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"
42 #include "vikwindow.h"
43 #include "vikviewport.h"
50 static gdouble EASTING_OFFSET = 500000.0;
54 static void viewport_class_init ( VikViewportClass *klass );
55 static void viewport_init ( VikViewport *vvp );
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 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
97 VikViewportDrawMode drawmode;
99 /* handy conversion factors which make google plotting extremely fast */
100 gdouble google_calcx_fact;
101 gdouble google_calcy_fact;
102 gdouble google_calcx_rev_fact;
103 gdouble google_calcy_rev_fact;
107 GdkPixmap *snapshot_buffer;
112 viewport_utm_zone_width ( VikViewport *vvp )
114 if ( vvp->coord_mode == VIK_COORD_UTM ) {
117 /* get latitude of screen bottom */
118 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
119 utm.northing -= vvp -> height * vvp -> ympp / 2;
120 a_coords_utm_to_latlon ( &utm, &ll );
123 ll.lon = (utm.zone - 1) * 6 - 180 ;
124 a_coords_latlon_to_utm ( &ll, &utm);
125 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
131 GType vik_viewport_get_type (void)
133 static GType vvp_type = 0;
137 static const GTypeInfo vvp_info =
139 sizeof (VikViewportClass),
140 NULL, /* base_init */
141 NULL, /* base_finalize */
142 (GClassInitFunc) viewport_class_init,
143 NULL, /* class_finalize */
144 NULL, /* class_data */
145 sizeof (VikViewport),
147 (GInstanceInitFunc) viewport_init,
149 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
154 static void viewport_class_init ( VikViewportClass *klass )
157 GObjectClass *object_class;
159 object_class = G_OBJECT_CLASS (klass);
161 object_class->finalize = viewport_finalize;
163 parent_class = g_type_class_peek_parent (klass);
166 VikViewport *vik_viewport_new ()
168 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
172 static void viewport_init ( VikViewport *vvp )
178 ll.lat = a_vik_get_default_lat();
179 ll.lon = a_vik_get_default_long();
180 a_coords_latlon_to_utm ( &ll, &utm );
182 /* TODO: not static */
185 vvp->coord_mode = VIK_COORD_LATLON;
186 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
187 vvp->center.mode = VIK_COORD_LATLON;
188 vvp->center.north_south = ll.lat;
189 vvp->center.east_west = ll.lon;
190 vvp->center.utm_zone = (int)utm.zone;
191 vvp->center.utm_letter = utm.letter;
192 vvp->scr_buffer = NULL;
193 vvp->alpha_pixbuf = NULL;
194 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
195 vvp->utm_zone_width = 0.0;
196 vvp->background_gc = NULL;
197 vvp->scale_bg_gc = NULL;
199 vvp->copyrights = NULL;
201 vvp->draw_scale = TRUE;
202 vvp->draw_centermark = TRUE;
203 vvp->draw_highlight = TRUE;
206 vvp->snapshot_buffer = NULL;
207 vvp->half_drawn = FALSE;
209 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
211 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
214 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
216 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
217 *rv = vvp->background_color;
221 /* returns pointer to internal static storage, changes next time function called, use quickly */
222 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
224 static gchar color[8];
225 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));
229 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
231 g_assert ( vvp && vvp->background_gc );
232 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
233 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
235 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
238 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
240 g_assert ( vvp && vvp->background_gc );
241 vvp->background_color = *color;
242 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
246 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
251 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
252 if ( gdk_color_parse ( colorname, &color ) )
253 gdk_gc_set_rgb_fg_color ( rv, &color );
255 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
256 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
260 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
264 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
265 gdk_gc_set_rgb_fg_color ( rv, color );
266 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
270 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
273 vvp->height = height;
274 if ( vvp->scr_buffer )
275 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
276 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
278 /* TODO trigger: only if this is enabled !!! */
279 if ( vvp->snapshot_buffer )
280 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
281 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
285 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
287 return vvp->scr_buffer;
290 gboolean vik_viewport_configure ( VikViewport *vvp )
292 g_return_val_if_fail ( vvp != NULL, TRUE );
294 vvp->width = GTK_WIDGET(vvp)->allocation.width;
295 vvp->height = GTK_WIDGET(vvp)->allocation.height;
297 if ( vvp->scr_buffer )
298 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
300 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
302 /* TODO trigger: only if enabled! */
303 if ( vvp->snapshot_buffer )
304 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
306 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
309 /* this is down here so it can get a GC (necessary?) */
310 if ( !vvp->background_gc )
312 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
313 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
315 if ( !vvp->scale_bg_gc) {
316 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
322 static void viewport_finalize ( GObject *gob )
324 VikViewport *vvp = VIK_VIEWPORT(gob);
326 g_return_if_fail ( vvp != NULL );
328 if ( vvp->scr_buffer )
329 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
331 if ( vvp->snapshot_buffer )
332 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
334 if ( vvp->alpha_pixbuf )
335 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
337 if ( vvp->background_gc )
338 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
340 if ( vvp->scale_bg_gc ) {
341 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
342 vvp->scale_bg_gc = NULL;
345 G_OBJECT_CLASS(parent_class)->finalize(gob);
349 * vik_viewport_clear:
352 * Clear the whole viewport.
354 void vik_viewport_clear ( VikViewport *vvp )
356 g_return_if_fail ( vvp != NULL );
357 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
358 vik_viewport_reset_copyrights ( vvp );
359 vik_viewport_reset_logos ( vvp );
363 * vik_viewport_set_draw_scale:
365 * @draw_scale: new value
367 * Enable/Disable display of scale.
369 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
371 vvp->draw_scale = draw_scale;
374 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
376 return vvp->draw_scale;
379 void vik_viewport_draw_scale ( VikViewport *vvp )
381 g_return_if_fail ( vvp != NULL );
383 if ( vvp->draw_scale ) {
384 VikCoord left, right;
385 gdouble unit, base, diff, old_unit, old_diff, ratio;
386 gint odd, len, SCSIZE = 5, HEIGHT=10;
387 PangoFontDescription *pfd;
391 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
392 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
394 vik_units_distance_t dist_units = a_vik_get_units_distance ();
395 switch (dist_units) {
396 case VIK_UNITS_DISTANCE_KILOMETRES:
397 base = vik_coord_diff ( &left, &right ); // in meters
399 case VIK_UNITS_DISTANCE_MILES:
400 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
401 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
404 base = 1; // Keep the compiler happy
405 g_critical("Houston, we've had a problem. distance=%d", dist_units);
407 ratio = (vvp->width/SCSIZE)/base;
410 diff = fabs(base-unit);
414 while (diff <= old_diff) {
417 unit = unit * (odd%2 ? 5 : 2);
418 diff = fabs(base-unit);
424 /* white background */
425 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
426 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
427 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
428 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
429 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
430 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
432 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
433 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
434 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
435 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
436 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
437 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
440 for (i=1; i<5; i++) {
441 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
442 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
443 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
444 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
448 for (i=1; i<10; i++) {
449 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
450 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
451 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
452 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
455 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
456 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
457 pango_layout_set_font_description (pl, pfd);
458 pango_font_description_free (pfd);
460 switch (dist_units) {
461 case VIK_UNITS_DISTANCE_KILOMETRES:
463 sprintf(s, "%d km", (int)unit/1000);
465 sprintf(s, "%d m", (int)unit);
468 case VIK_UNITS_DISTANCE_MILES:
469 // Handle units in 0.1 miles
471 sprintf(s, "%0.1f miles", unit/10.0);
473 else if ((int)unit == 10.0) {
474 sprintf(s, "1 mile");
477 sprintf(s, "%d miles", (int)(unit/10.0));
481 g_critical("Houston, we've had a problem. distance=%d", dist_units);
483 pango_layout_set_text(pl, s, -1);
484 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
485 PAD + len + PAD, vvp->height - PAD - 10, pl);
491 void vik_viewport_draw_copyright ( VikViewport *vvp )
493 g_return_if_fail ( vvp != NULL );
495 PangoFontDescription *pfd;
497 PangoRectangle ink_rect, logical_rect;
500 /* compute copyrights string */
501 guint len = g_slist_length ( vvp->copyrights );
503 for (i = 0 ; i < len ; i++)
505 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
506 strcat ( s, copyright );
510 /* create pango layout */
511 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
512 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
513 pango_layout_set_font_description (pl, pfd);
514 pango_font_description_free (pfd);
516 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
519 pango_layout_set_text(pl, s, -1);
521 /* Use maximum of half the viewport width */
522 pango_layout_set_width ( pl, ( vvp->width / 2 - PAD ) * PANGO_SCALE );
523 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
524 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
525 vvp->width / 2, vvp->height - PAD - logical_rect.height, pl);
533 * vik_viewport_set_draw_centermark:
535 * @draw_centermark: new value
537 * Enable/Disable display of center mark.
539 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
541 vvp->draw_centermark = draw_centermark;
544 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
546 return vvp->draw_centermark;
549 void vik_viewport_draw_centermark ( VikViewport *vvp )
551 g_return_if_fail ( vvp != NULL );
553 if ( !vvp->draw_centermark )
558 int center_x = vvp->width/2;
559 int center_y = vvp->height/2;
560 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
562 /* white back ground */
563 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
564 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
565 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
566 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
567 /* black fore ground */
568 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
569 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
570 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
571 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
575 void vik_viewport_draw_logo ( VikViewport *vvp )
577 g_return_if_fail ( vvp != NULL );
579 /* compute copyrights string */
580 guint len = g_slist_length ( vvp->logos );
581 gint x = vvp->width - PAD;
584 for (i = 0 ; i < len ; i++)
586 GdkPixbuf *logo = g_slist_nth_data ( vvp->logos, i );
587 gint width = gdk_pixbuf_get_width ( logo );
588 gint height = gdk_pixbuf_get_height ( logo );
589 vik_viewport_draw_pixbuf ( vvp, logo, 0, 0, x - width, y, width, height );
594 void vik_viewport_set_draw_highlight ( VikViewport *vvp, gboolean draw_highlight )
596 vvp->draw_highlight = draw_highlight;
599 gboolean vik_viewport_get_draw_highlight ( VikViewport *vvp )
601 return vvp->draw_highlight;
604 void vik_viewport_sync ( VikViewport *vvp )
606 g_return_if_fail ( vvp != NULL );
607 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);
610 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
614 g_return_if_fail ( vvp != NULL );
615 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);
621 x = vvp->width+x_off;
628 y = vvp->height+y_off;
631 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
632 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
635 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
637 g_return_if_fail ( vvp != NULL );
638 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
639 vvp->xmpp = vvp->ympp = xympp;
641 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
642 viewport_utm_zone_check(vvp);
645 /* or could do factor */
646 void vik_viewport_zoom_in ( VikViewport *vvp )
648 g_return_if_fail ( vvp != NULL );
649 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
654 viewport_utm_zone_check(vvp);
658 void vik_viewport_zoom_out ( VikViewport *vvp )
660 g_return_if_fail ( vvp != NULL );
661 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
666 viewport_utm_zone_check(vvp);
670 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
672 if ( vvp->xmpp == vvp->ympp )
677 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
682 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
687 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
689 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
691 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
692 viewport_utm_zone_check(vvp);
696 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
698 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
700 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
701 viewport_utm_zone_check(vvp);
706 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
708 g_return_val_if_fail ( vvp != NULL, NULL );
709 return &(vvp->center);
712 /* called every time we update coordinates/zoom */
713 static void viewport_utm_zone_check ( VikViewport *vvp )
715 if ( vvp->coord_mode == VIK_COORD_UTM )
719 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
720 a_coords_latlon_to_utm ( &ll, &utm );
721 if ( utm.zone != vvp->center.utm_zone )
722 *((struct UTM *)(&vvp->center)) = utm;
724 /* misc. stuff so we don't have to check later */
725 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
726 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
730 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
732 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
733 if ( vvp->coord_mode == VIK_COORD_UTM )
734 viewport_utm_zone_check ( vvp );
737 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
739 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
740 if ( vvp->coord_mode == VIK_COORD_UTM )
741 viewport_utm_zone_check ( vvp );
744 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
746 vvp->center = *coord;
747 if ( vvp->coord_mode == VIK_COORD_UTM )
748 viewport_utm_zone_check ( vvp );
751 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
753 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
755 /* get center, then just offset */
756 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
757 ul->mode = VIK_COORD_UTM;
760 ul->north_south += (vvp->ympp * vvp->height / 2);
761 ul->east_west -= (vvp->xmpp * vvp->width / 2);
762 br->north_south -= (vvp->ympp * vvp->height / 2);
763 br->east_west += (vvp->xmpp * vvp->width / 2);
766 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
768 if ( vvp->coord_mode == VIK_COORD_UTM ) {
769 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
770 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
775 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
777 if ( vvp->coord_mode == VIK_COORD_UTM ) {
779 g_assert ( vvp != NULL );
780 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
781 return coord.utm_zone;
786 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
788 if ( vvp->coord_mode == VIK_COORD_UTM ) {
790 g_assert ( vvp != NULL );
791 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
792 return coord.utm_zone;
798 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
800 g_return_if_fail ( vvp != NULL );
801 if ( vvp->coord_mode == VIK_COORD_UTM ) {
802 /* slightly optimized */
803 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
804 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
805 viewport_utm_zone_check ( vvp );
808 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
809 vik_viewport_set_center_coord ( vvp, &tmp );
813 gint vik_viewport_get_width( VikViewport *vvp )
815 g_return_val_if_fail ( vvp != NULL, 0 );
819 gint vik_viewport_get_height( VikViewport *vvp )
821 g_return_val_if_fail ( vvp != NULL, 0 );
825 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
827 g_return_if_fail ( vvp != NULL );
829 if ( vvp->coord_mode == VIK_COORD_UTM ) {
831 struct UTM *utm = (struct UTM *) coord;
832 coord->mode = VIK_COORD_UTM;
834 utm->zone = vvp->center.utm_zone;
835 utm->letter = vvp->center.utm_letter;
836 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
837 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
838 utm->zone += zone_delta;
839 utm->easting -= zone_delta * vvp->utm_zone_width;
840 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
841 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
842 coord->mode = VIK_COORD_LATLON;
843 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
844 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
845 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
846 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
847 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);
848 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
850 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
851 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
854 --> THIS IS JUNK HERE.
855 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
857 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
858 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
864 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
867 g_return_if_fail ( vvp != NULL );
869 if ( coord->mode != vvp->coord_mode )
871 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
872 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
876 if ( vvp->coord_mode == VIK_COORD_UTM ) {
877 struct UTM *center = (struct UTM *) &(vvp->center);
878 struct UTM *utm = (struct UTM *) coord;
879 if ( center->zone != utm->zone && vvp->one_utm_zone )
881 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
885 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
886 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
887 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
888 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
889 struct LatLon *center = (struct LatLon *) &(vvp->center);
890 struct LatLon *ll = (struct LatLon *) coord;
892 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
893 /* FIXMERCATOR: Optimize */
894 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
895 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
896 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
897 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 );
899 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
900 /* FIXMERCATOR: Optimize */
901 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
902 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
907 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
909 if ( *x1 > 20000 || *x1 < -20000 ) {
910 gdouble shrinkfactor = ABS(20000.0 / *x1);
911 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
912 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
913 } else if ( *y1 > 20000 || *y1 < -20000 ) {
914 gdouble shrinkfactor = ABS(20000.0 / *x1);
915 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
916 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
917 } else if ( *x2 > 20000 || *x2 < -20000 ) {
918 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
919 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
920 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
921 } else if ( *y2 > 20000 || *y2 < -20000 ) {
922 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
923 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
924 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
928 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
930 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
931 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
932 /*** clipping, yeah! ***/
933 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
934 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
938 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
940 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
941 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
944 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
946 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
947 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
950 /* shouldn't use this -- slow -- change the alpha channel instead. */
951 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
952 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
954 gint real_dest_x = MAX(dest_x,0);
955 gint real_dest_y = MAX(dest_y,0);
958 return; /* don't waste your time */
960 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
962 if ( vvp->alpha_pixbuf )
963 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
964 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
965 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
966 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
969 w = MIN(w,vvp->width - dest_x);
970 h = MIN(h,vvp->height - dest_y);
972 /* check that we are drawing within boundaries. */
973 src_x += (real_dest_x - dest_x);
974 src_y += (real_dest_y - dest_y);
975 w -= (real_dest_x - dest_x);
976 h -= (real_dest_y - dest_y);
978 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
979 real_dest_x, real_dest_y, 0, 0, w, h );
982 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
984 /* draw pixbuf_tmp */
985 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
988 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
989 gint dest_x, gint dest_y, gint w, gint h )
991 gdk_draw_pixbuf ( vvp->scr_buffer,
992 // GTK_WIDGET(vvp)->style->black_gc,
995 src_x, src_y, dest_x, dest_y, w, h,
996 GDK_RGB_DITHER_NONE, 0, 0 );
999 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
1001 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
1005 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
1007 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
1010 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
1013 return vvp->coord_mode;
1016 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
1018 g_return_if_fail ( vvp != NULL );
1019 vvp->coord_mode = mode;
1020 vik_coord_convert ( &(vvp->center), mode );
1023 /* Thanks GPSDrive */
1024 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 )
1027 gdouble dif, lat, lon;
1028 double Ra = Radius[90+(gint)zero_lat];
1030 px = (mapSizeX2 - x) * pixelfact_x;
1031 py = (-mapSizeY2 + y) * pixelfact_y;
1033 lat = zero_lat - py / Ra;
1034 lat = zero_lat - py / Ra;
1038 cos (lat * DEG2RAD));
1040 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
1041 lat = lat - dif / 1.5;
1045 cos (lat * DEG2RAD));
1052 /* Thanks GPSDrive */
1053 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 )
1057 gint mapSizeX = 2 * mapSizeX2;
1058 gint mapSizeY = 2 * mapSizeY2;
1060 g_assert ( lt >= -90.0 && lt <= 90.0 );
1061 // lg *= rad2deg; // FIXME, optimize equations
1063 Ra = Radius[90+(gint)lt];
1065 cos (lt*DEG2RAD) * (lg - zero_long);
1066 *y = Ra * (lt - zero_lat);
1067 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
1068 *y = *y + dif / 1.85;
1069 *x = *x / pixelfact_x;
1070 *y = *y / pixelfact_y;
1071 *x = mapSizeX2 - *x;
1073 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1078 static void viewport_init_ra()
1080 static gboolean done_before = FALSE;
1084 for ( i = -90; i <= 90; i++)
1085 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
1090 double calcR (double lat)
1092 double a = 6378.137, r, sc, x, y, z;
1093 double e2 = 0.081082 * 0.081082;
1095 * the radius of curvature of an ellipsoidal Earth in the plane of the
1096 * meridian is given by
1098 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1101 * where a is the equatorial radius, b is the polar radius, and e is
1102 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1104 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1105 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1106 * = 0.081082 Eccentricity
1109 lat = lat * DEG2RAD;
1112 z = 1.0 - e2 * sc * sc;
1119 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1121 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1124 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1126 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1127 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1130 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1132 static GdkGCValues values;
1133 gdk_gc_get_values ( gc, &values );
1134 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1137 GdkFunction vik_gc_get_function ( GdkGC *gc )
1139 static GdkGCValues values;
1140 gdk_gc_get_values ( gc, &values );
1141 return values.function;
1144 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1146 vvp->drawmode = drawmode;
1147 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1148 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1150 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1154 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1156 return vvp->drawmode;
1159 /******** triggering *******/
1160 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1162 vp->trigger = trigger;
1165 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1170 void vik_viewport_snapshot_save ( VikViewport *vp )
1172 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1175 void vik_viewport_snapshot_load ( VikViewport *vp )
1177 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1180 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1182 vp->half_drawn = half_drawn;
1185 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1187 return vp->half_drawn;
1191 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1193 const gchar *name = NULL;
1194 VikWindow *vw = NULL;
1195 GtkWidget *mode_button;
1198 vw = VIK_WINDOW_FROM_WIDGET(vv);
1199 mode_button = vik_window_get_drawmode_button(vw, mode);
1200 label = gtk_bin_get_child(GTK_BIN(mode_button));
1202 name = gtk_label_get_text ( GTK_LABEL(label) );
1208 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1210 VikCoord tleft, tright, bleft, bright;
1212 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1213 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1214 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1215 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1217 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1218 vik_coord_convert(&tright, VIK_COORD_LATLON);
1219 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1220 vik_coord_convert(&bright, VIK_COORD_LATLON);
1222 *max_lat = MAX(tleft.north_south, tright.north_south);
1223 *min_lat = MIN(bleft.north_south, bright.north_south);
1224 *max_lon = MAX(tright.east_west, bright.east_west);
1225 *min_lon = MIN(tleft.east_west, bleft.east_west);
1228 void vik_viewport_reset_copyrights ( VikViewport *vp )
1230 g_return_if_fail ( vp != NULL );
1231 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1232 g_slist_free ( vp->copyrights );
1233 vp->copyrights = NULL;
1237 * vik_viewport_add_copyright:
1239 * @copyright: new copyright to display
1241 * Add a copyright to display on viewport.
1243 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1245 g_return_if_fail ( vp != NULL );
1248 gchar *found = (gchar*)g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1249 if ( found == NULL )
1251 gchar *duple = g_strdup ( copyright );
1252 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );
1257 void vik_viewport_reset_logos ( VikViewport *vp )
1259 g_return_if_fail ( vp != NULL );
1260 /* do not free elem */
1261 g_slist_free ( vp->logos );
1265 void vik_viewport_add_logo ( VikViewport *vp, const GdkPixbuf *logo )
1267 g_return_if_fail ( vp != NULL );
1270 GdkPixbuf *found = NULL; /* FIXME (GdkPixbuf*)g_slist_find_custom ( vp->logos, logo, (GCompareFunc)== ); */
1271 if ( found == NULL )
1273 vp->logos = g_slist_prepend ( vp->logos, (gpointer)logo );