #define Z_STEP   (D_RAD/4)  // distance between dpad and zoom
  #define Z_RAD    (D_RAD/2)  // radius of "caps" of zoom bar
+ #ifdef OSD_SHADOW_ENABLE
  /* shadow also depends on control size */
  #define OSD_SHADOW (D_RAD/6)
+ #else
+ #define OSD_SHADOW (0)
+ #endif
+ /* normally the GPS button is in the center of the dpad. if there's */
+ /* no dpad it will go into the zoom area */
+ #if defined(OSD_GPS_BUTTON) && defined(OSD_NO_DPAD)
+ #define Z_GPS  1
+ #else
+ #define Z_GPS  0
+ #endif
  /* total width and height of controls incl. shadow */
- #define OSD_W    (2*D_RAD + OSD_SHADOW)
+ #define OSD_W    (2*D_RAD + OSD_SHADOW + Z_GPS * 2 * Z_RAD)
+ #if !Z_GPS
  #define OSD_H    (2*D_RAD + Z_STEP + 2*Z_RAD + OSD_SHADOW)
+ #else
+ #define OSD_H    (2*Z_RAD + OSD_SHADOW)
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
  #define OSD_LBL_SHADOW (OSD_SHADOW/2)
+ #endif
+ #define Z_TOP    ((1-Z_GPS) * (2 * D_RAD + Z_STEP))
- #define Z_TOP    (2 * D_RAD + Z_STEP)
  #define Z_MID    (Z_TOP + Z_RAD)
  #define Z_BOT    (Z_MID + Z_RAD)
  #define Z_LEFT   (Z_RAD)
- #define Z_RIGHT  (2 * D_RAD - Z_RAD)
+ #define Z_RIGHT  (2 * D_RAD - Z_RAD + Z_GPS * 2 * Z_RAD)
+ #define Z_CENTER ((Z_RIGHT + Z_LEFT)/2)
  /* create the cairo shape used for the zoom buttons */
  static void
- osm_gps_map_osd_zoom_shape(cairo_t *cr, gint x, gint y) {
+ osd_zoom_shape(cairo_t *cr, gint x, gint y)
+ {
      cairo_move_to (cr, x+Z_LEFT,    y+Z_TOP);
      cairo_line_to (cr, x+Z_RIGHT,   y+Z_TOP);
      cairo_arc     (cr, x+Z_RIGHT,   y+Z_MID, Z_RAD, -M_PI/2,  M_PI/2);
-Line 84 
 osm_gps_map_osd_zoom_shape(cairo_t *cr,
+Line 434 
 osm_gps_map_osd_zoom_shape(cairo_t *cr,
      cairo_arc     (cr, x+Z_LEFT,    y+Z_MID, Z_RAD,  M_PI/2, -M_PI/2);
  }
+ /* ------------------- color/shadow functions ----------------- */
+ #ifndef OSD_COLOR
+ /* if no color has been specified we just use the gdks default colors */
+ static void
+ osd_labels(cairo_t *cr, gint width, gboolean enabled,
+                        GdkColor *fg, GdkColor *disabled) {
+     if(enabled)  gdk_cairo_set_source_color(cr, fg);
+     else         gdk_cairo_set_source_color(cr, disabled);
+     cairo_set_line_width (cr, width);
+ }
+ #else
+ static void
+ osd_labels(cairo_t *cr, gint width, gboolean enabled) {
+     if(enabled)  cairo_set_source_rgb (cr, OSD_COLOR);
+     else         cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
+     cairo_set_line_width (cr, width);
+ }
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
+ static void
+ osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
+     cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
+     cairo_set_line_width (cr, width);
+ }
+ #endif
+ #ifndef OSD_NO_DPAD
  /* create the cairo shape used for the dpad */
  static void
- osm_gps_map_osd_dpad_shape(cairo_t *cr, gint x, gint y) {
+ osd_dpad_shape(cairo_t *cr, gint x, gint y)
+ {
      cairo_arc (cr, x+D_RAD, y+D_RAD, D_RAD, 0, 2 * M_PI);
  }
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
+ static void
+ osd_shape_shadow(cairo_t *cr) {
+     cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
+     cairo_fill (cr);
+     cairo_stroke (cr);
+ }
+ #endif
+ #ifndef OSD_COLOR
+ /* if no color has been specified we just use the gdks default colors */
+ static void
+ osd_shape(cairo_t *cr, GdkColor *bg, GdkColor *fg) {
+     gdk_cairo_set_source_color(cr, bg);
+     cairo_fill_preserve (cr);
+     gdk_cairo_set_source_color(cr, fg);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+ }
+ #else
+ static void
+ osd_shape(cairo_t *cr) {
+     cairo_set_source_rgb (cr, OSD_COLOR_BG);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgb (cr, OSD_COLOR);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
+ }
+ #endif
- typedef enum {
-     OSD_NONE = 0,
-     OSD_BG,
-     OSD_UP,
-     OSD_DOWN,
-     OSD_LEFT,
-     OSD_RIGHT,
-     OSD_IN,
-     OSD_OUT,
-     OSD_GPS
- } osd_button_t;
  static gboolean
  osm_gps_map_in_circle(gint x, gint y, gint cx, gint cy, gint rad)
-Line 108 
 osm_gps_map_in_circle(gint x, gint y, gi
+Line 508 
 osm_gps_map_in_circle(gint x, gint y, gi
      return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
  }
+ #ifndef OSD_NO_DPAD
  /* check whether x/y is within the dpad */
  static osd_button_t
- osm_gps_map_osd_check_dpad(gint x, gint y)
+ osd_check_dpad(gint x, gint y)
  {
      /* within entire dpad circle */
-     if( osm_gps_map_in_circle(x, y, OSD_X + D_RAD, OSD_Y + D_RAD, D_RAD))
+     if( osm_gps_map_in_circle(x, y, D_RAD, D_RAD, D_RAD))
      {
          /* convert into position relative to dpads centre */
-         x -= (OSD_X + D_RAD);
+         x -= D_RAD;
-         y -= (OSD_Y + D_RAD);
+         y -= D_RAD;
+ #ifdef OSD_GPS_BUTTON
          /* check for dpad center goes here! */
          if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3))
              return OSD_GPS;
+ #endif
          if( y < 0 && abs(x) < abs(y))
              return OSD_UP;
-Line 139 
 osm_gps_map_osd_check_dpad(gint x, gint
+Line 542 
 osm_gps_map_osd_check_dpad(gint x, gint
      }
      return OSD_NONE;
  }
+ #endif
  /* check whether x/y is within the zoom pads */
  static osd_button_t
- osm_gps_map_osd_check_zoom(gint x, gint y) {
+ osd_check_zoom(gint x, gint y) {
-     if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_Y+Z_BOT)) {
+     if( x > 0 && x < OSD_W && y > Z_TOP && y < Z_BOT) {
          /* within circle around (-) label */
-         if( osm_gps_map_in_circle(x, y, OSD_X + Z_LEFT, OSD_Y + Z_MID, Z_RAD))
+         if( osm_gps_map_in_circle(x, y, Z_LEFT, Z_MID, Z_RAD))
-             return OSD_OUT;
-         /* between center of (-) button and center of entire zoom control area */
-         if(x > OSD_LEFT && x < OSD_X + D_RAD)
              return OSD_OUT;
          /* within circle around (+) label */
-         if( osm_gps_map_in_circle(x, y, OSD_X + Z_RIGHT, OSD_Y + Z_MID, Z_RAD))
+         if( osm_gps_map_in_circle(x, y, Z_RIGHT, Z_MID, Z_RAD))
              return OSD_IN;
+ #if Z_GPS == 1
+         /* within square around center */
+         if( x > Z_CENTER - Z_RAD && x < Z_CENTER + Z_RAD)
+             return OSD_GPS;
+ #endif
+         /* between center of (-) button and center of entire zoom control area */
+         if(x > OSD_LEFT && x < D_RAD)
+             return OSD_OUT;
          /* between center of (+) button and center of entire zoom control area */
-         if(x < OSD_RIGHT && x > OSD_X + D_RAD)
+         if(x < OSD_RIGHT && x > D_RAD)
              return OSD_IN;
      }
      return OSD_NONE;
  }
- static osd_button_t
+ #ifdef OSD_SOURCE_SEL
- osm_gps_map_osd_check(gint x, gint y) {
-     osd_button_t but = OSD_NONE;
-     /* first do a rough test for the OSD area. */
+ /* place source selection at right border */
-     /* this is just to avoid an unnecessary detailed test */
+ #define OSD_S_RAD (Z_RAD)
-     if(x > OSD_X && x < OSD_X + OSD_W &&
+ #define OSD_S_X   (-OSD_X)
-        y > OSD_Y && y < OSD_Y + OSD_H) {
+ #define OSD_S_Y   (OSD_Y)
-         but = osm_gps_map_osd_check_dpad(x, y);
+ #define OSD_S_PW  (2 * Z_RAD)
+ #define OSD_S_W   (OSD_S_PW)
+ #define OSD_S_PH  (2 * Z_RAD)
+ #define OSD_S_H   (OSD_S_PH + OSD_SHADOW)
+ /* size of usable area when expanded */
+ #define OSD_S_AREA_W (priv->source_sel.width)
+ #define OSD_S_AREA_H (priv->source_sel.height)
+ #define OSD_S_EXP_W  (OSD_S_PW + OSD_S_AREA_W + OSD_SHADOW)
+ #define OSD_S_EXP_H  (OSD_S_AREA_H + OSD_SHADOW)
+ /* internal value to draw the arrow on the "puller" */
+ #define OSD_S_D0  (OSD_S_RAD/2)
+ #ifndef OSD_FONT_SIZE
+ #define OSD_FONT_SIZE 16.0
+ #endif
+ #define OSD_TEXT_BORDER   (OSD_FONT_SIZE/2)
+ #define OSD_TEXT_SKIP     (OSD_FONT_SIZE/8)
-         if(but == OSD_NONE)
+ /* draw the shape of the source selection OSD, either only the puller (not expanded) */
-             but = osm_gps_map_osd_check_zoom(x, y);
+ /* or the entire menu incl. the puller (expanded) */
+ static void
+ osd_source_shape(osd_priv_t *priv, cairo_t *cr, gint x, gint y) {
+     if(!priv->source_sel.expanded) {
+         /* just draw the puller */
+         cairo_move_to (cr, x + OSD_S_PW, y + OSD_S_PH);
+         cairo_arc (cr, x+OSD_S_RAD, y+OSD_S_RAD, OSD_S_RAD, M_PI/2, -M_PI/2);
+         cairo_line_to (cr, x + OSD_S_PW, y);
+     } else {
+         /* draw the puller and the area itself */
+         cairo_move_to (cr, x + OSD_S_PW + OSD_S_AREA_W, y + OSD_S_AREA_H);
+         cairo_line_to (cr, x + OSD_S_PW, y + OSD_S_AREA_H);
+         if(OSD_S_Y > 0) {
+             cairo_line_to (cr, x + OSD_S_PW, y + OSD_S_PH);
+             cairo_arc (cr, x+OSD_S_RAD, y+OSD_S_RAD, OSD_S_RAD, M_PI/2, -M_PI/2);
+         } else {
+             cairo_arc (cr, x+OSD_S_RAD, y+OSD_S_AREA_H-OSD_S_RAD, OSD_S_RAD, M_PI/2, -M_PI/2);
+             cairo_line_to (cr, x + OSD_S_PW, y + OSD_S_AREA_H - OSD_S_PH);
+             cairo_line_to (cr, x + OSD_S_PW, y);
+         }
+         cairo_line_to (cr, x + OSD_S_PW + OSD_S_AREA_W, y);
+         cairo_close_path (cr);
      }
+ }
-     return but;
+ static void
+ osd_source_content(osm_gps_map_osd_t *osd, cairo_t *cr, gint offset) {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     int py = offset + OSD_S_RAD - OSD_S_D0;
+     if(!priv->source_sel.expanded) {
+         /* draw the "puller" open (<) arrow */
+         cairo_move_to (cr, offset + OSD_S_RAD + OSD_S_D0/2, py);
+         cairo_rel_line_to (cr, -OSD_S_D0, +OSD_S_D0);
+         cairo_rel_line_to (cr, +OSD_S_D0, +OSD_S_D0);
+     } else {
+         if(OSD_S_Y < 0)
+             py += OSD_S_AREA_H - OSD_S_PH;
+         /* draw the "puller" close (>) arrow */
+         cairo_move_to (cr, offset + OSD_S_RAD - OSD_S_D0/2, py);
+         cairo_rel_line_to (cr, +OSD_S_D0, +OSD_S_D0);
+         cairo_rel_line_to (cr, -OSD_S_D0, +OSD_S_D0);
+         cairo_stroke(cr);
+         /* don't draw a shadow for the text content */
+         if(offset == 1) {
+             gint source;
+             g_object_get(osd->widget, "map-source", &source, NULL);
+             cairo_select_font_face (cr, "Sans",
+                                     CAIRO_FONT_SLANT_NORMAL,
+                                     CAIRO_FONT_WEIGHT_BOLD);
+             cairo_set_font_size (cr, OSD_FONT_SIZE);
+             int i, step = (priv->source_sel.height - 2*OSD_TEXT_BORDER) /
+                 OSM_GPS_MAP_SOURCE_LAST;
+             for(i=OSM_GPS_MAP_SOURCE_NULL+1;i<=OSM_GPS_MAP_SOURCE_LAST;i++) {
+                 cairo_text_extents_t extents;
+                 const char *src = osm_gps_map_source_get_friendly_name(i);
+                 cairo_text_extents (cr, src, &extents);
+                 int x = offset + OSD_S_PW + OSD_TEXT_BORDER;
+                 int y = offset + step * (i-1) + OSD_TEXT_BORDER;
+                 /* draw filled rectangle if selected */
+                 if(source == i) {
+                     cairo_rectangle(cr, x - OSD_TEXT_BORDER/2,
+                                     y - OSD_TEXT_SKIP,
+                                     priv->source_sel.width - OSD_TEXT_BORDER,
+                                     step + OSD_TEXT_SKIP);
+                     cairo_fill(cr);
+                     /* temprarily draw with background color */
+ #ifndef OSD_COLOR
+                     GdkColor bg = osd->widget->style->bg[GTK_STATE_NORMAL];
+                     gdk_cairo_set_source_color(cr, &bg);
+ #else
+                     cairo_set_source_rgb (cr, OSD_COLOR_BG);
+ #endif
+                 }
+                 cairo_move_to (cr, x, y + OSD_TEXT_SKIP - extents.y_bearing);
+                 cairo_show_text (cr, src);
+                 /* restore color */
+                 if(source == i) {
+ #ifndef OSD_COLOR
+                     GdkColor fg = osd->widget->style->fg[GTK_STATE_NORMAL];
+                     gdk_cairo_set_source_color(cr, &fg);
+ #else
+                     cairo_set_source_rgb (cr, OSD_COLOR);
+ #endif
+                 }
+             }
+         }
+     }
  }
  static void
- osm_gps_map_osd_shape_shadow(cairo_t *cr) {
+ osd_render_source_sel(osm_gps_map_osd_t *osd, gboolean force_rerender) {
-     cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     cairo_fill (cr);
+     if(priv->source_sel.rendered && !force_rerender)
+         return;
+     priv->source_sel.rendered = TRUE;
+ #ifndef OSD_COLOR
+     GdkColor bg = GTK_WIDGET(osd->widget)->style->bg[GTK_STATE_NORMAL];
+     GdkColor fg = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_NORMAL];
+     GdkColor da = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_INSENSITIVE];
+ #endif
+     /* draw source selector */
+     cairo_t *cr = cairo_create(priv->source_sel.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+ #ifdef OSD_SHADOW_ENABLE
+     osd_source_shape(priv, cr, 1+OSD_SHADOW, 1+OSD_SHADOW);
+     osd_shape_shadow(cr);
+ #endif
+     osd_source_shape(priv, cr, 1, 1);
+ #ifndef OSD_COLOR
+     osd_shape(cr, &bg, &fg);
+ #else
+     osd_shape(cr);
+ #endif
+ #ifdef OSD_SHADOW_ENABLE
+     osd_labels_shadow(cr, Z_RAD/3, TRUE);
+     osd_source_content(osd, cr, 1+OSD_LBL_SHADOW);
      cairo_stroke (cr);
+ #endif
+ #ifndef OSD_COLOR
+     osd_labels(cr, Z_RAD/3, TRUE, &fg, &da);
+ #else
+     osd_labels(cr, Z_RAD/3, TRUE);
+ #endif
+     osd_source_content(osd, cr, 1);
+     cairo_stroke (cr);
+     cairo_destroy(cr);
  }
- static void
+ /* re-allocate the buffer used to draw the menu. This is used */
- osm_gps_map_osd_shape(cairo_t *cr) {
+ /* to collapse/expand the buffer */
-     cairo_set_source_rgb (cr, 1, 1, 1);
+ static void
-     cairo_fill_preserve (cr);
+ osd_source_reallocate(osm_gps_map_osd_t *osd) {
-     cairo_set_source_rgb (cr, OSD_COLOR);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     cairo_set_line_width (cr, 1);
-     cairo_stroke (cr);
+     /* re-allocate offscreen bitmap */
+     g_assert (priv->source_sel.surface);
+     int w = OSD_S_W, h = OSD_S_H;
+     if(priv->source_sel.expanded) {
+         cairo_text_extents_t extents;
+         /* determine content size */
+         cairo_t *cr = cairo_create(priv->source_sel.surface);
+         cairo_select_font_face (cr, "Sans",
+                                 CAIRO_FONT_SLANT_NORMAL,
+                                 CAIRO_FONT_WEIGHT_BOLD);
+         cairo_set_font_size (cr, OSD_FONT_SIZE);
+         /* calculate menu size */
+         int i, max_h = 0, max_w = 0;
+         for(i=OSM_GPS_MAP_SOURCE_NULL+1;i<=OSM_GPS_MAP_SOURCE_LAST;i++) {
+             const char *src = osm_gps_map_source_get_friendly_name(i);
+             cairo_text_extents (cr, src, &extents);
+             if(extents.width > max_w) max_w = extents.width;
+             if(extents.height > max_h) max_h = extents.height;
+         }
+         cairo_destroy(cr);
+         priv->source_sel.width  = max_w + 2*OSD_TEXT_BORDER;
+         priv->source_sel.height = OSM_GPS_MAP_SOURCE_LAST *
+             (max_h + 2*OSD_TEXT_SKIP) + 2*OSD_TEXT_BORDER;
+         w = OSD_S_EXP_W;
+         h = OSD_S_EXP_H;
+     }
+     cairo_surface_destroy(priv->source_sel.surface);
+     priv->source_sel.surface =
+         cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w+2, h+2);
+     osd_render_source_sel(osd, TRUE);
+ }
+ #define OSD_HZ      15
+ #define OSD_TIME    500
+ static gboolean osd_source_animate(gpointer data) {
+     osm_gps_map_osd_t *osd = (osm_gps_map_osd_t*)data;
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     int diff = OSD_S_EXP_W - OSD_S_W - OSD_S_X;
+     gboolean done = FALSE;
+     priv->source_sel.count += priv->source_sel.dir;
+     /* shifting in */
+     if(priv->source_sel.dir < 0) {
+         if(priv->source_sel.count <= 0) {
+             priv->source_sel.count = 0;
+             done = TRUE;
+         }
+     } else {
+         if(priv->source_sel.count >= 1000) {
+             priv->source_sel.expanded = FALSE;
+             osd_source_reallocate(osd);
+             priv->source_sel.count = 1000;
+             done = TRUE;
+         }
+     }
+     /* count runs linearly from 0 to 1000, map this nicely onto a position */
+     /* nice sinoid mapping */
+     float m = 0.5-cos(priv->source_sel.count * M_PI / 1000.0)/2;
+     priv->source_sel.shift =
+         (osd->widget->allocation.width - OSD_S_EXP_W + OSD_S_X) +
+         m * diff;
+     /* make sure the screen is updated */
+     osm_gps_map_repaint(OSM_GPS_MAP(osd->widget));
+     /* stop animation if done */
+     if(done)
+         priv->source_sel.handler_id = 0;
+     return !done;
  }
+ /* switch between expand and collapse mode of source selection */
  static void
- osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
+ osd_source_toggle(osm_gps_map_osd_t *osd)
+ {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     /* ignore clicks while animation is running */
+     if(priv->source_sel.handler_id)
+         return;
+     /* expand immediately, collapse is handle at the end of the */
+     /* collapse animation */
+     if(!priv->source_sel.expanded) {
+         priv->source_sel.expanded = TRUE;
+         osd_source_reallocate(osd);
+         priv->source_sel.count = 1000;
+         priv->source_sel.shift = osd->widget->allocation.width - OSD_S_W;
+         priv->source_sel.dir = -1000/OSD_HZ;
+     } else {
+         priv->source_sel.count =  0;
+         priv->source_sel.shift = osd->widget->allocation.width -
+             OSD_S_EXP_W + OSD_S_X;
+         priv->source_sel.dir = +1000/OSD_HZ;
+     }
+     /* start timer to handle animation */
+     priv->source_sel.handler_id = gtk_timeout_add(OSD_TIME/OSD_HZ,
+                                                   osd_source_animate, osd);
+ }
+ /* check if the user clicked inside the source selection area */
+ static osd_button_t
+ osd_source_check(osm_gps_map_osd_t *osd, gboolean down, gint x, gint y) {
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     if(!priv->source_sel.expanded)
+         x -= osd->widget->allocation.width - OSD_S_W;
+     else
+         x -= osd->widget->allocation.width - OSD_S_EXP_W + OSD_S_X;
+     if(OSD_S_Y > 0)
+         y -= OSD_S_Y;
+     else
+         y -= osd->widget->allocation.height - OSD_S_PH + OSD_S_Y;
+     /* within square around puller? */
+     if(y > 0 && y < OSD_S_PH && x > 0 && x < OSD_S_PW) {
+         /* really within puller shape? */
+         if(x > Z_RAD || osm_gps_map_in_circle(x, y, Z_RAD, Z_RAD, Z_RAD)) {
+             /* expand source selector */
+             if(down)
+                 osd_source_toggle(osd);
+             /* tell upper layers that user clicked some background element */
+             /* of the OSD */
+             return OSD_BG;
+         }
+     }
+     /* check for clicks into data area */
+     if(priv->source_sel.expanded && !priv->source_sel.handler_id) {
+         /* re-adjust from puller top to content top */
+         if(OSD_S_Y < 0)
+             y += OSD_S_EXP_H - OSD_S_PH;
+         if(x > OSD_S_PW &&
+            x < OSD_S_PW + OSD_S_EXP_W &&
+            y > 0 &&
+            y < OSD_S_EXP_H) {
+             int step = (priv->source_sel.height - 2*OSD_TEXT_BORDER)
+                 / OSM_GPS_MAP_SOURCE_LAST;
+             y -= OSD_TEXT_BORDER - OSD_TEXT_SKIP;
+             y /= step;
+             y += 1;
+             if(down) {
+                 gint old = 0;
+                 g_object_get(osd->widget, "map-source", &old, NULL);
+                 if(y > OSM_GPS_MAP_SOURCE_NULL &&
+                    y <= OSM_GPS_MAP_SOURCE_LAST &&
+                    old != y) {
+                     g_object_set(osd->widget, "map-source", y, NULL);
+                     osd_render_source_sel(osd, TRUE);
+                     osm_gps_map_repaint(OSM_GPS_MAP(osd->widget));
+                 }
+             }
+             /* return "clicked in OSD background" to prevent further */
+             /* processing by application */
+             return OSD_BG;
+         }
+     }
+     return OSD_NONE;
+ }
+ #endif // OSD_SOURCE_SEL
+ static osd_button_t
+ osd_check(osm_gps_map_osd_t *osd, gboolean down, gint x, gint y) {
+     osd_button_t but = OSD_NONE;
+ #ifdef OSD_BALLOON
+     if(down) {
+         /* needed to handle balloons that are created at click */
+         osd_priv_t *priv = (osd_priv_t*)osd->priv;
+         priv->balloon.just_created = FALSE;
+     }
+ #endif
+ #ifdef OSD_SOURCE_SEL
+     /* the source selection area is handles internally */
+     but = osd_source_check(osd, down, x, y);
+ #endif
+     if(but == OSD_NONE) {
+         gint mx = x - OSD_X;
+         gint my = y - OSD_Y;
+         if(OSD_X < 0)
+             mx -= (osd->widget->allocation.width - OSD_W);
+         if(OSD_Y < 0)
+             my -= (osd->widget->allocation.height - OSD_H);
+         /* first do a rough test for the OSD area. */
+         /* this is just to avoid an unnecessary detailed test */
+         if(mx > 0 && mx < OSD_W && my > 0 && my < OSD_H) {
+ #ifndef OSD_NO_DPAD
+             but = osd_check_dpad(mx, my);
+ #endif
+         }
+         if(but == OSD_NONE)
+             but = osd_check_zoom(mx, my);
+     }
+ #ifdef OSD_BALLOON
+     if(but == OSD_NONE) {
+         /* check if user clicked into balloon */
+         if(osd_balloon_check(osd, down, x, y))
+             but = OSD_BG;
+     }
+ #endif
+     return but;
+ }
+ #ifndef OSD_NO_DPAD
+ static void
+ osd_dpad_labels(cairo_t *cr, gint x, gint y) {
      /* move reference to dpad center */
      x += D_RAD;
      y += D_RAD;
-Line 222 
 osm_gps_map_osd_dpad_labels(cairo_t *cr,
+Line 1019 
 osm_gps_map_osd_dpad_labels(cairo_t *cr,
          cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
      }
  }
+ #endif
- /* draw the sattelite dish icon in the center of the dpad */
+ #ifdef OSD_GPS_BUTTON
- #define GPS_V0  (D_RAD/8)
+ /* draw the satellite dish icon in the center of the dpad */
+ #define GPS_V0  (D_RAD/7)
  #define GPS_V1  (D_RAD/10)
  #define GPS_V2  (D_RAD/5)
  /* draw a satellite receiver dish */
+ /* this is either drawn in the center of the dpad (if present) */
+ /* or in the middle of the zoom area */
  static void
- osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
+ osd_dpad_gps(cairo_t *cr, gint x, gint y) {
      /* move reference to dpad center */
-     x += D_RAD;
+     x += (1-Z_GPS) * D_RAD + Z_GPS * Z_RAD * 3;
-     y += D_RAD + GPS_V0;
+     y += (1-Z_GPS) * D_RAD + Z_GPS * Z_RAD + GPS_V0;
      cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
      cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
-Line 248 
 osm_gps_map_osd_dpad_gps(cairo_t *cr, gi
+Line 1049 
 osm_gps_map_osd_dpad_gps(cairo_t *cr, gi
      cairo_move_to (cr, x, y-GPS_V2);
      cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
  }
+ #endif
  #define Z_LEN  (2*Z_RAD/3)
  static void
- osm_gps_map_osd_zoom_labels(cairo_t *cr, gint x, gint y) {
+ osd_zoom_labels(cairo_t *cr, gint x, gint y) {
      cairo_move_to (cr, x + Z_LEFT  - Z_LEN, y + Z_MID);
      cairo_line_to (cr, x + Z_LEFT  + Z_LEN, y + Z_MID);
-Line 262 
 osm_gps_map_osd_zoom_labels(cairo_t *cr,
+Line 1064 
 osm_gps_map_osd_zoom_labels(cairo_t *cr,
      cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
  }
- static void
+ #ifdef OSD_COORDINATES
- osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled) {
-     if(enabled)  cairo_set_source_rgb (cr, OSD_COLOR);
-     else         cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
-     cairo_set_line_width (cr, width);
-     cairo_stroke (cr);
- }
- static void
- osm_gps_map_osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
-     cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
-     cairo_set_line_width (cr, width);
-     cairo_stroke (cr);
- }
- static void
- osm_gps_map_osd_render(OsmGpsMapPrivate *priv) {
-     /* first fill with transparency */
+ #ifndef OSD_COORDINATES_FONT_SIZE
-     cairo_t *cr = cairo_create(priv->osd.overlay);
+ #define OSD_COORDINATES_FONT_SIZE 12
-     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
-     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
-     cairo_paint(cr);
-     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-     /* --------- draw zoom and dpad shape shadow ----------- */
-     gint x = 0, y = 0;
-     osm_gps_map_osd_zoom_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
-     osm_gps_map_osd_shape_shadow(cr);
-     osm_gps_map_osd_dpad_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
-     osm_gps_map_osd_shape_shadow(cr);
-     /* --------- draw zoom and dpad shape ----------- */
-     osm_gps_map_osd_zoom_shape(cr, x, y);
-     osm_gps_map_osd_shape(cr);
-     osm_gps_map_osd_dpad_shape(cr, x, y);
-     osm_gps_map_osd_shape(cr);
-     /* --------- draw zoom and dpad labels --------- */
-     osm_gps_map_osd_zoom_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
-     osm_gps_map_osd_dpad_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
-     osm_gps_map_osd_labels_shadow(cr, Z_RAD/3, TRUE);
-     osm_gps_map_osd_dpad_gps(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
-     osm_gps_map_osd_labels_shadow(cr, Z_RAD/6, priv->osd.cb != NULL);
-     osm_gps_map_osd_zoom_labels(cr, x, y);
-     osm_gps_map_osd_dpad_labels(cr, x, y);
-     osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
-     osm_gps_map_osd_dpad_gps(cr, x, y);
-     osm_gps_map_osd_labels(cr, Z_RAD/6, priv->osd.cb != NULL);
-     cairo_destroy(cr);
- }
- static void
- osm_gps_map_osd_draw_controls (OsmGpsMap *map, gint xoffset, gint yoffset)
- {
-     OsmGpsMapPrivate *priv = map->priv;
-     /* backup previous contents */
-     if(!priv->osd.backup)
-         priv->osd.backup = gdk_pixmap_new(priv->pixmap, OSD_W+2, OSD_H+2, -1);
-     gint x = OSD_X + EXTRA_BORDER + xoffset;
-     gint y = OSD_Y + EXTRA_BORDER + yoffset;
-     /* create backup of background */
-     gdk_draw_drawable(priv->osd.backup,
-         GTK_WIDGET(map)->style->fg_gc[GTK_WIDGET_STATE(GTK_WIDGET(map))],
-                       priv->pixmap, x-1, y-1, 0, 0, OSD_W+2, OSD_H+2);
-     priv->osd.backup_x = x-1;
-     priv->osd.backup_y = y-1;
- #ifdef USE_CAIRO
-     /* OSD itself uses some off-screen rendering, so check if the */
-     /* offscreen buffer is present and create it if not */
-     if(!priv->osd.overlay) {
-         /* create overlay ... */
-         priv->osd.overlay =
-             cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
-         /* ... and render it */
-         osm_gps_map_osd_render(priv);
-     }
-     // now draw this onto the original context
-     cairo_t *cr = gdk_cairo_create(priv->pixmap);
-     cairo_set_source_surface(cr, priv->osd.overlay, x, y);
-     cairo_paint(cr);
-     cairo_destroy(cr);
- #else
- #warning "OSD control display lacks a non-cairo implementation!"
  #endif
- }
- static void
+ #define OSD_COORDINATES_OFFSET (OSD_COORDINATES_FONT_SIZE/6)
- osm_gps_map_osd_restore (OsmGpsMap *map)
- {
-     OsmGpsMapPrivate *priv = map->priv;
-     /* restore backup of previous contents */
+ #define OSD_COORDINATES_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)
-     if(priv->osd.backup) {
+ #define OSD_COORDINATES_H  (2*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET+OSD_COORDINATES_FONT_SIZE/4)
-         /* create backup of background */
-         gdk_draw_drawable(priv->pixmap,
-             GTK_WIDGET(map)->style->fg_gc[GTK_WIDGET_STATE(GTK_WIDGET(map))],
-                       priv->osd.backup, 0, 0,
-                       priv->osd.backup_x, priv->osd.backup_y, OSD_W+2, OSD_H+2);
-     }
- }
+ /* these can be overwritten with versions that support */
+ /* localization */
+ #ifndef OSD_COORDINATES_CHR_N
+ #define OSD_COORDINATES_CHR_N  "N"
  #endif
+ #ifndef OSD_COORDINATES_CHR_S
- static gboolean
+ #define OSD_COORDINATES_CHR_S  "S"
- osm_gps_map_map_redraw (OsmGpsMap *map)
- {
-     OsmGpsMapPrivate *priv = map->priv;
-     priv->idle_map_redraw = 0;
-     /* the motion_notify handler uses priv->pixmap to redraw the area; if we
-      * change it while we are dragging, we will end up showing it in the wrong
-      * place. This could be fixed by carefully recompute the coordinates, but
-      * for now it's easier just to disable redrawing the map while dragging */
-     if (priv->dragging)
-         return FALSE;
-     priv->redraw_cycle++;
-     /* draw white background to initialise pixmap */
-     gdk_draw_rectangle (
-                         priv->pixmap,
-                         GTK_WIDGET(map)->style->white_gc,
-                         TRUE,
-, 0,
-                         GTK_WIDGET(map)->allocation.width + EXTRA_BORDER * 2,
-                         GTK_WIDGET(map)->allocation.height + EXTRA_BORDER * 2);
-     osm_gps_map_fill_tiles_pixel(map);
-     osm_gps_map_print_tracks(map);
-     osm_gps_map_draw_gps_point(map);
-     osm_gps_map_print_images(map);
- #ifdef ENABLE_BALLOON
-     osm_gps_map_draw_balloon_int(map);
- #endif
- #ifdef ENABLE_OSD
-     osm_gps_map_osd_draw_controls(map, 0, 0);
- #endif
-     //osm_gps_map_osd_speed(map, 1.5);
-     osm_gps_map_purge_cache(map);
-     gtk_widget_queue_draw (GTK_WIDGET (map));
-     return FALSE;
- }
- static void
- osm_gps_map_map_redraw_idle (OsmGpsMap *map)
- {
-     OsmGpsMapPrivate *priv = map->priv;
-     if (priv->idle_map_redraw == 0)
-         priv->idle_map_redraw = g_idle_add ((GSourceFunc)osm_gps_map_map_redraw, map);
- }
- static void
- osm_gps_map_init (OsmGpsMap *object)
- {
-     OsmGpsMapPrivate *priv;
-     priv = G_TYPE_INSTANCE_GET_PRIVATE (object, OSM_TYPE_GPS_MAP, OsmGpsMapPrivate);
-     object->priv = priv;
-     priv->pixmap = NULL;
-     priv->trip_history = NULL;
-     priv->gps = g_new0(coord_t, 1);
-     priv->gps_valid = FALSE;
- #ifdef ENABLE_BALLOON
-     priv->balloon.coo = g_new0(coord_t, 1);
-     priv->balloon.valid = FALSE;
-     priv->balloon.cb = NULL;
  #endif
+ #ifndef OSD_COORDINATES_CHR_E
- #ifdef ENABLE_OSD
+ #define OSD_COORDINATES_CHR_E  "E"
-     priv->osd.backup = NULL;
-     priv->osd.overlay = NULL;
-     priv->osd.cb = NULL;
  #endif
+ #ifndef OSD_COORDINATES_CHR_W
-     priv->tracks = NULL;
+ #define OSD_COORDINATES_CHR_W  "W"
-     priv->images = NULL;
-     priv->drag_counter = 0;
-     priv->drag_mouse_dx = 0;
-     priv->drag_mouse_dy = 0;
-     priv->drag_start_mouse_x = 0;
-     priv->drag_start_mouse_y = 0;
-     priv->uri_format = 0;
-     priv->the_google = FALSE;
-     priv->map_source = -1;
- #ifndef LIBSOUP22
-     //Change naumber of concurrent connections option?
-     priv->soup_session = soup_session_async_new_with_options(
-                                                              SOUP_SESSION_USER_AGENT,
-                                                              "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11",
-                                                              NULL);
- #else
-     /* libsoup-2.2 seems not to be able to set the user agent */
-     priv->soup_session = soup_session_async_new();
  #endif
-     //Hash table which maps tile d/l URIs to SoupMessage requests
-     priv->tile_queue = g_hash_table_new (g_str_hash, g_str_equal);
-     //Some mapping providers (Google) have varying degrees of tiles at multiple
-     //zoom levels
-     priv->missing_tiles = g_hash_table_new (g_str_hash, g_str_equal);
-     /* memory cache for most recently used tiles */
-     priv->tile_cache = g_hash_table_new_full (g_str_hash, g_str_equal,
-                                               g_free, (GDestroyNotify)cached_tile_free);
-     priv->max_tile_cache_size = 20;
-     gtk_widget_add_events (GTK_WIDGET (object),
-                            GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
-                            GDK_POINTER_MOTION_MASK |
-                            GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK);
-     GTK_WIDGET_SET_FLAGS (object, GTK_CAN_FOCUS);
-     g_log_set_handler (G_LOG_DOMAIN, G_LOG_LEVEL_MASK, my_log_handler, NULL);
- }
- #ifndef G_CHECKSUM_MD5
- /* simple hash algorithm hack if md5 is not present */
- static char *simple_hash(char *str) {
-     union {
-         char str[4];
-         gulong val;
-     } hash = { .val = 0x55555555 };
-     while(*str) {
-         hash.str[(int)str & 3] ^= *str;
-         str++;
-     }
-     return g_strdup_printf("%08lX", hash.val);
- }
- #endif
- static GObject *
+ /* this is the classic geocaching notation */
- osm_gps_map_constructor (GType gtype, guint n_properties, GObjectConstructParam *properties)
+ static char
- {
+ *osd_latitude_str(float latitude) {
-     GObject *object;
+     char *c = OSD_COORDINATES_CHR_N;
-     OsmGpsMapPrivate *priv;
+     float integral, fractional;
-     OsmGpsMap *map;
-     const char *uri;
+     if(isnan(latitude))
+         return NULL;
-     //Always chain up to the parent constructor
-     object = G_OBJECT_CLASS(osm_gps_map_parent_class)->constructor(gtype, n_properties, properties);
+     if(latitude < 0) {
-     map = OSM_GPS_MAP(object);
+         latitude = fabs(latitude);
-     priv = OSM_GPS_MAP_PRIVATE(object);
+         c = OSD_COORDINATES_CHR_S;
-     //user can specify a map source ID, or a repo URI as the map source
-     uri = osm_gps_map_source_get_repo_uri(OSM_GPS_MAP_SOURCE_NULL);
-     if ( (priv->map_source == 0) || (strcmp(priv->repo_uri, uri) == 0) ) {
-         g_debug("Using null source");
-         priv->map_source = OSM_GPS_MAP_SOURCE_NULL;
-         priv->null_tile = gdk_pixbuf_new(GDK_COLORSPACE_RGB, FALSE, 8, 256, 256);
-         gdk_pixbuf_fill(priv->null_tile, 0xcccccc00);
-     }
-     else if (priv->map_source >= 0) {
-         //check if the source given is valid
-         uri = osm_gps_map_source_get_repo_uri(priv->map_source);
-         if (uri) {
-             g_debug("Setting map source from ID");
-             g_free(priv->repo_uri);
-             priv->repo_uri = g_strdup(uri);
-             priv->image_format = g_strdup(
-                 osm_gps_map_source_get_image_format(priv->map_source));
-             priv->max_zoom = osm_gps_map_source_get_max_zoom(priv->map_source);
-             priv->min_zoom = osm_gps_map_source_get_min_zoom(priv->map_source);
-         }
      }
-     if (!priv->cache_dir_is_full_path) {
+     fractional = modff(latitude, &integral);
- #ifdef G_CHECKSUM_MD5
-         char *md5 = g_compute_checksum_for_string (G_CHECKSUM_MD5, priv->repo_uri, -1);
+     return g_strdup_printf("%s %02d° %06.3f'",
- #else
+                            c, (int)integral, fractional*60.0);
-         char *md5 = simple_hash(priv->repo_uri);
+ }
- #endif
-         if (priv->cache_dir) {
-             char *old = priv->cache_dir;
-             //the new cachedir is the given cache dir + the md5 of the repo_uri
-             priv->cache_dir = g_strdup_printf("%s%c%s", old, G_DIR_SEPARATOR, md5);
-             g_debug("Adjusting cache dir %s -> %s", old, priv->cache_dir);
-             g_free(old);
-         } else {
-             //the new cachedir is the current dir + the md5 of the repo_uri
-             priv->cache_dir = g_strdup(md5);
-         }
-         g_free(md5);
+ static char
+ *osd_longitude_str(float longitude) {
+     char *c = OSD_COORDINATES_CHR_E;
+     float integral, fractional;
+     if(isnan(longitude))
+         return NULL;
+     if(longitude < 0) {
+         longitude = fabs(longitude);
+         c = OSD_COORDINATES_CHR_W;
      }
-     inspect_map_uri(map);
+     fractional = modff(longitude, &integral);
-     return object;
+     return g_strdup_printf("%s %03d° %06.3f'",
+                            c, (int)integral, fractional*60.0);
  }
- static void
+ /* render a string at the given screen position */
- osm_gps_map_dispose (GObject *object)
+ static int
- {
+ osd_render_centered_text(cairo_t *cr, int y, int width, char *text) {
-     OsmGpsMap *map = OSM_GPS_MAP(object);
+     char *p = g_strdup(text);
-     OsmGpsMapPrivate *priv = map->priv;
+     cairo_text_extents_t extents;
+     cairo_text_extents (cr, p, &extents);
-     if (priv->is_disposed)
-         return;
+     /* check if text needs to be truncated */
+     int len = strlen(text)-2;
-     priv->is_disposed = TRUE;
+     while(extents.width > width) {
+         len--;
-     soup_session_abort(priv->soup_session);
+         strcpy(p+len, "...");
-     g_object_unref(priv->soup_session);
+         cairo_text_extents (cr, p, &extents);
+     }
-     g_hash_table_destroy(priv->tile_queue);
-     g_hash_table_destroy(priv->missing_tiles);
+     cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
-     g_hash_table_destroy(priv->tile_cache);
+     cairo_set_line_width (cr, OSD_COORDINATES_FONT_SIZE/6);
+     cairo_move_to (cr, (width - extents.width)/2, y - extents.y_bearing);
-     osm_gps_map_free_images(map);
+     cairo_text_path (cr, p);
+     cairo_stroke (cr);
-     if(priv->pixmap)
-         g_object_unref (priv->pixmap);
-     if (priv->null_tile)
-         g_object_unref (priv->null_tile);
-     if(priv->gc_map)
-         g_object_unref(priv->gc_map);
-     if (priv->idle_map_redraw != 0)
-         g_source_remove (priv->idle_map_redraw);
-     g_free(priv->gps);
- #ifdef ENABLE_BALLOON
+     cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
-     g_free(priv->balloon.coo);
+     cairo_move_to (cr, (width - extents.width)/2, y - extents.y_bearing);
- #endif
+     cairo_show_text (cr, p);
- #ifdef ENABLE_OSD
+     g_free(p);
-     if (priv->osd.backup)
-         g_object_unref(priv->osd.backup);
-     if (priv->osd.overlay)
+     /* skip + 1/4 line */
-          cairo_surface_destroy(priv->osd.overlay);
+     return y + 5*OSD_COORDINATES_FONT_SIZE/4;
- #endif
-     G_OBJECT_CLASS (osm_gps_map_parent_class)->dispose (object);
  }
  static void
- osm_gps_map_finalize (GObject *object)
+ osd_render_coordinates(osm_gps_map_osd_t *osd)
  {
-     OsmGpsMap *map = OSM_GPS_MAP(object);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     OsmGpsMapPrivate *priv = map->priv;
-     g_free(priv->cache_dir);
-     g_free(priv->repo_uri);
-     g_free(priv->image_format);
-     osm_gps_map_free_trip(map);
+     /* get current map position */
-     osm_gps_map_free_tracks(map);
+     gfloat lat, lon;
+     g_object_get(osd->widget, "latitude", &lat, "longitude", &lon, NULL);
+     /* check if position has changed enough to require redraw */
+     if(!isnan(priv->coordinates.lat) && !isnan(priv->coordinates.lon))
+         /* 1/60000 == 1/1000 minute */
+         if((fabsf(lat - priv->coordinates.lat) < 1/60000) &&
+            (fabsf(lon - priv->coordinates.lon) < 1/60000))
+             return;
-     G_OBJECT_CLASS (osm_gps_map_parent_class)->finalize (object);
+     priv->coordinates.lat = lat;
- }
+     priv->coordinates.lon = lon;
- static void
+     /* first fill with transparency */
- osm_gps_map_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
+     cairo_t *cr = cairo_create(priv->coordinates.surface);
- {
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
-     g_return_if_fail (OSM_IS_GPS_MAP (object));
+     //    cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 0.5);
-     OsmGpsMap *map = OSM_GPS_MAP(object);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 0.0);
-     OsmGpsMapPrivate *priv = map->priv;
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-     switch (prop_id)
+     cairo_select_font_face (cr, "Sans",
-     {
+                             CAIRO_FONT_SLANT_NORMAL,
-         case PROP_AUTO_CENTER:
+                             CAIRO_FONT_WEIGHT_BOLD);
-             priv->map_auto_center = g_value_get_boolean (value);
+     cairo_set_font_size (cr, OSD_COORDINATES_FONT_SIZE);
-             break;
-         case PROP_RECORD_TRIP_HISTORY:
-             priv->record_trip_history = g_value_get_boolean (value);
-             break;
-         case PROP_SHOW_TRIP_HISTORY:
-             priv->show_trip_history = g_value_get_boolean (value);
-             break;
-         case PROP_AUTO_DOWNLOAD:
-             priv->map_auto_download = g_value_get_boolean (value);
-             break;
-         case PROP_REPO_URI:
-             priv->repo_uri = g_value_dup_string (value);
-             break;
-         case PROP_PROXY_URI:
-             if ( g_value_get_string(value) ) {
-                 priv->proxy_uri = g_value_dup_string (value);
-                 g_debug("Setting proxy server: %s", priv->proxy_uri);
- #ifndef LIBSOUP22
-                 GValue val = {0};
-                 SoupURI* uri = soup_uri_new(priv->proxy_uri);
-                 g_value_init(&val, SOUP_TYPE_URI);
-                 g_value_take_boxed(&val, uri);
-                 g_object_set_property(G_OBJECT(priv->soup_session),SOUP_SESSION_PROXY_URI,&val);
+     char *latitude = osd_latitude_str(lat);
- #else
+     char *longitude = osd_longitude_str(lon);
-                 SoupUri* uri = soup_uri_new(priv->proxy_uri);
-                 g_object_set(G_OBJECT(priv->soup_session), SOUP_SESSION_PROXY_URI, uri, NULL);
+     int y = OSD_COORDINATES_OFFSET;
- #endif
+     y = osd_render_centered_text(cr, y, OSD_COORDINATES_W, latitude);
-             } else
+     y = osd_render_centered_text(cr, y, OSD_COORDINATES_W, longitude);
-                 priv->proxy_uri = NULL;
+     g_free(latitude);
+     g_free(longitude);
-             break;
+     cairo_destroy(cr);
-         case PROP_TILE_CACHE_DIR:
-             if ( g_value_get_string(value) )
-                 priv->cache_dir = g_value_dup_string (value);
-             break;
-         case PROP_TILE_CACHE_DIR_IS_FULL_PATH:
-             priv->cache_dir_is_full_path = g_value_get_boolean (value);
-             break;
-         case PROP_ZOOM:
-             priv->map_zoom = g_value_get_int (value);
-             break;
-         case PROP_MAX_ZOOM:
-             priv->max_zoom = g_value_get_int (value);
-             break;
-         case PROP_MIN_ZOOM:
-             priv->min_zoom = g_value_get_int (value);
-             break;
-         case PROP_MAP_X:
-             priv->map_x = g_value_get_int (value);
-             priv->center_coord_set = FALSE;
-             break;
-         case PROP_MAP_Y:
-             priv->map_y = g_value_get_int (value);
-             priv->center_coord_set = FALSE;
-             break;
-         case PROP_GPS_TRACK_WIDTH:
-             priv->ui_gps_track_width = g_value_get_int (value);
-             break;
-         case PROP_GPS_POINT_R1:
-             priv->ui_gps_point_inner_radius = g_value_get_int (value);
-             break;
-         case PROP_GPS_POINT_R2:
-             priv->ui_gps_point_outer_radius = g_value_get_int (value);
-             break;
-         case PROP_MAP_SOURCE:
-             priv->map_source = g_value_get_int (value);
-             break;
-         case PROP_IMAGE_FORMAT:
-             priv->image_format = g_value_dup_string (value);
-             break;
-         default:
-             G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-             break;
-     }
  }
+ #endif  // OSD_COORDINATES
- static void
+ #ifdef OSD_NAV
- osm_gps_map_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
+ #define OSD_NAV_W  (8*OSD_COORDINATES_FONT_SIZE+2*OSD_COORDINATES_OFFSET)
- {
+ #define OSD_NAV_H  (11*OSD_COORDINATES_FONT_SIZE)
-     g_return_if_fail (OSM_IS_GPS_MAP (object));
-     float lat,lon;
-     OsmGpsMap *map = OSM_GPS_MAP(object);
-     OsmGpsMapPrivate *priv = map->priv;
-     switch (prop_id)
+ /* http://mathforum.org/library/drmath/view/55417.html */
-     {
+ static float get_bearing(float lat1, float lon1, float lat2, float lon2) {
-         case PROP_AUTO_CENTER:
+   return atan2( sin(lon2 - lon1) * cos(lat2),
-             g_value_set_boolean(value, priv->map_auto_center);
+                 cos(lat1) * sin(lat2) -
-             break;
+                 sin(lat1) * cos(lat2) * cos(lon2 - lon1));
-         case PROP_RECORD_TRIP_HISTORY:
-             g_value_set_boolean(value, priv->record_trip_history);
-             break;
-         case PROP_SHOW_TRIP_HISTORY:
-             g_value_set_boolean(value, priv->show_trip_history);
-             break;
-         case PROP_AUTO_DOWNLOAD:
-             g_value_set_boolean(value, priv->map_auto_download);
-             break;
-         case PROP_REPO_URI:
-             g_value_set_string(value, priv->repo_uri);
-             break;
-         case PROP_PROXY_URI:
-             g_value_set_string(value, priv->proxy_uri);
-             break;
-         case PROP_TILE_CACHE_DIR:
-             g_value_set_string(value, priv->cache_dir);
-             break;
-         case PROP_TILE_CACHE_DIR_IS_FULL_PATH:
-             g_value_set_boolean(value, priv->cache_dir_is_full_path);
-             break;
-         case PROP_ZOOM:
-             g_value_set_int(value, priv->map_zoom);
-             break;
-         case PROP_MAX_ZOOM:
-             g_value_set_int(value, priv->max_zoom);
-             break;
-         case PROP_MIN_ZOOM:
-             g_value_set_int(value, priv->min_zoom);
-             break;
-         case PROP_LATITUDE:
-             lat = pixel2lat(priv->map_zoom,
-                             priv->map_y + (GTK_WIDGET(map)->allocation.height / 2));
-             g_value_set_float(value, rad2deg(lat));
-             break;
-         case PROP_LONGITUDE:
-             lon = pixel2lon(priv->map_zoom,
-                             priv->map_x + (GTK_WIDGET(map)->allocation.width / 2));
-             g_value_set_float(value, rad2deg(lon));
-             break;
-         case PROP_MAP_X:
-             g_value_set_int(value, priv->map_x);
-             break;
-         case PROP_MAP_Y:
-             g_value_set_int(value, priv->map_y);
-             break;
-         case PROP_TILES_QUEUED:
-             g_value_set_int(value, g_hash_table_size(priv->tile_queue));
-             break;
-         case PROP_GPS_TRACK_WIDTH:
-             g_value_set_int(value, priv->ui_gps_track_width);
-             break;
-         case PROP_GPS_POINT_R1:
-             g_value_set_int(value, priv->ui_gps_point_inner_radius);
-             break;
-         case PROP_GPS_POINT_R2:
-             g_value_set_int(value, priv->ui_gps_point_outer_radius);
-             break;
-         case PROP_MAP_SOURCE:
-             g_value_set_int(value, priv->map_source);
-             break;
-         case PROP_IMAGE_FORMAT:
-             g_value_set_string(value, priv->image_format);
-             break;
-         default:
-             G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-             break;
-     }
  }
- static gboolean
+ /* http://mathforum.org/library/drmath/view/51722.html */
- osm_gps_map_scroll_event (GtkWidget *widget, GdkEventScroll  *event)
+ static float get_distance(float lat1, float lon1, float lat2, float lon2) {
- {
+   float aob = acos(cos(lat1) * cos(lat2) * cos(lon2 - lon1) +
-     OsmGpsMap *map = OSM_GPS_MAP(widget);
+                    sin(lat1) * sin(lat2));
-     OsmGpsMapPrivate *priv = map->priv;
-     if (event->direction == GDK_SCROLL_UP)
+   //  return(aob * 3959.0);   /* great circle radius in miles */
-     {
-         osm_gps_map_set_zoom(map, priv->map_zoom+1);
-     }
-     else
-     {
-         osm_gps_map_set_zoom(map, priv->map_zoom-1);
-     }
-     return FALSE;
+   return(aob * 6371000.0);     /* great circle radius in meters */
  }
- static gboolean
+ static void
- osm_gps_map_button_press (GtkWidget *widget, GdkEventButton *event)
+ osd_render_nav(osm_gps_map_osd_t *osd)
  {
-     OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
- #ifdef ENABLE_BALLOON
-     /* don't drag if the user clicked within the balloon */
-     if (osm_gps_map_in_balloon(priv,
-                    event->x + EXTRA_BORDER,
-                    event->y + EXTRA_BORDER))
-     {
-         priv->drag_counter = -1;
-         return FALSE;
-     }
- #endif
- #ifdef ENABLE_OSD
+     if(!priv->nav.surface || isnan(priv->nav.lat) || isnan(priv->nav.lon))
-     #define SCROLL_STEP 10
+         return;
-     /* pressed inside OSD control? */
-     osd_button_t but = osm_gps_map_osd_check(event->x, event->y);
-     if(but != OSD_NONE)
-     {
-         priv->drag_counter = -1;
-         switch(but) {
-         case OSD_GPS:
-             priv->osd.cb(priv->osd.data);
-             break;
-         case OSD_UP:
-             priv->map_y -= GTK_WIDGET(widget)->allocation.height/SCROLL_STEP;
-             priv->center_coord_set = FALSE;
-             break;
-         case OSD_DOWN:
-             priv->map_y += GTK_WIDGET(widget)->allocation.height/SCROLL_STEP;
-             priv->center_coord_set = FALSE;
-             break;
-         case OSD_LEFT:
-             priv->map_x -= GTK_WIDGET(widget)->allocation.width/SCROLL_STEP;
-             priv->center_coord_set = FALSE;
-             break;
-         case OSD_RIGHT:
-             priv->map_x += GTK_WIDGET(widget)->allocation.width/SCROLL_STEP;
-             priv->center_coord_set = FALSE;
-             break;
-         case OSD_IN:
-             osm_gps_map_set_zoom(OSM_GPS_MAP(widget), priv->map_zoom+1);
-             break;
-         case OSD_OUT:
-             osm_gps_map_set_zoom(OSM_GPS_MAP(widget), priv->map_zoom-1);
-             break;
-         default:
-             break;
-         }
-         osm_gps_map_map_redraw_idle(OSM_GPS_MAP(widget));
-         return FALSE;
-     }
- #endif
-     priv->drag_counter = 0;
+     /* first fill with transparency */
-     priv->drag_start_mouse_x = (int) event->x;
+     cairo_t *cr = cairo_create(priv->nav.surface);
-     priv->drag_start_mouse_y = (int) event->y;
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
-     priv->drag_start_map_x = priv->map_x;
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
-     priv->drag_start_map_y = priv->map_y;
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-     return FALSE;
+     cairo_select_font_face (cr, "Sans",
- }
+                             CAIRO_FONT_SLANT_NORMAL,
+                             CAIRO_FONT_WEIGHT_BOLD);
+     cairo_set_font_size (cr, OSD_COORDINATES_FONT_SIZE);
- static gboolean
+     char *latitude = osd_latitude_str(priv->nav.lat);
- osm_gps_map_button_release (GtkWidget *widget, GdkEventButton *event)
+     char *longitude = osd_longitude_str(priv->nav.lon);
- {
-     OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);
+     int y = OSD_COORDINATES_OFFSET;
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, priv->nav.name);
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, latitude);
+     y = osd_render_centered_text(cr, y, OSD_NAV_W, longitude);
+     g_free(latitude);
+     g_free(longitude);
- #ifdef ENABLE_BALLOON
+     /* draw the compass */
-     /* released inside the balloon? */
+     int radius = (OSD_NAV_H - y - 5*OSD_COORDINATES_FONT_SIZE/4)/2;
-     if (osm_gps_map_in_balloon(priv,
+     if(radius > OSD_NAV_W/2)
-                    event->x + EXTRA_BORDER,
+         radius = OSD_NAV_W/2;
-                    event->y + EXTRA_BORDER))
-     {
-         osm_gps_map_handle_balloon_click(OSM_GPS_MAP(widget),
-              event->x - priv->balloon.rect.x + EXTRA_BORDER,
-              event->y - priv->balloon.rect.y + EXTRA_BORDER);
-     }
- #endif
-     if (priv->dragging)
+     int x = OSD_NAV_W/2+1;
-     {
+     y += radius;
-         priv->dragging = FALSE;
-         priv->map_x = priv->drag_start_map_x;
+     cairo_stroke (cr);
-         priv->map_y = priv->drag_start_map_y;
-         priv->map_x += (priv->drag_start_mouse_x - (int) event->x);
+     /* draw background */
-         priv->map_y += (priv->drag_start_mouse_y - (int) event->y);
+     cairo_arc(cr, x, y, radius, 0,  2*M_PI);
+     cairo_set_source_rgba (cr, 1, 1, 1, 0.5);
+     cairo_fill_preserve (cr);
+     cairo_set_source_rgb (cr, 0, 0, 0);
+     cairo_set_line_width (cr, 1);
+     cairo_stroke (cr);
-         priv->center_coord_set = FALSE;
+     /* draw pointer */
+ #define ARROW_WIDTH     0.3
+ #define ARROW_LENGTH    0.7
+     coord_t *gps = osm_gps_map_get_gps (OSM_GPS_MAP(osd->widget));
+     if(gps) {
+         float arot = get_bearing(gps->rlat, gps->rlon,
+                      deg2rad(priv->nav.lat), deg2rad(priv->nav.lon));
+         cairo_move_to(cr,
+                       x + radius *  ARROW_LENGTH *  sin(arot),
+                       y + radius *  ARROW_LENGTH * -cos(arot));
+         cairo_line_to(cr,
+                       x + radius * -ARROW_LENGTH *  sin(arot+ARROW_WIDTH),
+                       y + radius * -ARROW_LENGTH * -cos(arot+ARROW_WIDTH));
+         cairo_line_to(cr,
+                       x + radius * -0.5 * ARROW_LENGTH *  sin(arot),
+                       y + radius * -0.5 * ARROW_LENGTH * -cos(arot));
+         cairo_line_to(cr,
+                       x + radius * -ARROW_LENGTH *  sin(arot-ARROW_WIDTH),
+                       y + radius * -ARROW_LENGTH * -cos(arot-ARROW_WIDTH));
+         cairo_close_path(cr);
+         cairo_set_source_rgb (cr, 0, 0, 0);
+         cairo_fill (cr);
+         y += radius + OSD_COORDINATES_FONT_SIZE/4;
+         float dist = get_distance(gps->rlat, gps->rlon,
+                         deg2rad(priv->nav.lat), deg2rad(priv->nav.lon));
+         char *dist_str = NULL;
+         if(!priv->nav.imperial) {
+             /* metric is easy ... */
+             if(dist<1000)
+                 dist_str = g_strdup_printf("%u m", (int)dist);
+             else
+                 dist_str = g_strdup_printf("%.1f km", dist/1000);
+         } else {
+             /* and now the hard part: scale for useful imperial values :-( */
+             /* try to convert to feet, 1ft == 0.3048 m */
-         osm_gps_map_map_redraw_idle(OSM_GPS_MAP(widget));
+             if(dist/(3*0.3048) >= 1760.0)      /* more than 1760 yard? */
+                 dist_str = g_strdup_printf("%.1f mi", dist/(0.3048*3*1760.0));
+             else if(dist/0.3048 >= 100)        /* more than 100 feet? */
+                 dist_str = g_strdup_printf("%.1f yd", dist/(0.3048*3));
+             else
+                 dist_str = g_strdup_printf("%.0f ft", dist/0.3048);
+         }
+         y = osd_render_centered_text(cr, y, OSD_NAV_W, dist_str);
+         g_free(dist_str);
      }
-     priv->drag_mouse_dx = 0;
+     cairo_destroy(cr);
-     priv->drag_mouse_dy = 0;
-     priv->drag_counter = -1;
-     return FALSE;
  }
- static gboolean
+ void osm_gps_map_osd_clear_nav (OsmGpsMap *map) {
- osm_gps_map_expose (GtkWidget *widget, GdkEventExpose  *event);
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
- static gboolean
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
- osm_gps_map_motion_notify (GtkWidget *widget, GdkEventMotion  *event)
+     g_return_if_fail (osd);
- {
-     int x, y;
-     GdkModifierType state;
-     OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);
-     if (event->is_hint)
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-         gdk_window_get_pointer (event->window, &x, &y, &state);
+     g_return_if_fail (priv);
-     else
-     {
+     if(priv->nav.surface) {
-         x = event->x;
+         cairo_surface_destroy(priv->nav.surface);
-         y = event->y;
+         priv->nav.surface = NULL;
-         state = event->state;
+         priv->nav.lat = OSM_GPS_MAP_INVALID;
+         priv->nav.lon = OSM_GPS_MAP_INVALID;
+         if(priv->nav.name) g_free(priv->nav.name);
      }
+     osm_gps_map_redraw(map);
+ }
-     // are we being dragged
+ void
-     if (!(state & GDK_BUTTON1_MASK))
+ osm_gps_map_osd_draw_nav (OsmGpsMap *map, gboolean imperial,
-         return FALSE;
+                           float latitude, float longitude, char *name) {
+     g_return_if_fail (OSM_IS_GPS_MAP (map));
-     if (priv->drag_counter < 0)
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
-         return FALSE;
+     g_return_if_fail (osd);
-     priv->drag_counter++;
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
+     g_return_if_fail (priv);
-     // we havent dragged more than 6 pixels
+     osm_gps_map_osd_clear_nav (map);
-     if (priv->drag_counter < 6)
-         return FALSE;
- #ifdef USE_MAEMO
+     /* allocate balloon surface */
-     /* reduce update frequency on maemo to keep screen update fluid */
+     priv->nav.surface =
-     static guint32 last_time = 0;
+         cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                    OSD_NAV_W+2, OSD_NAV_H+2);
-     if(event->time - last_time < 100) return FALSE;
+     priv->nav.lat = latitude;
-     last_time = event->time;
+     priv->nav.lon = longitude;
- #endif
+     priv->nav.name = g_strdup(name);
+     priv->nav.imperial = imperial;
+     osd_render_nav(osd);
-     priv->dragging = TRUE;
+     osm_gps_map_redraw(map);
+ }
-     if (priv->map_auto_center)
+ #endif // OSD_NAV
-         g_object_set(G_OBJECT(widget), "auto-center", FALSE, NULL);
-     priv->drag_mouse_dx = x - priv->drag_start_mouse_x;
-     priv->drag_mouse_dy = y - priv->drag_start_mouse_y;
- #ifdef ENABLE_OSD
+ #ifdef OSD_CROSSHAIR
-     /* undo OSD */
-     osm_gps_map_osd_restore (OSM_GPS_MAP(widget));
-     /* draw new OSD */
+ #ifndef OSD_CROSSHAIR_RADIUS
-     osm_gps_map_osd_draw_controls (OSM_GPS_MAP(widget),
+ #define OSD_CROSSHAIR_RADIUS 10
-                                    -priv->drag_mouse_dx,
-                                    -priv->drag_mouse_dy);
  #endif
-     osm_gps_map_expose (widget, NULL);
+ #define OSD_CROSSHAIR_TICK  (OSD_CROSSHAIR_RADIUS/2)
+ #define OSD_CROSSHAIR_BORDER (OSD_CROSSHAIR_TICK + OSD_CROSSHAIR_RADIUS/4)
+ #define OSD_CROSSHAIR_W  ((OSD_CROSSHAIR_RADIUS+OSD_CROSSHAIR_BORDER)*2)
+ #define OSD_CROSSHAIR_H  ((OSD_CROSSHAIR_RADIUS+OSD_CROSSHAIR_BORDER)*2)
+ static void
+ osd_render_crosshair_shape(cairo_t *cr) {
+     cairo_arc (cr, OSD_CROSSHAIR_W/2, OSD_CROSSHAIR_H/2,
+                OSD_CROSSHAIR_RADIUS, 0,  2*M_PI);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2 - OSD_CROSSHAIR_RADIUS,
+                    OSD_CROSSHAIR_H/2);
+     cairo_rel_line_to (cr, -OSD_CROSSHAIR_TICK, 0);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2 + OSD_CROSSHAIR_RADIUS,
+                    OSD_CROSSHAIR_H/2);
+     cairo_rel_line_to (cr,  OSD_CROSSHAIR_TICK, 0);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2,
+                    OSD_CROSSHAIR_H/2 - OSD_CROSSHAIR_RADIUS);
+     cairo_rel_line_to (cr, 0, -OSD_CROSSHAIR_TICK);
+     cairo_move_to (cr, OSD_CROSSHAIR_W/2,
+                    OSD_CROSSHAIR_H/2 + OSD_CROSSHAIR_RADIUS);
+     cairo_rel_line_to (cr, 0, OSD_CROSSHAIR_TICK);
-     return FALSE;
+     cairo_stroke (cr);
  }
- static gboolean
+ static void
- osm_gps_map_configure (GtkWidget *widget, GdkEventConfigure *event)
+ osd_render_crosshair(osm_gps_map_osd_t *osd)
  {
-     OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     /* create pixmap */
+     if(priv->crosshair.rendered)
-     if (priv->pixmap)
+         return;
-         g_object_unref (priv->pixmap);
-     priv->pixmap = gdk_pixmap_new (
-                                    widget->window,
-                                    widget->allocation.width + EXTRA_BORDER * 2,
-                                    widget->allocation.height + EXTRA_BORDER * 2,
-                                    -1);
-     /* and gc, used for clipping (I think......) */
+     priv->crosshair.rendered = TRUE;
-     if(priv->gc_map)
-         g_object_unref(priv->gc_map);
-     priv->gc_map = gdk_gc_new(priv->pixmap);
+     /* first fill with transparency */
+     cairo_t *cr = cairo_create(priv->crosshair.surface);
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-     osm_gps_map_map_redraw(OSM_GPS_MAP(widget));
+     cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
+     cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.5);
+     cairo_set_line_width (cr, OSD_CROSSHAIR_RADIUS/2);
+     osd_render_crosshair_shape(cr);
+     cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.5);
+     cairo_set_line_width (cr, OSD_CROSSHAIR_RADIUS/4);
+     osd_render_crosshair_shape(cr);
-     return FALSE;
+     cairo_destroy(cr);
  }
+ #endif
- static gboolean
+ #ifdef OSD_SCALE
- osm_gps_map_expose (GtkWidget *widget, GdkEventExpose  *event)
- {
-     OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);
-     gdk_draw_drawable (
+ #ifndef OSD_SCALE_FONT_SIZE
-                        widget->window,
+ #define OSD_SCALE_FONT_SIZE 12
-                        widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
-                        priv->pixmap,
-,0,
-                        priv->drag_mouse_dx - EXTRA_BORDER,
-                        priv->drag_mouse_dy - EXTRA_BORDER,
-                        -1,-1);
-     //Paint white outside of the map if dragging. Its less
-     //ugly than painting the corrupted map
-     if(priv->drag_mouse_dx>EXTRA_BORDER) {
-         gdk_draw_rectangle (
-                             widget->window,
-                             widget->style->white_gc,
-                             TRUE,
-, 0,
-                             priv->drag_mouse_dx - EXTRA_BORDER,
-                             widget->allocation.height);
-     }
-     else if (-priv->drag_mouse_dx > EXTRA_BORDER)
-     {
-         gdk_draw_rectangle (
-                             widget->window,
-                             widget->style->white_gc,
-                             TRUE,
-                             priv->drag_mouse_dx + widget->allocation.width + EXTRA_BORDER, 0,
-                             -priv->drag_mouse_dx - EXTRA_BORDER,
-                             widget->allocation.height);
-     }
-     if (priv->drag_mouse_dy>EXTRA_BORDER) {
-         gdk_draw_rectangle (
-                             widget->window,
-                             widget->style->white_gc,
-                             TRUE,
-, 0,
-                             widget->allocation.width,
-                             priv->drag_mouse_dy - EXTRA_BORDER);
-     }
-     else if (-priv->drag_mouse_dy > EXTRA_BORDER)
-     {
-         gdk_draw_rectangle (
-                             widget->window,
-                             widget->style->white_gc,
-                             TRUE,
-, priv->drag_mouse_dy + widget->allocation.height + EXTRA_BORDER,
-                             widget->allocation.width,
-                             -priv->drag_mouse_dy - EXTRA_BORDER);
-     }
- #if 0
-     if(!priv->dragging)
-         gdk_draw_drawable (
-                        widget->window,
-                        widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
-                        priv->pixmap,
-                        event->area.x + EXTRA_BORDER,
-                        event->area.y + EXTRA_BORDER,
-                        event->area.x, event->area.y,
-                        event->area.width, event->area.height);
  #endif
-     return FALSE;
+ #define OSD_SCALE_W   (10*OSD_SCALE_FONT_SIZE)
- }
+ #define OSD_SCALE_H   (5*OSD_SCALE_FONT_SIZE/2)
+ /* various parameters used to create the scale */
+ #define OSD_SCALE_H2   (OSD_SCALE_H/2)
+ #define OSD_SCALE_TICK (2*OSD_SCALE_FONT_SIZE/3)
+ #define OSD_SCALE_M    (OSD_SCALE_H2 - OSD_SCALE_TICK)
+ #define OSD_SCALE_I    (OSD_SCALE_H2 + OSD_SCALE_TICK)
+ #define OSD_SCALE_FD   (OSD_SCALE_FONT_SIZE/4)
  static void
- osm_gps_map_class_init (OsmGpsMapClass *klass)
+ osd_render_scale(osm_gps_map_osd_t *osd)
  {
-     GObjectClass* object_class = G_OBJECT_CLASS (klass);
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
-     g_type_class_add_private (klass, sizeof (OsmGpsMapPrivate));
+     /* this only needs to be rendered if the zoom has changed */
+     gint zoom;
+     g_object_get(OSM_GPS_MAP(osd->widget), "zoom", &zoom, NULL);
+     if(zoom == priv->scale.zoom)
+         return;
-     object_class->dispose = osm_gps_map_dispose;
+     priv->scale.zoom = zoom;
-     object_class->finalize = osm_gps_map_finalize;
-     object_class->constructor = osm_gps_map_constructor;
-     object_class->set_property = osm_gps_map_set_property;
-     object_class->get_property = osm_gps_map_get_property;
-     widget_class->expose_event = osm_gps_map_expose;
-     widget_class->configure_event = osm_gps_map_configure;
-     widget_class->button_press_event = osm_gps_map_button_press;
-     widget_class->button_release_event = osm_gps_map_button_release;
-     widget_class->motion_notify_event = osm_gps_map_motion_notify;
-     widget_class->scroll_event = osm_gps_map_scroll_event;
-     g_object_class_install_property (object_class,
-                                      PROP_AUTO_CENTER,
-                                      g_param_spec_boolean ("auto-center",
-                                                            "auto center",
-                                                            "map auto center",
-                                                            TRUE,
-                                                            G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_RECORD_TRIP_HISTORY,
-                                      g_param_spec_boolean ("record-trip-history",
-                                                            "record trip history",
-                                                            "should all gps points be recorded in a trip history",
-                                                            TRUE,
-                                                            G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_SHOW_TRIP_HISTORY,
-                                      g_param_spec_boolean ("show-trip-history",
-                                                            "show trip history",
-                                                            "should the recorded trip history be shown on the map",
-                                                            TRUE,
-                                                            G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_AUTO_DOWNLOAD,
-                                      g_param_spec_boolean ("auto-download",
-                                                            "auto download",
-                                                            "map auto download",
-                                                            TRUE,
-                                                            G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_REPO_URI,
-                                      g_param_spec_string ("repo-uri",
-                                                           "repo uri",
-                                                           "map source tile repository uri",
-                                                           OSM_REPO_URI,
-                                                           G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-      g_object_class_install_property (object_class,
-                                      PROP_PROXY_URI,
-                                      g_param_spec_string ("proxy-uri",
-                                                           "proxy uri",
-                                                           "http proxy uri on NULL",
-                                                           NULL,
-                                                           G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_TILE_CACHE_DIR,
-                                      g_param_spec_string ("tile-cache",
-                                                           "tile cache",
-                                                           "osm local tile cache dir",
-                                                           NULL,
-                                                           G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_TILE_CACHE_DIR_IS_FULL_PATH,
-                                      g_param_spec_boolean ("tile-cache-is-full-path",
-                                                            "tile cache is full path",
-                                                            "if true, the path passed to tile-cache is interpreted as the full cache path",
-                                                            FALSE,
-                                                            G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_ZOOM,
-                                      g_param_spec_int ("zoom",
-                                                        "zoom",
-                                                        "zoom level",
-                                                        MIN_ZOOM, /* minimum property value */
-                                                        MAX_ZOOM, /* maximum property value */
-,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_MAX_ZOOM,
-                                      g_param_spec_int ("max-zoom",
-                                                        "max zoom",
-                                                        "maximum zoom level",
-                                                        MIN_ZOOM, /* minimum property value */
-                                                        MAX_ZOOM, /* maximum property value */
-                                                        OSM_MAX_ZOOM,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_MIN_ZOOM,
-                                      g_param_spec_int ("min-zoom",
-                                                        "min zoom",
-                                                        "minimum zoom level",
-                                                        MIN_ZOOM, /* minimum property value */
-                                                        MAX_ZOOM, /* maximum property value */
-                                                        OSM_MIN_ZOOM,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_LATITUDE,
-                                      g_param_spec_float ("latitude",
-                                                          "latitude",
-                                                          "latitude in degrees",
-                                                          -90.0, /* minimum property value */
-.0, /* maximum property value */
-,
-                                                          G_PARAM_READABLE));
-     g_object_class_install_property (object_class,
-                                      PROP_LONGITUDE,
-                                      g_param_spec_float ("longitude",
-                                                          "longitude",
-                                                          "longitude in degrees",
-                                                          -180.0, /* minimum property value */
-.0, /* maximum property value */
-,
-                                                          G_PARAM_READABLE));
-     g_object_class_install_property (object_class,
-                                      PROP_MAP_X,
-                                      g_param_spec_int ("map-x",
-                                                        "map-x",
-                                                        "initial map x location",
-                                                        G_MININT, /* minimum property value */
-                                                        G_MAXINT, /* maximum property value */
-,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_MAP_Y,
-                                      g_param_spec_int ("map-y",
-                                                        "map-y",
-                                                        "initial map y location",
-                                                        G_MININT, /* minimum property value */
-                                                        G_MAXINT, /* maximum property value */
-,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_TILES_QUEUED,
-                                      g_param_spec_int ("tiles-queued",
-                                                        "tiles-queued",
-                                                        "number of tiles currently waiting to download",
-                                                        G_MININT, /* minimum property value */
-                                                        G_MAXINT, /* maximum property value */
-,
-                                                        G_PARAM_READABLE));
-     g_object_class_install_property (object_class,
-                                      PROP_GPS_TRACK_WIDTH,
-                                      g_param_spec_int ("gps-track-width",
-                                                        "gps-track-width",
-                                                        "width of the lines drawn for the gps track",
-,           /* minimum property value */
-                                                        G_MAXINT,    /* maximum property value */
-,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_GPS_POINT_R1,
-                                      g_param_spec_int ("gps-track-point-radius",
-                                                        "gps-track-point-radius",
-                                                        "radius of the gps point inner circle",
-,           /* minimum property value */
-                                                        G_MAXINT,    /* maximum property value */
-,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_GPS_POINT_R2,
-                                      g_param_spec_int ("gps-track-highlight-radius",
-                                                        "gps-track-highlight-radius",
-                                                        "radius of the gps point highlight circle",
-,           /* minimum property value */
-                                                        G_MAXINT,    /* maximum property value */
-,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT));
-     g_object_class_install_property (object_class,
-                                      PROP_MAP_SOURCE,
-                                      g_param_spec_int ("map-source",
-                                                        "map source",
-                                                        "map source ID",
-                                                        -1,           /* minimum property value */
-                                                        G_MAXINT,    /* maximum property value */
-                                                        -1,
-                                                        G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
-     g_object_class_install_property (object_class,
-                                      PROP_IMAGE_FORMAT,
-                                      g_param_spec_string ("image-format",
-                                                           "image format",
-                                                           "map source tile repository image format (jpg, png)",
-                                                           OSM_IMAGE_FORMAT,
-                                                           G_PARAM_READABLE | G_PARAM_WRITABLE | G_PARAM_CONSTRUCT_ONLY));
- }
- const char*
+     float m_per_pix = osm_gps_map_get_scale(OSM_GPS_MAP(osd->widget));
- osm_gps_map_source_get_friendly_name(OsmGpsMapSource_t source)
- {
-     switch(source)
-     {
-         case OSM_GPS_MAP_SOURCE_NULL:
-             return "None";
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP:
-             return "OpenStreetMap";
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP_RENDERER:
-             return "OpenStreetMap Renderer";
-         case OSM_GPS_MAP_SOURCE_OPENAERIALMAP:
-             return "OpenAerialMap";
-         case OSM_GPS_MAP_SOURCE_MAPS_FOR_FREE:
-             return "Maps-For-Free";
-         case OSM_GPS_MAP_SOURCE_GOOGLE_STREET:
-             return "Google Maps";
-         case OSM_GPS_MAP_SOURCE_GOOGLE_SATELLITE:
-             return "Google Satellite";
-         case OSM_GPS_MAP_SOURCE_GOOGLE_HYBRID:
-             return "Google Hybrid";
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_STREET:
-             return "Virtual Earth";
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_SATELLITE:
-             return "Virtual Earth Satellite";
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_HYBRID:
-             return "Virtual Earth Hybrid";
-         case OSM_GPS_MAP_SOURCE_YAHOO_STREET:
-             return "Yahoo Maps";
-         case OSM_GPS_MAP_SOURCE_YAHOO_SATELLITE:
-             return "Yahoo Satellite";
-         case OSM_GPS_MAP_SOURCE_YAHOO_HYBRID:
-             return "Yahoo Hybrid";
-         default:
-             return NULL;
-     }
-     return NULL;
- }
- //http://www.internettablettalk.com/forums/showthread.php?t=5209
- //https://garage.maemo.org/plugins/scmsvn/viewcvs.php/trunk/src/maps.c?root=maemo-mapper&view=markup
- //http://www.ponies.me.uk/maps/GoogleTileUtils.java
- //http://www.mgmaps.com/cache/MapTileCacher.perl
- const char*
- osm_gps_map_source_get_repo_uri(OsmGpsMapSource_t source)
- {
-     switch(source)
-     {
-         case OSM_GPS_MAP_SOURCE_NULL:
-             return "none://";
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP:
-             return OSM_REPO_URI;
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP_RENDERER:
-             return "http://tah.openstreetmap.org/Tiles/tile/#Z/#X/#Y.png";
-         case OSM_GPS_MAP_SOURCE_OPENAERIALMAP:
-             return "http://tile.openaerialmap.org/tiles/1.0.0/openaerialmap-900913/#Z/#X/#Y.jpg";
-         case OSM_GPS_MAP_SOURCE_MAPS_FOR_FREE:
-             return "http://maps-for-free.com/layer/relief/z#Z/row#Y/#Z_#X-#Y.jpg";
-         case OSM_GPS_MAP_SOURCE_GOOGLE_STREET:
-             return "http://mt#R.google.com/vt/v=w2.97&x=#X&y=#Y&z=#Z";
-         case OSM_GPS_MAP_SOURCE_GOOGLE_SATELLITE:
-             return "http://khm#R.google.com/kh?n=404&v=3&t=#Q";
-         case OSM_GPS_MAP_SOURCE_GOOGLE_HYBRID:
-             return NULL; /* No longer working  "http://mt#R.google.com/mt?n=404&v=w2t.99&x=#X&y=#Y&zoom=#S" */
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_STREET:
-             return "http://a#R.ortho.tiles.virtualearth.net/tiles/r#W.jpeg?g=50";
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_SATELLITE:
-             return "http://a#R.ortho.tiles.virtualearth.net/tiles/a#W.jpeg?g=50";
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_HYBRID:
-             return "http://a#R.ortho.tiles.virtualearth.net/tiles/h#W.jpeg?g=50";
-         case OSM_GPS_MAP_SOURCE_YAHOO_STREET:
-         case OSM_GPS_MAP_SOURCE_YAHOO_SATELLITE:
-         case OSM_GPS_MAP_SOURCE_YAHOO_HYBRID:
-             /* TODO: Implement signed Y, aka U
-              * http://us.maps3.yimg.com/aerial.maps.yimg.com/ximg?v=1.7&t=a&s=256&x=%d&y=%-d&z=%d
-              *  x = tilex,
-              *  y = (1 << (MAX_ZOOM - zoom)) - tiley - 1,
-              *  z = zoom - (MAX_ZOOM - 17));
-              */
-             return NULL;
-         default:
-             return NULL;
-     }
-     return NULL;
- }
- const char *
+     /* first fill with transparency */
- osm_gps_map_source_get_image_format(OsmGpsMapSource_t source)
+     cairo_t *cr = cairo_create(priv->scale.surface);
- {
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
-     switch(source) {
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
-         case OSM_GPS_MAP_SOURCE_NULL:
+     // pink for testing:    cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.2);
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP:
+     cairo_paint(cr);
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP_RENDERER:
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
-             return "png";
-         case OSM_GPS_MAP_SOURCE_OPENAERIALMAP:
+     /* determine the size of the scale width in meters */
-         case OSM_GPS_MAP_SOURCE_GOOGLE_STREET:
+     float width = (OSD_SCALE_W-OSD_SCALE_FONT_SIZE/6) * m_per_pix;
-         case OSM_GPS_MAP_SOURCE_GOOGLE_HYBRID:
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_STREET:
+     /* scale this to useful values */
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_SATELLITE:
+     int exp = logf(width)*M_LOG10E;
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_HYBRID:
+     int mant = width/pow(10,exp);
-         case OSM_GPS_MAP_SOURCE_YAHOO_STREET:
+     int width_metric = mant * pow(10,exp);
-         case OSM_GPS_MAP_SOURCE_YAHOO_SATELLITE:
+     char *dist_str = NULL;
-         case OSM_GPS_MAP_SOURCE_YAHOO_HYBRID:
+     if(width_metric<1000)
-         case OSM_GPS_MAP_SOURCE_MAPS_FOR_FREE:
+         dist_str = g_strdup_printf("%u m", width_metric);
-         case OSM_GPS_MAP_SOURCE_GOOGLE_SATELLITE:
+     else
-             return "jpg";
+         dist_str = g_strdup_printf("%u km", width_metric/1000);
-         default:
+     width_metric /= m_per_pix;
-             return "bin";
+     /* and now the hard part: scale for useful imperial values :-( */
+     /* try to convert to feet, 1ft == 0.3048 m */
+     width /= 0.3048;
+     float imp_scale = 0.3048;
+     char *dist_imp_unit = "ft";
+     if(width >= 100) {
+         /* 1yd == 3 feet */
+         width /= 3.0;
+         imp_scale *= 3.0;
+         dist_imp_unit = "yd";
+         if(width >= 1760.0) {
+             /* 1mi == 1760 yd */
+             width /= 1760.0;
+             imp_scale *= 1760.0;
+             dist_imp_unit = "mi";
+         }
      }
-     return "bin";
- }
+     /* also convert this to full tens/hundreds */
+     exp = logf(width)*M_LOG10E;
+     mant = width/pow(10,exp);
+     int width_imp = mant * pow(10,exp);
+     char *dist_str_imp = g_strdup_printf("%u %s", width_imp, dist_imp_unit);
+     /* convert back to pixels */
+     width_imp *= imp_scale;
+     width_imp /= m_per_pix;
+     cairo_select_font_face (cr, "Sans",
+                             CAIRO_FONT_SLANT_NORMAL,
+                             CAIRO_FONT_WEIGHT_BOLD);
+     cairo_set_font_size (cr, OSD_SCALE_FONT_SIZE);
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
+     cairo_text_extents_t extents;
+     cairo_text_extents (cr, dist_str, &extents);
+     cairo_set_source_rgb(cr, 1.0, 1.0, 1.0);
+     cairo_set_line_width (cr, OSD_SCALE_FONT_SIZE/6);
+     cairo_move_to (cr, 2*OSD_SCALE_FD, OSD_SCALE_H2-OSD_SCALE_FD);
+     cairo_text_path (cr, dist_str);
+     cairo_stroke (cr);
+     cairo_move_to (cr, 2*OSD_SCALE_FD,
+                    OSD_SCALE_H2+OSD_SCALE_FD + extents.height);
+     cairo_text_path (cr, dist_str_imp);
+     cairo_stroke (cr);
- int
+     cairo_set_source_rgb(cr, 0.0, 0.0, 0.0);
- osm_gps_map_source_get_min_zoom(OsmGpsMapSource_t source)
+     cairo_move_to (cr, 2*OSD_SCALE_FD, OSD_SCALE_H2-OSD_SCALE_FD);
- {
+     cairo_show_text (cr, dist_str);
-     return 1;
+     cairo_move_to (cr, 2*OSD_SCALE_FD,
- }
+                    OSD_SCALE_H2+OSD_SCALE_FD + extents.height);
+     cairo_show_text (cr, dist_str_imp);
+     g_free(dist_str);
+     g_free(dist_str_imp);
+     /* draw white line */
+     cairo_set_line_cap  (cr, CAIRO_LINE_CAP_ROUND);
+     cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
+     cairo_set_line_width (cr, OSD_SCALE_FONT_SIZE/3);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_M);
+     cairo_rel_line_to (cr, 0,  OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_metric, 0);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_I);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_imp, 0);
+     cairo_rel_line_to (cr, 0, +OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     /* draw black line */
+     cairo_set_source_rgba(cr, 0.0, 0.0, 0.0, 1.0);
+     cairo_set_line_width (cr, OSD_SCALE_FONT_SIZE/6);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_M);
+     cairo_rel_line_to (cr, 0,  OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_metric, 0);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_stroke(cr);
+     cairo_move_to (cr, OSD_SCALE_FONT_SIZE/6, OSD_SCALE_I);
+     cairo_rel_line_to (cr, 0, -OSD_SCALE_TICK);
+     cairo_rel_line_to (cr, width_imp, 0);
+     cairo_rel_line_to (cr, 0, +OSD_SCALE_TICK);
+     cairo_stroke(cr);
- int
+     cairo_destroy(cr);
- osm_gps_map_source_get_max_zoom(OsmGpsMapSource_t source)
- {
-     switch(source) {
-         case OSM_GPS_MAP_SOURCE_NULL:
-             return 18;
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP:
-             return OSM_MAX_ZOOM;
-         case OSM_GPS_MAP_SOURCE_OPENSTREETMAP_RENDERER:
-         case OSM_GPS_MAP_SOURCE_OPENAERIALMAP:
-         case OSM_GPS_MAP_SOURCE_GOOGLE_STREET:
-         case OSM_GPS_MAP_SOURCE_GOOGLE_HYBRID:
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_STREET:
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_SATELLITE:
-         case OSM_GPS_MAP_SOURCE_VIRTUAL_EARTH_HYBRID:
-         case OSM_GPS_MAP_SOURCE_YAHOO_STREET:
-         case OSM_GPS_MAP_SOURCE_YAHOO_SATELLITE:
-         case OSM_GPS_MAP_SOURCE_YAHOO_HYBRID:
-             return 17;
-         case OSM_GPS_MAP_SOURCE_MAPS_FOR_FREE:
-             return 11;
-         case OSM_GPS_MAP_SOURCE_GOOGLE_SATELLITE:
-             return 18;
-         default:
-             return 17;
-     }
-     return 17;
  }
+ #endif
- void
+ static void
- osm_gps_map_download_maps (OsmGpsMap *map, coord_t *pt1, coord_t *pt2, int zoom_start, int zoom_end)
+ osd_render_controls(osm_gps_map_osd_t *osd)
  {
-     int i,j,zoom,num_tiles;
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     OsmGpsMapPrivate *priv = map->priv;
-     if (pt1 && pt2)
+     if(priv->controls.rendered
-     {
+ #ifdef OSD_GPS_BUTTON
-         gchar *filename;
+        && (priv->controls.gps_enabled == (osd->cb != NULL))
-         num_tiles = 0;
+ #endif
-         zoom_end = CLAMP(zoom_end, priv->min_zoom, priv->max_zoom);
+        )
-         g_debug("Download maps: z:%d->%d",zoom_start, zoom_end);
+         return;
-         for(zoom=zoom_start; zoom<=zoom_end; zoom++)
-         {
-             int x1,y1,x2,y2;
-             x1 = (int)floor((float)lon2pixel(zoom, pt1->rlon) / (float)TILESIZE);
-             y1 = (int)floor((float)lat2pixel(zoom, pt1->rlat) / (float)TILESIZE);
-             x2 = (int)floor((float)lon2pixel(zoom, pt2->rlon) / (float)TILESIZE);
-             y2 = (int)floor((float)lat2pixel(zoom, pt2->rlat) / (float)TILESIZE);
-             // loop x1-x2
-             for(i=x1; i<=x2; i++)
-             {
-                 // loop y1 - y2
-                 for(j=y1; j<=y2; j++)
-                 {
-                     // x = i, y = j
-                     filename = g_strdup_printf("%s%c%d%c%d%c%d.%s",
-                                     priv->cache_dir, G_DIR_SEPARATOR,
-                                     zoom, G_DIR_SEPARATOR,
-                                     i, G_DIR_SEPARATOR,
-                                     j,
-                                     priv->image_format);
-                     if (!g_file_test(filename, G_FILE_TEST_EXISTS))
-                     {
-                         osm_gps_map_download_tile(map, zoom, i, j, FALSE);
-                         num_tiles++;
-                     }
-                     g_free(filename);
-                 }
-             }
-             g_debug("DL @Z:%d = %d tiles",zoom,num_tiles);
-         }
-     }
- }
- void
+ #ifdef OSD_GPS_BUTTON
- osm_gps_map_get_bbox (OsmGpsMap *map, coord_t *pt1, coord_t *pt2)
+     priv->controls.gps_enabled = (osd->cb != NULL);
- {
+ #endif
-     OsmGpsMapPrivate *priv = map->priv;
+     priv->controls.rendered = TRUE;
-     if (pt1 && pt2) {
+ #ifndef OSD_COLOR
-         pt1->rlat = pixel2lat(priv->map_zoom, priv->map_y);
+     GdkColor bg = GTK_WIDGET(osd->widget)->style->bg[GTK_STATE_NORMAL];
-         pt1->rlon = pixel2lon(priv->map_zoom, priv->map_x);
+     GdkColor fg = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_NORMAL];
-         pt2->rlat = pixel2lat(priv->map_zoom, priv->map_y + GTK_WIDGET(map)->allocation.height);
+     GdkColor da = GTK_WIDGET(osd->widget)->style->fg[GTK_STATE_INSENSITIVE];
-         pt2->rlon = pixel2lon(priv->map_zoom, priv->map_x + GTK_WIDGET(map)->allocation.width);
+ #endif
-         g_debug("BBOX: %f %f %f %f", pt1->rlat, pt1->rlon, pt2->rlat, pt2->rlon);
+     /* first fill with transparency */
-     }
+     cairo_t *cr = cairo_create(priv->controls.surface);
- }
+     cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+     cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
+     cairo_paint(cr);
+     cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
- void
+     /* --------- draw zoom and dpad shape shadow ----------- */
- osm_gps_map_set_mapcenter (OsmGpsMap *map, float latitude, float longitude, int zoom)
+ #ifdef OSD_SHADOW_ENABLE
- {
+     osd_zoom_shape(cr, 1+OSD_SHADOW, 1+OSD_SHADOW);
-     osm_gps_map_set_center (map, latitude, longitude);
+     osd_shape_shadow(cr);
-     osm_gps_map_set_zoom (map, zoom);
+ #ifndef OSD_NO_DPAD
- }
+     osd_dpad_shape(cr, 1+OSD_SHADOW, 1+OSD_SHADOW);
+     osd_shape_shadow(cr);
+ #endif
+ #endif
- void
+     /* --------- draw zoom and dpad shape ----------- */
- osm_gps_map_set_center (OsmGpsMap *map, float latitude, float longitude)
- {
-     int pixel_x, pixel_y;
-     OsmGpsMapPrivate *priv;
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osd_zoom_shape(cr, 1, 1);
-     priv = map->priv;
+ #ifndef OSD_COLOR
+     osd_shape(cr, &bg, &fg);
+ #else
+     osd_shape(cr);
+ #endif
+ #ifndef OSD_NO_DPAD
+     osd_dpad_shape(cr, 1, 1);
+ #ifndef OSD_COLOR
+     osd_shape(cr, &bg, &fg);
+ #else
+     osd_shape(cr);
+ #endif
+ #endif
-     priv->center_rlat = deg2rad(latitude);
+     /* --------- draw zoom and dpad labels --------- */
-     priv->center_rlon = deg2rad(longitude);
-     priv->center_coord_set = TRUE;
-     // pixel_x,y, offsets
+ #ifdef OSD_SHADOW_ENABLE
-     pixel_x = lon2pixel(priv->map_zoom, priv->center_rlon);
+     osd_labels_shadow(cr, Z_RAD/3, TRUE);
-     pixel_y = lat2pixel(priv->map_zoom, priv->center_rlat);
+     osd_zoom_labels(cr, 1+OSD_LBL_SHADOW, 1+OSD_LBL_SHADOW);
+ #ifndef OSD_NO_DPAD
+     osd_dpad_labels(cr, 1+OSD_LBL_SHADOW, 1+OSD_LBL_SHADOW);
+ #endif
+     cairo_stroke(cr);
+ #ifdef OSD_GPS_BUTTON
+     osd_labels_shadow(cr, Z_RAD/6, osd->cb != NULL);
+     osd_dpad_gps(cr, 1+OSD_LBL_SHADOW, 1+OSD_LBL_SHADOW);
+     cairo_stroke(cr);
+ #endif
+ #endif
-     priv->map_x = pixel_x - GTK_WIDGET(map)->allocation.width/2;
+ #ifndef OSD_COLOR
-     priv->map_y = pixel_y - GTK_WIDGET(map)->allocation.height/2;
+     osd_labels(cr, Z_RAD/3, TRUE, &fg, &da);
+ #else
+     osd_labels(cr, Z_RAD/3, TRUE);
+ #endif
+     osd_zoom_labels(cr, 1, 1);
+ #ifndef OSD_NO_DPAD
+     osd_dpad_labels(cr, 1, 1);
+ #endif
+     cairo_stroke(cr);
-     osm_gps_map_map_redraw_idle(map);
+ #ifndef OSD_COLOR
+     osd_labels(cr, Z_RAD/6, osd->cb != NULL, &fg, &da);
+ #else
+     osd_labels(cr, Z_RAD/6, osd->cb != NULL);
+ #endif
+ #ifdef OSD_GPS_BUTTON
+     osd_dpad_gps(cr, 1, 1);
+ #endif
+     cairo_stroke(cr);
+     cairo_destroy(cr);
  }
- int
+ static void
- osm_gps_map_set_zoom (OsmGpsMap *map, int zoom)
+ osd_render(osm_gps_map_osd_t *osd)
  {
-     int zoom_old;
+     /* this function is actually called pretty often since the */
-     double factor = 0.0;
+     /* OSD contents may have changed (due to a coordinate/zoom change). */
-     int width_center, height_center;
+     /* The different OSD parts have to make sure that they don't */
-     OsmGpsMapPrivate *priv;
+     /* render unneccessarily often and thus waste CPU power */
-     g_return_val_if_fail (OSM_IS_GPS_MAP (map), 0);
+     osd_render_controls(osd);
-     priv = map->priv;
-     if (zoom != priv->map_zoom)
-     {
-         width_center  = GTK_WIDGET(map)->allocation.width / 2;
-         height_center = GTK_WIDGET(map)->allocation.height / 2;
-         zoom_old = priv->map_zoom;
-         //constrain zoom min_zoom -> max_zoom
-         priv->map_zoom = CLAMP(zoom, priv->min_zoom, priv->max_zoom);
-         if (priv->center_coord_set)
-         {
-             priv->map_x = lon2pixel(priv->map_zoom, priv->center_rlon) - width_center;
-             priv->map_y = lat2pixel(priv->map_zoom, priv->center_rlat) - height_center;
-         }
-         else
-         {
-             factor = exp(priv->map_zoom * M_LN2)/exp(zoom_old * M_LN2);
-             priv->map_x = ((priv->map_x + width_center) * factor) - width_center;
-             priv->map_y = ((priv->map_y + height_center) * factor) - height_center;
-         }
-         g_debug("Zoom changed from %d to %d factor:%f x:%d",
+ #ifdef OSD_SOURCE_SEL
-                 zoom_old, priv->map_zoom, factor, priv->map_x);
+     osd_render_source_sel(osd, FALSE);
+ #endif
-         osm_gps_map_map_redraw_idle(map);
+ #ifdef OSD_SCALE
-     }
+     osd_render_scale(osd);
-     return priv->map_zoom;
+ #endif
- }
- void
+ #ifdef OSD_CROSSHAIR
- osm_gps_map_add_track (OsmGpsMap *map, GSList *track)
+     osd_render_crosshair(osd);
- {
+ #endif
-     OsmGpsMapPrivate *priv;
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+ #ifdef OSD_NAV
-     priv = map->priv;
+     osd_render_nav(osd);
+ #endif
-     if (track) {
+ #ifdef OSD_COORDINATES
-         priv->tracks = g_slist_append(priv->tracks, track);
+     osd_render_coordinates(osd);
-         osm_gps_map_map_redraw_idle(map);
+ #endif
-     }
  }
- void
+ static void
- osm_gps_map_clear_tracks (OsmGpsMap *map)
+ osd_draw(osm_gps_map_osd_t *osd, GdkDrawable *drawable)
  {
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osd_priv_t *priv = (osd_priv_t*)osd->priv;
-     osm_gps_map_free_tracks(map);
+     /* OSD itself uses some off-screen rendering, so check if the */
-     osm_gps_map_map_redraw_idle(map);
+     /* offscreen buffer is present and create it if not */
- }
+     if(!priv->controls.surface) {
+         /* create overlay ... */
+         priv->controls.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W+2, OSD_H+2);
- void
+         priv->controls.rendered = FALSE;
- osm_gps_map_add_image (OsmGpsMap *map, float latitude, float longitude, GdkPixbuf *image)
+ #ifdef OSD_GPS_BUTTON
- {
+         priv->controls.gps_enabled = FALSE;
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+ #endif
-     if (image) {
+ #ifdef OSD_SOURCE_SEL
-         OsmGpsMapPrivate *priv = map->priv;
+         /* the initial OSD state is alway not-expanded */
-         image_t *im;
+         priv->source_sel.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                            OSD_S_W+2, OSD_S_H+2);
+         priv->source_sel.rendered = FALSE;
+ #endif
-         //cache w/h for speed, and add image to list
+ #ifdef OSD_SCALE
-         im = g_new0(image_t,1);
+         priv->scale.surface =
-         im->w = gdk_pixbuf_get_width(image);
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
-         im->h = gdk_pixbuf_get_height(image);
+                                        OSD_SCALE_W, OSD_SCALE_H);
-         im->pt.rlat = deg2rad(latitude);
+         priv->scale.zoom = -1;
-         im->pt.rlon = deg2rad(longitude);
+ #endif
-         g_object_ref(image);
+ #ifdef OSD_CROSSHAIR
-         im->image = image;
+         priv->crosshair.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                        OSD_CROSSHAIR_W, OSD_CROSSHAIR_H);
+         priv->crosshair.rendered = FALSE;
+ #endif
-         priv->images = g_slist_append(priv->images, im);
+ #ifdef OSD_COORDINATES
+         priv->coordinates.surface =
+             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
+                                        OSD_COORDINATES_W, OSD_COORDINATES_H);
-         osm_gps_map_map_redraw_idle(map);
+         priv->coordinates.lat = priv->coordinates.lon = OSM_GPS_MAP_INVALID;
-     }
+ #endif
- }
- gboolean
+         /* ... and render it */
- osm_gps_map_remove_image (OsmGpsMap *map, GdkPixbuf *image)
+         osd_render(osd);
- {
-     OsmGpsMapPrivate *priv = map->priv;
-     if (priv->images) {
-         GSList *list;
-         for(list = priv->images; list != NULL; list = list->next)
-         {
-             image_t *im = list->data;
-                 if (im->image == image)
-                 {
-                         priv->images = g_slist_remove_link(priv->images, list);
-                         g_object_unref(im->image);
-                         g_free(im);
-                         osm_gps_map_map_redraw_idle(map);
-                         return TRUE;
-                 }
-         }
      }
-     return FALSE;
- }
- void
- osm_gps_map_clear_images (OsmGpsMap *map)
- {
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
-     osm_gps_map_free_images(map);
+     // now draw this onto the original context
-     osm_gps_map_map_redraw_idle(map);
+     cairo_t *cr = gdk_cairo_create(drawable);
- }
- void
+     gint x, y;
- osm_gps_map_osd_speed (OsmGpsMap *map, float speed)
- {
-     OsmGpsMapPrivate *priv;
-     PangoContext        *context = NULL;
+ #ifdef OSD_SCALE
-     PangoLayout     *layout  = NULL;
+     x =  OSD_X;
-     PangoFontDescription    *desc    = NULL;
+     y = -OSD_Y;
+     if(x < 0) x += osd->widget->allocation.width - OSD_SCALE_W;
-     GdkColor color;
+     if(y < 0) y += osd->widget->allocation.height - OSD_SCALE_H;
-     GdkGC *gc;
-     gchar *buffer;
-     //static int x = 10, y = 10;
-     static int width = 0, height = 0;
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     cairo_set_source_surface(cr, priv->scale.surface, x, y);
-     priv = map->priv;
+     cairo_paint(cr);
+ #endif
-     buffer = g_strdup_printf("%.0f", speed);
+ #ifdef OSD_CROSSHAIR
+     x = (osd->widget->allocation.width - OSD_CROSSHAIR_W)/2;
+     y = (osd->widget->allocation.height - OSD_CROSSHAIR_H)/2;
-     /* pango initialisation */
+     cairo_set_source_surface(cr, priv->crosshair.surface, x, y);
-     context = gtk_widget_get_pango_context (GTK_WIDGET(map));
+     cairo_paint(cr);
-     layout  = pango_layout_new (context);
+ #endif
-     desc    = pango_font_description_new();
-     pango_font_description_set_size (desc, 40 * PANGO_SCALE);
-     pango_layout_set_font_description (layout, desc);
-     pango_layout_set_text (layout, buffer, strlen(buffer));
-     gc = gdk_gc_new (GTK_WIDGET(map)->window);
-     color.red = (0 > 50) ? 0xffff : 0;
-     color.green = 0;
-     color.blue = 0;
-     gdk_gc_set_rgb_fg_color (gc, &color);
-     /* faster / less flicker alternative:*/
-     gdk_draw_drawable (
-                        GTK_WIDGET(map)->window,
-                        GTK_WIDGET(map)->style->fg_gc[GTK_WIDGET_STATE(map)],
-                        priv->pixmap,
-,0,
-,0,
-                        width+10,width+10);
-     gdk_draw_layout(GTK_WIDGET(map)->window,
-                     gc,
-, 0,
-                     layout);
-     /* set width and height */
-     pango_layout_get_pixel_size(layout, &width, &height);
-     g_free(buffer);
-     pango_font_description_free (desc);
-     g_object_unref (layout);
-     g_object_unref (gc);
- }
- void
+ #ifdef OSD_NAV
- osm_gps_map_draw_gps (OsmGpsMap *map, float latitude, float longitude, float heading)
+     if(priv->nav.surface) {
- {
+         x =  OSD_X;
-     int pixel_x, pixel_y;
+         if(x < 0) x += osd->widget->allocation.width - OSD_NAV_W;
-     OsmGpsMapPrivate *priv;
+         y = (osd->widget->allocation.height - OSD_NAV_H)/2;
+         cairo_set_source_surface(cr, priv->nav.surface, x, y);
+         cairo_paint(cr);
+     }
+ #endif
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+ #ifdef OSD_COORDINATES
-     priv = map->priv;
+     x = -OSD_X;
+     y = -OSD_Y;
+     if(x < 0) x += osd->widget->allocation.width - OSD_COORDINATES_W;
+     if(y < 0) y += osd->widget->allocation.height - OSD_COORDINATES_H;
-     priv->gps->rlat = deg2rad(latitude);
+     cairo_set_source_surface(cr, priv->coordinates.surface, x, y);
-     priv->gps->rlon = deg2rad(longitude);
+     cairo_paint(cr);
-     priv->gps_valid = TRUE;
+ #endif
-     // pixel_x,y, offsets
-     pixel_x = lon2pixel(priv->map_zoom, priv->gps->rlon);
-     pixel_y = lat2pixel(priv->map_zoom, priv->gps->rlat);
-     //If trip marker add to list of gps points.
-     if (priv->record_trip_history) {
-         coord_t *tp = g_new0(coord_t,1);
-         tp->rlat = priv->gps->rlat;
-         tp->rlon = priv->gps->rlon;
-         priv->trip_history = g_slist_append(priv->trip_history, tp);
-     }
-     // dont draw anything if we are dragging
-     if (priv->dragging) {
-         g_debug("Dragging");
-         return;
-     }
-     //Automatically center the map if the track approaches the edge
+ #ifdef OSD_BALLOON
-     if(priv->map_auto_center)   {
+     if(priv->balloon.surface) {
-         int x = pixel_x - priv->map_x;
-         int y = pixel_y - priv->map_y;
+         /* convert given lat lon into screen coordinates */
-         int width = GTK_WIDGET(map)->allocation.width;
+         gint x, y;
-         int height = GTK_WIDGET(map)->allocation.height;
+         osm_gps_map_geographic_to_screen (OSM_GPS_MAP(osd->widget),
-         if( x < (width/2 - width/8)     || x > (width/2 + width/8)  ||
+                                       priv->balloon.lat, priv->balloon.lon,
-             y < (height/2 - height/8)   || y > (height/2 + height/8)) {
+                                       &x, &y);
-             priv->map_x = pixel_x - GTK_WIDGET(map)->allocation.width/2;
-             priv->map_y = pixel_y - GTK_WIDGET(map)->allocation.height/2;
-             priv->center_coord_set = FALSE;
-         }
-     }
-     // this redraws the map (including the gps track, and adjusts the
+         /* check if balloon needs to be rerendered */
-     // map center if it was changed
+         osd_render_balloon(osd);
-     osm_gps_map_map_redraw_idle(map);
- }
- void
+         cairo_set_source_surface(cr, priv->balloon.surface,
- osm_gps_map_clear_gps (OsmGpsMap *map)
+                                  x + priv->balloon.offset_x,
- {
+                                  y + priv->balloon.offset_y);
-     osm_gps_map_free_trip(map);
+         cairo_paint(cr);
-     osm_gps_map_map_redraw_idle(map);
+     }
- }
+ #endif
- coord_t
+     x = OSD_X;
- osm_gps_map_get_co_ordinates (OsmGpsMap *map, int pixel_x, int pixel_y)
+     if(x < 0)
- {
+         x += osd->widget->allocation.width - OSD_W;
-     coord_t coord;
-     OsmGpsMapPrivate *priv = map->priv;
-     coord.rlat = pixel2lat(priv->map_zoom, priv->map_y + pixel_y);
+     y = OSD_Y;
-     coord.rlon = pixel2lon(priv->map_zoom, priv->map_x + pixel_x);
+     if(y < 0)
-     return coord;
+         y += osd->widget->allocation.height - OSD_H;
- }
- GtkWidget *
+     cairo_set_source_surface(cr, priv->controls.surface, x, y);
- osm_gps_map_new (void)
+     cairo_paint(cr);
- {
-     return g_object_new (OSM_TYPE_GPS_MAP, NULL);
- }
- void
+ #ifdef OSD_SOURCE_SEL
- osm_gps_map_screen_to_geographic (OsmGpsMap *map, gint pixel_x, gint pixel_y,
+     if(!priv->source_sel.handler_id) {
-                                   gfloat *latitude, gfloat *longitude)
+         /* the OSD source selection is not being animated */
- {
+         if(!priv->source_sel.expanded)
-     OsmGpsMapPrivate *priv;
+             x = osd->widget->allocation.width - OSD_S_W;
+         else
+             x = osd->widget->allocation.width - OSD_S_EXP_W + OSD_S_X;
+     } else
+         x = priv->source_sel.shift;
+     y = OSD_S_Y;
+     if(OSD_S_Y < 0) {
+         if(!priv->source_sel.expanded)
+             y = osd->widget->allocation.height - OSD_S_H + OSD_S_Y;
+         else
+             y = osd->widget->allocation.height - OSD_S_EXP_H + OSD_S_Y;
+     }
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     cairo_set_source_surface(cr, priv->source_sel.surface, x, y);
-     priv = map->priv;
+     cairo_paint(cr);
+ #endif
-     if (latitude)
+     cairo_destroy(cr);
-         *latitude = rad2deg(pixel2lat(priv->map_zoom, priv->map_y + pixel_y));
-     if (longitude)
-         *longitude = rad2deg(pixel2lon(priv->map_zoom, priv->map_x + pixel_x));
  }
- void
+ static void
- osm_gps_map_geographic_to_screen (OsmGpsMap *map,
+ osd_free(osm_gps_map_osd_t *osd)
-                                   gfloat latitude, gfloat longitude,
-                                   gint *pixel_x, gint *pixel_y)
  {
-     OsmGpsMapPrivate *priv;
+     osd_priv_t *priv = (osd_priv_t *)(osd->priv);
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     if (priv->controls.surface)
-     priv = map->priv;
+          cairo_surface_destroy(priv->controls.surface);
-     if (pixel_x)
+ #ifdef OSD_SOURCE_SEL
-         *pixel_x = lon2pixel(priv->map_zoom, deg2rad(longitude)) - priv->map_x;
+     if(priv->source_sel.handler_id)
-     if (pixel_y)
+         gtk_timeout_remove(priv->source_sel.handler_id);
-         *pixel_y = lat2pixel(priv->map_zoom, deg2rad(latitude)) - priv->map_y;
- }
- void
+     if (priv->source_sel.surface)
- osm_gps_map_scroll (OsmGpsMap *map, gint dx, gint dy)
+          cairo_surface_destroy(priv->source_sel.surface);
- {
+ #endif
-     OsmGpsMapPrivate *priv;
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+ #ifdef OSD_SCALE
-     priv = map->priv;
+     if (priv->scale.surface)
+          cairo_surface_destroy(priv->scale.surface);
+ #endif
-     priv->center_coord_set = FALSE;
+ #ifdef OSD_CROSSHAIR
-     priv->map_x += dx;
+     if (priv->crosshair.surface)
-     priv->map_y += dy;
+          cairo_surface_destroy(priv->crosshair.surface);
+ #endif
-     osm_gps_map_map_redraw_idle (map);
+ #ifdef OSD_NAV
- }
+     if (priv->nav.surface)
+          cairo_surface_destroy(priv->nav.surface);
+ #endif
- float
+ #ifdef OSD_COORDINATES
- osm_gps_map_get_scale(OsmGpsMap *map)
+     if (priv->coordinates.surface)
- {
+          cairo_surface_destroy(priv->coordinates.surface);
-     OsmGpsMapPrivate *priv;
+ #endif
-     g_return_val_if_fail (OSM_IS_GPS_MAP (map), OSM_NAN);
+ #ifdef OSD_BALLOON
-     priv = map->priv;
+     if (priv->balloon.surface)
+          cairo_surface_destroy(priv->balloon.surface);
+ #endif
-     return osm_gps_map_get_scale_at_point(priv->map_zoom, priv->center_rlat, priv->center_rlon);
+     g_free(priv);
  }
- #ifdef ENABLE_BALLOON
+ static gboolean
- void
+ osd_busy(osm_gps_map_osd_t *osd)
- osm_gps_map_draw_balloon (OsmGpsMap *map, float latitude, float longitude,
-                           OsmGpsMapBalloonCallback cb, gpointer data)
  {
-     OsmGpsMapPrivate *priv;
+ #ifdef OSD_SOURCE_SEL
+     osd_priv_t *priv = (osd_priv_t *)(osd->priv);
-     /* remove and previously installed balloon */
+     return (priv->source_sel.handler_id != 0);
-     osm_gps_map_clear_balloon (map);
+ #else
+     return FALSE;
+ #endif
+ }
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+ static osm_gps_map_osd_t osd_classic = {
-     priv = map->priv;
+     .widget     = NULL,
-     priv->balloon.coo->rlat = deg2rad(latitude);
+     .draw       = osd_draw,
-     priv->balloon.coo->rlon = deg2rad(longitude);
+     .check      = osd_check,
-     priv->balloon.valid = TRUE;
+     .render     = osd_render,
+     .free       = osd_free,
+     .busy       = osd_busy,
-     priv->balloon.cb = cb;
+     .cb         = NULL,
-     priv->balloon.data = data;
+     .data       = NULL,
-     // this redraws the map
+     .priv       = NULL
-     osm_gps_map_map_redraw_idle(map);
+ };
- }
- void
+ /* this is the only function that's externally visible */
- osm_gps_map_clear_balloon (OsmGpsMap *map)
+ void
+ osm_gps_map_osd_classic_init(OsmGpsMap *map)
  {
-     OsmGpsMapPrivate *priv;
+     osd_priv_t *priv = osd_classic.priv = g_new0(osd_priv_t, 1);
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
-     priv = map->priv;
-     priv->balloon.valid = FALSE;
+ #ifdef OSD_BALLOON
+     priv->balloon.lat = OSM_GPS_MAP_INVALID;
-     osm_gps_map_map_redraw_idle(map);
+     priv->balloon.lon = OSM_GPS_MAP_INVALID;
- }
  #endif
- #ifdef ENABLE_OSD
+     osd_classic.priv = priv;
- void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdGpsCallback cb, gpointer data) {
-     OsmGpsMapPrivate *priv;
-     g_return_if_fail (OSM_IS_GPS_MAP (map));
+     osm_gps_map_register_osd(map, &osd_classic);
-     priv = map->priv;
+ }
-     priv->osd.cb = cb;
+ #ifdef OSD_GPS_BUTTON
-     priv->osd.data = data;
+ /* below are osd specific functions which aren't used by osm-gps-map */
+ /* but instead are to be used by the main application */
+ void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb,
+                                  gpointer data) {
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_if_fail (osd);
+     osd->cb = cb;
+     osd->data = data;
      /* this may have changed the state of the gps button */
      /* we thus re-render the overlay */
-     osm_gps_map_osd_render(priv);
+     osd->render(osd);
-     osm_gps_map_map_redraw_idle(map);
+     osm_gps_map_redraw(map);
  }
  #endif
+ osd_button_t
+ osm_gps_map_osd_check(OsmGpsMap *map, gint x, gint y) {
+     osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
+     g_return_val_if_fail (osd, OSD_NONE);
+     return osd_check(osd, TRUE, x, y);
+ }

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-Removed from v.70
+Added in v.133