2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2005, 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
27 #define DEFAULT_BACKGROUND_COLOR "#CCCCCC"
35 #include "vikwindow.h"
36 #include "vikviewport.h"
42 #include "googlemaps.h"
45 static gdouble EASTING_OFFSET = 500000.0;
47 static void viewport_class_init ( VikViewportClass *klass );
48 static void viewport_init ( VikViewport *vvp );
49 static void viewport_finalize ( GObject *gob );
50 static void viewport_utm_zone_check ( VikViewport *vvp );
52 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 );
53 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 );
54 double calcR (double lat);
56 static double Radius[181];
57 static void viewport_init_ra();
59 static GObjectClass *parent_class;
61 static void viewport_google_rezoom ( VikViewport *vvp );
65 GtkDrawingArea drawing_area;
66 GdkPixmap *scr_buffer;
69 VikCoordMode coord_mode;
72 GdkPixbuf *alpha_pixbuf;
73 guint8 alpha_pixbuf_width;
74 guint8 alpha_pixbuf_height;
76 gdouble utm_zone_width;
77 gboolean one_utm_zone;
80 GdkColor background_color;
83 gboolean draw_centermark;
85 /* Parent VikWindow */
88 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
89 VikViewportDrawMode drawmode;
91 /* handy conversion factors which make google plotting extremely fast */
92 gdouble google_calcx_fact;
93 gdouble google_calcy_fact;
94 gdouble google_calcx_rev_fact;
95 gdouble google_calcy_rev_fact;
99 viewport_utm_zone_width ( VikViewport *vvp )
101 if ( vvp->coord_mode == VIK_COORD_UTM ) {
104 /* get latitude of screen bottom */
105 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
106 utm.northing -= vvp -> height * vvp -> ympp / 2;
107 a_coords_utm_to_latlon ( &utm, &ll );
110 ll.lon = (utm.zone - 1) * 6 - 180 ;
111 a_coords_latlon_to_utm ( &ll, &utm);
112 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
118 GType vik_viewport_get_type (void)
120 static GType vvp_type = 0;
124 static const GTypeInfo vvp_info =
126 sizeof (VikViewportClass),
127 NULL, /* base_init */
128 NULL, /* base_finalize */
129 (GClassInitFunc) viewport_class_init,
130 NULL, /* class_finalize */
131 NULL, /* class_data */
132 sizeof (VikViewport),
134 (GInstanceInitFunc) viewport_init,
136 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
141 static void viewport_class_init ( VikViewportClass *klass )
144 GObjectClass *object_class;
146 object_class = G_OBJECT_CLASS (klass);
148 object_class->finalize = viewport_finalize;
150 parent_class = g_type_class_peek_parent (klass);
153 VikViewport *vik_viewport_new (VikWindow *vw)
155 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
160 static void viewport_init ( VikViewport *vvp )
164 /* TODO: not static */
167 vvp->coord_mode = VIK_COORD_LATLON;
168 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
169 vvp->center.north_south = 0;
170 vvp->center.east_west = -166021;
171 vvp->center.utm_zone = 31;
172 vvp->center.utm_letter = 'N';
173 vvp->scr_buffer = NULL;
174 vvp->alpha_pixbuf = NULL;
175 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
176 vvp->utm_zone_width = 0.0;
177 vvp->background_gc = NULL;
178 vvp->scale_bg_gc = NULL;
179 vvp->draw_scale = TRUE;
180 vvp->draw_centermark = TRUE;
181 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
184 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
186 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
187 *rv = vvp->background_color;
191 /* returns pointer to internal static storage, changes next time function called, use quickly */
192 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
194 static gchar color[8];
195 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));
199 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
201 g_assert ( vvp->background_gc );
202 gdk_color_parse ( colorname, &(vvp->background_color) );
203 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
206 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
208 g_assert ( vvp->background_gc );
209 vvp->background_color = *color;
210 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
214 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
219 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
220 gdk_color_parse ( colorname, &color );
221 gdk_gc_set_rgb_fg_color ( rv, &color );
222 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
226 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
230 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
231 gdk_gc_set_rgb_fg_color ( rv, color );
232 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
236 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
239 vvp->height = height;
240 if ( vvp->scr_buffer )
241 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
242 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
246 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
248 return vvp->scr_buffer;
251 gboolean vik_viewport_configure ( VikViewport *vvp )
253 g_return_val_if_fail ( vvp != NULL, TRUE );
255 vvp->width = GTK_WIDGET(vvp)->allocation.width;
256 vvp->height = GTK_WIDGET(vvp)->allocation.height;
258 if ( vvp->scr_buffer )
259 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
261 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
263 /* this is down here so it can get a GC (necessary?) */
264 if ( ! vvp->background_gc )
266 vvp->background_gc = vik_viewport_new_gc ( vvp, "", 1 );
267 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR ); /* set to "backup" color in vvp->background_color */
269 if ( !vvp->scale_bg_gc) {
270 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
276 static void viewport_finalize ( GObject *gob )
278 VikViewport *vvp = VIK_VIEWPORT(gob);
280 g_return_if_fail ( vvp != NULL );
282 if ( vvp->scr_buffer )
283 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
285 if ( vvp->alpha_pixbuf )
286 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
288 if ( vvp->background_gc )
289 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
291 if ( vvp->scale_bg_gc ) {
292 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
293 vvp->scale_bg_gc = NULL;
296 G_OBJECT_CLASS(parent_class)->finalize(gob);
299 void vik_viewport_clear ( VikViewport *vvp )
301 g_return_if_fail ( vvp != NULL );
302 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
305 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
307 vvp->draw_scale = draw_scale;
310 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
312 return vvp->draw_scale;
315 void vik_viewport_draw_scale ( VikViewport *vvp )
317 if ( vvp->draw_scale ) {
318 VikCoord left, right;
319 gdouble unit, base, diff, old_unit, old_diff, ratio;
320 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
321 PangoFontDescription *pfd;
325 g_return_if_fail ( vvp != NULL );
327 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
328 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
330 base = vik_coord_diff ( &left, &right ); // in meters
331 ratio = (vvp->width/SCSIZE)/base;
334 diff = fabs(base-unit);
338 while (diff <= old_diff) {
341 unit = unit * (odd%2 ? 5 : 2);
342 diff = fabs(base-unit);
348 /* white background */
349 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
350 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
351 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
352 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
353 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
354 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
356 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
357 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
358 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
359 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
360 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
361 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
364 for (i=1; i<5; i++) {
365 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
366 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
367 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
368 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
372 for (i=1; i<10; i++) {
373 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
374 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
375 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
376 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
379 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
380 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
381 pango_layout_set_font_description (pl, pfd);
382 pango_font_description_free (pfd);
385 sprintf(s, "%d km", (int)unit/1000);
387 sprintf(s, "%d m", (int)unit);
389 pango_layout_set_text(pl, s, -1);
390 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
391 PAD + len + PAD, vvp->height - PAD - 10, pl);
395 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
397 vvp->draw_centermark = draw_centermark;
400 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
402 return vvp->draw_centermark;
405 void vik_viewport_draw_centermark ( VikViewport *vvp )
407 if ( !vvp->draw_centermark )
412 int center_x = vvp->width/2;
413 int center_y = vvp->height/2;
414 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
416 /* white back ground */
417 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
418 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
419 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
420 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
421 /* black fore ground */
422 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
423 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
424 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
425 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
429 void vik_viewport_sync ( VikViewport *vvp )
431 g_return_if_fail ( vvp != NULL );
432 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);
435 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
439 g_return_if_fail ( vvp != NULL );
440 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);
446 x = vvp->width+x_off;
453 y = vvp->height+y_off;
456 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
457 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
460 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
462 g_return_if_fail ( vvp != NULL );
463 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
464 vvp->xmpp = vvp->ympp = xympp;
466 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
467 viewport_utm_zone_check(vvp);
468 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
469 viewport_google_rezoom ( vvp );
472 /* or could do factor */
473 void vik_viewport_zoom_in ( VikViewport *vvp )
475 g_return_if_fail ( vvp != NULL );
476 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
481 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
482 viewport_google_rezoom ( vvp );
484 viewport_utm_zone_check(vvp);
488 void vik_viewport_zoom_out ( VikViewport *vvp )
490 g_return_if_fail ( vvp != NULL );
491 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
496 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
497 viewport_google_rezoom ( vvp );
499 viewport_utm_zone_check(vvp);
503 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
505 if ( vvp->xmpp == vvp->ympp )
510 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
515 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
520 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
522 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
524 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
525 viewport_utm_zone_check(vvp);
526 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
527 viewport_google_rezoom ( vvp );
531 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
533 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
535 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
536 viewport_utm_zone_check(vvp);
537 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
538 viewport_google_rezoom ( vvp );
543 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
545 g_return_val_if_fail ( vvp != NULL, NULL );
546 return &(vvp->center);
549 /* called every time we update coordinates/zoom */
550 static void viewport_utm_zone_check ( VikViewport *vvp )
552 if ( vvp->coord_mode == VIK_COORD_UTM )
556 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
557 a_coords_latlon_to_utm ( &ll, &utm );
558 if ( utm.zone != vvp->center.utm_zone )
559 *((struct UTM *)(&vvp->center)) = utm;
561 /* misc. stuff so we don't have to check later */
562 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
563 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
567 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
569 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
570 if ( vvp->coord_mode == VIK_COORD_UTM )
571 viewport_utm_zone_check ( vvp );
574 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
576 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
577 if ( vvp->coord_mode == VIK_COORD_UTM )
578 viewport_utm_zone_check ( vvp );
581 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
583 vvp->center = *coord;
584 if ( vvp->coord_mode == VIK_COORD_UTM )
585 viewport_utm_zone_check ( vvp );
588 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
590 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
592 /* get center, then just offset */
593 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
594 ul->mode = VIK_COORD_UTM;
597 ul->north_south += (vvp->ympp * vvp->height / 2);
598 ul->east_west -= (vvp->xmpp * vvp->width / 2);
599 br->north_south -= (vvp->ympp * vvp->height / 2);
600 br->east_west += (vvp->xmpp * vvp->width / 2);
603 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
605 if ( vvp->coord_mode == VIK_COORD_UTM ) {
606 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
607 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
612 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
614 if ( vvp->coord_mode == VIK_COORD_UTM ) {
616 g_assert ( vvp != NULL );
617 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
618 return coord.utm_zone;
623 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
625 if ( vvp->coord_mode == VIK_COORD_UTM ) {
627 g_assert ( vvp != NULL );
628 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
629 return coord.utm_zone;
635 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
637 g_return_if_fail ( vvp != NULL );
638 if ( vvp->coord_mode == VIK_COORD_UTM ) {
639 /* slightly optimized */
640 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
641 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
642 viewport_utm_zone_check ( vvp );
645 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
646 vik_viewport_set_center_coord ( vvp, &tmp );
650 gint vik_viewport_get_width( VikViewport *vvp )
652 g_return_val_if_fail ( vvp != NULL, 0 );
656 gint vik_viewport_get_height( VikViewport *vvp )
658 g_return_val_if_fail ( vvp != NULL, 0 );
662 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
664 if ( vvp->coord_mode == VIK_COORD_UTM ) {
666 struct UTM *utm = (struct UTM *) coord;
667 coord->mode = VIK_COORD_UTM;
669 g_return_if_fail ( vvp != NULL );
671 utm->zone = vvp->center.utm_zone;
672 utm->letter = vvp->center.utm_letter;
673 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
674 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
675 utm->zone += zone_delta;
676 utm->easting -= zone_delta * vvp->utm_zone_width;
677 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
678 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
679 coord->mode = VIK_COORD_LATLON;
680 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
681 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);
682 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
684 coord->east_west = (x - (vvp->width/2)) * vvp->google_calcx_rev_fact + vvp->center.east_west;
685 coord->north_south = ((vvp->height/2) - y) * vvp->google_calcy_rev_fact + vvp->center.north_south;
686 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
687 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
688 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
689 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
691 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
692 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
695 --> THIS IS JUNK HERE.
696 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
698 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
699 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
705 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
708 g_return_if_fail ( vvp != NULL );
710 if ( coord->mode != vvp->coord_mode )
712 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
713 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
717 if ( vvp->coord_mode == VIK_COORD_UTM ) {
718 struct UTM *center = (struct UTM *) &(vvp->center);
719 struct UTM *utm = (struct UTM *) coord;
720 if ( center->zone != utm->zone && vvp->one_utm_zone )
722 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
726 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
727 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
728 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
729 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
730 struct LatLon *center = (struct LatLon *) &(vvp->center);
731 struct LatLon *ll = (struct LatLon *) coord;
733 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
734 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 );
736 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
738 *x = vvp->google_calcx_fact * (ll->lon - center->lon) + (vvp->width/2);
739 *y = vvp->google_calcy_fact * (center->lat - ll->lat) + (vvp->height/2);
740 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
741 /* subtract, convert to KH coords; blow it up by 256 */
742 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
743 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
744 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
745 /* FIXMERCATOR: Optimize */
746 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
747 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
752 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
754 if ( *x1 > 20000 || *x1 < -20000 ) {
755 gdouble shrinkfactor = ABS(20000.0 / *x1);
756 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
757 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
758 } else if ( *y1 > 20000 || *y1 < -20000 ) {
759 gdouble shrinkfactor = ABS(20000.0 / *x1);
760 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
761 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
762 } else if ( *x2 > 20000 || *x2 < -20000 ) {
763 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
764 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
765 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
766 g_print("%f, %d, %d\n", shrinkfactor, *x2, *y2);
767 } else if ( *y2 > 20000 || *y2 < -20000 ) {
768 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
769 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
770 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
774 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
776 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
777 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
778 /*** clipping, yeah! ***/
779 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
780 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
784 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
786 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
787 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
790 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
792 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
793 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
796 /* shouldn't use this -- slow -- change the alpha channel instead. */
797 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
798 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
800 gint real_dest_x = MAX(dest_x,0);
801 gint real_dest_y = MAX(dest_y,0);
804 return; /* don't waste your time */
806 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
808 if ( vvp->alpha_pixbuf )
809 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
810 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
811 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
812 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
815 w = MIN(w,vvp->width - dest_x);
816 h = MIN(h,vvp->height - dest_y);
818 /* check that we are drawing within boundaries. */
819 src_x += (real_dest_x - dest_x);
820 src_y += (real_dest_y - dest_y);
821 w -= (real_dest_x - dest_x);
822 h -= (real_dest_y - dest_y);
824 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
825 real_dest_x, real_dest_y, 0, 0, w, h );
828 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
830 /* draw pixbuf_tmp */
831 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
834 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
835 gint dest_x, gint dest_y, gint w, gint h )
837 gdk_draw_pixbuf ( vvp->scr_buffer,
838 // GTK_WIDGET(vvp)->style->black_gc,
841 src_x, src_y, dest_x, dest_y, w, h,
842 GDK_RGB_DITHER_NONE, 0, 0 );
845 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
847 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
851 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
853 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
856 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
859 return vvp->coord_mode;
862 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
864 g_return_if_fail ( vvp != NULL );
865 vvp->coord_mode = mode;
866 vik_coord_convert ( &(vvp->center), mode );
869 /* Thanks GPSDrive */
870 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 )
873 gdouble dif, lat, lon;
874 double Ra = Radius[90+(gint)zero_lat];
876 px = (mapSizeX2 - x) * pixelfact_x;
877 py = (-mapSizeY2 + y) * pixelfact_y;
879 lat = zero_lat - py / Ra;
880 lat = zero_lat - py / Ra;
884 cos (lat * DEG2RAD));
886 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
887 lat = lat - dif / 1.5;
891 cos (lat * DEG2RAD));
898 /* Thanks GPSDrive */
899 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 )
903 gint mapSizeX = 2 * mapSizeX2;
904 gint mapSizeY = 2 * mapSizeY2;
906 g_assert ( lt >= -90.0 && lt <= 90.0 );
907 // lg *= rad2deg; // FIXME, optimize equations
909 Ra = Radius[90+(gint)lt];
911 cos (lt*DEG2RAD) * (lg - zero_long);
912 *y = Ra * (lt - zero_lat);
913 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
914 *y = *y + dif / 1.85;
915 *x = *x / pixelfact_x;
916 *y = *y / pixelfact_y;
919 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
924 static void viewport_init_ra()
926 static gboolean done_before = FALSE;
930 for ( i = -90; i <= 90; i++)
931 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
936 double calcR (double lat)
938 double a = 6378.137, r, sc, x, y, z;
939 double e2 = 0.081082 * 0.081082;
941 * the radius of curvature of an ellipsoidal Earth in the plane of the
942 * meridian is given by
944 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
947 * where a is the equatorial radius, b is the polar radius, and e is
948 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
950 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
951 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
952 * = 0.081082 Eccentricity
958 z = 1.0 - e2 * sc * sc;
965 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
967 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
970 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
972 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
973 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
976 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
978 static GdkGCValues values;
979 gdk_gc_get_values ( gc, &values );
980 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
983 GdkFunction vik_gc_get_function ( GdkGC *gc )
985 static GdkGCValues values;
986 gdk_gc_get_values ( gc, &values );
987 return values.function;
990 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
992 vvp->drawmode = drawmode;
993 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
994 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
996 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
997 if ( drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
998 viewport_google_rezoom ( vvp );
1002 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1004 return vvp->drawmode;
1007 static void viewport_google_rezoom ( VikViewport *vvp )
1009 vvp->google_calcx_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 * 0.7716245833877 / vvp->xmpp);
1010 vvp->google_calcy_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 / vvp->ympp);
1011 vvp->google_calcx_rev_fact = 1 / vvp->google_calcx_fact;
1012 vvp->google_calcy_rev_fact = 1 / vvp->google_calcy_fact;
1016 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1018 const gchar *name = NULL;
1019 GtkWidget *mode_button;
1022 mode_button = vik_window_get_drawmode_button(vv->vw, mode);
1023 label = gtk_bin_get_child(GTK_BIN(mode_button));
1025 name = gtk_label_get_text ( GTK_LABEL(label) );