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_class_init ( VikViewportClass *klass );
57 static void viewport_init ( VikViewport *vvp );
58 static void viewport_finalize ( GObject *gob );
59 static void viewport_utm_zone_check ( VikViewport *vvp );
61 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 );
62 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 );
63 double calcR (double lat);
65 static double Radius[181];
66 static void viewport_init_ra();
68 static GObjectClass *parent_class;
72 GtkDrawingArea drawing_area;
73 GdkPixmap *scr_buffer;
76 VikCoordMode coord_mode;
79 GdkPixbuf *alpha_pixbuf;
80 guint8 alpha_pixbuf_width;
81 guint8 alpha_pixbuf_height;
83 gdouble utm_zone_width;
84 gboolean one_utm_zone;
87 GdkColor background_color;
93 /* Wether or not display OSD info */
95 gboolean draw_centermark;
96 gboolean draw_highlight;
98 GdkColor highlight_color;
100 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
101 VikViewportDrawMode drawmode;
103 /* handy conversion factors which make google plotting extremely fast */
104 gdouble google_calcx_fact;
105 gdouble google_calcy_fact;
106 gdouble google_calcx_rev_fact;
107 gdouble google_calcy_rev_fact;
111 GdkPixmap *snapshot_buffer;
116 viewport_utm_zone_width ( VikViewport *vvp )
118 if ( vvp->coord_mode == VIK_COORD_UTM ) {
121 /* get latitude of screen bottom */
122 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
123 utm.northing -= vvp -> height * vvp -> ympp / 2;
124 a_coords_utm_to_latlon ( &utm, &ll );
127 ll.lon = (utm.zone - 1) * 6 - 180 ;
128 a_coords_latlon_to_utm ( &ll, &utm);
129 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
135 GType vik_viewport_get_type (void)
137 static GType vvp_type = 0;
141 static const GTypeInfo vvp_info =
143 sizeof (VikViewportClass),
144 NULL, /* base_init */
145 NULL, /* base_finalize */
146 (GClassInitFunc) viewport_class_init,
147 NULL, /* class_finalize */
148 NULL, /* class_data */
149 sizeof (VikViewport),
151 (GInstanceInitFunc) viewport_init,
153 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
158 static void viewport_class_init ( VikViewportClass *klass )
161 GObjectClass *object_class;
163 object_class = G_OBJECT_CLASS (klass);
165 object_class->finalize = viewport_finalize;
167 parent_class = g_type_class_peek_parent (klass);
170 VikViewport *vik_viewport_new ()
172 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
176 static void viewport_init ( VikViewport *vvp )
182 ll.lat = a_vik_get_default_lat();
183 ll.lon = a_vik_get_default_long();
184 a_coords_latlon_to_utm ( &ll, &utm );
186 /* TODO: not static */
189 vvp->coord_mode = VIK_COORD_LATLON;
190 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
191 vvp->center.mode = VIK_COORD_LATLON;
192 vvp->center.north_south = ll.lat;
193 vvp->center.east_west = ll.lon;
194 vvp->center.utm_zone = (int)utm.zone;
195 vvp->center.utm_letter = utm.letter;
196 vvp->scr_buffer = NULL;
197 vvp->alpha_pixbuf = NULL;
198 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
199 vvp->utm_zone_width = 0.0;
200 vvp->background_gc = NULL;
201 vvp->highlight_gc = NULL;
202 vvp->scale_bg_gc = NULL;
204 vvp->copyrights = NULL;
206 vvp->draw_scale = TRUE;
207 vvp->draw_centermark = TRUE;
208 vvp->draw_highlight = TRUE;
211 vvp->snapshot_buffer = NULL;
212 vvp->half_drawn = FALSE;
214 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
216 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
219 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
221 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
222 *rv = vvp->background_color;
226 /* returns pointer to internal static storage, changes next time function called, use quickly */
227 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
229 static gchar color[8];
230 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));
234 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
236 g_assert ( vvp && vvp->background_gc );
237 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
238 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
240 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
243 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
245 g_assert ( vvp && vvp->background_gc );
246 vvp->background_color = *color;
247 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
250 GdkColor *vik_viewport_get_highlight_gdkcolor ( VikViewport *vvp )
252 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
253 *rv = vvp->highlight_color;
257 /* returns pointer to internal static storage, changes next time function called, use quickly */
258 const gchar *vik_viewport_get_highlight_color ( VikViewport *vvp )
260 static gchar color[8];
261 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));
265 void vik_viewport_set_highlight_color ( VikViewport *vvp, const gchar *colorname )
267 g_assert ( vvp->highlight_gc );
268 gdk_color_parse ( colorname, &(vvp->highlight_color) );
269 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, &(vvp->highlight_color) );
272 void vik_viewport_set_highlight_gdkcolor ( VikViewport *vvp, GdkColor *color )
274 g_assert ( vvp->highlight_gc );
275 vvp->highlight_color = *color;
276 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, color );
279 GdkGC *vik_viewport_get_gc_highlight ( VikViewport *vvp )
281 return vvp->highlight_gc;
284 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
289 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
290 if ( gdk_color_parse ( colorname, &color ) )
291 gdk_gc_set_rgb_fg_color ( rv, &color );
293 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
294 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
298 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
302 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
303 gdk_gc_set_rgb_fg_color ( rv, color );
304 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
308 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
311 vvp->height = height;
312 if ( vvp->scr_buffer )
313 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
314 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
316 /* TODO trigger: only if this is enabled !!! */
317 if ( vvp->snapshot_buffer )
318 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
319 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
323 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
325 return vvp->scr_buffer;
328 gboolean vik_viewport_configure ( VikViewport *vvp )
330 g_return_val_if_fail ( vvp != NULL, TRUE );
332 vvp->width = GTK_WIDGET(vvp)->allocation.width;
333 vvp->height = GTK_WIDGET(vvp)->allocation.height;
335 if ( vvp->scr_buffer )
336 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
338 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
340 /* TODO trigger: only if enabled! */
341 if ( vvp->snapshot_buffer )
342 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
344 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
347 /* this is down here so it can get a GC (necessary?) */
348 if ( !vvp->background_gc )
350 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
351 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
353 if ( ! vvp->highlight_gc )
355 vvp->highlight_gc = vik_viewport_new_gc ( vvp, DEFAULT_HIGHLIGHT_COLOR, 1 );
356 vik_viewport_set_highlight_color ( vvp, DEFAULT_HIGHLIGHT_COLOR );
358 if ( !vvp->scale_bg_gc) {
359 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
365 static void viewport_finalize ( GObject *gob )
367 VikViewport *vvp = VIK_VIEWPORT(gob);
369 g_return_if_fail ( vvp != NULL );
371 if ( vvp->scr_buffer )
372 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
374 if ( vvp->snapshot_buffer )
375 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
377 if ( vvp->alpha_pixbuf )
378 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
380 if ( vvp->background_gc )
381 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
383 if ( vvp->highlight_gc )
384 g_object_unref ( G_OBJECT ( vvp->highlight_gc ) );
386 if ( vvp->scale_bg_gc ) {
387 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
388 vvp->scale_bg_gc = NULL;
391 G_OBJECT_CLASS(parent_class)->finalize(gob);
395 * vik_viewport_clear:
398 * Clear the whole viewport.
400 void vik_viewport_clear ( VikViewport *vvp )
402 g_return_if_fail ( vvp != NULL );
403 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
404 vik_viewport_reset_copyrights ( vvp );
405 vik_viewport_reset_logos ( vvp );
409 * vik_viewport_set_draw_scale:
411 * @draw_scale: new value
413 * Enable/Disable display of scale.
415 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
417 vvp->draw_scale = draw_scale;
420 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
422 return vvp->draw_scale;
425 void vik_viewport_draw_scale ( VikViewport *vvp )
427 g_return_if_fail ( vvp != NULL );
429 if ( vvp->draw_scale ) {
430 VikCoord left, right;
431 gdouble unit, base, diff, old_unit, old_diff, ratio;
432 gint odd, len, SCSIZE = 5, HEIGHT=10;
433 PangoFontDescription *pfd;
437 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
438 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
440 vik_units_distance_t dist_units = a_vik_get_units_distance ();
441 switch (dist_units) {
442 case VIK_UNITS_DISTANCE_KILOMETRES:
443 base = vik_coord_diff ( &left, &right ); // in meters
445 case VIK_UNITS_DISTANCE_MILES:
446 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
447 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
450 base = 1; // Keep the compiler happy
451 g_critical("Houston, we've had a problem. distance=%d", dist_units);
453 ratio = (vvp->width/SCSIZE)/base;
456 diff = fabs(base-unit);
460 while (diff <= old_diff) {
463 unit = unit * (odd%2 ? 5 : 2);
464 diff = fabs(base-unit);
470 /* white background */
471 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
472 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
473 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
474 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
475 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
476 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
478 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
479 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
480 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
481 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
482 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
483 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
486 for (i=1; i<5; i++) {
487 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
488 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
489 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
490 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
494 for (i=1; i<10; i++) {
495 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
496 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
497 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
498 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
501 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
502 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
503 pango_layout_set_font_description (pl, pfd);
504 pango_font_description_free (pfd);
506 switch (dist_units) {
507 case VIK_UNITS_DISTANCE_KILOMETRES:
509 sprintf(s, "%d km", (int)unit/1000);
511 sprintf(s, "%d m", (int)unit);
514 case VIK_UNITS_DISTANCE_MILES:
515 // Handle units in 0.1 miles
517 sprintf(s, "%0.1f miles", unit/10.0);
519 else if ((int)unit == 10.0) {
520 sprintf(s, "1 mile");
523 sprintf(s, "%d miles", (int)(unit/10.0));
527 g_critical("Houston, we've had a problem. distance=%d", dist_units);
529 pango_layout_set_text(pl, s, -1);
530 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
531 PAD + len + PAD, vvp->height - PAD - 10, pl);
537 void vik_viewport_draw_copyright ( VikViewport *vvp )
539 g_return_if_fail ( vvp != NULL );
541 PangoFontDescription *pfd;
543 PangoRectangle ink_rect, logical_rect;
546 /* compute copyrights string */
547 guint len = g_slist_length ( vvp->copyrights );
549 for (i = 0 ; i < len ; i++)
551 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
552 strcat ( s, copyright );
556 /* create pango layout */
557 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
558 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
559 pango_layout_set_font_description (pl, pfd);
560 pango_font_description_free (pfd);
562 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
565 pango_layout_set_text(pl, s, -1);
567 /* Use maximum of half the viewport width */
568 pango_layout_set_width ( pl, ( vvp->width / 2 - PAD ) * PANGO_SCALE );
569 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
570 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
571 vvp->width / 2, vvp->height - PAD - logical_rect.height, pl);
579 * vik_viewport_set_draw_centermark:
581 * @draw_centermark: new value
583 * Enable/Disable display of center mark.
585 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
587 vvp->draw_centermark = draw_centermark;
590 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
592 return vvp->draw_centermark;
595 void vik_viewport_draw_centermark ( VikViewport *vvp )
597 g_return_if_fail ( vvp != NULL );
599 if ( !vvp->draw_centermark )
604 int center_x = vvp->width/2;
605 int center_y = vvp->height/2;
606 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
608 /* white back ground */
609 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
610 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
611 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
612 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
613 /* black fore ground */
614 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
615 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
616 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
617 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
621 void vik_viewport_draw_logo ( VikViewport *vvp )
623 g_return_if_fail ( vvp != NULL );
625 /* compute copyrights string */
626 guint len = g_slist_length ( vvp->logos );
627 gint x = vvp->width - PAD;
630 for (i = 0 ; i < len ; i++)
632 GdkPixbuf *logo = g_slist_nth_data ( vvp->logos, i );
633 gint width = gdk_pixbuf_get_width ( logo );
634 gint height = gdk_pixbuf_get_height ( logo );
635 vik_viewport_draw_pixbuf ( vvp, logo, 0, 0, x - width, y, width, height );
640 void vik_viewport_set_draw_highlight ( VikViewport *vvp, gboolean draw_highlight )
642 vvp->draw_highlight = draw_highlight;
645 gboolean vik_viewport_get_draw_highlight ( VikViewport *vvp )
647 return vvp->draw_highlight;
650 void vik_viewport_sync ( VikViewport *vvp )
652 g_return_if_fail ( vvp != NULL );
653 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);
656 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
660 g_return_if_fail ( vvp != NULL );
661 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);
667 x = vvp->width+x_off;
674 y = vvp->height+y_off;
677 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
678 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
681 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
683 g_return_if_fail ( vvp != NULL );
684 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
685 vvp->xmpp = vvp->ympp = xympp;
687 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
688 viewport_utm_zone_check(vvp);
691 /* or could do factor */
692 void vik_viewport_zoom_in ( VikViewport *vvp )
694 g_return_if_fail ( vvp != NULL );
695 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
700 viewport_utm_zone_check(vvp);
704 void vik_viewport_zoom_out ( VikViewport *vvp )
706 g_return_if_fail ( vvp != NULL );
707 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
712 viewport_utm_zone_check(vvp);
716 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
718 if ( vvp->xmpp == vvp->ympp )
723 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
728 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
733 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
735 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
737 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
738 viewport_utm_zone_check(vvp);
742 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
744 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
746 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
747 viewport_utm_zone_check(vvp);
752 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
754 g_return_val_if_fail ( vvp != NULL, NULL );
755 return &(vvp->center);
758 /* called every time we update coordinates/zoom */
759 static void viewport_utm_zone_check ( VikViewport *vvp )
761 if ( vvp->coord_mode == VIK_COORD_UTM )
765 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
766 a_coords_latlon_to_utm ( &ll, &utm );
767 if ( utm.zone != vvp->center.utm_zone )
768 *((struct UTM *)(&vvp->center)) = utm;
770 /* misc. stuff so we don't have to check later */
771 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
772 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
776 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
778 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
779 if ( vvp->coord_mode == VIK_COORD_UTM )
780 viewport_utm_zone_check ( vvp );
783 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
785 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
786 if ( vvp->coord_mode == VIK_COORD_UTM )
787 viewport_utm_zone_check ( vvp );
790 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
792 vvp->center = *coord;
793 if ( vvp->coord_mode == VIK_COORD_UTM )
794 viewport_utm_zone_check ( vvp );
797 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
799 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
801 /* get center, then just offset */
802 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
803 ul->mode = VIK_COORD_UTM;
806 ul->north_south += (vvp->ympp * vvp->height / 2);
807 ul->east_west -= (vvp->xmpp * vvp->width / 2);
808 br->north_south -= (vvp->ympp * vvp->height / 2);
809 br->east_west += (vvp->xmpp * vvp->width / 2);
812 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
814 if ( vvp->coord_mode == VIK_COORD_UTM ) {
815 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
816 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
821 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
823 if ( vvp->coord_mode == VIK_COORD_UTM ) {
825 g_assert ( vvp != NULL );
826 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
827 return coord.utm_zone;
832 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
834 if ( vvp->coord_mode == VIK_COORD_UTM ) {
836 g_assert ( vvp != NULL );
837 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
838 return coord.utm_zone;
844 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
846 g_return_if_fail ( vvp != NULL );
847 if ( vvp->coord_mode == VIK_COORD_UTM ) {
848 /* slightly optimized */
849 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
850 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
851 viewport_utm_zone_check ( vvp );
854 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
855 vik_viewport_set_center_coord ( vvp, &tmp );
859 gint vik_viewport_get_width( VikViewport *vvp )
861 g_return_val_if_fail ( vvp != NULL, 0 );
865 gint vik_viewport_get_height( VikViewport *vvp )
867 g_return_val_if_fail ( vvp != NULL, 0 );
871 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
873 g_return_if_fail ( vvp != NULL );
875 if ( vvp->coord_mode == VIK_COORD_UTM ) {
877 struct UTM *utm = (struct UTM *) coord;
878 coord->mode = VIK_COORD_UTM;
880 utm->zone = vvp->center.utm_zone;
881 utm->letter = vvp->center.utm_letter;
882 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
883 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
884 utm->zone += zone_delta;
885 utm->easting -= zone_delta * vvp->utm_zone_width;
886 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
887 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
888 coord->mode = VIK_COORD_LATLON;
889 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
890 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
891 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
892 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
893 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);
894 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
896 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
897 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
900 --> THIS IS JUNK HERE.
901 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
903 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
904 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
910 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
913 g_return_if_fail ( vvp != NULL );
915 if ( coord->mode != vvp->coord_mode )
917 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
918 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
922 if ( vvp->coord_mode == VIK_COORD_UTM ) {
923 struct UTM *center = (struct UTM *) &(vvp->center);
924 struct UTM *utm = (struct UTM *) coord;
925 if ( center->zone != utm->zone && vvp->one_utm_zone )
927 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
931 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
932 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
933 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
934 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
935 struct LatLon *center = (struct LatLon *) &(vvp->center);
936 struct LatLon *ll = (struct LatLon *) coord;
938 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
939 /* FIXMERCATOR: Optimize */
940 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
941 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
942 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
943 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 );
945 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
946 /* FIXMERCATOR: Optimize */
947 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
948 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
953 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
955 if ( *x1 > 20000 || *x1 < -20000 ) {
956 gdouble shrinkfactor = ABS(20000.0 / *x1);
957 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
958 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
959 } else if ( *y1 > 20000 || *y1 < -20000 ) {
960 gdouble shrinkfactor = ABS(20000.0 / *x1);
961 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
962 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
963 } else if ( *x2 > 20000 || *x2 < -20000 ) {
964 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
965 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
966 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
967 } else if ( *y2 > 20000 || *y2 < -20000 ) {
968 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
969 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
970 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
974 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
976 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
977 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
978 /*** clipping, yeah! ***/
979 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
980 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
984 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
986 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
987 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
990 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
992 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
993 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
996 /* shouldn't use this -- slow -- change the alpha channel instead. */
997 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
998 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
1000 gint real_dest_x = MAX(dest_x,0);
1001 gint real_dest_y = MAX(dest_y,0);
1004 return; /* don't waste your time */
1006 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
1008 if ( vvp->alpha_pixbuf )
1009 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
1010 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
1011 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
1012 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
1015 w = MIN(w,vvp->width - dest_x);
1016 h = MIN(h,vvp->height - dest_y);
1018 /* check that we are drawing within boundaries. */
1019 src_x += (real_dest_x - dest_x);
1020 src_y += (real_dest_y - dest_y);
1021 w -= (real_dest_x - dest_x);
1022 h -= (real_dest_y - dest_y);
1024 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
1025 real_dest_x, real_dest_y, 0, 0, w, h );
1027 /* do a composite */
1028 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
1030 /* draw pixbuf_tmp */
1031 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
1034 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
1035 gint dest_x, gint dest_y, gint w, gint h )
1037 gdk_draw_pixbuf ( vvp->scr_buffer,
1038 // GTK_WIDGET(vvp)->style->black_gc,
1041 src_x, src_y, dest_x, dest_y, w, h,
1042 GDK_RGB_DITHER_NONE, 0, 0 );
1045 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
1047 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
1051 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
1053 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
1056 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
1059 return vvp->coord_mode;
1062 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
1064 g_return_if_fail ( vvp != NULL );
1065 vvp->coord_mode = mode;
1066 vik_coord_convert ( &(vvp->center), mode );
1069 /* Thanks GPSDrive */
1070 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 )
1073 gdouble dif, lat, lon;
1074 double Ra = Radius[90+(gint)zero_lat];
1076 px = (mapSizeX2 - x) * pixelfact_x;
1077 py = (-mapSizeY2 + y) * pixelfact_y;
1079 lat = zero_lat - py / Ra;
1080 lat = zero_lat - py / Ra;
1084 cos (lat * DEG2RAD));
1086 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
1087 lat = lat - dif / 1.5;
1091 cos (lat * DEG2RAD));
1098 /* Thanks GPSDrive */
1099 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 )
1103 gint mapSizeX = 2 * mapSizeX2;
1104 gint mapSizeY = 2 * mapSizeY2;
1106 g_assert ( lt >= -90.0 && lt <= 90.0 );
1107 // lg *= rad2deg; // FIXME, optimize equations
1109 Ra = Radius[90+(gint)lt];
1111 cos (lt*DEG2RAD) * (lg - zero_long);
1112 *y = Ra * (lt - zero_lat);
1113 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
1114 *y = *y + dif / 1.85;
1115 *x = *x / pixelfact_x;
1116 *y = *y / pixelfact_y;
1117 *x = mapSizeX2 - *x;
1119 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1124 static void viewport_init_ra()
1126 static gboolean done_before = FALSE;
1130 for ( i = -90; i <= 90; i++)
1131 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
1136 double calcR (double lat)
1138 double a = 6378.137, r, sc, x, y, z;
1139 double e2 = 0.081082 * 0.081082;
1141 * the radius of curvature of an ellipsoidal Earth in the plane of the
1142 * meridian is given by
1144 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1147 * where a is the equatorial radius, b is the polar radius, and e is
1148 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1150 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1151 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1152 * = 0.081082 Eccentricity
1155 lat = lat * DEG2RAD;
1158 z = 1.0 - e2 * sc * sc;
1165 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1167 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1170 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1172 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1173 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1176 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1178 static GdkGCValues values;
1179 gdk_gc_get_values ( gc, &values );
1180 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1183 GdkFunction vik_gc_get_function ( GdkGC *gc )
1185 static GdkGCValues values;
1186 gdk_gc_get_values ( gc, &values );
1187 return values.function;
1190 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1192 vvp->drawmode = drawmode;
1193 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1194 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1196 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1200 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1202 return vvp->drawmode;
1205 /******** triggering *******/
1206 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1208 vp->trigger = trigger;
1211 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1216 void vik_viewport_snapshot_save ( VikViewport *vp )
1218 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1221 void vik_viewport_snapshot_load ( VikViewport *vp )
1223 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1226 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1228 vp->half_drawn = half_drawn;
1231 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1233 return vp->half_drawn;
1237 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1239 const gchar *name = NULL;
1240 VikWindow *vw = NULL;
1241 GtkWidget *mode_button;
1244 vw = VIK_WINDOW_FROM_WIDGET(vv);
1245 mode_button = vik_window_get_drawmode_button(vw, mode);
1246 label = gtk_bin_get_child(GTK_BIN(mode_button));
1248 name = gtk_label_get_text ( GTK_LABEL(label) );
1254 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1256 VikCoord tleft, tright, bleft, bright;
1258 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1259 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1260 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1261 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1263 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1264 vik_coord_convert(&tright, VIK_COORD_LATLON);
1265 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1266 vik_coord_convert(&bright, VIK_COORD_LATLON);
1268 *max_lat = MAX(tleft.north_south, tright.north_south);
1269 *min_lat = MIN(bleft.north_south, bright.north_south);
1270 *max_lon = MAX(tright.east_west, bright.east_west);
1271 *min_lon = MIN(tleft.east_west, bleft.east_west);
1274 void vik_viewport_reset_copyrights ( VikViewport *vp )
1276 g_return_if_fail ( vp != NULL );
1277 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1278 g_slist_free ( vp->copyrights );
1279 vp->copyrights = NULL;
1283 * vik_viewport_add_copyright:
1285 * @copyright: new copyright to display
1287 * Add a copyright to display on viewport.
1289 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1291 g_return_if_fail ( vp != NULL );
1294 gchar *found = (gchar*)g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1295 if ( found == NULL )
1297 gchar *duple = g_strdup ( copyright );
1298 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );
1303 void vik_viewport_reset_logos ( VikViewport *vp )
1305 g_return_if_fail ( vp != NULL );
1306 /* do not free elem */
1307 g_slist_free ( vp->logos );
1311 void vik_viewport_add_logo ( VikViewport *vp, const GdkPixbuf *logo )
1313 g_return_if_fail ( vp != NULL );
1316 GdkPixbuf *found = NULL; /* FIXME (GdkPixbuf*)g_slist_find_custom ( vp->logos, logo, (GCompareFunc)== ); */
1317 if ( found == NULL )
1319 vp->logos = g_slist_prepend ( vp->logos, (gpointer)logo );