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

/* -*- 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>
 *
 * 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" 
#include <stdlib.h>  // abs
#include <math.h>    // M_PI

/* parameters that can be overwritten from the config file: */
/* OSM_GPS_MAP_OSD_DIAMETER */

#ifndef USE_CAIRO
#error "OSD control display lacks a non-cairo implementation!"
#endif

#include <cairo.h>

#include "osm-gps-map.h"
#include "osm-gps-map-osd-classic.h"

//the osd controls
typedef struct {
    GdkPixmap *backup;
    gint backup_x, backup_y;
    cairo_surface_t *overlay;
} osd_priv_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);
}

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(osm_gps_map_osd_t *osd) {
    osd_priv_t *priv = (osd_priv_t*)osd->priv; 

    /* first fill with transparency */
    cairo_t *cr = cairo_create(priv->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, 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, osd->cb != NULL);
    
    cairo_destroy(cr);
}

static void
osm_gps_map_osd_draw(osm_gps_map_osd_t *osd, gint xoffset, gint yoffset)
{
    osd_priv_t *priv = (osd_priv_t*)osd->priv; 

    /* backup previous contents */
    if(!priv->backup)
        priv->backup = gdk_pixmap_new(osd->pixmap, OSD_W+2, OSD_H+2, -1);

    gint x = OSD_X + xoffset;
    gint y = OSD_Y + yoffset;

    /* create backup of background */
    gdk_draw_drawable(priv->backup, 
        osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
                      osd->pixmap, x-1, y-1, 0, 0, OSD_W+2, OSD_H+2);

    priv->backup_x = x-1;
    priv->backup_y = y-1;

    /* OSD itself uses some off-screen rendering, so check if the */
    /* offscreen buffer is present and create it if not */
    if(!priv->overlay) {
        /* create overlay ... */
        priv->overlay = 
            cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
        /* ... and render it */
        osm_gps_map_osd_render(osd);
    }

    // now draw this onto the original context 
    cairo_t *cr = gdk_cairo_create(osd->pixmap);
    cairo_set_source_surface(cr, priv->overlay, x, y);
    cairo_paint(cr);
    cairo_destroy(cr);
}

static void
osm_gps_map_osd_restore (osm_gps_map_osd_t *osd) 
{
    osd_priv_t *priv = (osd_priv_t*)osd->priv; 

    /* restore backup of previous contents */
    if(priv->backup) {
        /* create backup of background */
        gdk_draw_drawable(osd->pixmap,
                          osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
                          priv->backup, 0, 0, 
                          priv->backup_x, priv->backup_y, OSD_W+2, OSD_H+2);
    }
}

static void
osm_gps_map_osd_free(osm_gps_map_osd_t *osd) 
{
    osd_priv_t *priv = (osd_priv_t *)(osd->priv);

    if (priv->backup)
        g_object_unref(priv->backup);

    if (priv->overlay)
         cairo_surface_destroy(priv->overlay);

    g_free(priv);
}

static osm_gps_map_osd_t osd_classic = {
    .restore    = osm_gps_map_osd_restore,
    .draw       = osm_gps_map_osd_draw,
    .check      = osm_gps_map_osd_check,
    .render     = osm_gps_map_osd_render,
    .free       = osm_gps_map_osd_free,

    .cb         = NULL,
    .data       = NULL,

    .priv       = NULL
};

/* this is the only function that's externally visible */
void
osm_gps_map_osd_classic_init(OsmGpsMap *map) 
{
    osd_priv_t *priv = osd_classic.priv = g_new0(osd_priv_t, 1);

    osd_classic.priv = priv;

    osm_gps_map_register_osd(map, &osd_classic);
}


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 */
    osd->render(osd);

    osm_gps_map_redraw(map);
}
1	harbaum	71	/* -- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -- */
2			/* vim:set et sw=4 ts=4 cino=t0,(0: */
3	harbaum	70	/*
4			* Copyright (C) Till Harbaum 2009 <till@harbaum.org>
5			*
6			* osm-gps-map is free software: you can redistribute it and/or modify it
7			* under the terms of the GNU General Public License as published by the
8			* Free Software Foundation, either version 3 of the License, or
9			* (at your option) any later version.
10			*
11			* osm-gps-map is distributed in the hope that it will be useful, but
12			* WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14			* See the GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License along
17			* with this program. If not, see <http://www.gnu.org/licenses/>.
18			*/
19
20	harbaum	73	#include "config.h"
21			#include <stdlib.h> // abs
22			#include <math.h> // M_PI
23	harbaum	70
24	harbaum	71	/* parameters that can be overwritten from the config file: */
25			/* OSM_GPS_MAP_OSD_DIAMETER */
26
27			#ifndef USE_CAIRO
28			#error "OSD control display lacks a non-cairo implementation!"
29	harbaum	70	#endif
30
31	harbaum	71	#include <cairo.h>
32
33			#include "osm-gps-map.h"
34	harbaum	73	#include "osm-gps-map-osd-classic.h"
35	harbaum	71
36	harbaum	70	//the osd controls
37			typedef struct {
38			GdkPixmap *backup;
39			gint backup_x, backup_y;
40	harbaum	71	cairo_surface_t *overlay;
41	harbaum	70	} osd_priv_t;
42
43			/* position and extent of bounding box */
44			#define OSD_X (10)
45			#define OSD_Y (10)
46
47			#define OSD_COLOR 0.5, 0.5, 1
48			#define OSD_COLOR_DISABLED 0.8, 0.8, 0.8
49
50			/* parameters of the direction shape */
51			#ifndef OSM_GPS_MAP_OSD_DIAMETER
52			#define D_RAD (30) // diameter of dpad
53			#else
54			#define D_RAD (OSM_GPS_MAP_OSD_DIAMETER)
55			#endif
56			#define D_TIP (4*D_RAD/5) // distance of arrow tip from dpad center
57			#define D_LEN (D_RAD/4) // length of arrow
58			#define D_WID (D_LEN) // width of arrow
59
60			/* parameters of the "zoom" pad */
61			#define Z_STEP (D_RAD/4) // distance between dpad and zoom
62			#define Z_RAD (D_RAD/2) // radius of "caps" of zoom bar
63
64			/* shadow also depends on control size */
65			#define OSD_SHADOW (D_RAD/6)
66
67			/* total width and height of controls incl. shadow */
68			#define OSD_W (2*D_RAD + OSD_SHADOW)
69			#define OSD_H (2D_RAD + Z_STEP + 2Z_RAD + OSD_SHADOW)
70
71			#define OSD_LBL_SHADOW (OSD_SHADOW/2)
72
73			#define Z_TOP (2 * D_RAD + Z_STEP)
74			#define Z_MID (Z_TOP + Z_RAD)
75			#define Z_BOT (Z_MID + Z_RAD)
76			#define Z_LEFT (Z_RAD)
77			#define Z_RIGHT (2 * D_RAD - Z_RAD)
78
79	harbaum	71
80	harbaum	70	/* create the cairo shape used for the zoom buttons */
81			static void
82	harbaum	71	osm_gps_map_osd_zoom_shape(cairo_t *cr, gint x, gint y)
83			{
84	harbaum	70	cairo_move_to (cr, x+Z_LEFT, y+Z_TOP);
85			cairo_line_to (cr, x+Z_RIGHT, y+Z_TOP);
86			cairo_arc (cr, x+Z_RIGHT, y+Z_MID, Z_RAD, -M_PI/2, M_PI/2);
87			cairo_line_to (cr, x+Z_LEFT, y+Z_BOT);
88			cairo_arc (cr, x+Z_LEFT, y+Z_MID, Z_RAD, M_PI/2, -M_PI/2);
89			}
90
91			/* create the cairo shape used for the dpad */
92			static void
93	harbaum	71	osm_gps_map_osd_dpad_shape(cairo_t *cr, gint x, gint y)
94			{
95	harbaum	70	cairo_arc (cr, x+D_RAD, y+D_RAD, D_RAD, 0, 2 * M_PI);
96			}
97
98			static gboolean
99			osm_gps_map_in_circle(gint x, gint y, gint cx, gint cy, gint rad)
100			{
101			return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
102			}
103
104			/* check whether x/y is within the dpad */
105			static osd_button_t
106			osm_gps_map_osd_check_dpad(gint x, gint y)
107			{
108			/* within entire dpad circle */
109			if( osm_gps_map_in_circle(x, y, OSD_X + D_RAD, OSD_Y + D_RAD, D_RAD))
110			{
111			/* convert into position relative to dpads centre */
112			x -= (OSD_X + D_RAD);
113			y -= (OSD_Y + D_RAD);
114
115			/* check for dpad center goes here! */
116			if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3))
117			return OSD_GPS;
118
119			if( y < 0 && abs(x) < abs(y))
120			return OSD_UP;
121
122			if( y > 0 && abs(x) < abs(y))
123			return OSD_DOWN;
124
125			if( x < 0 && abs(y) < abs(x))
126			return OSD_LEFT;
127
128			if( x > 0 && abs(y) < abs(x))
129			return OSD_RIGHT;
130
131			return OSD_BG;
132			}
133			return OSD_NONE;
134			}
135
136			/* check whether x/y is within the zoom pads */
137			static osd_button_t
138			osm_gps_map_osd_check_zoom(gint x, gint y) {
139			if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_Y+Z_BOT)) {
140
141			/* within circle around (-) label */
142			if( osm_gps_map_in_circle(x, y, OSD_X + Z_LEFT, OSD_Y + Z_MID, Z_RAD))
143			return OSD_OUT;
144
145			/* between center of (-) button and center of entire zoom control area */
146			if(x > OSD_LEFT && x < OSD_X + D_RAD)
147			return OSD_OUT;
148
149			/* within circle around (+) label */
150			if( osm_gps_map_in_circle(x, y, OSD_X + Z_RIGHT, OSD_Y + Z_MID, Z_RAD))
151			return OSD_IN;
152
153			/* between center of (+) button and center of entire zoom control area */
154			if(x < OSD_RIGHT && x > OSD_X + D_RAD)
155			return OSD_IN;
156			}
157
158			return OSD_NONE;
159			}
160
161			static osd_button_t
162			osm_gps_map_osd_check(gint x, gint y) {
163			osd_button_t but = OSD_NONE;
164
165			/* first do a rough test for the OSD area. */
166			/* this is just to avoid an unnecessary detailed test */
167			if(x > OSD_X && x < OSD_X + OSD_W &&
168			y > OSD_Y && y < OSD_Y + OSD_H) {
169			but = osm_gps_map_osd_check_dpad(x, y);
170
171			if(but == OSD_NONE)
172			but = osm_gps_map_osd_check_zoom(x, y);
173			}
174
175			return but;
176			}
177
178			static void
179			osm_gps_map_osd_shape_shadow(cairo_t *cr) {
180			cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
181			cairo_fill (cr);
182			cairo_stroke (cr);
183			}
184
185			static void
186			osm_gps_map_osd_shape(cairo_t *cr) {
187			cairo_set_source_rgb (cr, 1, 1, 1);
188			cairo_fill_preserve (cr);
189			cairo_set_source_rgb (cr, OSD_COLOR);
190			cairo_set_line_width (cr, 1);
191			cairo_stroke (cr);
192			}
193
194			static void
195			osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
196			/* move reference to dpad center */
197			x += D_RAD;
198			y += D_RAD;
199
200			const static gint offset[][3][2] = {
201			/* left arrow/triangle */
202			{ { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
203			/* right arrow/triangle */
204			{ { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
205			/* top arrow/triangle */
206			{ { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
207			/* bottom arrow/triangle */
208			{ { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
209			};
210
211			int i;
212			for(i=0;i<4;i++) {
213			cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
214			cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
215			cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
216			}
217			}
218
219			/* draw the sattelite dish icon in the center of the dpad */
220			#define GPS_V0 (D_RAD/8)
221			#define GPS_V1 (D_RAD/10)
222			#define GPS_V2 (D_RAD/5)
223
224			/* draw a satellite receiver dish */
225			static void
226			osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
227			/* move reference to dpad center */
228			x += D_RAD;
229			y += D_RAD + GPS_V0;
230
231			cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
232			cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
233			cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
234			cairo_close_path (cr);
235
236			cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
237			cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
238			cairo_close_path (cr);
239
240			x += GPS_V1;
241			cairo_move_to (cr, x, y-GPS_V2);
242			cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
243			}
244
245			#define Z_LEN (2*Z_RAD/3)
246
247			static void
248			osm_gps_map_osd_zoom_labels(cairo_t *cr, gint x, gint y) {
249			cairo_move_to (cr, x + Z_LEFT - Z_LEN, y + Z_MID);
250			cairo_line_to (cr, x + Z_LEFT + Z_LEN, y + Z_MID);
251
252			cairo_move_to (cr, x + Z_RIGHT, y + Z_MID - Z_LEN);
253			cairo_line_to (cr, x + Z_RIGHT, y + Z_MID + Z_LEN);
254			cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
255			cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
256			}
257
258			static void
259			osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled) {
260			if(enabled) cairo_set_source_rgb (cr, OSD_COLOR);
261			else cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
262			cairo_set_line_width (cr, width);
263			cairo_stroke (cr);
264			}
265
266			static void
267			osm_gps_map_osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
268			cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
269			cairo_set_line_width (cr, width);
270			cairo_stroke (cr);
271			}
272
273			static void
274	harbaum	73	osm_gps_map_osd_render(osm_gps_map_osd_t *osd) {
275			osd_priv_t priv = (osd_priv_t)osd->priv;
276	harbaum	70
277			/* first fill with transparency */
278	harbaum	73	cairo_t *cr = cairo_create(priv->overlay);
279	harbaum	70	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
280			cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
281			cairo_paint(cr);
282
283			cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
284
285			/* --------- draw zoom and dpad shape shadow ----------- */
286			gint x = 0, y = 0;
287
288			osm_gps_map_osd_zoom_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
289			osm_gps_map_osd_shape_shadow(cr);
290			osm_gps_map_osd_dpad_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
291			osm_gps_map_osd_shape_shadow(cr);
292
293			/* --------- draw zoom and dpad shape ----------- */
294
295			osm_gps_map_osd_zoom_shape(cr, x, y);
296			osm_gps_map_osd_shape(cr);
297			osm_gps_map_osd_dpad_shape(cr, x, y);
298			osm_gps_map_osd_shape(cr);
299
300			/* --------- draw zoom and dpad labels --------- */
301
302			osm_gps_map_osd_zoom_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
303			osm_gps_map_osd_dpad_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
304			osm_gps_map_osd_labels_shadow(cr, Z_RAD/3, TRUE);
305			osm_gps_map_osd_dpad_gps(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
306	harbaum	73	osm_gps_map_osd_labels_shadow(cr, Z_RAD/6, osd->cb != NULL);
307	harbaum	70
308			osm_gps_map_osd_zoom_labels(cr, x, y);
309			osm_gps_map_osd_dpad_labels(cr, x, y);
310			osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
311			osm_gps_map_osd_dpad_gps(cr, x, y);
312	harbaum	73	osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL);
313	harbaum	70
314			cairo_destroy(cr);
315			}
316
317			static void
318	harbaum	73	osm_gps_map_osd_draw(osm_gps_map_osd_t *osd, gint xoffset, gint yoffset)
319	harbaum	70	{
320	harbaum	73	osd_priv_t priv = (osd_priv_t)osd->priv;
321	harbaum	70
322			/* backup previous contents */
323	harbaum	73	if(!priv->backup)
324			priv->backup = gdk_pixmap_new(osd->pixmap, OSD_W+2, OSD_H+2, -1);
325	harbaum	70
326	harbaum	73	gint x = OSD_X + xoffset;
327			gint y = OSD_Y + yoffset;
328	harbaum	70
329			/* create backup of background */
330	harbaum	73	gdk_draw_drawable(priv->backup,
331			osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
332			osd->pixmap, x-1, y-1, 0, 0, OSD_W+2, OSD_H+2);
333	harbaum	70
334	harbaum	73	priv->backup_x = x-1;
335			priv->backup_y = y-1;
336	harbaum	70
337			/* OSD itself uses some off-screen rendering, so check if the */
338			/* offscreen buffer is present and create it if not */
339	harbaum	73	if(!priv->overlay) {
340	harbaum	70	/* create overlay ... */
341	harbaum	73	priv->overlay =
342	harbaum	70	cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
343			/* ... and render it */
344	harbaum	73	osm_gps_map_osd_render(osd);
345	harbaum	70	}
346
347			// now draw this onto the original context
348	harbaum	73	cairo_t *cr = gdk_cairo_create(osd->pixmap);
349			cairo_set_source_surface(cr, priv->overlay, x, y);
350	harbaum	70	cairo_paint(cr);
351			cairo_destroy(cr);
352			}
353
354			static void
355	harbaum	73	osm_gps_map_osd_restore (osm_gps_map_osd_t *osd)
356	harbaum	70	{
357	harbaum	73	osd_priv_t priv = (osd_priv_t)osd->priv;
358	harbaum	70
359			/* restore backup of previous contents */
360	harbaum	73	if(priv->backup) {
361	harbaum	70	/* create backup of background */
362	harbaum	73	gdk_draw_drawable(osd->pixmap,
363			osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
364			priv->backup, 0, 0,
365			priv->backup_x, priv->backup_y, OSD_W+2, OSD_H+2);
366	harbaum	70	}
367			}
368
369	harbaum	73	static void
370			osm_gps_map_osd_free(osm_gps_map_osd_t *osd)
371	harbaum	70	{
372	harbaum	73	osd_priv_t priv = (osd_priv_t )(osd->priv);
373	harbaum	70
374	harbaum	73	if (priv->backup)
375			g_object_unref(priv->backup);
376	harbaum	70
377	harbaum	73	if (priv->overlay)
378			cairo_surface_destroy(priv->overlay);
379	harbaum	70
380	harbaum	73	g_free(priv);
381			}
382
383			static osm_gps_map_osd_t osd_classic = {
384			.restore = osm_gps_map_osd_restore,
385			.draw = osm_gps_map_osd_draw,
386			.check = osm_gps_map_osd_check,
387			.render = osm_gps_map_osd_render,
388			.free = osm_gps_map_osd_free,
389
390			.cb = NULL,
391			.data = NULL,
392
393			.priv = NULL
394			};
395
396			/* this is the only function that's externally visible */
397			void
398			osm_gps_map_osd_classic_init(OsmGpsMap *map)
399			{
400			osd_priv_t *priv = osd_classic.priv = g_new0(osd_priv_t, 1);
401
402			osd_classic.priv = priv;
403
404			osm_gps_map_register_osd(map, &osd_classic);
405			}
406
407
408			void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb, gpointer data) {
409			osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
410
411			g_return_if_fail (osd);
412
413			osd->cb = cb;
414			osd->data = data;
415
416	harbaum	70	/* this may have changed the state of the gps button */
417			/* we thus re-render the overlay */
418	harbaum	73	osd->render(osd);
419	harbaum	70
420	harbaum	73	osm_gps_map_redraw(map);
421	harbaum	70	}