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 void vik_viewport_set_highlight_thickness ( VikViewport *vvp, gint thickness )
286 // Otherwise same GDK_* attributes as in vik_viewport_new_gc
287 gdk_gc_set_line_attributes ( vvp->highlight_gc, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
290 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
295 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
296 if ( gdk_color_parse ( colorname, &color ) )
297 gdk_gc_set_rgb_fg_color ( rv, &color );
299 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
300 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
304 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
308 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
309 gdk_gc_set_rgb_fg_color ( rv, color );
310 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
314 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
317 vvp->height = height;
318 if ( vvp->scr_buffer )
319 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
320 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
322 /* TODO trigger: only if this is enabled !!! */
323 if ( vvp->snapshot_buffer )
324 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
325 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
329 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
331 return vvp->scr_buffer;
334 gboolean vik_viewport_configure ( VikViewport *vvp )
336 g_return_val_if_fail ( vvp != NULL, TRUE );
338 vvp->width = GTK_WIDGET(vvp)->allocation.width;
339 vvp->height = GTK_WIDGET(vvp)->allocation.height;
341 if ( vvp->scr_buffer )
342 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
344 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
346 /* TODO trigger: only if enabled! */
347 if ( vvp->snapshot_buffer )
348 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
350 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
353 /* this is down here so it can get a GC (necessary?) */
354 if ( !vvp->background_gc )
356 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
357 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
359 if ( ! vvp->highlight_gc )
361 vvp->highlight_gc = vik_viewport_new_gc ( vvp, DEFAULT_HIGHLIGHT_COLOR, 1 );
362 vik_viewport_set_highlight_color ( vvp, DEFAULT_HIGHLIGHT_COLOR );
364 if ( !vvp->scale_bg_gc) {
365 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
371 static void viewport_finalize ( GObject *gob )
373 VikViewport *vvp = VIK_VIEWPORT(gob);
375 g_return_if_fail ( vvp != NULL );
377 if ( vvp->scr_buffer )
378 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
380 if ( vvp->snapshot_buffer )
381 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
383 if ( vvp->alpha_pixbuf )
384 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
386 if ( vvp->background_gc )
387 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
389 if ( vvp->highlight_gc )
390 g_object_unref ( G_OBJECT ( vvp->highlight_gc ) );
392 if ( vvp->scale_bg_gc ) {
393 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
394 vvp->scale_bg_gc = NULL;
397 G_OBJECT_CLASS(parent_class)->finalize(gob);
401 * vik_viewport_clear:
404 * Clear the whole viewport.
406 void vik_viewport_clear ( VikViewport *vvp )
408 g_return_if_fail ( vvp != NULL );
409 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
410 vik_viewport_reset_copyrights ( vvp );
411 vik_viewport_reset_logos ( vvp );
415 * vik_viewport_set_draw_scale:
417 * @draw_scale: new value
419 * Enable/Disable display of scale.
421 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
423 vvp->draw_scale = draw_scale;
426 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
428 return vvp->draw_scale;
431 void vik_viewport_draw_scale ( VikViewport *vvp )
433 g_return_if_fail ( vvp != NULL );
435 if ( vvp->draw_scale ) {
436 VikCoord left, right;
437 gdouble unit, base, diff, old_unit, old_diff, ratio;
438 gint odd, len, SCSIZE = 5, HEIGHT=10;
439 PangoFontDescription *pfd;
443 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
444 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
446 vik_units_distance_t dist_units = a_vik_get_units_distance ();
447 switch (dist_units) {
448 case VIK_UNITS_DISTANCE_KILOMETRES:
449 base = vik_coord_diff ( &left, &right ); // in meters
451 case VIK_UNITS_DISTANCE_MILES:
452 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
453 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
456 base = 1; // Keep the compiler happy
457 g_critical("Houston, we've had a problem. distance=%d", dist_units);
459 ratio = (vvp->width/SCSIZE)/base;
462 diff = fabs(base-unit);
466 while (diff <= old_diff) {
469 unit = unit * (odd%2 ? 5 : 2);
470 diff = fabs(base-unit);
476 /* white background */
477 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
478 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
479 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
480 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
481 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
482 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
484 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
485 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
486 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
487 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
488 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
489 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
492 for (i=1; i<5; i++) {
493 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
494 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
495 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
496 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
500 for (i=1; i<10; i++) {
501 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
502 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
503 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
504 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
507 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
508 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
509 pango_layout_set_font_description (pl, pfd);
510 pango_font_description_free (pfd);
512 switch (dist_units) {
513 case VIK_UNITS_DISTANCE_KILOMETRES:
515 sprintf(s, "%d km", (int)unit/1000);
517 sprintf(s, "%d m", (int)unit);
520 case VIK_UNITS_DISTANCE_MILES:
521 // Handle units in 0.1 miles
523 sprintf(s, "%0.1f miles", unit/10.0);
525 else if ((int)unit == 10.0) {
526 sprintf(s, "1 mile");
529 sprintf(s, "%d miles", (int)(unit/10.0));
533 g_critical("Houston, we've had a problem. distance=%d", dist_units);
535 pango_layout_set_text(pl, s, -1);
536 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
537 PAD + len + PAD, vvp->height - PAD - 10, pl);
543 void vik_viewport_draw_copyright ( VikViewport *vvp )
545 g_return_if_fail ( vvp != NULL );
547 PangoFontDescription *pfd;
549 PangoRectangle ink_rect, logical_rect;
552 /* compute copyrights string */
553 guint len = g_slist_length ( vvp->copyrights );
556 for (i = 0 ; i < len ; i++)
558 // Stop when buffer is full
559 int slen = strlen ( s );
563 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
565 // Only use part of this copyright that fits in the available space left
566 // remembering 1 character is left available for the appended space
567 int clen = strlen ( copyright );
568 if ( slen + clen > 126 ) {
572 strncat ( s, copyright, clen );
576 /* create pango layout */
577 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
578 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
579 pango_layout_set_font_description (pl, pfd);
580 pango_font_description_free (pfd);
582 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
585 pango_layout_set_text(pl, s, -1);
587 /* Use maximum of half the viewport width */
588 pango_layout_set_width ( pl, ( vvp->width / 2 - PAD ) * PANGO_SCALE );
589 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
590 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
591 vvp->width / 2, vvp->height - PAD - logical_rect.height, pl);
599 * vik_viewport_set_draw_centermark:
601 * @draw_centermark: new value
603 * Enable/Disable display of center mark.
605 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
607 vvp->draw_centermark = draw_centermark;
610 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
612 return vvp->draw_centermark;
615 void vik_viewport_draw_centermark ( VikViewport *vvp )
617 g_return_if_fail ( vvp != NULL );
619 if ( !vvp->draw_centermark )
624 int center_x = vvp->width/2;
625 int center_y = vvp->height/2;
626 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
628 /* white back ground */
629 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
630 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
631 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
632 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
633 /* black fore ground */
634 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
635 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
636 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
637 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
641 void vik_viewport_draw_logo ( VikViewport *vvp )
643 g_return_if_fail ( vvp != NULL );
645 guint len = g_slist_length ( vvp->logos );
646 gint x = vvp->width - PAD;
649 for (i = 0 ; i < len ; i++)
651 GdkPixbuf *logo = g_slist_nth_data ( vvp->logos, i );
652 gint width = gdk_pixbuf_get_width ( logo );
653 gint height = gdk_pixbuf_get_height ( logo );
654 vik_viewport_draw_pixbuf ( vvp, logo, 0, 0, x - width, y, width, height );
659 void vik_viewport_set_draw_highlight ( VikViewport *vvp, gboolean draw_highlight )
661 vvp->draw_highlight = draw_highlight;
664 gboolean vik_viewport_get_draw_highlight ( VikViewport *vvp )
666 return vvp->draw_highlight;
669 void vik_viewport_sync ( VikViewport *vvp )
671 g_return_if_fail ( vvp != NULL );
672 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);
675 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
679 g_return_if_fail ( vvp != NULL );
680 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);
686 x = vvp->width+x_off;
693 y = vvp->height+y_off;
696 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
697 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
700 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
702 g_return_if_fail ( vvp != NULL );
703 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
704 vvp->xmpp = vvp->ympp = xympp;
706 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
707 viewport_utm_zone_check(vvp);
710 /* or could do factor */
711 void vik_viewport_zoom_in ( VikViewport *vvp )
713 g_return_if_fail ( vvp != NULL );
714 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
719 viewport_utm_zone_check(vvp);
723 void vik_viewport_zoom_out ( VikViewport *vvp )
725 g_return_if_fail ( vvp != NULL );
726 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
731 viewport_utm_zone_check(vvp);
735 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
737 if ( vvp->xmpp == vvp->ympp )
742 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
747 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
752 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
754 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
756 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
757 viewport_utm_zone_check(vvp);
761 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
763 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
765 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
766 viewport_utm_zone_check(vvp);
771 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
773 g_return_val_if_fail ( vvp != NULL, NULL );
774 return &(vvp->center);
777 /* called every time we update coordinates/zoom */
778 static void viewport_utm_zone_check ( VikViewport *vvp )
780 if ( vvp->coord_mode == VIK_COORD_UTM )
784 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
785 a_coords_latlon_to_utm ( &ll, &utm );
786 if ( utm.zone != vvp->center.utm_zone )
787 *((struct UTM *)(&vvp->center)) = utm;
789 /* misc. stuff so we don't have to check later */
790 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
791 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
795 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
797 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
798 if ( vvp->coord_mode == VIK_COORD_UTM )
799 viewport_utm_zone_check ( vvp );
802 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
804 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
805 if ( vvp->coord_mode == VIK_COORD_UTM )
806 viewport_utm_zone_check ( vvp );
809 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
811 vvp->center = *coord;
812 if ( vvp->coord_mode == VIK_COORD_UTM )
813 viewport_utm_zone_check ( vvp );
816 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
818 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
820 /* get center, then just offset */
821 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
822 ul->mode = VIK_COORD_UTM;
825 ul->north_south += (vvp->ympp * vvp->height / 2);
826 ul->east_west -= (vvp->xmpp * vvp->width / 2);
827 br->north_south -= (vvp->ympp * vvp->height / 2);
828 br->east_west += (vvp->xmpp * vvp->width / 2);
831 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
833 if ( vvp->coord_mode == VIK_COORD_UTM ) {
834 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
835 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
840 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
842 if ( vvp->coord_mode == VIK_COORD_UTM ) {
844 g_assert ( vvp != NULL );
845 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
846 return coord.utm_zone;
851 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
853 if ( vvp->coord_mode == VIK_COORD_UTM ) {
855 g_assert ( vvp != NULL );
856 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
857 return coord.utm_zone;
863 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
865 g_return_if_fail ( vvp != NULL );
866 if ( vvp->coord_mode == VIK_COORD_UTM ) {
867 /* slightly optimized */
868 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
869 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
870 viewport_utm_zone_check ( vvp );
873 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
874 vik_viewport_set_center_coord ( vvp, &tmp );
878 gint vik_viewport_get_width( VikViewport *vvp )
880 g_return_val_if_fail ( vvp != NULL, 0 );
884 gint vik_viewport_get_height( VikViewport *vvp )
886 g_return_val_if_fail ( vvp != NULL, 0 );
890 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
892 g_return_if_fail ( vvp != NULL );
894 if ( vvp->coord_mode == VIK_COORD_UTM ) {
896 struct UTM *utm = (struct UTM *) coord;
897 coord->mode = VIK_COORD_UTM;
899 utm->zone = vvp->center.utm_zone;
900 utm->letter = vvp->center.utm_letter;
901 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
902 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
903 utm->zone += zone_delta;
904 utm->easting -= zone_delta * vvp->utm_zone_width;
905 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
906 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
907 coord->mode = VIK_COORD_LATLON;
908 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
909 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
910 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
911 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
912 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);
913 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
915 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
916 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
919 --> THIS IS JUNK HERE.
920 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
922 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
923 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
929 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
932 g_return_if_fail ( vvp != NULL );
934 if ( coord->mode != vvp->coord_mode )
936 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
937 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
941 if ( vvp->coord_mode == VIK_COORD_UTM ) {
942 struct UTM *center = (struct UTM *) &(vvp->center);
943 struct UTM *utm = (struct UTM *) coord;
944 if ( center->zone != utm->zone && vvp->one_utm_zone )
946 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
950 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
951 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
952 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
953 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
954 struct LatLon *center = (struct LatLon *) &(vvp->center);
955 struct LatLon *ll = (struct LatLon *) coord;
957 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
958 /* FIXMERCATOR: Optimize */
959 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
960 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
961 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
962 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 );
964 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
965 /* FIXMERCATOR: Optimize */
966 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
967 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
972 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
974 if ( *x1 > 20000 || *x1 < -20000 ) {
975 gdouble shrinkfactor = ABS(20000.0 / *x1);
976 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
977 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
978 } else if ( *y1 > 20000 || *y1 < -20000 ) {
979 gdouble shrinkfactor = ABS(20000.0 / *x1);
980 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
981 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
982 } else if ( *x2 > 20000 || *x2 < -20000 ) {
983 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
984 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
985 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
986 } else if ( *y2 > 20000 || *y2 < -20000 ) {
987 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
988 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
989 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
993 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
995 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
996 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
997 /*** clipping, yeah! ***/
998 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
999 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
1003 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
1005 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
1006 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
1009 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
1011 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
1012 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
1015 /* shouldn't use this -- slow -- change the alpha channel instead. */
1016 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
1017 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
1019 gint real_dest_x = MAX(dest_x,0);
1020 gint real_dest_y = MAX(dest_y,0);
1023 return; /* don't waste your time */
1025 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
1027 if ( vvp->alpha_pixbuf )
1028 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
1029 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
1030 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
1031 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
1034 w = MIN(w,vvp->width - dest_x);
1035 h = MIN(h,vvp->height - dest_y);
1037 /* check that we are drawing within boundaries. */
1038 src_x += (real_dest_x - dest_x);
1039 src_y += (real_dest_y - dest_y);
1040 w -= (real_dest_x - dest_x);
1041 h -= (real_dest_y - dest_y);
1043 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
1044 real_dest_x, real_dest_y, 0, 0, w, h );
1046 /* do a composite */
1047 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
1049 /* draw pixbuf_tmp */
1050 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
1053 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
1054 gint dest_x, gint dest_y, gint w, gint h )
1056 gdk_draw_pixbuf ( vvp->scr_buffer,
1057 // GTK_WIDGET(vvp)->style->black_gc,
1060 src_x, src_y, dest_x, dest_y, w, h,
1061 GDK_RGB_DITHER_NONE, 0, 0 );
1064 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
1066 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
1070 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
1072 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
1075 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
1078 return vvp->coord_mode;
1081 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
1083 g_return_if_fail ( vvp != NULL );
1084 vvp->coord_mode = mode;
1085 vik_coord_convert ( &(vvp->center), mode );
1088 /* Thanks GPSDrive */
1089 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 )
1092 gdouble dif, lat, lon;
1093 double Ra = Radius[90+(gint)zero_lat];
1095 px = (mapSizeX2 - x) * pixelfact_x;
1096 py = (-mapSizeY2 + y) * pixelfact_y;
1098 lat = zero_lat - py / Ra;
1099 lat = zero_lat - py / Ra;
1103 cos (lat * DEG2RAD));
1105 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
1106 lat = lat - dif / 1.5;
1110 cos (lat * DEG2RAD));
1117 /* Thanks GPSDrive */
1118 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 )
1122 gint mapSizeX = 2 * mapSizeX2;
1123 gint mapSizeY = 2 * mapSizeY2;
1125 g_assert ( lt >= -90.0 && lt <= 90.0 );
1126 // lg *= rad2deg; // FIXME, optimize equations
1128 Ra = Radius[90+(gint)lt];
1130 cos (lt*DEG2RAD) * (lg - zero_long);
1131 *y = Ra * (lt - zero_lat);
1132 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
1133 *y = *y + dif / 1.85;
1134 *x = *x / pixelfact_x;
1135 *y = *y / pixelfact_y;
1136 *x = mapSizeX2 - *x;
1138 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1143 static void viewport_init_ra()
1145 static gboolean done_before = FALSE;
1149 for ( i = -90; i <= 90; i++)
1150 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
1155 double calcR (double lat)
1157 double a = 6378.137, r, sc, x, y, z;
1158 double e2 = 0.081082 * 0.081082;
1160 * the radius of curvature of an ellipsoidal Earth in the plane of the
1161 * meridian is given by
1163 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1166 * where a is the equatorial radius, b is the polar radius, and e is
1167 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1169 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1170 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1171 * = 0.081082 Eccentricity
1174 lat = lat * DEG2RAD;
1177 z = 1.0 - e2 * sc * sc;
1184 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1186 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1189 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1191 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1192 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1195 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1197 static GdkGCValues values;
1198 gdk_gc_get_values ( gc, &values );
1199 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1202 GdkFunction vik_gc_get_function ( GdkGC *gc )
1204 static GdkGCValues values;
1205 gdk_gc_get_values ( gc, &values );
1206 return values.function;
1209 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1211 vvp->drawmode = drawmode;
1212 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1213 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1215 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1219 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1221 return vvp->drawmode;
1224 /******** triggering *******/
1225 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1227 vp->trigger = trigger;
1230 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1235 void vik_viewport_snapshot_save ( VikViewport *vp )
1237 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1240 void vik_viewport_snapshot_load ( VikViewport *vp )
1242 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1245 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1247 vp->half_drawn = half_drawn;
1250 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1252 return vp->half_drawn;
1256 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1258 const gchar *name = NULL;
1259 VikWindow *vw = NULL;
1260 GtkWidget *mode_button;
1263 vw = VIK_WINDOW_FROM_WIDGET(vv);
1264 mode_button = vik_window_get_drawmode_button(vw, mode);
1265 label = gtk_bin_get_child(GTK_BIN(mode_button));
1267 name = gtk_label_get_text ( GTK_LABEL(label) );
1273 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1275 VikCoord tleft, tright, bleft, bright;
1277 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1278 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1279 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1280 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1282 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1283 vik_coord_convert(&tright, VIK_COORD_LATLON);
1284 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1285 vik_coord_convert(&bright, VIK_COORD_LATLON);
1287 *max_lat = MAX(tleft.north_south, tright.north_south);
1288 *min_lat = MIN(bleft.north_south, bright.north_south);
1289 *max_lon = MAX(tright.east_west, bright.east_west);
1290 *min_lon = MIN(tleft.east_west, bleft.east_west);
1293 void vik_viewport_reset_copyrights ( VikViewport *vp )
1295 g_return_if_fail ( vp != NULL );
1296 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1297 g_slist_free ( vp->copyrights );
1298 vp->copyrights = NULL;
1302 * vik_viewport_add_copyright:
1304 * @copyright: new copyright to display
1306 * Add a copyright to display on viewport.
1308 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1310 g_return_if_fail ( vp != NULL );
1313 GSList *found = g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1314 if ( found == NULL )
1316 gchar *duple = g_strdup ( copyright );
1317 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );
1322 void vik_viewport_reset_logos ( VikViewport *vp )
1324 g_return_if_fail ( vp != NULL );
1325 /* do not free elem */
1326 g_slist_free ( vp->logos );
1330 void vik_viewport_add_logo ( VikViewport *vp, const GdkPixbuf *logo )
1332 g_return_if_fail ( vp != NULL );
1335 GdkPixbuf *found = NULL; /* FIXME (GdkPixbuf*)g_slist_find_custom ( vp->logos, logo, (GCompareFunc)== ); */
1336 if ( found == NULL )
1338 vp->logos = g_slist_prepend ( vp->logos, (gpointer)logo );