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;
52 static void viewport_class_init ( VikViewportClass *klass );
53 static void viewport_init ( VikViewport *vvp );
54 static void viewport_finalize ( GObject *gob );
55 static void viewport_utm_zone_check ( VikViewport *vvp );
57 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 );
58 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 );
59 double calcR (double lat);
61 static double Radius[181];
62 static void viewport_init_ra();
64 static GObjectClass *parent_class;
68 GtkDrawingArea drawing_area;
69 GdkPixmap *scr_buffer;
72 VikCoordMode coord_mode;
75 GdkPixbuf *alpha_pixbuf;
76 guint8 alpha_pixbuf_width;
77 guint8 alpha_pixbuf_height;
79 gdouble utm_zone_width;
80 gboolean one_utm_zone;
83 GdkColor background_color;
88 /* Wether or not display OSD info */
90 gboolean draw_copyright;
91 gboolean draw_centermark;
93 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
94 VikViewportDrawMode drawmode;
96 /* handy conversion factors which make google plotting extremely fast */
97 gdouble google_calcx_fact;
98 gdouble google_calcy_fact;
99 gdouble google_calcx_rev_fact;
100 gdouble google_calcy_rev_fact;
104 GdkPixmap *snapshot_buffer;
109 viewport_utm_zone_width ( VikViewport *vvp )
111 if ( vvp->coord_mode == VIK_COORD_UTM ) {
114 /* get latitude of screen bottom */
115 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
116 utm.northing -= vvp -> height * vvp -> ympp / 2;
117 a_coords_utm_to_latlon ( &utm, &ll );
120 ll.lon = (utm.zone - 1) * 6 - 180 ;
121 a_coords_latlon_to_utm ( &ll, &utm);
122 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
128 GType vik_viewport_get_type (void)
130 static GType vvp_type = 0;
134 static const GTypeInfo vvp_info =
136 sizeof (VikViewportClass),
137 NULL, /* base_init */
138 NULL, /* base_finalize */
139 (GClassInitFunc) viewport_class_init,
140 NULL, /* class_finalize */
141 NULL, /* class_data */
142 sizeof (VikViewport),
144 (GInstanceInitFunc) viewport_init,
146 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
151 static void viewport_class_init ( VikViewportClass *klass )
154 GObjectClass *object_class;
156 object_class = G_OBJECT_CLASS (klass);
158 object_class->finalize = viewport_finalize;
160 parent_class = g_type_class_peek_parent (klass);
163 VikViewport *vik_viewport_new ()
165 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
169 static void viewport_init ( VikViewport *vvp )
175 ll.lat = a_vik_get_default_lat();
176 ll.lon = a_vik_get_default_long();
177 a_coords_latlon_to_utm ( &ll, &utm );
179 /* TODO: not static */
182 vvp->coord_mode = VIK_COORD_LATLON;
183 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
184 vvp->center.mode = VIK_COORD_LATLON;
185 vvp->center.north_south = ll.lat;
186 vvp->center.east_west = ll.lon;
187 vvp->center.utm_zone = (int)utm.zone;
188 vvp->center.utm_letter = utm.letter;
189 vvp->scr_buffer = NULL;
190 vvp->alpha_pixbuf = NULL;
191 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
192 vvp->utm_zone_width = 0.0;
193 vvp->background_gc = NULL;
194 vvp->scale_bg_gc = NULL;
196 vvp->copyrights = NULL;
198 vvp->draw_scale = TRUE;
199 vvp->draw_copyright = TRUE;
200 vvp->draw_centermark = TRUE;
203 vvp->snapshot_buffer = NULL;
204 vvp->half_drawn = FALSE;
206 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
208 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
211 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
213 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
214 *rv = vvp->background_color;
218 /* returns pointer to internal static storage, changes next time function called, use quickly */
219 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
221 static gchar color[8];
222 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));
226 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
228 g_assert ( vvp && vvp->background_gc );
229 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
230 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
232 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
235 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
237 g_assert ( vvp && vvp->background_gc );
238 vvp->background_color = *color;
239 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
243 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
248 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
249 if ( gdk_color_parse ( colorname, &color ) )
250 gdk_gc_set_rgb_fg_color ( rv, &color );
252 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
253 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
257 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
261 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
262 gdk_gc_set_rgb_fg_color ( rv, color );
263 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
267 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
270 vvp->height = height;
271 if ( vvp->scr_buffer )
272 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
273 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
275 /* TODO trigger: only if this is enabled !!! */
276 if ( vvp->snapshot_buffer )
277 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
278 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
282 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
284 return vvp->scr_buffer;
287 gboolean vik_viewport_configure ( VikViewport *vvp )
289 g_return_val_if_fail ( vvp != NULL, TRUE );
291 vvp->width = GTK_WIDGET(vvp)->allocation.width;
292 vvp->height = GTK_WIDGET(vvp)->allocation.height;
294 if ( vvp->scr_buffer )
295 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
297 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
299 /* TODO trigger: only if enabled! */
300 if ( vvp->snapshot_buffer )
301 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
303 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
306 /* this is down here so it can get a GC (necessary?) */
307 if ( !vvp->background_gc )
309 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
310 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
312 if ( !vvp->scale_bg_gc) {
313 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
319 static void viewport_finalize ( GObject *gob )
321 VikViewport *vvp = VIK_VIEWPORT(gob);
323 g_return_if_fail ( vvp != NULL );
325 if ( vvp->scr_buffer )
326 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
328 if ( vvp->snapshot_buffer )
329 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
331 if ( vvp->alpha_pixbuf )
332 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
334 if ( vvp->background_gc )
335 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
337 if ( vvp->scale_bg_gc ) {
338 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
339 vvp->scale_bg_gc = NULL;
342 G_OBJECT_CLASS(parent_class)->finalize(gob);
345 void vik_viewport_clear ( VikViewport *vvp )
347 g_return_if_fail ( vvp != NULL );
348 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
349 vik_viewport_reset_copyrights ( vvp );
352 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
354 vvp->draw_scale = draw_scale;
357 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
359 return vvp->draw_scale;
362 void vik_viewport_draw_scale ( VikViewport *vvp )
364 g_return_if_fail ( vvp != NULL );
366 if ( vvp->draw_scale ) {
367 VikCoord left, right;
368 gdouble unit, base, diff, old_unit, old_diff, ratio;
369 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
370 PangoFontDescription *pfd;
374 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
375 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
377 vik_units_distance_t dist_units = a_vik_get_units_distance ();
378 switch (dist_units) {
379 case VIK_UNITS_DISTANCE_KILOMETRES:
380 base = vik_coord_diff ( &left, &right ); // in meters
382 case VIK_UNITS_DISTANCE_MILES:
383 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
384 base = vik_coord_diff ( &left, &right ) * 0.00621371192;
387 base = 1; // Keep the compiler happy
388 g_critical("Houston, we've had a problem. distance=%d", dist_units);
390 ratio = (vvp->width/SCSIZE)/base;
393 diff = fabs(base-unit);
397 while (diff <= old_diff) {
400 unit = unit * (odd%2 ? 5 : 2);
401 diff = fabs(base-unit);
407 /* white background */
408 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
409 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
410 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
411 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
412 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
413 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
415 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
416 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
417 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
418 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
419 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
420 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
423 for (i=1; i<5; i++) {
424 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
425 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
426 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
427 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
431 for (i=1; i<10; i++) {
432 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
433 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
434 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
435 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
438 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
439 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
440 pango_layout_set_font_description (pl, pfd);
441 pango_font_description_free (pfd);
443 switch (dist_units) {
444 case VIK_UNITS_DISTANCE_KILOMETRES:
446 sprintf(s, "%d km", (int)unit/1000);
448 sprintf(s, "%d m", (int)unit);
451 case VIK_UNITS_DISTANCE_MILES:
452 // Handle units in 0.1 miles
454 sprintf(s, "%0.1f miles", unit/10.0);
456 else if ((int)unit == 10.0) {
457 sprintf(s, "1 mile");
460 sprintf(s, "%d miles", (int)(unit/10.0));
464 g_critical("Houston, we've had a problem. distance=%d", dist_units);
466 pango_layout_set_text(pl, s, -1);
467 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
468 PAD + len + PAD, vvp->height - PAD - 10, pl);
474 void vik_viewport_set_draw_copyright ( VikViewport *vvp, gboolean draw_copyright )
476 vvp->draw_copyright = draw_copyright;
479 gboolean vik_viewport_get_draw_copyright ( VikViewport *vvp )
481 return vvp->draw_copyright;
484 void vik_viewport_draw_copyright ( VikViewport *vvp )
486 g_return_if_fail ( vvp != NULL );
488 if ( !vvp->draw_copyright )
492 PangoFontDescription *pfd;
494 PangoRectangle ink_rect, logical_rect;
497 /* compute copyrights string */
498 guint len = g_slist_length ( vvp->copyrights );
500 for (i = 0 ; i < len ; i++)
502 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
503 strcat ( s, copyright );
507 /* create pango layout */
508 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
509 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
510 pango_layout_set_font_description (pl, pfd);
511 pango_font_description_free (pfd);
513 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
516 pango_layout_set_text(pl, s, -1);
518 /* Use maximum of half the viewport width */
519 pango_layout_set_width ( pl, ( vvp->width / 2 - PAD ) * PANGO_SCALE );
520 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
521 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
522 vvp->width / 2, vvp->height - PAD - logical_rect.height, pl);
529 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
531 vvp->draw_centermark = draw_centermark;
534 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
536 return vvp->draw_centermark;
539 void vik_viewport_draw_centermark ( VikViewport *vvp )
541 g_return_if_fail ( vvp != NULL );
543 if ( !vvp->draw_centermark )
548 int center_x = vvp->width/2;
549 int center_y = vvp->height/2;
550 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
552 /* white back ground */
553 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
554 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
555 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
556 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
557 /* black fore ground */
558 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
559 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
560 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
561 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
565 void vik_viewport_sync ( VikViewport *vvp )
567 g_return_if_fail ( vvp != NULL );
568 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);
571 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
575 g_return_if_fail ( vvp != NULL );
576 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);
582 x = vvp->width+x_off;
589 y = vvp->height+y_off;
592 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
593 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
596 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
598 g_return_if_fail ( vvp != NULL );
599 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
600 vvp->xmpp = vvp->ympp = xympp;
602 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
603 viewport_utm_zone_check(vvp);
606 /* or could do factor */
607 void vik_viewport_zoom_in ( VikViewport *vvp )
609 g_return_if_fail ( vvp != NULL );
610 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
615 viewport_utm_zone_check(vvp);
619 void vik_viewport_zoom_out ( VikViewport *vvp )
621 g_return_if_fail ( vvp != NULL );
622 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
627 viewport_utm_zone_check(vvp);
631 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
633 if ( vvp->xmpp == vvp->ympp )
638 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
643 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
648 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
650 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
652 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
653 viewport_utm_zone_check(vvp);
657 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
659 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
661 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
662 viewport_utm_zone_check(vvp);
667 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
669 g_return_val_if_fail ( vvp != NULL, NULL );
670 return &(vvp->center);
673 /* called every time we update coordinates/zoom */
674 static void viewport_utm_zone_check ( VikViewport *vvp )
676 if ( vvp->coord_mode == VIK_COORD_UTM )
680 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
681 a_coords_latlon_to_utm ( &ll, &utm );
682 if ( utm.zone != vvp->center.utm_zone )
683 *((struct UTM *)(&vvp->center)) = utm;
685 /* misc. stuff so we don't have to check later */
686 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
687 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
691 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
693 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
694 if ( vvp->coord_mode == VIK_COORD_UTM )
695 viewport_utm_zone_check ( vvp );
698 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
700 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
701 if ( vvp->coord_mode == VIK_COORD_UTM )
702 viewport_utm_zone_check ( vvp );
705 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
707 vvp->center = *coord;
708 if ( vvp->coord_mode == VIK_COORD_UTM )
709 viewport_utm_zone_check ( vvp );
712 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
714 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
716 /* get center, then just offset */
717 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
718 ul->mode = VIK_COORD_UTM;
721 ul->north_south += (vvp->ympp * vvp->height / 2);
722 ul->east_west -= (vvp->xmpp * vvp->width / 2);
723 br->north_south -= (vvp->ympp * vvp->height / 2);
724 br->east_west += (vvp->xmpp * vvp->width / 2);
727 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
729 if ( vvp->coord_mode == VIK_COORD_UTM ) {
730 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
731 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
736 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
738 if ( vvp->coord_mode == VIK_COORD_UTM ) {
740 g_assert ( vvp != NULL );
741 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
742 return coord.utm_zone;
747 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
749 if ( vvp->coord_mode == VIK_COORD_UTM ) {
751 g_assert ( vvp != NULL );
752 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
753 return coord.utm_zone;
759 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
761 g_return_if_fail ( vvp != NULL );
762 if ( vvp->coord_mode == VIK_COORD_UTM ) {
763 /* slightly optimized */
764 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
765 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
766 viewport_utm_zone_check ( vvp );
769 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
770 vik_viewport_set_center_coord ( vvp, &tmp );
774 gint vik_viewport_get_width( VikViewport *vvp )
776 g_return_val_if_fail ( vvp != NULL, 0 );
780 gint vik_viewport_get_height( VikViewport *vvp )
782 g_return_val_if_fail ( vvp != NULL, 0 );
786 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
788 g_return_if_fail ( vvp != NULL );
790 if ( vvp->coord_mode == VIK_COORD_UTM ) {
792 struct UTM *utm = (struct UTM *) coord;
793 coord->mode = VIK_COORD_UTM;
795 utm->zone = vvp->center.utm_zone;
796 utm->letter = vvp->center.utm_letter;
797 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
798 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
799 utm->zone += zone_delta;
800 utm->easting -= zone_delta * vvp->utm_zone_width;
801 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
802 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
803 coord->mode = VIK_COORD_LATLON;
804 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
805 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
806 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
807 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
808 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);
809 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
811 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
812 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
815 --> THIS IS JUNK HERE.
816 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
818 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
819 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
825 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
828 g_return_if_fail ( vvp != NULL );
830 if ( coord->mode != vvp->coord_mode )
832 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
833 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
837 if ( vvp->coord_mode == VIK_COORD_UTM ) {
838 struct UTM *center = (struct UTM *) &(vvp->center);
839 struct UTM *utm = (struct UTM *) coord;
840 if ( center->zone != utm->zone && vvp->one_utm_zone )
842 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
846 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
847 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
848 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
849 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
850 struct LatLon *center = (struct LatLon *) &(vvp->center);
851 struct LatLon *ll = (struct LatLon *) coord;
853 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
854 /* FIXMERCATOR: Optimize */
855 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
856 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
857 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
858 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 );
860 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
861 /* FIXMERCATOR: Optimize */
862 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
863 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
868 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
870 if ( *x1 > 20000 || *x1 < -20000 ) {
871 gdouble shrinkfactor = ABS(20000.0 / *x1);
872 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
873 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
874 } else if ( *y1 > 20000 || *y1 < -20000 ) {
875 gdouble shrinkfactor = ABS(20000.0 / *x1);
876 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
877 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
878 } else if ( *x2 > 20000 || *x2 < -20000 ) {
879 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
880 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
881 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
882 g_print("%f, %d, %d\n", shrinkfactor, *x2, *y2);
883 } else if ( *y2 > 20000 || *y2 < -20000 ) {
884 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
885 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
886 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
890 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
892 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
893 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
894 /*** clipping, yeah! ***/
895 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
896 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
900 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
902 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
903 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
906 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
908 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
909 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
912 /* shouldn't use this -- slow -- change the alpha channel instead. */
913 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
914 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
916 gint real_dest_x = MAX(dest_x,0);
917 gint real_dest_y = MAX(dest_y,0);
920 return; /* don't waste your time */
922 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
924 if ( vvp->alpha_pixbuf )
925 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
926 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
927 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
928 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
931 w = MIN(w,vvp->width - dest_x);
932 h = MIN(h,vvp->height - dest_y);
934 /* check that we are drawing within boundaries. */
935 src_x += (real_dest_x - dest_x);
936 src_y += (real_dest_y - dest_y);
937 w -= (real_dest_x - dest_x);
938 h -= (real_dest_y - dest_y);
940 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
941 real_dest_x, real_dest_y, 0, 0, w, h );
944 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
946 /* draw pixbuf_tmp */
947 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
950 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
951 gint dest_x, gint dest_y, gint w, gint h )
953 gdk_draw_pixbuf ( vvp->scr_buffer,
954 // GTK_WIDGET(vvp)->style->black_gc,
957 src_x, src_y, dest_x, dest_y, w, h,
958 GDK_RGB_DITHER_NONE, 0, 0 );
961 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
963 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
967 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
969 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
972 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
975 return vvp->coord_mode;
978 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
980 g_return_if_fail ( vvp != NULL );
981 vvp->coord_mode = mode;
982 vik_coord_convert ( &(vvp->center), mode );
985 /* Thanks GPSDrive */
986 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 )
989 gdouble dif, lat, lon;
990 double Ra = Radius[90+(gint)zero_lat];
992 px = (mapSizeX2 - x) * pixelfact_x;
993 py = (-mapSizeY2 + y) * pixelfact_y;
995 lat = zero_lat - py / Ra;
996 lat = zero_lat - py / Ra;
1000 cos (lat * DEG2RAD));
1002 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
1003 lat = lat - dif / 1.5;
1007 cos (lat * DEG2RAD));
1014 /* Thanks GPSDrive */
1015 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 )
1019 gint mapSizeX = 2 * mapSizeX2;
1020 gint mapSizeY = 2 * mapSizeY2;
1022 g_assert ( lt >= -90.0 && lt <= 90.0 );
1023 // lg *= rad2deg; // FIXME, optimize equations
1025 Ra = Radius[90+(gint)lt];
1027 cos (lt*DEG2RAD) * (lg - zero_long);
1028 *y = Ra * (lt - zero_lat);
1029 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
1030 *y = *y + dif / 1.85;
1031 *x = *x / pixelfact_x;
1032 *y = *y / pixelfact_y;
1033 *x = mapSizeX2 - *x;
1035 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1040 static void viewport_init_ra()
1042 static gboolean done_before = FALSE;
1046 for ( i = -90; i <= 90; i++)
1047 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
1052 double calcR (double lat)
1054 double a = 6378.137, r, sc, x, y, z;
1055 double e2 = 0.081082 * 0.081082;
1057 * the radius of curvature of an ellipsoidal Earth in the plane of the
1058 * meridian is given by
1060 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1063 * where a is the equatorial radius, b is the polar radius, and e is
1064 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1066 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1067 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1068 * = 0.081082 Eccentricity
1071 lat = lat * DEG2RAD;
1074 z = 1.0 - e2 * sc * sc;
1081 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1083 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1086 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1088 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1089 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1092 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1094 static GdkGCValues values;
1095 gdk_gc_get_values ( gc, &values );
1096 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1099 GdkFunction vik_gc_get_function ( GdkGC *gc )
1101 static GdkGCValues values;
1102 gdk_gc_get_values ( gc, &values );
1103 return values.function;
1106 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1108 vvp->drawmode = drawmode;
1109 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1110 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1112 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1116 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1118 return vvp->drawmode;
1121 /******** triggering *******/
1122 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1124 vp->trigger = trigger;
1127 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1132 void vik_viewport_snapshot_save ( VikViewport *vp )
1134 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1137 void vik_viewport_snapshot_load ( VikViewport *vp )
1139 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1142 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1144 vp->half_drawn = half_drawn;
1147 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1149 return vp->half_drawn;
1153 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1155 const gchar *name = NULL;
1156 VikWindow *vw = NULL;
1157 GtkWidget *mode_button;
1160 vw = VIK_WINDOW_FROM_WIDGET(vv);
1161 mode_button = vik_window_get_drawmode_button(vw, mode);
1162 label = gtk_bin_get_child(GTK_BIN(mode_button));
1164 name = gtk_label_get_text ( GTK_LABEL(label) );
1170 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1172 VikCoord tleft, tright, bleft, bright;
1174 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1175 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1176 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1177 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1179 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1180 vik_coord_convert(&tright, VIK_COORD_LATLON);
1181 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1182 vik_coord_convert(&bright, VIK_COORD_LATLON);
1184 *max_lat = MAX(tleft.north_south, tright.north_south);
1185 *min_lat = MIN(bleft.north_south, bright.north_south);
1186 *max_lon = MAX(tright.east_west, bright.east_west);
1187 *min_lon = MIN(tleft.east_west, bleft.east_west);
1190 void vik_viewport_reset_copyrights ( VikViewport *vp )
1192 g_return_if_fail ( vp != NULL );
1193 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1194 g_slist_free ( vp->copyrights );
1195 vp->copyrights = NULL;
1198 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1200 g_return_if_fail ( vp != NULL );
1203 gchar *found = (gchar*)g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1204 if ( found == NULL )
1206 gchar *duple = g_strdup ( copyright );
1207 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );