2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2007, Evan Battaglia <gtoevan@gmx.net>
6 * Lat/Lon plotting functions calcxy* are from GPSDrive
7 * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at>
9 * Multiple UTM zone patch by Kit Transue <notlostyet@didactek.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #define DEFAULT_BACKGROUND_COLOR "#CCCCCC"
31 #define DEFAULT_HIGHLIGHT_COLOR "#EEA500"
32 /* Default highlight in orange */
44 #include "vikwindow.h"
45 #include "vikviewport.h"
52 static gdouble EASTING_OFFSET = 500000.0;
56 static void viewport_finalize ( GObject *gob );
57 static void viewport_utm_zone_check ( VikViewport *vvp );
59 static gboolean calcxy(double *x, double *y, double lg, double lt, double zero_long, double zero_lat, double pixelfact_x, double pixelfact_y, gint mapSizeX2, gint mapSizeY2 );
60 static gboolean calcxy_rev(double *lg, double *lt, gint x, gint y, double zero_long, double zero_lat, double pixelfact_x, double pixelfact_y, gint mapSizeX2, gint mapSizeY2 );
61 double calcR (double lat);
63 static double Radius[181];
64 static void viewport_init_ra();
66 static GObjectClass *parent_class;
70 GtkDrawingArea drawing_area;
71 GdkPixmap *scr_buffer;
74 VikCoordMode coord_mode;
77 GdkPixbuf *alpha_pixbuf;
78 guint8 alpha_pixbuf_width;
79 guint8 alpha_pixbuf_height;
81 gdouble utm_zone_width;
82 gboolean one_utm_zone;
85 GdkColor background_color;
91 /* Wether or not display OSD info */
93 gboolean draw_centermark;
94 gboolean draw_highlight;
96 GdkColor highlight_color;
98 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
99 VikViewportDrawMode drawmode;
101 /* handy conversion factors which make google plotting extremely fast */
102 gdouble google_calcx_fact;
103 gdouble google_calcy_fact;
104 gdouble google_calcx_rev_fact;
105 gdouble google_calcy_rev_fact;
109 GdkPixmap *snapshot_buffer;
114 viewport_utm_zone_width ( VikViewport *vvp )
116 if ( vvp->coord_mode == VIK_COORD_UTM ) {
119 /* get latitude of screen bottom */
120 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
121 utm.northing -= vvp -> height * vvp -> ympp / 2;
122 a_coords_utm_to_latlon ( &utm, &ll );
125 ll.lon = (utm.zone - 1) * 6 - 180 ;
126 a_coords_latlon_to_utm ( &ll, &utm);
127 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
132 G_DEFINE_TYPE (VikViewport, vik_viewport, GTK_TYPE_DRAWING_AREA)
135 vik_viewport_class_init ( VikViewportClass *klass )
138 GObjectClass *object_class;
140 object_class = G_OBJECT_CLASS (klass);
142 object_class->finalize = viewport_finalize;
144 parent_class = g_type_class_peek_parent (klass);
147 VikViewport *vik_viewport_new ()
149 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
154 vik_viewport_init ( VikViewport *vvp )
160 ll.lat = a_vik_get_default_lat();
161 ll.lon = a_vik_get_default_long();
162 a_coords_latlon_to_utm ( &ll, &utm );
164 /* TODO: not static */
167 vvp->coord_mode = VIK_COORD_LATLON;
168 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
169 vvp->center.mode = VIK_COORD_LATLON;
170 vvp->center.north_south = ll.lat;
171 vvp->center.east_west = ll.lon;
172 vvp->center.utm_zone = (int)utm.zone;
173 vvp->center.utm_letter = utm.letter;
174 vvp->scr_buffer = NULL;
175 vvp->alpha_pixbuf = NULL;
176 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
177 vvp->utm_zone_width = 0.0;
178 vvp->background_gc = NULL;
179 vvp->highlight_gc = NULL;
180 vvp->scale_bg_gc = NULL;
182 vvp->copyrights = NULL;
184 vvp->draw_scale = TRUE;
185 vvp->draw_centermark = TRUE;
186 vvp->draw_highlight = TRUE;
189 vvp->snapshot_buffer = NULL;
190 vvp->half_drawn = FALSE;
192 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
194 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
197 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
199 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
200 *rv = vvp->background_color;
204 /* returns pointer to internal static storage, changes next time function called, use quickly */
205 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
207 static gchar color[8];
208 g_snprintf(color, sizeof(color), "#%.2x%.2x%.2x", (int)(vvp->background_color.red/256),(int)(vvp->background_color.green/256),(int)(vvp->background_color.blue/256));
212 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
214 g_assert ( vvp && vvp->background_gc );
215 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
216 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
218 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
221 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
223 g_assert ( vvp && vvp->background_gc );
224 vvp->background_color = *color;
225 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
228 GdkColor *vik_viewport_get_highlight_gdkcolor ( VikViewport *vvp )
230 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
231 *rv = vvp->highlight_color;
235 /* returns pointer to internal static storage, changes next time function called, use quickly */
236 const gchar *vik_viewport_get_highlight_color ( VikViewport *vvp )
238 static gchar color[8];
239 g_snprintf(color, sizeof(color), "#%.2x%.2x%.2x", (int)(vvp->highlight_color.red/256),(int)(vvp->highlight_color.green/256),(int)(vvp->highlight_color.blue/256));
243 void vik_viewport_set_highlight_color ( VikViewport *vvp, const gchar *colorname )
245 g_assert ( vvp->highlight_gc );
246 gdk_color_parse ( colorname, &(vvp->highlight_color) );
247 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, &(vvp->highlight_color) );
250 void vik_viewport_set_highlight_gdkcolor ( VikViewport *vvp, GdkColor *color )
252 g_assert ( vvp->highlight_gc );
253 vvp->highlight_color = *color;
254 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, color );
257 GdkGC *vik_viewport_get_gc_highlight ( VikViewport *vvp )
259 return vvp->highlight_gc;
262 void vik_viewport_set_highlight_thickness ( VikViewport *vvp, gint thickness )
264 // Otherwise same GDK_* attributes as in vik_viewport_new_gc
265 gdk_gc_set_line_attributes ( vvp->highlight_gc, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
268 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
273 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
274 if ( gdk_color_parse ( colorname, &color ) )
275 gdk_gc_set_rgb_fg_color ( rv, &color );
277 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
278 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
282 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
286 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
287 gdk_gc_set_rgb_fg_color ( rv, color );
288 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
292 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
295 vvp->height = height;
296 if ( vvp->scr_buffer )
297 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
298 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
300 /* TODO trigger: only if this is enabled !!! */
301 if ( vvp->snapshot_buffer )
302 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
303 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
307 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
309 return vvp->scr_buffer;
312 gboolean vik_viewport_configure ( VikViewport *vvp )
314 g_return_val_if_fail ( vvp != NULL, TRUE );
316 vvp->width = GTK_WIDGET(vvp)->allocation.width;
317 vvp->height = GTK_WIDGET(vvp)->allocation.height;
319 if ( vvp->scr_buffer )
320 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
322 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
324 /* TODO trigger: only if enabled! */
325 if ( vvp->snapshot_buffer )
326 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
328 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
331 /* this is down here so it can get a GC (necessary?) */
332 if ( !vvp->background_gc )
334 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
335 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
337 if ( ! vvp->highlight_gc )
339 vvp->highlight_gc = vik_viewport_new_gc ( vvp, DEFAULT_HIGHLIGHT_COLOR, 1 );
340 vik_viewport_set_highlight_color ( vvp, DEFAULT_HIGHLIGHT_COLOR );
342 if ( !vvp->scale_bg_gc) {
343 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
349 static void viewport_finalize ( GObject *gob )
351 VikViewport *vvp = VIK_VIEWPORT(gob);
353 g_return_if_fail ( vvp != NULL );
355 if ( vvp->scr_buffer )
356 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
358 if ( vvp->snapshot_buffer )
359 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
361 if ( vvp->alpha_pixbuf )
362 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
364 if ( vvp->background_gc )
365 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
367 if ( vvp->highlight_gc )
368 g_object_unref ( G_OBJECT ( vvp->highlight_gc ) );
370 if ( vvp->scale_bg_gc ) {
371 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
372 vvp->scale_bg_gc = NULL;
375 G_OBJECT_CLASS(parent_class)->finalize(gob);
379 * vik_viewport_clear:
382 * Clear the whole viewport.
384 void vik_viewport_clear ( VikViewport *vvp )
386 g_return_if_fail ( vvp != NULL );
387 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
388 vik_viewport_reset_copyrights ( vvp );
389 vik_viewport_reset_logos ( vvp );
393 * vik_viewport_set_draw_scale:
395 * @draw_scale: new value
397 * Enable/Disable display of scale.
399 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
401 vvp->draw_scale = draw_scale;
404 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
406 return vvp->draw_scale;
409 void vik_viewport_draw_scale ( VikViewport *vvp )
411 g_return_if_fail ( vvp != NULL );
413 if ( vvp->draw_scale ) {
414 VikCoord left, right;
415 gdouble unit, base, diff, old_unit, old_diff, ratio;
416 gint odd, len, SCSIZE = 5, HEIGHT=10;
420 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
421 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
423 vik_units_distance_t dist_units = a_vik_get_units_distance ();
424 switch (dist_units) {
425 case VIK_UNITS_DISTANCE_KILOMETRES:
426 base = vik_coord_diff ( &left, &right ); // in meters
428 case VIK_UNITS_DISTANCE_MILES:
429 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
430 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
433 base = 1; // Keep the compiler happy
434 g_critical("Houston, we've had a problem. distance=%d", dist_units);
436 ratio = (vvp->width/SCSIZE)/base;
439 diff = fabs(base-unit);
443 while (diff <= old_diff) {
446 unit = unit * (odd%2 ? 5 : 2);
447 diff = fabs(base-unit);
453 /* white background */
454 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
455 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
456 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
457 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
458 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
459 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
461 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
462 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
463 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
464 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
465 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
466 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
469 for (i=1; i<5; i++) {
470 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
471 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
472 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
473 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
477 for (i=1; i<10; i++) {
478 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
479 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
480 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
481 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
484 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
485 pango_layout_set_font_description (pl, GTK_WIDGET(&vvp->drawing_area)->style->font_desc);
487 switch (dist_units) {
488 case VIK_UNITS_DISTANCE_KILOMETRES:
490 sprintf(s, "%d km", (int)unit/1000);
492 sprintf(s, "%d m", (int)unit);
495 case VIK_UNITS_DISTANCE_MILES:
496 // Handle units in 0.1 miles
498 sprintf(s, "%0.1f miles", unit/10.0);
500 else if ((int)unit == 10.0) {
501 sprintf(s, "1 mile");
504 sprintf(s, "%d miles", (int)(unit/10.0));
508 g_critical("Houston, we've had a problem. distance=%d", dist_units);
510 pango_layout_set_text(pl, s, -1);
511 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
512 PAD + len + PAD, vvp->height - PAD - 10, pl);
518 void vik_viewport_draw_copyright ( VikViewport *vvp )
520 g_return_if_fail ( vvp != NULL );
523 PangoRectangle ink_rect, logical_rect;
526 /* compute copyrights string */
527 guint len = g_slist_length ( vvp->copyrights );
530 for (i = 0 ; i < len ; i++)
532 // Stop when buffer is full
533 int slen = strlen ( s );
537 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
539 // Only use part of this copyright that fits in the available space left
540 // remembering 1 character is left available for the appended space
541 int clen = strlen ( copyright );
542 if ( slen + clen > 126 ) {
546 strncat ( s, copyright, clen );
550 /* create pango layout */
551 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
552 pango_layout_set_font_description (pl, GTK_WIDGET(&vvp->drawing_area)->style->font_desc);
553 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
556 pango_layout_set_text(pl, s, -1);
558 /* Use maximum of half the viewport width */
559 pango_layout_set_width ( pl, ( vvp->width / 2 ) * PANGO_SCALE );
560 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
561 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
562 vvp->width / 2, vvp->height - logical_rect.height, pl);
570 * vik_viewport_set_draw_centermark:
572 * @draw_centermark: new value
574 * Enable/Disable display of center mark.
576 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
578 vvp->draw_centermark = draw_centermark;
581 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
583 return vvp->draw_centermark;
586 void vik_viewport_draw_centermark ( VikViewport *vvp )
588 g_return_if_fail ( vvp != NULL );
590 if ( !vvp->draw_centermark )
595 int center_x = vvp->width/2;
596 int center_y = vvp->height/2;
597 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
599 /* white back ground */
600 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
601 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
602 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
603 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
604 /* black fore ground */
605 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
606 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
607 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
608 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
612 void vik_viewport_draw_logo ( VikViewport *vvp )
614 g_return_if_fail ( vvp != NULL );
616 guint len = g_slist_length ( vvp->logos );
617 gint x = vvp->width - PAD;
620 for (i = 0 ; i < len ; i++)
622 GdkPixbuf *logo = g_slist_nth_data ( vvp->logos, i );
623 gint width = gdk_pixbuf_get_width ( logo );
624 gint height = gdk_pixbuf_get_height ( logo );
625 vik_viewport_draw_pixbuf ( vvp, logo, 0, 0, x - width, y, width, height );
630 void vik_viewport_set_draw_highlight ( VikViewport *vvp, gboolean draw_highlight )
632 vvp->draw_highlight = draw_highlight;
635 gboolean vik_viewport_get_draw_highlight ( VikViewport *vvp )
637 return vvp->draw_highlight;
640 void vik_viewport_sync ( VikViewport *vvp )
642 g_return_if_fail ( vvp != NULL );
643 gdk_draw_drawable(GTK_WIDGET(vvp)->window, GTK_WIDGET(vvp)->style->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, 0, 0, vvp->width, vvp->height);
646 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
650 g_return_if_fail ( vvp != NULL );
651 gdk_draw_drawable(GTK_WIDGET(vvp)->window, GTK_WIDGET(vvp)->style->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, x_off, y_off, vvp->width, vvp->height);
657 x = vvp->width+x_off;
664 y = vvp->height+y_off;
667 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
668 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
671 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
673 g_return_if_fail ( vvp != NULL );
674 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
675 vvp->xmpp = vvp->ympp = xympp;
677 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
678 viewport_utm_zone_check(vvp);
681 /* or could do factor */
682 void vik_viewport_zoom_in ( VikViewport *vvp )
684 g_return_if_fail ( vvp != NULL );
685 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
690 viewport_utm_zone_check(vvp);
694 void vik_viewport_zoom_out ( VikViewport *vvp )
696 g_return_if_fail ( vvp != NULL );
697 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
702 viewport_utm_zone_check(vvp);
706 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
708 if ( vvp->xmpp == vvp->ympp )
713 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
718 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
723 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
725 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
727 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
728 viewport_utm_zone_check(vvp);
732 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
734 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
736 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
737 viewport_utm_zone_check(vvp);
742 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
744 g_return_val_if_fail ( vvp != NULL, NULL );
745 return &(vvp->center);
748 /* called every time we update coordinates/zoom */
749 static void viewport_utm_zone_check ( VikViewport *vvp )
751 if ( vvp->coord_mode == VIK_COORD_UTM )
755 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
756 a_coords_latlon_to_utm ( &ll, &utm );
757 if ( utm.zone != vvp->center.utm_zone )
758 *((struct UTM *)(&vvp->center)) = utm;
760 /* misc. stuff so we don't have to check later */
761 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
762 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
766 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
768 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
769 if ( vvp->coord_mode == VIK_COORD_UTM )
770 viewport_utm_zone_check ( vvp );
773 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
775 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
776 if ( vvp->coord_mode == VIK_COORD_UTM )
777 viewport_utm_zone_check ( vvp );
780 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
782 vvp->center = *coord;
783 if ( vvp->coord_mode == VIK_COORD_UTM )
784 viewport_utm_zone_check ( vvp );
787 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
789 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
791 /* get center, then just offset */
792 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
793 ul->mode = VIK_COORD_UTM;
796 ul->north_south += (vvp->ympp * vvp->height / 2);
797 ul->east_west -= (vvp->xmpp * vvp->width / 2);
798 br->north_south -= (vvp->ympp * vvp->height / 2);
799 br->east_west += (vvp->xmpp * vvp->width / 2);
802 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
804 if ( vvp->coord_mode == VIK_COORD_UTM ) {
805 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
806 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
811 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
813 if ( vvp->coord_mode == VIK_COORD_UTM ) {
815 g_assert ( vvp != NULL );
816 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
817 return coord.utm_zone;
822 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
824 if ( vvp->coord_mode == VIK_COORD_UTM ) {
826 g_assert ( vvp != NULL );
827 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
828 return coord.utm_zone;
834 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
836 g_return_if_fail ( vvp != NULL );
837 if ( vvp->coord_mode == VIK_COORD_UTM ) {
838 /* slightly optimized */
839 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
840 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
841 viewport_utm_zone_check ( vvp );
844 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
845 vik_viewport_set_center_coord ( vvp, &tmp );
849 gint vik_viewport_get_width( VikViewport *vvp )
851 g_return_val_if_fail ( vvp != NULL, 0 );
855 gint vik_viewport_get_height( VikViewport *vvp )
857 g_return_val_if_fail ( vvp != NULL, 0 );
861 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
863 g_return_if_fail ( vvp != NULL );
865 if ( vvp->coord_mode == VIK_COORD_UTM ) {
867 struct UTM *utm = (struct UTM *) coord;
868 coord->mode = VIK_COORD_UTM;
870 utm->zone = vvp->center.utm_zone;
871 utm->letter = vvp->center.utm_letter;
872 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
873 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
874 utm->zone += zone_delta;
875 utm->easting -= zone_delta * vvp->utm_zone_width;
876 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
877 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
878 coord->mode = VIK_COORD_LATLON;
879 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
880 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
881 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
882 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
883 calcxy_rev(&(coord->east_west), &(coord->north_south), x, y, vvp->center.east_west, vvp->center.north_south, vvp->xmpp * ALTI_TO_MPP, vvp->ympp * ALTI_TO_MPP, vvp->width/2, vvp->height/2);
884 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
886 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
887 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
890 --> THIS IS JUNK HERE.
891 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
893 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
894 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
900 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
903 g_return_if_fail ( vvp != NULL );
905 if ( coord->mode != vvp->coord_mode )
907 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
908 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
912 if ( vvp->coord_mode == VIK_COORD_UTM ) {
913 struct UTM *center = (struct UTM *) &(vvp->center);
914 struct UTM *utm = (struct UTM *) coord;
915 if ( center->zone != utm->zone && vvp->one_utm_zone )
917 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
921 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
922 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
923 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
924 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
925 struct LatLon *center = (struct LatLon *) &(vvp->center);
926 struct LatLon *ll = (struct LatLon *) coord;
928 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
929 /* FIXMERCATOR: Optimize */
930 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
931 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
932 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
933 calcxy ( &xx, &yy, center->lon, center->lat, ll->lon, ll->lat, vvp->xmpp * ALTI_TO_MPP, vvp->ympp * ALTI_TO_MPP, vvp->width / 2, vvp->height / 2 );
935 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
936 /* FIXMERCATOR: Optimize */
937 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
938 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
943 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
945 if ( *x1 > 20000 || *x1 < -20000 ) {
946 gdouble shrinkfactor = ABS(20000.0 / *x1);
947 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
948 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
949 } else if ( *y1 > 20000 || *y1 < -20000 ) {
950 gdouble shrinkfactor = ABS(20000.0 / *x1);
951 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
952 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
953 } else if ( *x2 > 20000 || *x2 < -20000 ) {
954 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
955 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
956 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
957 } else if ( *y2 > 20000 || *y2 < -20000 ) {
958 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
959 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
960 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
964 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
966 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
967 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
968 /*** clipping, yeah! ***/
969 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
970 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
974 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
976 // Using 32 as half the default waypoint image size, so this draws ensures the highlight gets done
977 if ( x1 > -32 && x1 < vvp->width + 32 && y1 > -32 && y1 < vvp->height + 32 )
978 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
981 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
983 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
984 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
987 /* shouldn't use this -- slow -- change the alpha channel instead. */
988 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
989 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
991 gint real_dest_x = MAX(dest_x,0);
992 gint real_dest_y = MAX(dest_y,0);
995 return; /* don't waste your time */
997 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
999 if ( vvp->alpha_pixbuf )
1000 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
1001 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
1002 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
1003 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
1006 w = MIN(w,vvp->width - dest_x);
1007 h = MIN(h,vvp->height - dest_y);
1009 /* check that we are drawing within boundaries. */
1010 src_x += (real_dest_x - dest_x);
1011 src_y += (real_dest_y - dest_y);
1012 w -= (real_dest_x - dest_x);
1013 h -= (real_dest_y - dest_y);
1015 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
1016 real_dest_x, real_dest_y, 0, 0, w, h );
1018 /* do a composite */
1019 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
1021 /* draw pixbuf_tmp */
1022 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
1025 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
1026 gint dest_x, gint dest_y, gint w, gint h )
1028 gdk_draw_pixbuf ( vvp->scr_buffer,
1029 // GTK_WIDGET(vvp)->style->black_gc,
1032 src_x, src_y, dest_x, dest_y, w, h,
1033 GDK_RGB_DITHER_NONE, 0, 0 );
1036 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
1038 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
1042 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
1044 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
1047 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
1050 return vvp->coord_mode;
1053 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
1055 g_return_if_fail ( vvp != NULL );
1056 vvp->coord_mode = mode;
1057 vik_coord_convert ( &(vvp->center), mode );
1060 /* Thanks GPSDrive */
1061 static gboolean calcxy_rev(double *lg, double *lt, gint x, gint y, double zero_long, double zero_lat, double pixelfact_x, double pixelfact_y, gint mapSizeX2, gint mapSizeY2 )
1064 gdouble dif, lat, lon;
1065 double Ra = Radius[90+(gint)zero_lat];
1067 px = (mapSizeX2 - x) * pixelfact_x;
1068 py = (-mapSizeY2 + y) * pixelfact_y;
1070 lat = zero_lat - py / Ra;
1071 lat = zero_lat - py / Ra;
1075 cos (lat * DEG2RAD));
1077 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
1078 lat = lat - dif / 1.5;
1082 cos (lat * DEG2RAD));
1089 /* Thanks GPSDrive */
1090 static gboolean calcxy(double *x, double *y, double lg, double lt, double zero_long, double zero_lat, double pixelfact_x, double pixelfact_y, gint mapSizeX2, gint mapSizeY2 )
1094 gint mapSizeX = 2 * mapSizeX2;
1095 gint mapSizeY = 2 * mapSizeY2;
1097 g_assert ( lt >= -90.0 && lt <= 90.0 );
1098 // lg *= rad2deg; // FIXME, optimize equations
1100 Ra = Radius[90+(gint)lt];
1102 cos (lt*DEG2RAD) * (lg - zero_long);
1103 *y = Ra * (lt - zero_lat);
1104 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
1105 *y = *y + dif / 1.85;
1106 *x = *x / pixelfact_x;
1107 *y = *y / pixelfact_y;
1108 *x = mapSizeX2 - *x;
1110 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1115 static void viewport_init_ra()
1117 static gboolean done_before = FALSE;
1121 for ( i = -90; i <= 90; i++)
1122 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
1127 double calcR (double lat)
1129 double a = 6378.137, r, sc, x, y, z;
1130 double e2 = 0.081082 * 0.081082;
1132 * the radius of curvature of an ellipsoidal Earth in the plane of the
1133 * meridian is given by
1135 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1138 * where a is the equatorial radius, b is the polar radius, and e is
1139 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1141 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1142 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1143 * = 0.081082 Eccentricity
1146 lat = lat * DEG2RAD;
1149 z = 1.0 - e2 * sc * sc;
1156 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1158 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1161 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1163 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1164 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1167 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1169 static GdkGCValues values;
1170 gdk_gc_get_values ( gc, &values );
1171 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1174 GdkFunction vik_gc_get_function ( GdkGC *gc )
1176 static GdkGCValues values;
1177 gdk_gc_get_values ( gc, &values );
1178 return values.function;
1181 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1183 vvp->drawmode = drawmode;
1184 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1185 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1187 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1191 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1193 return vvp->drawmode;
1196 /******** triggering *******/
1197 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1199 vp->trigger = trigger;
1202 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1207 void vik_viewport_snapshot_save ( VikViewport *vp )
1209 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1212 void vik_viewport_snapshot_load ( VikViewport *vp )
1214 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1217 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1219 vp->half_drawn = half_drawn;
1222 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1224 return vp->half_drawn;
1228 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1230 const gchar *name = NULL;
1231 VikWindow *vw = NULL;
1232 GtkWidget *mode_button;
1235 vw = VIK_WINDOW_FROM_WIDGET(vv);
1236 mode_button = vik_window_get_drawmode_button(vw, mode);
1237 label = gtk_bin_get_child(GTK_BIN(mode_button));
1239 name = gtk_label_get_text ( GTK_LABEL(label) );
1245 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1247 VikCoord tleft, tright, bleft, bright;
1249 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1250 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1251 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1252 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1254 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1255 vik_coord_convert(&tright, VIK_COORD_LATLON);
1256 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1257 vik_coord_convert(&bright, VIK_COORD_LATLON);
1259 *max_lat = MAX(tleft.north_south, tright.north_south);
1260 *min_lat = MIN(bleft.north_south, bright.north_south);
1261 *max_lon = MAX(tright.east_west, bright.east_west);
1262 *min_lon = MIN(tleft.east_west, bleft.east_west);
1265 void vik_viewport_reset_copyrights ( VikViewport *vp )
1267 g_return_if_fail ( vp != NULL );
1268 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1269 g_slist_free ( vp->copyrights );
1270 vp->copyrights = NULL;
1274 * vik_viewport_add_copyright:
1276 * @copyright: new copyright to display
1278 * Add a copyright to display on viewport.
1280 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1282 g_return_if_fail ( vp != NULL );
1285 GSList *found = g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1286 if ( found == NULL )
1288 gchar *duple = g_strdup ( copyright );
1289 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );
1294 void vik_viewport_reset_logos ( VikViewport *vp )
1296 g_return_if_fail ( vp != NULL );
1297 /* do not free elem */
1298 g_slist_free ( vp->logos );
1302 void vik_viewport_add_logo ( VikViewport *vp, const GdkPixbuf *logo )
1304 g_return_if_fail ( vp != NULL );
1307 GdkPixbuf *found = NULL; /* FIXME (GdkPixbuf*)g_slist_find_custom ( vp->logos, logo, (GCompareFunc)== ); */
1308 if ( found == NULL )
1310 vp->logos = g_slist_prepend ( vp->logos, (gpointer)logo );