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"

/* 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"

//the osd controls
typedef struct {
    GdkPixmap *backup;
    gint backup_x, backup_y;

    cairo_surface_t *overlay;

    OsmGpsMapOsdGpsCallback cb;
    gpointer data;
} osd_priv_t;

/* the osd structure mainly contains various callbacks */
/* required to draw and update the OSD */
typedef struct {

    void(enable_gps)(OsmGpsMap *, OsmGpsMapOsdGpsCallback, gpointer);
    void(restore)(OsmGpsMap*);
    void(draw)(OsmGpsMap *, gint, gint);
    void(render)(OsmGpsMapPrivate *);
    osd_button_t(*check)(gint, gint);       /* check if x/y lies within OSD */
    void(free)(gpointer);

    gpointer priv;
} osm_gps_map_osd_t;

static osm_gps_map_osd_t osd_classic = {
    .restore    = osm_gps_map_osd_restore,
    .draw       = osm_gps_map_osd_draw_controls,
    .check      = osm_gps_map_osd_check,
    .render     = osm_gps_map_osd_render,
    .enable_gps = osm_gps_map_osd_enable_gps,
    .free       = osm_gps_map_osd_free,
    .priv       = NULL;
}

/* this is the only function that's externally visible */
osm_gps_map_osd_t *
osm_gps_map_osd_classic_init(void) 
{
    return osd_classic;
}

static void
osm_gps_map_osd_free(gpointer priv_ptr) 
{
    osd_priv_t *priv = (osd_priv_t *)priv_ptr;


    g_free(priv);
}

/* 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(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;

    /* 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);
}

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);
    }
}

static 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);
}
1	/* -- 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	/*
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	#include "config.h"
21
22	/* parameters that can be overwritten from the config file: */
23	/* OSM_GPS_MAP_OSD_DIAMETER */
24
25	#ifndef USE_CAIRO
26	#error "OSD control display lacks a non-cairo implementation!"
27	#endif
28
29	#include <cairo.h>
30
31	#include "osm-gps-map.h"
32
33	//the osd controls
34	typedef struct {
35	GdkPixmap *backup;
36	gint backup_x, backup_y;
37
38	cairo_surface_t *overlay;
39
40	OsmGpsMapOsdGpsCallback cb;
41	gpointer data;
42	} osd_priv_t;
43
44	/* the osd structure mainly contains various callbacks */
45	/* required to draw and update the OSD */
46	typedef struct {
47
48	void(enable_gps)(OsmGpsMap *, OsmGpsMapOsdGpsCallback, gpointer);
49	void(restore)(OsmGpsMap*);
50	void(draw)(OsmGpsMap *, gint, gint);
51	void(render)(OsmGpsMapPrivate *);
52	osd_button_t(check)(gint, gint); / check if x/y lies within OSD */
53	void(free)(gpointer);
54
55	gpointer priv;
56	} osm_gps_map_osd_t;
57
58	static osm_gps_map_osd_t osd_classic = {
59	.restore = osm_gps_map_osd_restore,
60	.draw = osm_gps_map_osd_draw_controls,
61	.check = osm_gps_map_osd_check,
62	.render = osm_gps_map_osd_render,
63	.enable_gps = osm_gps_map_osd_enable_gps,
64	.free = osm_gps_map_osd_free,
65	.priv = NULL;
66	}
67
68	/* this is the only function that's externally visible */
69	osm_gps_map_osd_t *
70	osm_gps_map_osd_classic_init(void)
71	{
72	return osd_classic;
73	}
74
75	static void
76	osm_gps_map_osd_free(gpointer priv_ptr)
77	{
78	osd_priv_t priv = (osd_priv_t )priv_ptr;
79
80
81	g_free(priv);
82	}
83
84	/* position and extent of bounding box */
85	#define OSD_X (10)
86	#define OSD_Y (10)
87
88	#define OSD_COLOR 0.5, 0.5, 1
89	#define OSD_COLOR_DISABLED 0.8, 0.8, 0.8
90
91	/* parameters of the direction shape */
92	#ifndef OSM_GPS_MAP_OSD_DIAMETER
93	#define D_RAD (30) // diameter of dpad
94	#else
95	#define D_RAD (OSM_GPS_MAP_OSD_DIAMETER)
96	#endif
97	#define D_TIP (4*D_RAD/5) // distance of arrow tip from dpad center
98	#define D_LEN (D_RAD/4) // length of arrow
99	#define D_WID (D_LEN) // width of arrow
100
101	/* parameters of the "zoom" pad */
102	#define Z_STEP (D_RAD/4) // distance between dpad and zoom
103	#define Z_RAD (D_RAD/2) // radius of "caps" of zoom bar
104
105	/* shadow also depends on control size */
106	#define OSD_SHADOW (D_RAD/6)
107
108	/* total width and height of controls incl. shadow */
109	#define OSD_W (2*D_RAD + OSD_SHADOW)
110	#define OSD_H (2D_RAD + Z_STEP + 2Z_RAD + OSD_SHADOW)
111
112	#define OSD_LBL_SHADOW (OSD_SHADOW/2)
113
114	#define Z_TOP (2 * D_RAD + Z_STEP)
115	#define Z_MID (Z_TOP + Z_RAD)
116	#define Z_BOT (Z_MID + Z_RAD)
117	#define Z_LEFT (Z_RAD)
118	#define Z_RIGHT (2 * D_RAD - Z_RAD)
119
120
121	/* create the cairo shape used for the zoom buttons */
122	static void
123	osm_gps_map_osd_zoom_shape(cairo_t *cr, gint x, gint y)
124	{
125	cairo_move_to (cr, x+Z_LEFT, y+Z_TOP);
126	cairo_line_to (cr, x+Z_RIGHT, y+Z_TOP);
127	cairo_arc (cr, x+Z_RIGHT, y+Z_MID, Z_RAD, -M_PI/2, M_PI/2);
128	cairo_line_to (cr, x+Z_LEFT, y+Z_BOT);
129	cairo_arc (cr, x+Z_LEFT, y+Z_MID, Z_RAD, M_PI/2, -M_PI/2);
130	}
131
132	/* create the cairo shape used for the dpad */
133	static void
134	osm_gps_map_osd_dpad_shape(cairo_t *cr, gint x, gint y)
135	{
136	cairo_arc (cr, x+D_RAD, y+D_RAD, D_RAD, 0, 2 * M_PI);
137	}
138
139	static gboolean
140	osm_gps_map_in_circle(gint x, gint y, gint cx, gint cy, gint rad)
141	{
142	return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
143	}
144
145	/* check whether x/y is within the dpad */
146	static osd_button_t
147	osm_gps_map_osd_check_dpad(gint x, gint y)
148	{
149	/* within entire dpad circle */
150	if( osm_gps_map_in_circle(x, y, OSD_X + D_RAD, OSD_Y + D_RAD, D_RAD))
151	{
152	/* convert into position relative to dpads centre */
153	x -= (OSD_X + D_RAD);
154	y -= (OSD_Y + D_RAD);
155
156	/* check for dpad center goes here! */
157	if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3))
158	return OSD_GPS;
159
160	if( y < 0 && abs(x) < abs(y))
161	return OSD_UP;
162
163	if( y > 0 && abs(x) < abs(y))
164	return OSD_DOWN;
165
166	if( x < 0 && abs(y) < abs(x))
167	return OSD_LEFT;
168
169	if( x > 0 && abs(y) < abs(x))
170	return OSD_RIGHT;
171
172	return OSD_BG;
173	}
174	return OSD_NONE;
175	}
176
177	/* check whether x/y is within the zoom pads */
178	static osd_button_t
179	osm_gps_map_osd_check_zoom(gint x, gint y) {
180	if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_Y+Z_BOT)) {
181
182	/* within circle around (-) label */
183	if( osm_gps_map_in_circle(x, y, OSD_X + Z_LEFT, OSD_Y + Z_MID, Z_RAD))
184	return OSD_OUT;
185
186	/* between center of (-) button and center of entire zoom control area */
187	if(x > OSD_LEFT && x < OSD_X + D_RAD)
188	return OSD_OUT;
189
190	/* within circle around (+) label */
191	if( osm_gps_map_in_circle(x, y, OSD_X + Z_RIGHT, OSD_Y + Z_MID, Z_RAD))
192	return OSD_IN;
193
194	/* between center of (+) button and center of entire zoom control area */
195	if(x < OSD_RIGHT && x > OSD_X + D_RAD)
196	return OSD_IN;
197	}
198
199	return OSD_NONE;
200	}
201
202	static osd_button_t
203	osm_gps_map_osd_check(gint x, gint y) {
204	osd_button_t but = OSD_NONE;
205
206	/* first do a rough test for the OSD area. */
207	/* this is just to avoid an unnecessary detailed test */
208	if(x > OSD_X && x < OSD_X + OSD_W &&
209	y > OSD_Y && y < OSD_Y + OSD_H) {
210	but = osm_gps_map_osd_check_dpad(x, y);
211
212	if(but == OSD_NONE)
213	but = osm_gps_map_osd_check_zoom(x, y);
214	}
215
216	return but;
217	}
218
219	static void
220	osm_gps_map_osd_shape_shadow(cairo_t *cr) {
221	cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
222	cairo_fill (cr);
223	cairo_stroke (cr);
224	}
225
226	static void
227	osm_gps_map_osd_shape(cairo_t *cr) {
228	cairo_set_source_rgb (cr, 1, 1, 1);
229	cairo_fill_preserve (cr);
230	cairo_set_source_rgb (cr, OSD_COLOR);
231	cairo_set_line_width (cr, 1);
232	cairo_stroke (cr);
233	}
234
235	static void
236	osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
237	/* move reference to dpad center */
238	x += D_RAD;
239	y += D_RAD;
240
241	const static gint offset[][3][2] = {
242	/* left arrow/triangle */
243	{ { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
244	/* right arrow/triangle */
245	{ { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
246	/* top arrow/triangle */
247	{ { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
248	/* bottom arrow/triangle */
249	{ { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
250	};
251
252	int i;
253	for(i=0;i<4;i++) {
254	cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
255	cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
256	cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
257	}
258	}
259
260	/* draw the sattelite dish icon in the center of the dpad */
261	#define GPS_V0 (D_RAD/8)
262	#define GPS_V1 (D_RAD/10)
263	#define GPS_V2 (D_RAD/5)
264
265	/* draw a satellite receiver dish */
266	static void
267	osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
268	/* move reference to dpad center */
269	x += D_RAD;
270	y += D_RAD + GPS_V0;
271
272	cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
273	cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
274	cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
275	cairo_close_path (cr);
276
277	cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
278	cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
279	cairo_close_path (cr);
280
281	x += GPS_V1;
282	cairo_move_to (cr, x, y-GPS_V2);
283	cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
284	}
285
286	#define Z_LEN (2*Z_RAD/3)
287
288	static void
289	osm_gps_map_osd_zoom_labels(cairo_t *cr, gint x, gint y) {
290	cairo_move_to (cr, x + Z_LEFT - Z_LEN, y + Z_MID);
291	cairo_line_to (cr, x + Z_LEFT + Z_LEN, y + Z_MID);
292
293	cairo_move_to (cr, x + Z_RIGHT, y + Z_MID - Z_LEN);
294	cairo_line_to (cr, x + Z_RIGHT, y + Z_MID + Z_LEN);
295	cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
296	cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
297	}
298
299	static void
300	osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled) {
301	if(enabled) cairo_set_source_rgb (cr, OSD_COLOR);
302	else cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
303	cairo_set_line_width (cr, width);
304	cairo_stroke (cr);
305	}
306
307	static void
308	osm_gps_map_osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
309	cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
310	cairo_set_line_width (cr, width);
311	cairo_stroke (cr);
312	}
313
314	static void
315	osm_gps_map_osd_render(OsmGpsMapPrivate *priv) {
316
317	/* first fill with transparency */
318	cairo_t *cr = cairo_create(priv->osd.overlay);
319	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
320	cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
321	cairo_paint(cr);
322
323	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
324
325	/* --------- draw zoom and dpad shape shadow ----------- */
326	gint x = 0, y = 0;
327
328	osm_gps_map_osd_zoom_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
329	osm_gps_map_osd_shape_shadow(cr);
330	osm_gps_map_osd_dpad_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
331	osm_gps_map_osd_shape_shadow(cr);
332
333	/* --------- draw zoom and dpad shape ----------- */
334
335	osm_gps_map_osd_zoom_shape(cr, x, y);
336	osm_gps_map_osd_shape(cr);
337	osm_gps_map_osd_dpad_shape(cr, x, y);
338	osm_gps_map_osd_shape(cr);
339
340	/* --------- draw zoom and dpad labels --------- */
341
342	osm_gps_map_osd_zoom_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
343	osm_gps_map_osd_dpad_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
344	osm_gps_map_osd_labels_shadow(cr, Z_RAD/3, TRUE);
345	osm_gps_map_osd_dpad_gps(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
346	osm_gps_map_osd_labels_shadow(cr, Z_RAD/6, priv->osd.cb != NULL);
347
348	osm_gps_map_osd_zoom_labels(cr, x, y);
349	osm_gps_map_osd_dpad_labels(cr, x, y);
350	osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
351	osm_gps_map_osd_dpad_gps(cr, x, y);
352	osm_gps_map_osd_labels(cr, Z_RAD/6, priv->osd.cb != NULL);
353
354	cairo_destroy(cr);
355	}
356
357	static void
358	osm_gps_map_osd_draw_controls (OsmGpsMap *map, gint xoffset, gint yoffset)
359	{
360	OsmGpsMapPrivate *priv = map->priv;
361
362	/* backup previous contents */
363	if(!priv->osd.backup)
364	priv->osd.backup = gdk_pixmap_new(priv->pixmap, OSD_W+2, OSD_H+2, -1);
365
366	gint x = OSD_X + EXTRA_BORDER + xoffset;
367	gint y = OSD_Y + EXTRA_BORDER + yoffset;
368
369	/* create backup of background */
370	gdk_draw_drawable(priv->osd.backup,
371	GTK_WIDGET(map)->style->fg_gc[GTK_WIDGET_STATE(GTK_WIDGET(map))],
372	priv->pixmap, x-1, y-1, 0, 0, OSD_W+2, OSD_H+2);
373
374	priv->osd.backup_x = x-1;
375	priv->osd.backup_y = y-1;
376
377	/* OSD itself uses some off-screen rendering, so check if the */
378	/* offscreen buffer is present and create it if not */
379	if(!priv->osd.overlay) {
380	/* create overlay ... */
381	priv->osd.overlay =
382	cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
383	/* ... and render it */
384	osm_gps_map_osd_render(priv);
385	}
386
387	// now draw this onto the original context
388	cairo_t *cr = gdk_cairo_create(priv->pixmap);
389	cairo_set_source_surface(cr, priv->osd.overlay, x, y);
390	cairo_paint(cr);
391	cairo_destroy(cr);
392	}
393
394	static void
395	osm_gps_map_osd_restore (OsmGpsMap *map)
396	{
397	OsmGpsMapPrivate *priv = map->priv;
398
399	/* restore backup of previous contents */
400	if(priv->osd.backup) {
401	/* create backup of background */
402	gdk_draw_drawable(priv->pixmap,
403	GTK_WIDGET(map)->style->fg_gc[GTK_WIDGET_STATE(GTK_WIDGET(map))],
404	priv->osd.backup, 0, 0,
405	priv->osd.backup_x, priv->osd.backup_y, OSD_W+2, OSD_H+2);
406	}
407	}
408
409	static void
410	osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdGpsCallback cb, gpointer data)
411	{
412	OsmGpsMapPrivate *priv;
413
414	g_return_if_fail (OSM_IS_GPS_MAP (map));
415	priv = map->priv;
416
417	priv->osd.cb = cb;
418	priv->osd.data = data;
419
420	/* this may have changed the state of the gps button */
421	/* we thus re-render the overlay */
422	osm_gps_map_osd_render(priv);
423
424	osm_gps_map_map_redraw_idle(map);
425	}