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;

    /* stuff required to restore the original map content */
    GdkPixmap *backup;
    gint backup_x, backup_y;

    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, 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;

    /* 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	/* stuff required to restore the original map content */
42	GdkPixmap *backup;
43	gint backup_x, backup_y;
44
45	GdkColor bg, fg, da;
46
47	} osd_priv_t;
48
49	/* position and extent of bounding box */
50	#define OSD_X (10)
51	#define OSD_Y (10)
52
53	/* parameters of the direction shape */
54	#ifndef OSM_GPS_MAP_OSD_DIAMETER
55	#define D_RAD (30) // diameter of dpad
56	#else
57	#define D_RAD (OSM_GPS_MAP_OSD_DIAMETER)
58	#endif
59	#define D_TIP (4*D_RAD/5) // distance of arrow tip from dpad center
60	#define D_LEN (D_RAD/4) // length of arrow
61	#define D_WID (D_LEN) // width of arrow
62
63	/* parameters of the "zoom" pad */
64	#define Z_STEP (D_RAD/4) // distance between dpad and zoom
65	#define Z_RAD (D_RAD/2) // radius of "caps" of zoom bar
66
67	#ifdef OSD_SHADOW_ENABLE
68	/* shadow also depends on control size */
69	#define OSD_SHADOW (D_RAD/6)
70	#else
71	#define OSD_SHADOW (0)
72	#endif
73
74	/* total width and height of controls incl. shadow */
75	#define OSD_W (2*D_RAD + OSD_SHADOW)
76	#define OSD_H (2D_RAD + Z_STEP + 2Z_RAD + OSD_SHADOW)
77
78	#ifdef OSD_SHADOW_ENABLE
79	#define OSD_LBL_SHADOW (OSD_SHADOW/2)
80	#endif
81
82	#define Z_TOP (2 * D_RAD + Z_STEP)
83	#define Z_MID (Z_TOP + Z_RAD)
84	#define Z_BOT (Z_MID + Z_RAD)
85	#define Z_LEFT (Z_RAD)
86	#define Z_RIGHT (2 * D_RAD - Z_RAD)
87
88
89	/* create the cairo shape used for the zoom buttons */
90	static void
91	osm_gps_map_osd_zoom_shape(cairo_t *cr, gint x, gint y)
92	{
93	cairo_move_to (cr, x+Z_LEFT, y+Z_TOP);
94	cairo_line_to (cr, x+Z_RIGHT, y+Z_TOP);
95	cairo_arc (cr, x+Z_RIGHT, y+Z_MID, Z_RAD, -M_PI/2, M_PI/2);
96	cairo_line_to (cr, x+Z_LEFT, y+Z_BOT);
97	cairo_arc (cr, x+Z_LEFT, y+Z_MID, Z_RAD, M_PI/2, -M_PI/2);
98	}
99
100	/* create the cairo shape used for the dpad */
101	static void
102	osm_gps_map_osd_dpad_shape(cairo_t *cr, gint x, gint y)
103	{
104	cairo_arc (cr, x+D_RAD, y+D_RAD, D_RAD, 0, 2 * M_PI);
105	}
106
107	static gboolean
108	osm_gps_map_in_circle(gint x, gint y, gint cx, gint cy, gint rad)
109	{
110	return( pow(cx - x, 2) + pow(cy - y, 2) < rad * rad);
111	}
112
113	/* check whether x/y is within the dpad */
114	static osd_button_t
115	osm_gps_map_osd_check_dpad(gint x, gint y)
116	{
117	/* within entire dpad circle */
118	if( osm_gps_map_in_circle(x, y, OSD_X + D_RAD, OSD_Y + D_RAD, D_RAD))
119	{
120	/* convert into position relative to dpads centre */
121	x -= (OSD_X + D_RAD);
122	y -= (OSD_Y + D_RAD);
123
124	/* check for dpad center goes here! */
125	if( osm_gps_map_in_circle(x, y, 0, 0, D_RAD/3))
126	return OSD_GPS;
127
128	if( y < 0 && abs(x) < abs(y))
129	return OSD_UP;
130
131	if( y > 0 && abs(x) < abs(y))
132	return OSD_DOWN;
133
134	if( x < 0 && abs(y) < abs(x))
135	return OSD_LEFT;
136
137	if( x > 0 && abs(y) < abs(x))
138	return OSD_RIGHT;
139
140	return OSD_BG;
141	}
142	return OSD_NONE;
143	}
144
145	/* check whether x/y is within the zoom pads */
146	static osd_button_t
147	osm_gps_map_osd_check_zoom(gint x, gint y) {
148	if( x > OSD_X && x < (OSD_X + OSD_W) && y > Z_TOP && y < (OSD_Y+Z_BOT)) {
149
150	/* within circle around (-) label */
151	if( osm_gps_map_in_circle(x, y, OSD_X + Z_LEFT, OSD_Y + Z_MID, Z_RAD))
152	return OSD_OUT;
153
154	/* between center of (-) button and center of entire zoom control area */
155	if(x > OSD_LEFT && x < OSD_X + D_RAD)
156	return OSD_OUT;
157
158	/* within circle around (+) label */
159	if( osm_gps_map_in_circle(x, y, OSD_X + Z_RIGHT, OSD_Y + Z_MID, Z_RAD))
160	return OSD_IN;
161
162	/* between center of (+) button and center of entire zoom control area */
163	if(x < OSD_RIGHT && x > OSD_X + D_RAD)
164	return OSD_IN;
165	}
166
167	return OSD_NONE;
168	}
169
170	static osd_button_t
171	osm_gps_map_osd_check(gint x, gint y) {
172	osd_button_t but = OSD_NONE;
173
174	/* first do a rough test for the OSD area. */
175	/* this is just to avoid an unnecessary detailed test */
176	if(x > OSD_X && x < OSD_X + OSD_W &&
177	y > OSD_Y && y < OSD_Y + OSD_H) {
178	but = osm_gps_map_osd_check_dpad(x, y);
179
180	if(but == OSD_NONE)
181	but = osm_gps_map_osd_check_zoom(x, y);
182	}
183
184	return but;
185	}
186
187	#ifdef OSD_SHADOW_ENABLE
188	static void
189	osm_gps_map_osd_shape_shadow(cairo_t *cr) {
190	cairo_set_source_rgba (cr, 0, 0, 0, 0.2);
191	cairo_fill (cr);
192	cairo_stroke (cr);
193	}
194	#endif
195
196	#ifndef OSD_COLOR
197	/* if no color has been specified we just use the gdks default colors */
198	static void
199	osm_gps_map_osd_shape(cairo_t cr, GdkColor bg, GdkColor *fg) {
200	gdk_cairo_set_source_color(cr, bg);
201	cairo_fill_preserve (cr);
202	gdk_cairo_set_source_color(cr, fg);
203	cairo_set_line_width (cr, 1);
204	cairo_stroke (cr);
205	}
206	#else
207	static void
208	osm_gps_map_osd_shape(cairo_t *cr) {
209	cairo_set_source_rgb (cr, OSD_COLOR_BG);
210	cairo_fill_preserve (cr);
211	cairo_set_source_rgb (cr, OSD_COLOR);
212	cairo_set_line_width (cr, 1);
213	cairo_stroke (cr);
214	}
215	#endif
216
217	static void
218	osm_gps_map_osd_dpad_labels(cairo_t *cr, gint x, gint y) {
219	/* move reference to dpad center */
220	x += D_RAD;
221	y += D_RAD;
222
223	const static gint offset[][3][2] = {
224	/* left arrow/triangle */
225	{ { -D_TIP+D_LEN, -D_WID }, { -D_LEN, D_WID }, { +D_LEN, D_WID } },
226	/* right arrow/triangle */
227	{ { +D_TIP-D_LEN, -D_WID }, { +D_LEN, D_WID }, { -D_LEN, D_WID } },
228	/* top arrow/triangle */
229	{ { -D_WID, -D_TIP+D_LEN }, { D_WID, -D_LEN }, { D_WID, +D_LEN } },
230	/* bottom arrow/triangle */
231	{ { -D_WID, +D_TIP-D_LEN }, { D_WID, +D_LEN }, { D_WID, -D_LEN } }
232	};
233
234	int i;
235	for(i=0;i<4;i++) {
236	cairo_move_to (cr, x + offset[i][0][0], y + offset[i][0][1]);
237	cairo_rel_line_to (cr, offset[i][1][0], offset[i][1][1]);
238	cairo_rel_line_to (cr, offset[i][2][0], offset[i][2][1]);
239	}
240	}
241
242	/* draw the sattelite dish icon in the center of the dpad */
243	#define GPS_V0 (D_RAD/8)
244	#define GPS_V1 (D_RAD/10)
245	#define GPS_V2 (D_RAD/5)
246
247	/* draw a satellite receiver dish */
248	static void
249	osm_gps_map_osd_dpad_gps(cairo_t *cr, gint x, gint y) {
250	/* move reference to dpad center */
251	x += D_RAD;
252	y += D_RAD + GPS_V0;
253
254	cairo_move_to (cr, x-GPS_V0, y+GPS_V0);
255	cairo_rel_line_to (cr, +GPS_V0, -GPS_V0);
256	cairo_rel_line_to (cr, +GPS_V0, +GPS_V0);
257	cairo_close_path (cr);
258
259	cairo_move_to (cr, x+GPS_V1-GPS_V2, y-2*GPS_V2);
260	cairo_curve_to (cr, x-GPS_V2, y, x+GPS_V1, y+GPS_V1, x+GPS_V1+GPS_V2, y);
261	cairo_close_path (cr);
262
263	x += GPS_V1;
264	cairo_move_to (cr, x, y-GPS_V2);
265	cairo_rel_line_to (cr, +GPS_V1, -GPS_V1);
266	}
267
268	#define Z_LEN (2*Z_RAD/3)
269
270	static void
271	osm_gps_map_osd_zoom_labels(cairo_t *cr, gint x, gint y) {
272	cairo_move_to (cr, x + Z_LEFT - Z_LEN, y + Z_MID);
273	cairo_line_to (cr, x + Z_LEFT + Z_LEN, y + Z_MID);
274
275	cairo_move_to (cr, x + Z_RIGHT, y + Z_MID - Z_LEN);
276	cairo_line_to (cr, x + Z_RIGHT, y + Z_MID + Z_LEN);
277	cairo_move_to (cr, x + Z_RIGHT - Z_LEN, y + Z_MID);
278	cairo_line_to (cr, x + Z_RIGHT + Z_LEN, y + Z_MID);
279	}
280
281	#ifndef OSD_COLOR
282	/* if no color has been specified we just use the gdks default colors */
283	static void
284	osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled,
285	GdkColor fg, GdkColor disabled) {
286	if(enabled) gdk_cairo_set_source_color(cr, fg);
287	else gdk_cairo_set_source_color(cr, disabled);
288	cairo_set_line_width (cr, width);
289	cairo_stroke (cr);
290	}
291	#else
292	static void
293	osm_gps_map_osd_labels(cairo_t *cr, gint width, gboolean enabled) {
294	if(enabled) cairo_set_source_rgb (cr, OSD_COLOR);
295	else cairo_set_source_rgb (cr, OSD_COLOR_DISABLED);
296	cairo_set_line_width (cr, width);
297	cairo_stroke (cr);
298	}
299	#endif
300
301	#ifdef OSD_SHADOW_ENABLE
302	static void
303	osm_gps_map_osd_labels_shadow(cairo_t *cr, gint width, gboolean enabled) {
304	cairo_set_source_rgba (cr, 0, 0, 0, enabled?0.3:0.15);
305	cairo_set_line_width (cr, width);
306	cairo_stroke (cr);
307	}
308	#endif
309
310	static void
311	osm_gps_map_osd_render(osm_gps_map_osd_t *osd) {
312	osd_priv_t priv = (osd_priv_t)osd->priv;
313
314	/* first fill with transparency */
315	cairo_t *cr = cairo_create(priv->overlay);
316	cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
317	cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 0.0);
318	cairo_paint(cr);
319
320	cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
321
322	/* --------- draw zoom and dpad shape shadow ----------- */
323	gint x = 0, y = 0;
324
325	#ifdef OSD_SHADOW_ENABLE
326	osm_gps_map_osd_zoom_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
327	osm_gps_map_osd_shape_shadow(cr);
328	osm_gps_map_osd_dpad_shape(cr, x + OSD_SHADOW, y + OSD_SHADOW);
329	osm_gps_map_osd_shape_shadow(cr);
330	#endif
331
332	/* --------- draw zoom and dpad shape ----------- */
333
334	osm_gps_map_osd_zoom_shape(cr, x, y);
335	#ifndef OSD_COLOR
336	osm_gps_map_osd_shape(cr, &priv->bg, &priv->fg);
337	#else
338	osm_gps_map_osd_shape(cr);
339	#endif
340	osm_gps_map_osd_dpad_shape(cr, x, y);
341	#ifndef OSD_COLOR
342	osm_gps_map_osd_shape(cr, &priv->bg, &priv->fg);
343	#else
344	osm_gps_map_osd_shape(cr);
345	#endif
346
347	/* --------- draw zoom and dpad labels --------- */
348
349	#ifdef OSD_SHADOW_ENABLE
350	osm_gps_map_osd_zoom_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
351	osm_gps_map_osd_dpad_labels(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
352	osm_gps_map_osd_labels_shadow(cr, Z_RAD/3, TRUE);
353	osm_gps_map_osd_dpad_gps(cr, x + OSD_LBL_SHADOW, y + OSD_LBL_SHADOW);
354	osm_gps_map_osd_labels_shadow(cr, Z_RAD/6, osd->cb != NULL);
355	#endif
356
357	osm_gps_map_osd_zoom_labels(cr, x, y);
358	osm_gps_map_osd_dpad_labels(cr, x, y);
359	#ifndef OSD_COLOR
360	osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE, &priv->fg, &priv->da);
361	#else
362	osm_gps_map_osd_labels(cr, Z_RAD/3, TRUE);
363	#endif
364	osm_gps_map_osd_dpad_gps(cr, x, y);
365	#ifndef OSD_COLOR
366	osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL, &priv->fg, &priv->da);
367	#else
368	osm_gps_map_osd_labels(cr, Z_RAD/6, osd->cb != NULL);
369	#endif
370
371	cairo_destroy(cr);
372	}
373
374	static void
375	osm_gps_map_osd_draw(osm_gps_map_osd_t *osd, gint xoffset, gint yoffset)
376	{
377	osd_priv_t priv = (osd_priv_t)osd->priv;
378
379	/* backup previous contents */
380	if(!priv->backup)
381	priv->backup = gdk_pixmap_new(osd->pixmap, OSD_W+2, OSD_H+2, -1);
382
383	gint x = OSD_X + xoffset;
384	gint y = OSD_Y + yoffset;
385
386	/* create backup of background */
387	gdk_draw_drawable(priv->backup,
388	osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
389	osd->pixmap, x-1, y-1, 0, 0, OSD_W+2, OSD_H+2);
390
391	priv->backup_x = x-1;
392	priv->backup_y = y-1;
393
394	/* OSD itself uses some off-screen rendering, so check if the */
395	/* offscreen buffer is present and create it if not */
396	if(!priv->overlay) {
397	/* create overlay ... */
398	priv->overlay =
399	cairo_image_surface_create(CAIRO_FORMAT_ARGB32, OSD_W, OSD_H);
400	/* ... and render it */
401	osm_gps_map_osd_render(osd);
402	}
403
404	// now draw this onto the original context
405	cairo_t *cr = gdk_cairo_create(osd->pixmap);
406	cairo_set_source_surface(cr, priv->overlay, x, y);
407	cairo_paint(cr);
408	cairo_destroy(cr);
409	}
410
411	static void
412	osm_gps_map_osd_restore (osm_gps_map_osd_t *osd)
413	{
414	osd_priv_t priv = (osd_priv_t)osd->priv;
415
416	/* restore backup of previous contents */
417	if(priv->backup) {
418	/* create backup of background */
419	gdk_draw_drawable(osd->pixmap,
420	osd->widget->style->fg_gc[GTK_WIDGET_STATE(osd->widget)],
421	priv->backup, 0, 0,
422	priv->backup_x, priv->backup_y, OSD_W+2, OSD_H+2);
423	}
424	}
425
426	static void
427	osm_gps_map_osd_free(osm_gps_map_osd_t *osd)
428	{
429	osd_priv_t priv = (osd_priv_t )(osd->priv);
430
431	if (priv->backup)
432	g_object_unref(priv->backup);
433
434	if (priv->overlay)
435	cairo_surface_destroy(priv->overlay);
436
437	g_free(priv);
438	}
439
440	static osm_gps_map_osd_t osd_classic = {
441	.restore = osm_gps_map_osd_restore,
442	.draw = osm_gps_map_osd_draw,
443	.check = osm_gps_map_osd_check,
444	.render = osm_gps_map_osd_render,
445	.free = osm_gps_map_osd_free,
446
447	.cb = NULL,
448	.data = NULL,
449
450	.priv = NULL
451	};
452
453	/* this is the only function that's externally visible */
454	void
455	osm_gps_map_osd_classic_init(OsmGpsMap *map)
456	{
457	osd_priv_t *priv = osd_classic.priv = g_new0(osd_priv_t, 1);
458
459	osd_classic.priv = priv;
460
461	/* extract style info from the widget */
462	priv->bg = GTK_WIDGET(map)->style->bg[GTK_STATE_NORMAL];
463	priv->fg = GTK_WIDGET(map)->style->fg[GTK_STATE_NORMAL];
464	priv->da = GTK_WIDGET(map)->style->fg[GTK_STATE_INSENSITIVE];
465
466	osm_gps_map_register_osd(map, &osd_classic);
467	}
468
469
470	/* below are osd specific functions which aren't used by osm-gps-map */
471	/* but instead are to be used by the main application */
472	void osm_gps_map_osd_enable_gps (OsmGpsMap *map, OsmGpsMapOsdCallback cb, gpointer data) {
473	osm_gps_map_osd_t *osd = osm_gps_map_osd_get(map);
474
475	g_return_if_fail (osd);
476
477	osd->cb = cb;
478	osd->data = data;
479
480	/* this may have changed the state of the gps button */
481	/* we thus re-render the overlay */
482	osd->render(osd);
483
484	osm_gps_map_redraw(map);
485	}