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

/*
 * Copyright (C) Till Harbaum 2009 <till@harbaum.org>
 *
 * osm-gps-map is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * osm-gps-map is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#ifdef USE_CAIRO
#include <cairo.h>
#endif

//the osd controls
typedef struct {
    GdkPixmap *backup;
    cairo_surface_t *overlay;
    gint backup_x, backup_y;
    OsmGpsMapOsdGpsCallback cb;
    gpointer data;
} osd_priv_t;

typedef struct {


    gpointer priv;
} osm_gps_map_osd_t;

/* position and extent of bounding box */
#define OSD_X      (10)
#define OSD_Y      (10)

#define OSD_COLOR            0.5, 0.5, 1
#define OSD_COLOR_DISABLED   0.8, 0.8, 0.8

/* parameters of the direction shape */
#ifndef OSM_GPS_MAP_OSD_DIAMETER
#define D_RAD  (30)         // diameter of dpad
#else
#define D_RAD  (OSM_GPS_MAP_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
#define D_WID  (D_LEN)      // width of arrow

/* parameters of the "zoom" pad */
#define Z_STEP   (D_RAD/4)  // distance between dpad and zoom
#define Z_RAD    (D_RAD/2)  // radius of "caps" of zoom bar

/* shadow also depends on control size */
#define OSD_SHADOW (D_RAD/6)

/* total width and height of controls incl. shadow */
#define OSD_W    (2*D_RAD + OSD_SHADOW)
#define OSD_H    (2*D_RAD + Z_STEP + 2*Z_RAD + OSD_SHADOW)

#define OSD_LBL_SHADOW (OSD_SHADOW/2)

#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)

/* create the cairo shape used for the zoom buttons */
static void 
osm_gps_map_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);
    cairo_line_to (cr, x+Z_LEFT,    y+Z_BOT);
    cairo_arc     (cr, x+Z_LEFT,    y+Z_MID, Z_RAD,  M_PI/2, -M_PI/2);
}

/* create the cairo shape used for the dpad */
static void 
osm_gps_map_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);
}

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) 
{
    return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
}

/* check whether x/y is within the dpad */
static osd_button_t
osm_gps_map_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)) 
    {
        /* convert into position relative to dpads centre */
        x -= (OSD_X + D_RAD);
        y -= (OSD_Y + D_RAD);

        /* check for dpad center goes here! */
        if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3)) 
            return OSD_GPS;

        if( y < 0 && abs(x) < abs(y))
            return OSD_UP;

        if( y > 0 && abs(x) < abs(y))
            return OSD_DOWN;

        if( x < 0 && abs(y) < abs(x))
            return OSD_LEFT;

        if( x > 0 && abs(y) < abs(x))
            return OSD_RIGHT;

        return OSD_BG;
    }
    return OSD_NONE;
}

/* check whether x/y is within the zoom pads */
static osd_button_t
osm_gps_map_osd_check_zoom(gint x, gint y) {
    if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_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)) 
            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)) 
            return OSD_IN;

        /* between center of (+) button and center of entire zoom control area */
        if(x < OSD_RIGHT && x > OSD_X + D_RAD) 
            return OSD_IN;
    }
 
    return OSD_NONE;
}

static osd_button_t
osm_gps_map_osd_check(gint x, gint y) {
    osd_button_t but = OSD_NONE;

    /* first do a rough test for the OSD area. */
    /* this is just to avoid an unnecessary detailed test */
    if(x > OSD_X && x < OSD_X + OSD_W && 
       y > OSD_Y && y < OSD_Y + OSD_H) {
        but = osm_gps_map_osd_check_dpad(x, y);

        if(but == OSD_NONE) 
            but = osm_gps_map_osd_check_zoom(x, y);
    }

    return but;
}

static void 
osm_gps_map_osd_shape_shadow(cairo_t *cr) {
    cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
    cairo_fill (cr);
    cairo_stroke (cr);
}

static void 
osm_gps_map_osd_shape(cairo_t *cr) {
    cairo_set_source_rgb (cr, 1, 1, 1);
    cairo_fill_preserve (cr);
    cairo_set_source_rgb (cr, OSD_COLOR);
    cairo_set_line_width (cr, 1);
    cairo_stroke (cr);
}

static void
osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
    /* move reference to dpad center */
    x += D_RAD;
    y += D_RAD;

    const static gint offset[][3][2] = {
        /* left arrow/triangle */
        { { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
        /* right arrow/triangle */
        { { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
        /* top arrow/triangle */
        { { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
        /* bottom arrow/triangle */
        { { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
    };

    int i;
    for(i=0;i<4;i++) {
        cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
        cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
        cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
    }
}

/* draw the sattelite dish icon in the center of the dpad */
#define GPS_V0  (D_RAD/8)
#define GPS_V1  (D_RAD/10)
#define GPS_V2  (D_RAD/5)

/* draw a satellite receiver dish */
static void
osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
    /* move reference to dpad center */
    x += D_RAD;
    y += D_RAD + GPS_V0;

    cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
    cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
    cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
    cairo_close_path (cr);

    cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
    cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
    cairo_close_path (cr);

    x += GPS_V1;
    cairo_move_to (cr, x, y-GPS_V2);
    cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
}

#define Z_LEN  (2*Z_RAD/3)

static void
osm_gps_map_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);

    cairo_move_to (cr, x + Z_RIGHT,         y + Z_MID - Z_LEN);
    cairo_line_to (cr, x + Z_RIGHT,         y + Z_MID + Z_LEN);
    cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
    cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
}

static void
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 */
    cairo_t *cr = cairo_create(priv->osd.overlay);
    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
osm_gps_map_osd_restore (OsmGpsMap *map) 
{
    OsmGpsMapPrivate *priv = map->priv;

    /* restore backup of previous contents */
    if(priv->osd.backup) {
        /* 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);
    }
}

#endif

static gboolean
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, 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

#ifdef ENABLE_OSD
    priv->osd.backup = NULL;
    priv->osd.overlay = NULL;
    priv->osd.cb = NULL;
#endif

    priv->tracks = NULL;
    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 *
osm_gps_map_constructor (GType gtype, guint n_properties, GObjectConstructParam *properties)
{
    GObject *object;
    OsmGpsMapPrivate *priv;
    OsmGpsMap *map;
    const char *uri;

    //Always chain up to the parent constructor
    object = G_OBJECT_CLASS(osm_gps_map_parent_class)->constructor(gtype, n_properties, properties);
    map = OSM_GPS_MAP(object);
    priv = OSM_GPS_MAP_PRIVATE(object);

    //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) {
#ifdef G_CHECKSUM_MD5
        char *md5 = g_compute_checksum_for_string (G_CHECKSUM_MD5, priv->repo_uri, -1);
#else
        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);
    }

    inspect_map_uri(map);

    return object;
}

static void
osm_gps_map_dispose (GObject *object)
{
    OsmGpsMap *map = OSM_GPS_MAP(object);
    OsmGpsMapPrivate *priv = map->priv;

    if (priv->is_disposed)
        return;

    priv->is_disposed = TRUE;

    soup_session_abort(priv->soup_session);
    g_object_unref(priv->soup_session);

    g_hash_table_destroy(priv->tile_queue);
    g_hash_table_destroy(priv->missing_tiles);
    g_hash_table_destroy(priv->tile_cache);

    osm_gps_map_free_images(map);

    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
    g_free(priv->balloon.coo);
#endif

#ifdef ENABLE_OSD
    if (priv->osd.backup)
        g_object_unref(priv->osd.backup);

    if (priv->osd.overlay)
         cairo_surface_destroy(priv->osd.overlay);
#endif

    G_OBJECT_CLASS (osm_gps_map_parent_class)->dispose (object);
}

static void
osm_gps_map_finalize (GObject *object)
{
    OsmGpsMap *map = OSM_GPS_MAP(object);
    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);
    osm_gps_map_free_tracks(map);

    G_OBJECT_CLASS (osm_gps_map_parent_class)->finalize (object);
}

static void
osm_gps_map_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    g_return_if_fail (OSM_IS_GPS_MAP (object));
    OsmGpsMap *map = OSM_GPS_MAP(object);
    OsmGpsMapPrivate *priv = map->priv;

    switch (prop_id)
    {
        case PROP_AUTO_CENTER:
            priv->map_auto_center = g_value_get_boolean (value);
            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);
#else
                SoupUri* uri = soup_uri_new(priv->proxy_uri);
                g_object_set(G_OBJECT(priv->soup_session), SOUP_SESSION_PROXY_URI, uri, NULL);
#endif
            } else
                priv->proxy_uri = NULL;

            break;
        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;
    }
}

static void
osm_gps_map_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    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)
    {
        case PROP_AUTO_CENTER:
            g_value_set_boolean(value, priv->map_auto_center);
            break;
        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
osm_gps_map_scroll_event (GtkWidget *widget, GdkEventScroll  *event)
{
    OsmGpsMap *map = OSM_GPS_MAP(widget);
    OsmGpsMapPrivate *priv = map->priv;

    if (event->direction == GDK_SCROLL_UP)
    {
        osm_gps_map_set_zoom(map, priv->map_zoom+1);
    }
    else
    {
        osm_gps_map_set_zoom(map, priv->map_zoom-1);
    }

    return FALSE;
}

static gboolean
osm_gps_map_button_press (GtkWidget *widget, GdkEventButton *event)
{
    OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);

#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
    #define SCROLL_STEP 10

    /* 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;
    priv->drag_start_mouse_x = (int) event->x;
    priv->drag_start_mouse_y = (int) event->y;
    priv->drag_start_map_x = priv->map_x;
    priv->drag_start_map_y = priv->map_y;

    return FALSE;
}

static gboolean
osm_gps_map_button_release (GtkWidget *widget, GdkEventButton *event)
{
    OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);

#ifdef ENABLE_BALLOON
    /* released inside the balloon? */
    if (osm_gps_map_in_balloon(priv, 
                   event->x + EXTRA_BORDER, 
                   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)
    {
        priv->dragging = FALSE;

        priv->map_x = priv->drag_start_map_x;
        priv->map_y = priv->drag_start_map_y;

        priv->map_x += (priv->drag_start_mouse_x - (int) event->x);
        priv->map_y += (priv->drag_start_mouse_y - (int) event->y);

        priv->center_coord_set = FALSE;

        osm_gps_map_map_redraw_idle(OSM_GPS_MAP(widget));
    }

    priv->drag_mouse_dx = 0;
    priv->drag_mouse_dy = 0;
    priv->drag_counter = -1;

    return FALSE;
}

static gboolean
osm_gps_map_expose (GtkWidget *widget, GdkEventExpose  *event);

static gboolean
osm_gps_map_motion_notify (GtkWidget *widget, GdkEventMotion  *event)
{
    int x, y;
    GdkModifierType state;
    OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);

    if (event->is_hint)
        gdk_window_get_pointer (event->window, &x, &y, &state);
    else
    {
        x = event->x;
        y = event->y;
        state = event->state;
    }

    // are we being dragged
    if (!(state & GDK_BUTTON1_MASK))
        return FALSE;

    if (priv->drag_counter < 0) 
        return FALSE;

    priv->drag_counter++;

    // we havent dragged more than 6 pixels
    if (priv->drag_counter < 6)
        return FALSE;

#ifdef USE_MAEMO
    /* reduce update frequency on maemo to keep screen update fluid */
    static guint32 last_time = 0;

    if(event->time - last_time < 100) return FALSE;
    last_time = event->time;
#endif

    priv->dragging = TRUE;

    if (priv->map_auto_center)
        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
    /* undo OSD */
    osm_gps_map_osd_restore (OSM_GPS_MAP(widget));

    /* draw new OSD */
    osm_gps_map_osd_draw_controls (OSM_GPS_MAP(widget),
                                   -priv->drag_mouse_dx,
                                   -priv->drag_mouse_dy);
#endif

    osm_gps_map_expose (widget, NULL);


    return FALSE;
}

static gboolean
osm_gps_map_configure (GtkWidget *widget, GdkEventConfigure *event)
{
    OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);

    /* create pixmap */
    if (priv->pixmap)
        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......) */
    if(priv->gc_map)
        g_object_unref(priv->gc_map);

    priv->gc_map = gdk_gc_new(priv->pixmap);

    osm_gps_map_map_redraw(OSM_GPS_MAP(widget));

    return FALSE;
}

static gboolean
osm_gps_map_expose (GtkWidget *widget, GdkEventExpose  *event)
{
    OsmGpsMapPrivate *priv = OSM_GPS_MAP_PRIVATE(widget);

    gdk_draw_drawable (
                       widget->window,
                       widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
                       priv->pixmap,
                       0,0,
                       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, 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, 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,
                            0, 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;
}

static void
osm_gps_map_class_init (OsmGpsMapClass *klass)
{
    GObjectClass* object_class = G_OBJECT_CLASS (klass);
    GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);

    g_type_class_add_private (klass, sizeof (OsmGpsMapPrivate));

    object_class->dispose = osm_gps_map_dispose;
    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 */
                                                       3,
                                                       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 */
                                                         90.0, /* maximum property value */
                                                         0,
                                                         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 */
                                                         180.0, /* maximum property value */
                                                         0,
                                                         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 */
                                                       890,
                                                       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 */
                                                       515,
                                                       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 */
                                                       0,
                                                       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",
                                                       1,           /* minimum property value */
                                                       G_MAXINT,    /* maximum property value */
                                                       4,
                                                       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",
                                                       0,           /* minimum property value */
                                                       G_MAXINT,    /* maximum property value */
                                                       10,
                                                       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",
                                                       0,           /* minimum property value */
                                                       G_MAXINT,    /* maximum property value */
                                                       20,
                                                       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* 
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 *
osm_gps_map_source_get_image_format(OsmGpsMapSource_t source)
{
    switch(source) {
        case OSM_GPS_MAP_SOURCE_NULL:
        case OSM_GPS_MAP_SOURCE_OPENSTREETMAP:
        case OSM_GPS_MAP_SOURCE_OPENSTREETMAP_RENDERER:
            return "png";
        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:
        case OSM_GPS_MAP_SOURCE_MAPS_FOR_FREE:
        case OSM_GPS_MAP_SOURCE_GOOGLE_SATELLITE:
            return "jpg";
        default:
            return "bin";
    }
    return "bin";
}


int 
osm_gps_map_source_get_min_zoom(OsmGpsMapSource_t source)
{
    return 1;
}

int 
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;
}

void
osm_gps_map_download_maps (OsmGpsMap *map, coord_t *pt1, coord_t *pt2, int zoom_start, int zoom_end)
{
    int i,j,zoom,num_tiles;
    OsmGpsMapPrivate *priv = map->priv;

    if (pt1 && pt2)
    {
        gchar *filename;
        num_tiles = 0;
        zoom_end = CLAMP(zoom_end, priv->min_zoom, priv->max_zoom);
        g_debug("Download maps: z:%d->%d",zoom_start, zoom_end);

        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
osm_gps_map_get_bbox (OsmGpsMap *map, coord_t *pt1, coord_t *pt2)
{
    OsmGpsMapPrivate *priv = map->priv;

    if (pt1 && pt2) {
        pt1->rlat = pixel2lat(priv->map_zoom, priv->map_y);
        pt1->rlon = pixel2lon(priv->map_zoom, priv->map_x);
        pt2->rlat = pixel2lat(priv->map_zoom, priv->map_y + GTK_WIDGET(map)->allocation.height);
        pt2->rlon = pixel2lon(priv->map_zoom, priv->map_x + GTK_WIDGET(map)->allocation.width);

        g_debug("BBOX: %f %f %f %f", pt1->rlat, pt1->rlon, pt2->rlat, pt2->rlon);
    }
}

void
osm_gps_map_set_mapcenter (OsmGpsMap *map, float latitude, float longitude, int zoom)
{
    osm_gps_map_set_center (map, latitude, longitude);
    osm_gps_map_set_zoom (map, zoom);
}

void
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));
    priv = map->priv;

    priv->center_rlat = deg2rad(latitude);
    priv->center_rlon = deg2rad(longitude);
    priv->center_coord_set = TRUE;

    // pixel_x,y, offsets
    pixel_x = lon2pixel(priv->map_zoom, priv->center_rlon);
    pixel_y = lat2pixel(priv->map_zoom, priv->center_rlat);

    priv->map_x = pixel_x - GTK_WIDGET(map)->allocation.width/2;
    priv->map_y = pixel_y - GTK_WIDGET(map)->allocation.height/2;

    osm_gps_map_map_redraw_idle(map);
}

int 
osm_gps_map_set_zoom (OsmGpsMap *map, int zoom)
{
    int zoom_old;
    double factor = 0.0;
    int width_center, height_center;
    OsmGpsMapPrivate *priv;

    g_return_val_if_fail (OSM_IS_GPS_MAP (map), 0);
    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",
                zoom_old, priv->map_zoom, factor, priv->map_x);

        osm_gps_map_map_redraw_idle(map);
    }
    return priv->map_zoom;
}

void
osm_gps_map_add_track (OsmGpsMap *map, GSList *track)
{
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    if (track) {
        priv->tracks = g_slist_append(priv->tracks, track);
        osm_gps_map_map_redraw_idle(map);
    }
}

void
osm_gps_map_clear_tracks (OsmGpsMap *map)
{
    g_return_if_fail (OSM_IS_GPS_MAP (map));

    osm_gps_map_free_tracks(map);
    osm_gps_map_map_redraw_idle(map);
}

void
osm_gps_map_add_image (OsmGpsMap *map, float latitude, float longitude, GdkPixbuf *image)
{
    g_return_if_fail (OSM_IS_GPS_MAP (map));

    if (image) {
        OsmGpsMapPrivate *priv = map->priv;
        image_t *im;

        //cache w/h for speed, and add image to list
        im = g_new0(image_t,1);
        im->w = gdk_pixbuf_get_width(image);
        im->h = gdk_pixbuf_get_height(image);
        im->pt.rlat = deg2rad(latitude);
        im->pt.rlon = deg2rad(longitude);

        g_object_ref(image);
        im->image = image;

        priv->images = g_slist_append(priv->images, im);

        osm_gps_map_map_redraw_idle(map);
    }
}

gboolean
osm_gps_map_remove_image (OsmGpsMap *map, GdkPixbuf *image)
{
    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);
    osm_gps_map_map_redraw_idle(map);
}

void
osm_gps_map_osd_speed (OsmGpsMap *map, float speed)
{
    OsmGpsMapPrivate *priv;

    PangoContext        *context = NULL;
    PangoLayout     *layout  = NULL;
    PangoFontDescription    *desc    = NULL;

    GdkColor color;
    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));
    priv = map->priv;

    buffer = g_strdup_printf("%.0f", speed);

    /* pango initialisation */
    context = gtk_widget_get_pango_context (GTK_WIDGET(map));
    layout  = pango_layout_new (context);
    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,
                       0,0,
                       width+10,width+10);

    gdk_draw_layout(GTK_WIDGET(map)->window,
                    gc,
                    0, 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
osm_gps_map_draw_gps (OsmGpsMap *map, float latitude, float longitude, float heading)
{
    int pixel_x, pixel_y;
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    priv->gps->rlat = deg2rad(latitude);
    priv->gps->rlon = deg2rad(longitude);
    priv->gps_valid = TRUE;

    // 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
    if(priv->map_auto_center)   {
        int x = pixel_x - priv->map_x;
        int y = pixel_y - priv->map_y;
        int width = GTK_WIDGET(map)->allocation.width;
        int height = GTK_WIDGET(map)->allocation.height;
        if( x < (width/2 - width/8)     || x > (width/2 + width/8)  ||
            y < (height/2 - height/8)   || y > (height/2 + height/8)) {

            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
    // map center if it was changed
    osm_gps_map_map_redraw_idle(map);
}

void
osm_gps_map_clear_gps (OsmGpsMap *map)
{
    osm_gps_map_free_trip(map);
    osm_gps_map_map_redraw_idle(map);
}

coord_t
osm_gps_map_get_co_ordinates (OsmGpsMap *map, int pixel_x, int pixel_y)
{
    coord_t coord;
    OsmGpsMapPrivate *priv = map->priv;

    coord.rlat = pixel2lat(priv->map_zoom, priv->map_y + pixel_y);
    coord.rlon = pixel2lon(priv->map_zoom, priv->map_x + pixel_x);
    return coord;
}

GtkWidget *
osm_gps_map_new (void)
{
    return g_object_new (OSM_TYPE_GPS_MAP, NULL);
}

void
osm_gps_map_screen_to_geographic (OsmGpsMap *map, gint pixel_x, gint pixel_y,
                                  gfloat *latitude, gfloat *longitude)
{
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    if (latitude)
        *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
osm_gps_map_geographic_to_screen (OsmGpsMap *map,
                                  gfloat latitude, gfloat longitude,
                                  gint *pixel_x, gint *pixel_y)
{
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    if (pixel_x)
        *pixel_x = lon2pixel(priv->map_zoom, deg2rad(longitude)) - priv->map_x;
    if (pixel_y)
        *pixel_y = lat2pixel(priv->map_zoom, deg2rad(latitude)) - priv->map_y;
}

void
osm_gps_map_scroll (OsmGpsMap *map, gint dx, gint dy)
{
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    priv->center_coord_set = FALSE;
    priv->map_x += dx;
    priv->map_y += dy;

    osm_gps_map_map_redraw_idle (map);
}

float
osm_gps_map_get_scale(OsmGpsMap *map)
{
    OsmGpsMapPrivate *priv;

    g_return_val_if_fail (OSM_IS_GPS_MAP (map), OSM_NAN);
    priv = map->priv;

    return osm_gps_map_get_scale_at_point(priv->map_zoom, priv->center_rlat, priv->center_rlon);
}

#ifdef ENABLE_BALLOON
void 
osm_gps_map_draw_balloon (OsmGpsMap *map, float latitude, float longitude, 
                          OsmGpsMapBalloonCallback cb, gpointer data)
{
    OsmGpsMapPrivate *priv;

    /* remove and previously installed balloon */
    osm_gps_map_clear_balloon (map);

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    priv->balloon.coo->rlat = deg2rad(latitude);
    priv->balloon.coo->rlon = deg2rad(longitude);
    priv->balloon.valid = TRUE;

    priv->balloon.cb = cb;
    priv->balloon.data = data;

    // this redraws the map
    osm_gps_map_map_redraw_idle(map);
}

void 
osm_gps_map_clear_balloon (OsmGpsMap *map) 
{
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    priv->balloon.valid = FALSE;
    
    osm_gps_map_map_redraw_idle(map);
}
#endif

#ifdef ENABLE_OSD
void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdGpsCallback cb, gpointer data) {
    OsmGpsMapPrivate *priv;

    g_return_if_fail (OSM_IS_GPS_MAP (map));
    priv = map->priv;

    priv->osd.cb = cb;
    priv->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);

    osm_gps_map_map_redraw_idle(map);
}
#endif