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 {
    /* the offscreen representation of the OSD */
    cairo_surface_t *overlay;

    GdkColor bg, fg, da;

} osd_priv_t;

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

/* 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

#ifdef OSD_SHADOW_ENABLE
/* shadow also depends on control size */
#define OSD_SHADOW (D_RAD/6)
#else
#define OSD_SHADOW (0)
#endif

/* 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)

#ifdef OSD_SHADOW_ENABLE
#define OSD_LBL_SHADOW (OSD_SHADOW/2)
#endif

#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;
}

#ifdef OSD_SHADOW_ENABLE
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);
}
#endif

#ifndef OSD_COLOR
/* if no color has been specified we just use the gdks default colors */
static void 
osm_gps_map_osd_shape(cairo_t *cr, GdkColor *bg, GdkColor *fg) {
    gdk_cairo_set_source_color(cr, bg);
    cairo_fill_preserve (cr);
    gdk_cairo_set_source_color(cr, fg);
    cairo_set_line_width (cr, 1);
    cairo_stroke (cr);
}
#else
static void 
osm_gps_map_osd_shape(cairo_t *cr) {
    cairo_set_source_rgb (cr, OSD_COLOR_BG);
    cairo_fill_preserve (cr);
    cairo_set_source_rgb (cr, OSD_COLOR);
    cairo_set_line_width (cr, 1);
    cairo_stroke (cr);
}
#endif

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);
}

#ifndef OSD_COLOR
/* if no color has been specified we just use the gdks default colors */
static void
osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled,
                       GdkColor *fg, GdkColor *disabled) {
    if(enabled)  gdk_cairo_set_source_color(cr, fg);
    else         gdk_cairo_set_source_color(cr, disabled);
    cairo_set_line_width (cr, width);
    cairo_stroke (cr);
}
#else
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);
}
#endif

#ifdef OSD_SHADOW_ENABLE
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);
}
#endif

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;

#ifdef OSD_SHADOW_ENABLE
    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);
#endif

    /* --------- draw zoom and dpad shape ----------- */

    osm_gps_map_osd_zoom_shape(cr, x, y);
#ifndef OSD_COLOR
    osm_gps_map_osd_shape(cr, &priv->bg, &priv->fg);
#else
    osm_gps_map_osd_shape(cr);
#endif
    osm_gps_map_osd_dpad_shape(cr, x, y);
#ifndef OSD_COLOR
    osm_gps_map_osd_shape(cr, &priv->bg, &priv->fg);
#else
    osm_gps_map_osd_shape(cr);
#endif

    /* --------- draw zoom and dpad labels --------- */

#ifdef OSD_SHADOW_ENABLE
    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);
#endif

    osm_gps_map_osd_zoom_labels(cr, x, y);
    osm_gps_map_osd_dpad_labels(cr, x, y);
#ifndef OSD_COLOR
    osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE, &priv->fg, &priv->da);
#else
    osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
#endif
    osm_gps_map_osd_dpad_gps(cr, x, y);
#ifndef OSD_COLOR
    osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL, &priv->fg, &priv->da);
#else
    osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL);
#endif
    
    cairo_destroy(cr);
}

static void
osm_gps_map_osd_draw(osm_gps_map_osd_t *osd, GdkDrawable *drawable)
{
    osd_priv_t *priv = (osd_priv_t*)osd->priv; 

    /* 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(drawable);
    cairo_set_source_surface(cr, priv->overlay, OSD_X, OSD_Y);
    cairo_paint(cr);
    cairo_destroy(cr);
}

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

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

    g_free(priv);
}

static osm_gps_map_osd_t osd_classic = {
    .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;

    /* extract style info from the widget */
    priv->bg = GTK_WIDGET(map)->style->bg[GTK_STATE_NORMAL];
    priv->fg = GTK_WIDGET(map)->style->fg[GTK_STATE_NORMAL];
    priv->da = GTK_WIDGET(map)->style->fg[GTK_STATE_INSENSITIVE];

    osm_gps_map_register_osd(map, &osd_classic);
}


/* below are osd specific functions which aren't used by osm-gps-map */
/* but instead are to be used by the main application */
void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb, gpointer data) {
    osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);

    g_return_if_fail (osd);

    osd->cb = cb;
    osd->data = data;

    /* this may have changed the state of the gps button */
    /* we thus re-render the overlay */
    osd->render(osd);

    osm_gps_map_redraw(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	#include <stdlib.h> // abs
22	#include <math.h> // M_PI
23
24	/* 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	#endif
30
31	#include <cairo.h>
32
33	#include "osm-gps-map.h"
34	#include "osm-gps-map-osd-classic.h"
35
36	//the osd controls
37	typedef struct {
38	/* the offscreen representation of the OSD */
39	cairo_surface_t *overlay;
40
41	GdkColor bg, fg, da;
42
43	} osd_priv_t;
44
45	/* position and extent of bounding box */
46	#define OSD_X (10)
47	#define OSD_Y (10)
48
49	/* parameters of the direction shape */
50	#ifndef OSM_GPS_MAP_OSD_DIAMETER
51	#define D_RAD (30) // diameter of dpad
52	#else
53	#define D_RAD (OSM_GPS_MAP_OSD_DIAMETER)
54	#endif
55	#define D_TIP (4*D_RAD/5) // distance of arrow tip from dpad center
56	#define D_LEN (D_RAD/4) // length of arrow
57	#define D_WID (D_LEN) // width of arrow
58
59	/* parameters of the "zoom" pad */
60	#define Z_STEP (D_RAD/4) // distance between dpad and zoom
61	#define Z_RAD (D_RAD/2) // radius of "caps" of zoom bar
62
63	#ifdef OSD_SHADOW_ENABLE
64	/* shadow also depends on control size */
65	#define OSD_SHADOW (D_RAD/6)
66	#else
67	#define OSD_SHADOW (0)
68	#endif
69
70	/* total width and height of controls incl. shadow */
71	#define OSD_W (2*D_RAD + OSD_SHADOW)
72	#define OSD_H (2D_RAD + Z_STEP + 2Z_RAD + OSD_SHADOW)
73
74	#ifdef OSD_SHADOW_ENABLE
75	#define OSD_LBL_SHADOW (OSD_SHADOW/2)
76	#endif
77
78	#define Z_TOP (2 * D_RAD + Z_STEP)
79	#define Z_MID (Z_TOP + Z_RAD)
80	#define Z_BOT (Z_MID + Z_RAD)
81	#define Z_LEFT (Z_RAD)
82	#define Z_RIGHT (2 * D_RAD - Z_RAD)
83
84
85	/* create the cairo shape used for the zoom buttons */
86	static void
87	osm_gps_map_osd_zoom_shape(cairo_t *cr, gint x, gint y)
88	{
89	cairo_move_to (cr, x+Z_LEFT, y+Z_TOP);
90	cairo_line_to (cr, x+Z_RIGHT, y+Z_TOP);
91	cairo_arc (cr, x+Z_RIGHT, y+Z_MID, Z_RAD, -M_PI/2, M_PI/2);
92	cairo_line_to (cr, x+Z_LEFT, y+Z_BOT);
93	cairo_arc (cr, x+Z_LEFT, y+Z_MID, Z_RAD, M_PI/2, -M_PI/2);
94	}
95
96	/* create the cairo shape used for the dpad */
97	static void
98	osm_gps_map_osd_dpad_shape(cairo_t *cr, gint x, gint y)
99	{
100	cairo_arc (cr, x+D_RAD, y+D_RAD, D_RAD, 0, 2 * M_PI);
101	}
102
103	static gboolean
104	osm_gps_map_in_circle(gint x, gint y, gint cx, gint cy, gint rad)
105	{
106	return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
107	}
108
109	/* check whether x/y is within the dpad */
110	static osd_button_t
111	osm_gps_map_osd_check_dpad(gint x, gint y)
112	{
113	/* within entire dpad circle */
114	if( osm_gps_map_in_circle(x, y, OSD_X + D_RAD, OSD_Y + D_RAD, D_RAD))
115	{
116	/* convert into position relative to dpads centre */
117	x -= (OSD_X + D_RAD);
118	y -= (OSD_Y + D_RAD);
119
120	/* check for dpad center goes here! */
121	if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3))
122	return OSD_GPS;
123
124	if( y < 0 && abs(x) < abs(y))
125	return OSD_UP;
126
127	if( y > 0 && abs(x) < abs(y))
128	return OSD_DOWN;
129
130	if( x < 0 && abs(y) < abs(x))
131	return OSD_LEFT;
132
133	if( x > 0 && abs(y) < abs(x))
134	return OSD_RIGHT;
135
136	return OSD_BG;
137	}
138	return OSD_NONE;
139	}
140
141	/* check whether x/y is within the zoom pads */
142	static osd_button_t
143	osm_gps_map_osd_check_zoom(gint x, gint y) {
144	if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_Y+Z_BOT)) {
145
146	/* within circle around (-) label */
147	if( osm_gps_map_in_circle(x, y, OSD_X + Z_LEFT, OSD_Y + Z_MID, Z_RAD))
148	return OSD_OUT;
149
150	/* between center of (-) button and center of entire zoom control area */
151	if(x > OSD_LEFT && x < OSD_X + D_RAD)
152	return OSD_OUT;
153
154	/* within circle around (+) label */
155	if( osm_gps_map_in_circle(x, y, OSD_X + Z_RIGHT, OSD_Y + Z_MID, Z_RAD))
156	return OSD_IN;
157
158	/* between center of (+) button and center of entire zoom control area */
159	if(x < OSD_RIGHT && x > OSD_X + D_RAD)
160	return OSD_IN;
161	}
162
163	return OSD_NONE;
164	}
165
166	static osd_button_t
167	osm_gps_map_osd_check(gint x, gint y) {
168	osd_button_t but = OSD_NONE;
169
170	/* first do a rough test for the OSD area. */
171	/* this is just to avoid an unnecessary detailed test */
172	if(x > OSD_X && x < OSD_X + OSD_W &&
173	y > OSD_Y && y < OSD_Y + OSD_H) {
174	but = osm_gps_map_osd_check_dpad(x, y);
175
176	if(but == OSD_NONE)
177	but = osm_gps_map_osd_check_zoom(x, y);
178	}
179
180	return but;
181	}
182
183	#ifdef OSD_SHADOW_ENABLE
184	static void
185	osm_gps_map_osd_shape_shadow(cairo_t *cr) {
186	cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
187	cairo_fill (cr);
188	cairo_stroke (cr);
189	}
190	#endif
191
192	#ifndef OSD_COLOR
193	/* if no color has been specified we just use the gdks default colors */
194	static void
195	osm_gps_map_osd_shape(cairo_t cr, GdkColor bg, GdkColor *fg) {
196	gdk_cairo_set_source_color(cr, bg);
197	cairo_fill_preserve (cr);
198	gdk_cairo_set_source_color(cr, fg);
199	cairo_set_line_width (cr, 1);
200	cairo_stroke (cr);
201	}
202	#else
203	static void
204	osm_gps_map_osd_shape(cairo_t *cr) {
205	cairo_set_source_rgb (cr, OSD_COLOR_BG);
206	cairo_fill_preserve (cr);
207	cairo_set_source_rgb (cr, OSD_COLOR);
208	cairo_set_line_width (cr, 1);
209	cairo_stroke (cr);
210	}
211	#endif
212
213	static void
214	osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
215	/* move reference to dpad center */
216	x += D_RAD;
217	y += D_RAD;
218
219	const static gint offset[][3][2] = {
220	/* left arrow/triangle */
221	{ { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
222	/* right arrow/triangle */
223	{ { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
224	/* top arrow/triangle */
225	{ { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
226	/* bottom arrow/triangle */
227	{ { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
228	};
229
230	int i;
231	for(i=0;i<4;i++) {
232	cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
233	cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
234	cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
235	}
236	}
237
238	/* draw the sattelite dish icon in the center of the dpad */
239	#define GPS_V0 (D_RAD/8)
240	#define GPS_V1 (D_RAD/10)
241	#define GPS_V2 (D_RAD/5)
242
243	/* draw a satellite receiver dish */
244	static void
245	osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
246	/* move reference to dpad center */
247	x += D_RAD;
248	y += D_RAD + GPS_V0;
249
250	cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
251	cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
252	cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
253	cairo_close_path (cr);
254
255	cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
256	cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
257	cairo_close_path (cr);
258
259	x += GPS_V1;
260	cairo_move_to (cr, x, y-GPS_V2);
261	cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
262	}
263
264	#define Z_LEN (2*Z_RAD/3)
265
266	static void
267	osm_gps_map_osd_zoom_labels(cairo_t *cr, gint x, gint y) {
268	cairo_move_to (cr, x + Z_LEFT - Z_LEN, y + Z_MID);
269	cairo_line_to (cr, x + Z_LEFT + Z_LEN, y + Z_MID);
270
271	cairo_move_to (cr, x + Z_RIGHT, y + Z_MID - Z_LEN);
272	cairo_line_to (cr, x + Z_RIGHT, y + Z_MID + Z_LEN);
273	cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
274	cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
275	}
276
277	#ifndef OSD_COLOR
278	/* if no color has been specified we just use the gdks default colors */
279	static void
280	osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled,
281	GdkColor fg, GdkColor disabled) {
282	if(enabled) gdk_cairo_set_source_color(cr, fg);
283	else gdk_cairo_set_source_color(cr, disabled);
284	cairo_set_line_width (cr, width);
285	cairo_stroke (cr);
286	}
287	#else
288	static void
289	osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled) {
290	if(enabled) cairo_set_source_rgb (cr, OSD_COLOR);
291	else cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
292	cairo_set_line_width (cr, width);
293	cairo_stroke (cr);
294	}
295	#endif
296
297	#ifdef OSD_SHADOW_ENABLE
298	static void
299	osm_gps_map_osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
300	cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
301	cairo_set_line_width (cr, width);
302	cairo_stroke (cr);
303	}
304	#endif
305
306	static void
307	osm_gps_map_osd_render(osm_gps_map_osd_t *osd) {
308	osd_priv_t priv = (osd_priv_t)osd->priv;
309
310	/* first fill with transparency */
311	cairo_t *cr = cairo_create(priv->overlay);
312	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
313	cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
314	cairo_paint(cr);
315
316	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
317
318	/* --------- draw zoom and dpad shape shadow ----------- */
319	gint x = 0, y = 0;
320
321	#ifdef OSD_SHADOW_ENABLE
322	osm_gps_map_osd_zoom_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
323	osm_gps_map_osd_shape_shadow(cr);
324	osm_gps_map_osd_dpad_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
325	osm_gps_map_osd_shape_shadow(cr);
326	#endif
327
328	/* --------- draw zoom and dpad shape ----------- */
329
330	osm_gps_map_osd_zoom_shape(cr, x, y);
331	#ifndef OSD_COLOR
332	osm_gps_map_osd_shape(cr, &priv->bg, &priv->fg);
333	#else
334	osm_gps_map_osd_shape(cr);
335	#endif
336	osm_gps_map_osd_dpad_shape(cr, x, y);
337	#ifndef OSD_COLOR
338	osm_gps_map_osd_shape(cr, &priv->bg, &priv->fg);
339	#else
340	osm_gps_map_osd_shape(cr);
341	#endif
342
343	/* --------- draw zoom and dpad labels --------- */
344
345	#ifdef OSD_SHADOW_ENABLE
346	osm_gps_map_osd_zoom_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
347	osm_gps_map_osd_dpad_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
348	osm_gps_map_osd_labels_shadow(cr, Z_RAD/3, TRUE);
349	osm_gps_map_osd_dpad_gps(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
350	osm_gps_map_osd_labels_shadow(cr, Z_RAD/6, osd->cb != NULL);
351	#endif
352
353	osm_gps_map_osd_zoom_labels(cr, x, y);
354	osm_gps_map_osd_dpad_labels(cr, x, y);
355	#ifndef OSD_COLOR
356	osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE, &priv->fg, &priv->da);
357	#else
358	osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
359	#endif
360	osm_gps_map_osd_dpad_gps(cr, x, y);
361	#ifndef OSD_COLOR
362	osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL, &priv->fg, &priv->da);
363	#else
364	osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL);
365	#endif
366
367	cairo_destroy(cr);
368	}
369
370	static void
371	osm_gps_map_osd_draw(osm_gps_map_osd_t osd, GdkDrawable drawable)
372	{
373	osd_priv_t priv = (osd_priv_t)osd->priv;
374
375	/* OSD itself uses some off-screen rendering, so check if the */
376	/* offscreen buffer is present and create it if not */
377	if(!priv->overlay) {
378	/* create overlay ... */
379	priv->overlay =
380	cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
381	/* ... and render it */
382	osm_gps_map_osd_render(osd);
383	}
384
385	// now draw this onto the original context
386	cairo_t *cr = gdk_cairo_create(drawable);
387	cairo_set_source_surface(cr, priv->overlay, OSD_X, OSD_Y);
388	cairo_paint(cr);
389	cairo_destroy(cr);
390	}
391
392	static void
393	osm_gps_map_osd_free(osm_gps_map_osd_t *osd)
394	{
395	osd_priv_t priv = (osd_priv_t )(osd->priv);
396
397	if (priv->overlay)
398	cairo_surface_destroy(priv->overlay);
399
400	g_free(priv);
401	}
402
403	static osm_gps_map_osd_t osd_classic = {
404	.draw = osm_gps_map_osd_draw,
405	.check = osm_gps_map_osd_check,
406	.render = osm_gps_map_osd_render,
407	.free = osm_gps_map_osd_free,
408
409	.cb = NULL,
410	.data = NULL,
411
412	.priv = NULL
413	};
414
415	/* this is the only function that's externally visible */
416	void
417	osm_gps_map_osd_classic_init(OsmGpsMap *map)
418	{
419	osd_priv_t *priv = osd_classic.priv = g_new0(osd_priv_t, 1);
420
421	osd_classic.priv = priv;
422
423	/* extract style info from the widget */
424	priv->bg = GTK_WIDGET(map)->style->bg[GTK_STATE_NORMAL];
425	priv->fg = GTK_WIDGET(map)->style->fg[GTK_STATE_NORMAL];
426	priv->da = GTK_WIDGET(map)->style->fg[GTK_STATE_INSENSITIVE];
427
428	osm_gps_map_register_osd(map, &osd_classic);
429	}
430
431
432	/* below are osd specific functions which aren't used by osm-gps-map */
433	/* but instead are to be used by the main application */
434	void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb, gpointer data) {
435	osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
436
437	g_return_if_fail (osd);
438
439	osd->cb = cb;
440	osd->data = data;
441
442	/* this may have changed the state of the gps button */
443	/* we thus re-render the overlay */
444	osd->render(osd);
445
446	osm_gps_map_redraw(map);
447	}