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;
103 GdkPixmap *snapshot_buffer;
108 viewport_utm_zone_width ( VikViewport *vvp )
110 if ( vvp->coord_mode == VIK_COORD_UTM ) {
113 /* get latitude of screen bottom */
114 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
115 utm.northing -= vvp -> height * vvp -> ympp / 2;
116 a_coords_utm_to_latlon ( &utm, &ll );
119 ll.lon = (utm.zone - 1) * 6 - 180 ;
120 a_coords_latlon_to_utm ( &ll, &utm);
121 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
126 G_DEFINE_TYPE (VikViewport, vik_viewport, GTK_TYPE_DRAWING_AREA)
129 vik_viewport_class_init ( VikViewportClass *klass )
132 GObjectClass *object_class;
134 object_class = G_OBJECT_CLASS (klass);
136 object_class->finalize = viewport_finalize;
138 parent_class = g_type_class_peek_parent (klass);
141 VikViewport *vik_viewport_new ()
143 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
148 vik_viewport_init ( VikViewport *vvp )
154 ll.lat = a_vik_get_default_lat();
155 ll.lon = a_vik_get_default_long();
156 a_coords_latlon_to_utm ( &ll, &utm );
158 /* TODO: not static */
161 vvp->coord_mode = VIK_COORD_LATLON;
162 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
163 vvp->center.mode = VIK_COORD_LATLON;
164 vvp->center.north_south = ll.lat;
165 vvp->center.east_west = ll.lon;
166 vvp->center.utm_zone = (int)utm.zone;
167 vvp->center.utm_letter = utm.letter;
168 vvp->scr_buffer = NULL;
169 vvp->alpha_pixbuf = NULL;
170 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
171 vvp->utm_zone_width = 0.0;
172 vvp->background_gc = NULL;
173 vvp->highlight_gc = NULL;
174 vvp->scale_bg_gc = NULL;
176 vvp->copyrights = NULL;
178 vvp->draw_scale = TRUE;
179 vvp->draw_centermark = TRUE;
180 vvp->draw_highlight = TRUE;
183 vvp->snapshot_buffer = NULL;
184 vvp->half_drawn = FALSE;
186 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
188 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
191 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
193 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
194 *rv = vvp->background_color;
198 /* returns pointer to internal static storage, changes next time function called, use quickly */
199 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
201 static gchar color[8];
202 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));
206 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
208 g_assert ( vvp && vvp->background_gc );
209 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
210 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
212 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
215 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
217 g_assert ( vvp && vvp->background_gc );
218 vvp->background_color = *color;
219 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
222 GdkColor *vik_viewport_get_highlight_gdkcolor ( VikViewport *vvp )
224 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
225 *rv = vvp->highlight_color;
229 /* returns pointer to internal static storage, changes next time function called, use quickly */
230 const gchar *vik_viewport_get_highlight_color ( VikViewport *vvp )
232 static gchar color[8];
233 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));
237 void vik_viewport_set_highlight_color ( VikViewport *vvp, const gchar *colorname )
239 g_assert ( vvp->highlight_gc );
240 gdk_color_parse ( colorname, &(vvp->highlight_color) );
241 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, &(vvp->highlight_color) );
244 void vik_viewport_set_highlight_gdkcolor ( VikViewport *vvp, GdkColor *color )
246 g_assert ( vvp->highlight_gc );
247 vvp->highlight_color = *color;
248 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, color );
251 GdkGC *vik_viewport_get_gc_highlight ( VikViewport *vvp )
253 return vvp->highlight_gc;
256 void vik_viewport_set_highlight_thickness ( VikViewport *vvp, gint thickness )
258 // Otherwise same GDK_* attributes as in vik_viewport_new_gc
259 gdk_gc_set_line_attributes ( vvp->highlight_gc, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
262 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
267 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
268 if ( gdk_color_parse ( colorname, &color ) )
269 gdk_gc_set_rgb_fg_color ( rv, &color );
271 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
272 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
276 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
280 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
281 gdk_gc_set_rgb_fg_color ( rv, color );
282 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
286 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
289 vvp->height = height;
290 if ( vvp->scr_buffer )
291 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
292 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
294 /* TODO trigger: only if this is enabled !!! */
295 if ( vvp->snapshot_buffer )
296 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
297 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
301 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
303 return vvp->scr_buffer;
306 gboolean vik_viewport_configure ( VikViewport *vvp )
308 g_return_val_if_fail ( vvp != NULL, TRUE );
310 vvp->width = GTK_WIDGET(vvp)->allocation.width;
311 vvp->height = GTK_WIDGET(vvp)->allocation.height;
313 if ( vvp->scr_buffer )
314 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
316 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
318 /* TODO trigger: only if enabled! */
319 if ( vvp->snapshot_buffer )
320 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
322 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
325 /* this is down here so it can get a GC (necessary?) */
326 if ( !vvp->background_gc )
328 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
329 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
331 if ( ! vvp->highlight_gc )
333 vvp->highlight_gc = vik_viewport_new_gc ( vvp, DEFAULT_HIGHLIGHT_COLOR, 1 );
334 vik_viewport_set_highlight_color ( vvp, DEFAULT_HIGHLIGHT_COLOR );
336 if ( !vvp->scale_bg_gc) {
337 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
343 static void viewport_finalize ( GObject *gob )
345 VikViewport *vvp = VIK_VIEWPORT(gob);
347 g_return_if_fail ( vvp != NULL );
349 if ( vvp->scr_buffer )
350 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
352 if ( vvp->snapshot_buffer )
353 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
355 if ( vvp->alpha_pixbuf )
356 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
358 if ( vvp->background_gc )
359 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
361 if ( vvp->highlight_gc )
362 g_object_unref ( G_OBJECT ( vvp->highlight_gc ) );
364 if ( vvp->scale_bg_gc ) {
365 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
366 vvp->scale_bg_gc = NULL;
369 G_OBJECT_CLASS(parent_class)->finalize(gob);
373 * vik_viewport_clear:
376 * Clear the whole viewport.
378 void vik_viewport_clear ( VikViewport *vvp )
380 g_return_if_fail ( vvp != NULL );
381 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
382 vik_viewport_reset_copyrights ( vvp );
383 vik_viewport_reset_logos ( vvp );
387 * vik_viewport_set_draw_scale:
389 * @draw_scale: new value
391 * Enable/Disable display of scale.
393 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
395 vvp->draw_scale = draw_scale;
398 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
400 return vvp->draw_scale;
403 void vik_viewport_draw_scale ( VikViewport *vvp )
405 g_return_if_fail ( vvp != NULL );
407 if ( vvp->draw_scale ) {
408 VikCoord left, right;
409 gdouble unit, base, diff, old_unit, old_diff, ratio;
410 gint odd, len, SCSIZE = 5, HEIGHT=10;
414 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
415 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
417 vik_units_distance_t dist_units = a_vik_get_units_distance ();
418 switch (dist_units) {
419 case VIK_UNITS_DISTANCE_KILOMETRES:
420 base = vik_coord_diff ( &left, &right ); // in meters
422 case VIK_UNITS_DISTANCE_MILES:
423 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
424 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
427 base = 1; // Keep the compiler happy
428 g_critical("Houston, we've had a problem. distance=%d", dist_units);
430 ratio = (vvp->width/SCSIZE)/base;
433 diff = fabs(base-unit);
437 while (diff <= old_diff) {
440 unit = unit * (odd%2 ? 5 : 2);
441 diff = fabs(base-unit);
447 /* white background */
448 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
449 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
450 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
451 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
452 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
453 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
455 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
456 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
457 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
458 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
459 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
460 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
463 for (i=1; i<5; i++) {
464 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
465 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
466 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
467 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
471 for (i=1; i<10; i++) {
472 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
473 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
474 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
475 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
478 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
479 pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
481 switch (dist_units) {
482 case VIK_UNITS_DISTANCE_KILOMETRES:
484 sprintf(s, "%d km", (int)unit/1000);
486 sprintf(s, "%d m", (int)unit);
489 case VIK_UNITS_DISTANCE_MILES:
490 // Handle units in 0.1 miles
492 sprintf(s, "%0.1f miles", unit/10.0);
494 else if ((int)unit == 10.0) {
495 sprintf(s, "1 mile");
498 sprintf(s, "%d miles", (int)(unit/10.0));
502 g_critical("Houston, we've had a problem. distance=%d", dist_units);
504 pango_layout_set_text(pl, s, -1);
505 vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
506 PAD + len + PAD, vvp->height - PAD - 10, pl);
512 void vik_viewport_draw_copyright ( VikViewport *vvp )
514 g_return_if_fail ( vvp != NULL );
517 PangoRectangle ink_rect, logical_rect;
520 /* compute copyrights string */
521 guint len = g_slist_length ( vvp->copyrights );
524 for (i = 0 ; i < len ; i++)
526 // Stop when buffer is full
527 int slen = strlen ( s );
531 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
533 // Only use part of this copyright that fits in the available space left
534 // remembering 1 character is left available for the appended space
535 int clen = strlen ( copyright );
536 if ( slen + clen > 126 ) {
540 strncat ( s, copyright, clen );
544 /* create pango layout */
545 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
546 pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
547 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
550 pango_layout_set_text(pl, s, -1);
552 /* Use maximum of half the viewport width */
553 pango_layout_set_width ( pl, ( vvp->width / 2 ) * PANGO_SCALE );
554 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
555 vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
556 vvp->width / 2, vvp->height - logical_rect.height, pl);
564 * vik_viewport_set_draw_centermark:
566 * @draw_centermark: new value
568 * Enable/Disable display of center mark.
570 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
572 vvp->draw_centermark = draw_centermark;
575 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
577 return vvp->draw_centermark;
580 void vik_viewport_draw_centermark ( VikViewport *vvp )
582 g_return_if_fail ( vvp != NULL );
584 if ( !vvp->draw_centermark )
589 int center_x = vvp->width/2;
590 int center_y = vvp->height/2;
591 GdkGC * black_gc = gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc;
593 /* white back ground */
594 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
595 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
596 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
597 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
598 /* black fore ground */
599 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
600 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
601 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
602 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
606 void vik_viewport_draw_logo ( VikViewport *vvp )
608 g_return_if_fail ( vvp != NULL );
610 guint len = g_slist_length ( vvp->logos );
611 gint x = vvp->width - PAD;
614 for (i = 0 ; i < len ; i++)
616 GdkPixbuf *logo = g_slist_nth_data ( vvp->logos, i );
617 gint width = gdk_pixbuf_get_width ( logo );
618 gint height = gdk_pixbuf_get_height ( logo );
619 vik_viewport_draw_pixbuf ( vvp, logo, 0, 0, x - width, y, width, height );
624 void vik_viewport_set_draw_highlight ( VikViewport *vvp, gboolean draw_highlight )
626 vvp->draw_highlight = draw_highlight;
629 gboolean vik_viewport_get_draw_highlight ( VikViewport *vvp )
631 return vvp->draw_highlight;
634 void vik_viewport_sync ( VikViewport *vvp )
636 g_return_if_fail ( vvp != NULL );
637 gdk_draw_drawable(GTK_WIDGET(vvp)->window, gtk_widget_get_style(GTK_WIDGET(vvp))->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, 0, 0, vvp->width, vvp->height);
640 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
644 g_return_if_fail ( vvp != NULL );
645 gdk_draw_drawable(GTK_WIDGET(vvp)->window, gtk_widget_get_style(GTK_WIDGET(vvp))->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, x_off, y_off, vvp->width, vvp->height);
651 x = vvp->width+x_off;
658 y = vvp->height+y_off;
661 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
662 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
665 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
667 g_return_if_fail ( vvp != NULL );
668 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
669 vvp->xmpp = vvp->ympp = xympp;
671 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
672 viewport_utm_zone_check(vvp);
675 /* or could do factor */
676 void vik_viewport_zoom_in ( VikViewport *vvp )
678 g_return_if_fail ( vvp != NULL );
679 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
684 viewport_utm_zone_check(vvp);
688 void vik_viewport_zoom_out ( VikViewport *vvp )
690 g_return_if_fail ( vvp != NULL );
691 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
696 viewport_utm_zone_check(vvp);
700 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
702 if ( vvp->xmpp == vvp->ympp )
707 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
712 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
717 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
719 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
721 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
722 viewport_utm_zone_check(vvp);
726 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
728 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
730 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
731 viewport_utm_zone_check(vvp);
736 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
738 g_return_val_if_fail ( vvp != NULL, NULL );
739 return &(vvp->center);
742 /* called every time we update coordinates/zoom */
743 static void viewport_utm_zone_check ( VikViewport *vvp )
745 if ( vvp->coord_mode == VIK_COORD_UTM )
749 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
750 a_coords_latlon_to_utm ( &ll, &utm );
751 if ( utm.zone != vvp->center.utm_zone )
752 *((struct UTM *)(&vvp->center)) = utm;
754 /* misc. stuff so we don't have to check later */
755 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
756 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
760 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
762 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
763 if ( vvp->coord_mode == VIK_COORD_UTM )
764 viewport_utm_zone_check ( vvp );
767 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
769 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
770 if ( vvp->coord_mode == VIK_COORD_UTM )
771 viewport_utm_zone_check ( vvp );
774 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
776 vvp->center = *coord;
777 if ( vvp->coord_mode == VIK_COORD_UTM )
778 viewport_utm_zone_check ( vvp );
781 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
783 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
785 /* get center, then just offset */
786 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
787 ul->mode = VIK_COORD_UTM;
790 ul->north_south += (vvp->ympp * vvp->height / 2);
791 ul->east_west -= (vvp->xmpp * vvp->width / 2);
792 br->north_south -= (vvp->ympp * vvp->height / 2);
793 br->east_west += (vvp->xmpp * vvp->width / 2);
796 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
798 if ( vvp->coord_mode == VIK_COORD_UTM ) {
799 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
800 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
805 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
807 if ( vvp->coord_mode == VIK_COORD_UTM ) {
809 g_assert ( vvp != NULL );
810 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
811 return coord.utm_zone;
816 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
818 if ( vvp->coord_mode == VIK_COORD_UTM ) {
820 g_assert ( vvp != NULL );
821 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
822 return coord.utm_zone;
828 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
830 g_return_if_fail ( vvp != NULL );
831 if ( vvp->coord_mode == VIK_COORD_UTM ) {
832 /* slightly optimized */
833 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
834 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
835 viewport_utm_zone_check ( vvp );
838 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
839 vik_viewport_set_center_coord ( vvp, &tmp );
843 gint vik_viewport_get_width( VikViewport *vvp )
845 g_return_val_if_fail ( vvp != NULL, 0 );
849 gint vik_viewport_get_height( VikViewport *vvp )
851 g_return_val_if_fail ( vvp != NULL, 0 );
855 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
857 g_return_if_fail ( vvp != NULL );
859 if ( vvp->coord_mode == VIK_COORD_UTM ) {
861 struct UTM *utm = (struct UTM *) coord;
862 coord->mode = VIK_COORD_UTM;
864 utm->zone = vvp->center.utm_zone;
865 utm->letter = vvp->center.utm_letter;
866 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
867 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
868 utm->zone += zone_delta;
869 utm->easting -= zone_delta * vvp->utm_zone_width;
870 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
871 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
872 coord->mode = VIK_COORD_LATLON;
873 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
874 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
875 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
876 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
877 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);
878 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
880 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
881 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
884 --> THIS IS JUNK HERE.
885 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
887 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
888 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
894 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
897 g_return_if_fail ( vvp != NULL );
899 if ( coord->mode != vvp->coord_mode )
901 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
902 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
906 if ( vvp->coord_mode == VIK_COORD_UTM ) {
907 struct UTM *center = (struct UTM *) &(vvp->center);
908 struct UTM *utm = (struct UTM *) coord;
909 if ( center->zone != utm->zone && vvp->one_utm_zone )
911 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
915 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
916 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
917 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
918 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
919 struct LatLon *center = (struct LatLon *) &(vvp->center);
920 struct LatLon *ll = (struct LatLon *) coord;
922 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
923 /* FIXMERCATOR: Optimize */
924 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
925 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
926 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
927 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 );
929 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
930 /* FIXMERCATOR: Optimize */
931 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
932 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
937 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
939 if ( *x1 > 20000 || *x1 < -20000 ) {
940 gdouble shrinkfactor = ABS(20000.0 / *x1);
941 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
942 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
943 } else if ( *y1 > 20000 || *y1 < -20000 ) {
944 gdouble shrinkfactor = ABS(20000.0 / *x1);
945 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
946 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
947 } else if ( *x2 > 20000 || *x2 < -20000 ) {
948 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
949 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
950 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
951 } else if ( *y2 > 20000 || *y2 < -20000 ) {
952 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
953 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
954 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
958 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
960 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
961 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
962 /*** clipping, yeah! ***/
963 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
964 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
968 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
970 // Using 32 as half the default waypoint image size, so this draws ensures the highlight gets done
971 if ( x1 > -32 && x1 < vvp->width + 32 && y1 > -32 && y1 < vvp->height + 32 )
972 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
975 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
977 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
978 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
981 /* shouldn't use this -- slow -- change the alpha channel instead. */
982 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
983 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
985 gint real_dest_x = MAX(dest_x,0);
986 gint real_dest_y = MAX(dest_y,0);
989 return; /* don't waste your time */
991 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
993 if ( vvp->alpha_pixbuf )
994 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
995 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
996 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
997 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
1000 w = MIN(w,vvp->width - dest_x);
1001 h = MIN(h,vvp->height - dest_y);
1003 /* check that we are drawing within boundaries. */
1004 src_x += (real_dest_x - dest_x);
1005 src_y += (real_dest_y - dest_y);
1006 w -= (real_dest_x - dest_x);
1007 h -= (real_dest_y - dest_y);
1009 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
1010 real_dest_x, real_dest_y, 0, 0, w, h );
1012 /* do a composite */
1013 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
1015 /* draw pixbuf_tmp */
1016 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
1019 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
1020 gint dest_x, gint dest_y, gint w, gint h )
1022 gdk_draw_pixbuf ( vvp->scr_buffer,
1025 src_x, src_y, dest_x, dest_y, w, h,
1026 GDK_RGB_DITHER_NONE, 0, 0 );
1029 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
1031 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
1035 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
1037 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
1040 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
1043 return vvp->coord_mode;
1046 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
1048 g_return_if_fail ( vvp != NULL );
1049 vvp->coord_mode = mode;
1050 vik_coord_convert ( &(vvp->center), mode );
1053 /* Thanks GPSDrive */
1054 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 )
1057 gdouble dif, lat, lon;
1058 double Ra = Radius[90+(gint)zero_lat];
1060 px = (mapSizeX2 - x) * pixelfact_x;
1061 py = (-mapSizeY2 + y) * pixelfact_y;
1063 lat = zero_lat - py / Ra;
1064 lat = zero_lat - py / Ra;
1068 cos (DEG2RAD(lat)));
1070 dif = lat * (1 - (cos (DEG2RAD(fabs (lon - zero_long)))));
1071 lat = lat - dif / 1.5;
1075 cos (DEG2RAD(lat)));
1082 /* Thanks GPSDrive */
1083 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 )
1087 gint mapSizeX = 2 * mapSizeX2;
1088 gint mapSizeY = 2 * mapSizeY2;
1090 g_assert ( lt >= -90.0 && lt <= 90.0 );
1091 // lg *= rad2deg; // FIXME, optimize equations
1093 Ra = Radius[90+(gint)lt];
1095 cos (DEG2RAD(lt)) * (lg - zero_long);
1096 *y = Ra * (lt - zero_lat);
1097 dif = Ra * RAD2DEG(1 - (cos ((DEG2RAD(lg - zero_long)))));
1098 *y = *y + dif / 1.85;
1099 *x = *x / pixelfact_x;
1100 *y = *y / pixelfact_y;
1101 *x = mapSizeX2 - *x;
1103 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1108 static void viewport_init_ra()
1110 static gboolean done_before = FALSE;
1114 for ( i = -90; i <= 90; i++)
1115 Radius[i+90] = calcR ( DEG2RAD((double)i) );
1120 double calcR (double lat)
1122 double a = 6378.137, r, sc, x, y, z;
1123 double e2 = 0.081082 * 0.081082;
1125 * the radius of curvature of an ellipsoidal Earth in the plane of the
1126 * meridian is given by
1128 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1131 * where a is the equatorial radius, b is the polar radius, and e is
1132 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1134 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1135 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1136 * = 0.081082 Eccentricity
1142 z = 1.0 - e2 * sc * sc;
1149 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1151 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1154 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1156 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1157 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1160 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1162 static GdkGCValues values;
1163 gdk_gc_get_values ( gc, &values );
1164 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1167 GdkFunction vik_gc_get_function ( GdkGC *gc )
1169 static GdkGCValues values;
1170 gdk_gc_get_values ( gc, &values );
1171 return values.function;
1174 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1176 vvp->drawmode = drawmode;
1177 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1178 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1180 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1184 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1186 return vvp->drawmode;
1189 /******** triggering *******/
1190 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1192 vp->trigger = trigger;
1195 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1200 void vik_viewport_snapshot_save ( VikViewport *vp )
1202 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1205 void vik_viewport_snapshot_load ( VikViewport *vp )
1207 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1210 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1212 vp->half_drawn = half_drawn;
1215 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1217 return vp->half_drawn;
1221 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1223 const gchar *name = NULL;
1224 VikWindow *vw = NULL;
1225 GtkWidget *mode_button;
1228 vw = VIK_WINDOW_FROM_WIDGET(vv);
1229 mode_button = vik_window_get_drawmode_button(vw, mode);
1230 label = gtk_bin_get_child(GTK_BIN(mode_button));
1232 name = gtk_label_get_text ( GTK_LABEL(label) );
1238 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1240 VikCoord tleft, tright, bleft, bright;
1242 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1243 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1244 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1245 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1247 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1248 vik_coord_convert(&tright, VIK_COORD_LATLON);
1249 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1250 vik_coord_convert(&bright, VIK_COORD_LATLON);
1252 *max_lat = MAX(tleft.north_south, tright.north_south);
1253 *min_lat = MIN(bleft.north_south, bright.north_south);
1254 *max_lon = MAX(tright.east_west, bright.east_west);
1255 *min_lon = MIN(tleft.east_west, bleft.east_west);
1258 void vik_viewport_reset_copyrights ( VikViewport *vp )
1260 g_return_if_fail ( vp != NULL );
1261 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1262 g_slist_free ( vp->copyrights );
1263 vp->copyrights = NULL;
1267 * vik_viewport_add_copyright:
1269 * @copyright: new copyright to display
1271 * Add a copyright to display on viewport.
1273 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1275 g_return_if_fail ( vp != NULL );
1278 GSList *found = g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1279 if ( found == NULL )
1281 gchar *duple = g_strdup ( copyright );
1282 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );
1287 void vik_viewport_reset_logos ( VikViewport *vp )
1289 g_return_if_fail ( vp != NULL );
1290 /* do not free elem */
1291 g_slist_free ( vp->logos );
1295 void vik_viewport_add_logo ( VikViewport *vp, const GdkPixbuf *logo )
1297 g_return_if_fail ( vp != NULL );
1300 GdkPixbuf *found = NULL; /* FIXME (GdkPixbuf*)g_slist_find_custom ( vp->logos, logo, (GCompareFunc)== ); */
1301 if ( found == NULL )
1303 vp->logos = g_slist_prepend ( vp->logos, (gpointer)logo );
1309 * vik_viewport_compute_bearing:
1315 * @angle: bearing in Radian (output)
1316 * @baseangle: UTM base angle in Radian (output)
1320 void vik_viewport_compute_bearing ( VikViewport *vp, gint x1, gint y1, gint x2, gint y2, gdouble *angle, gdouble *baseangle )
1322 gdouble len = sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2));
1323 gdouble dx = (x2-x1)/len*10;
1324 gdouble dy = (y2-y1)/len*10;
1326 *angle = atan2(dy, dx) + M_PI_2;
1328 if ( vik_viewport_get_drawmode ( vp ) == VIK_VIEWPORT_DRAWMODE_UTM) {
1334 vik_viewport_screen_to_coord ( vp, x1, y1, &test );
1335 vik_coord_to_latlon ( &test, &ll );
1336 ll.lat += vik_viewport_get_ympp ( vp ) * vik_viewport_get_height ( vp ) / 11000.0; // about 11km per degree latitude
1337 a_coords_latlon_to_utm ( &ll, &u );
1338 vik_coord_load_from_utm ( &test, VIK_VIEWPORT_DRAWMODE_UTM, &u );
1339 vik_viewport_coord_to_screen ( vp, &test, &tx, &ty );
1341 *baseangle = M_PI - atan2(tx-x1, ty-y1);
1342 *angle -= *baseangle;
1347 if (*angle > 2*M_PI)