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"
34 #include "vikviewport.h"
40 #include "googlemaps.h"
43 static gdouble EASTING_OFFSET = 500000.0;
45 static void viewport_class_init ( VikViewportClass *klass );
46 static void viewport_init ( VikViewport *vvp );
47 static void viewport_finalize ( GObject *gob );
48 static void viewport_utm_zone_check ( VikViewport *vvp );
50 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 );
51 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 );
52 double calcR (double lat);
54 static double Radius[181];
55 static void viewport_init_ra();
57 static GObjectClass *parent_class;
59 static void viewport_google_rezoom ( VikViewport *vvp );
63 GtkDrawingArea drawing_area;
64 GdkPixmap *scr_buffer;
67 VikCoordMode coord_mode;
70 GdkPixbuf *alpha_pixbuf;
71 guint8 alpha_pixbuf_width;
72 guint8 alpha_pixbuf_height;
74 gdouble utm_zone_width;
75 gboolean one_utm_zone;
78 GdkColor background_color;
81 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
82 VikViewportDrawMode drawmode;
84 /* handy conversion factors which make google plotting extremely fast */
85 gdouble google_calcx_fact;
86 gdouble google_calcy_fact;
87 gdouble google_calcx_rev_fact;
88 gdouble google_calcy_rev_fact;
92 viewport_utm_zone_width ( VikViewport *vvp )
94 if ( vvp->coord_mode == VIK_COORD_UTM ) {
97 /* get latitude of screen bottom */
98 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
99 utm.northing -= vvp -> height * vvp -> ympp / 2;
100 a_coords_utm_to_latlon ( &utm, &ll );
103 ll.lon = (utm.zone - 1) * 6 - 180 ;
104 a_coords_latlon_to_utm ( &ll, &utm);
105 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
111 GType vik_viewport_get_type (void)
113 static GType vvp_type = 0;
117 static const GTypeInfo vvp_info =
119 sizeof (VikViewportClass),
120 NULL, /* base_init */
121 NULL, /* base_finalize */
122 (GClassInitFunc) viewport_class_init,
123 NULL, /* class_finalize */
124 NULL, /* class_data */
125 sizeof (VikViewport),
127 (GInstanceInitFunc) viewport_init,
129 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
134 static void viewport_class_init ( VikViewportClass *klass )
137 GObjectClass *object_class;
139 object_class = G_OBJECT_CLASS (klass);
141 object_class->finalize = viewport_finalize;
143 parent_class = g_type_class_peek_parent (klass);
146 VikViewport *vik_viewport_new ()
148 return VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
151 static void viewport_init ( VikViewport *vvp )
155 /* TODO: not static */
158 vvp->coord_mode = VIK_COORD_UTM;
159 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_UTM;
160 vvp->center.north_south = 0;
161 vvp->center.east_west = -166021;
162 vvp->center.utm_zone = 31;
163 vvp->center.utm_letter = 'N';
164 vvp->scr_buffer = NULL;
165 vvp->alpha_pixbuf = NULL;
166 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
167 vvp->utm_zone_width = 0.0;
168 vvp->background_gc = NULL;
169 vvp->draw_scale = TRUE;
170 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
173 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
175 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
176 *rv = vvp->background_color;
180 /* returns pointer to internal static storage, changes next time function called, use quickly */
181 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
183 static gchar color[8];
184 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));
188 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
190 g_assert ( vvp->background_gc );
191 gdk_color_parse ( colorname, &(vvp->background_color) );
192 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
195 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
197 g_assert ( vvp->background_gc );
198 vvp->background_color = *color;
199 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
203 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
208 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
209 gdk_color_parse ( colorname, &color );
210 gdk_gc_set_rgb_fg_color ( rv, &color );
211 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
215 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
219 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
220 gdk_gc_set_rgb_fg_color ( rv, color );
221 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
225 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
228 vvp->height = height;
229 if ( vvp->scr_buffer )
230 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
231 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
235 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
237 return vvp->scr_buffer;
240 gboolean vik_viewport_configure ( VikViewport *vvp )
242 g_return_val_if_fail ( vvp != NULL, TRUE );
244 vvp->width = GTK_WIDGET(vvp)->allocation.width;
245 vvp->height = GTK_WIDGET(vvp)->allocation.height;
247 if ( vvp->scr_buffer )
248 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
250 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
252 /* this is down here so it can get a GC (necessary?) */
253 if ( ! vvp->background_gc )
255 vvp->background_gc = vik_viewport_new_gc ( vvp, "", 1 );
256 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR ); /* set to "backup" color in vvp->background_color */
262 static void viewport_finalize ( GObject *gob )
264 VikViewport *vvp = VIK_VIEWPORT(gob);
266 g_return_if_fail ( vvp != NULL );
268 if ( vvp->scr_buffer )
269 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
271 if ( vvp->alpha_pixbuf )
272 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
274 if ( vvp->background_gc )
275 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
277 G_OBJECT_CLASS(parent_class)->finalize(gob);
280 void vik_viewport_clear ( VikViewport *vvp )
282 g_return_if_fail ( vvp != NULL );
283 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
286 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
288 vvp->draw_scale = draw_scale;
291 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
293 return vvp->draw_scale;
296 void vik_viewport_draw_scale ( VikViewport *vvp )
298 if ( vvp->draw_scale ) {
299 VikCoord left, right;
300 gdouble unit, base, diff, old_unit, old_diff, ratio;
301 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
302 PangoFontDescription *pfd;
306 g_return_if_fail ( vvp != NULL );
308 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
309 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
311 base = vik_coord_diff ( &left, &right ); // in meters
312 ratio = (vvp->width/SCSIZE)/base;
315 diff = fabs(base-unit);
319 while (diff <= old_diff) {
322 unit = unit * (odd%2 ? 5 : 2);
323 diff = fabs(base-unit);
329 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
330 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
331 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
332 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
333 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
334 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
337 for (i=1; i<5; i++) {
338 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
339 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
343 for (i=1; i<10; i++) {
344 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
345 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
348 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
349 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
350 pango_layout_set_font_description (pl, pfd);
351 pango_font_description_free (pfd);
354 sprintf(s, "%d km", (int)unit/1000);
356 sprintf(s, "%d m", (int)unit);
358 pango_layout_set_text(pl, s, -1);
359 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
360 PAD + len + PAD, vvp->height - PAD - 10, pl);
364 void vik_viewport_sync ( VikViewport *vvp )
366 g_return_if_fail ( vvp != NULL );
367 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);
370 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
374 g_return_if_fail ( vvp != NULL );
375 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);
381 x = vvp->width+x_off;
388 y = vvp->height+y_off;
391 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
392 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
395 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
397 g_return_if_fail ( vvp != NULL );
398 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
399 vvp->xmpp = vvp->ympp = xympp;
401 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
402 viewport_utm_zone_check(vvp);
403 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
404 viewport_google_rezoom ( vvp );
407 /* or could do factor */
408 void vik_viewport_zoom_in ( VikViewport *vvp )
410 g_return_if_fail ( vvp != NULL );
411 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
416 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
417 viewport_google_rezoom ( vvp );
419 viewport_utm_zone_check(vvp);
423 void vik_viewport_zoom_out ( VikViewport *vvp )
425 g_return_if_fail ( vvp != NULL );
426 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
431 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
432 viewport_google_rezoom ( vvp );
434 viewport_utm_zone_check(vvp);
438 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
440 if ( vvp->xmpp == vvp->ympp )
445 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
450 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
455 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
457 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
459 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
460 viewport_utm_zone_check(vvp);
461 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
462 viewport_google_rezoom ( vvp );
466 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
468 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
470 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
471 viewport_utm_zone_check(vvp);
472 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
473 viewport_google_rezoom ( vvp );
478 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
480 g_return_val_if_fail ( vvp != NULL, NULL );
481 return &(vvp->center);
484 /* called every time we update coordinates/zoom */
485 static void viewport_utm_zone_check ( VikViewport *vvp )
487 if ( vvp->coord_mode == VIK_COORD_UTM )
491 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
492 a_coords_latlon_to_utm ( &ll, &utm );
493 if ( utm.zone != vvp->center.utm_zone )
494 *((struct UTM *)(&vvp->center)) = utm;
496 /* misc. stuff so we don't have to check later */
497 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
498 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
502 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
504 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
505 if ( vvp->coord_mode == VIK_COORD_UTM )
506 viewport_utm_zone_check ( vvp );
509 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
511 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
512 if ( vvp->coord_mode == VIK_COORD_UTM )
513 viewport_utm_zone_check ( vvp );
516 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
518 vvp->center = *coord;
519 if ( vvp->coord_mode == VIK_COORD_UTM )
520 viewport_utm_zone_check ( vvp );
523 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
525 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
527 /* get center, then just offset */
528 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
529 ul->mode = VIK_COORD_UTM;
532 ul->north_south += (vvp->ympp * vvp->height / 2);
533 ul->east_west -= (vvp->xmpp * vvp->width / 2);
534 br->north_south -= (vvp->ympp * vvp->height / 2);
535 br->east_west += (vvp->xmpp * vvp->width / 2);
538 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
540 if ( vvp->coord_mode == VIK_COORD_UTM ) {
541 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
542 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
547 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
549 if ( vvp->coord_mode == VIK_COORD_UTM ) {
551 g_assert ( vvp != NULL );
552 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
553 return coord.utm_zone;
558 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
560 if ( vvp->coord_mode == VIK_COORD_UTM ) {
562 g_assert ( vvp != NULL );
563 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
564 return coord.utm_zone;
570 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
572 g_return_if_fail ( vvp != NULL );
573 if ( vvp->coord_mode == VIK_COORD_UTM ) {
574 /* slightly optimized */
575 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
576 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
577 viewport_utm_zone_check ( vvp );
580 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
581 vik_viewport_set_center_coord ( vvp, &tmp );
585 gint vik_viewport_get_width( VikViewport *vvp )
587 g_return_val_if_fail ( vvp != NULL, 0 );
591 gint vik_viewport_get_height( VikViewport *vvp )
593 g_return_val_if_fail ( vvp != NULL, 0 );
597 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
599 if ( vvp->coord_mode == VIK_COORD_UTM ) {
601 struct UTM *utm = (struct UTM *) coord;
602 coord->mode = VIK_COORD_UTM;
604 g_return_if_fail ( vvp != NULL );
606 utm->zone = vvp->center.utm_zone;
607 utm->letter = vvp->center.utm_letter;
608 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
609 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
610 utm->zone += zone_delta;
611 utm->easting -= zone_delta * vvp->utm_zone_width;
612 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
613 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
614 coord->mode = VIK_COORD_LATLON;
615 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
616 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);
617 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
619 coord->east_west = (x - (vvp->width/2)) * vvp->google_calcx_rev_fact + vvp->center.east_west;
620 coord->north_south = ((vvp->height/2) - y) * vvp->google_calcy_rev_fact + vvp->center.north_south;
621 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
622 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
623 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
624 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
626 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
627 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
630 --> THIS IS JUNK HERE.
631 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
633 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
634 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
640 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
643 g_return_if_fail ( vvp != NULL );
645 if ( coord->mode != vvp->coord_mode )
647 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
648 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
652 if ( vvp->coord_mode == VIK_COORD_UTM ) {
653 struct UTM *center = (struct UTM *) &(vvp->center);
654 struct UTM *utm = (struct UTM *) coord;
655 if ( center->zone != utm->zone && vvp->one_utm_zone )
657 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
661 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
662 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
663 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
664 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
665 struct LatLon *center = (struct LatLon *) &(vvp->center);
666 struct LatLon *ll = (struct LatLon *) coord;
668 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
669 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 );
671 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
673 *x = vvp->google_calcx_fact * (ll->lon - center->lon) + (vvp->width/2);
674 *y = vvp->google_calcy_fact * (center->lat - ll->lat) + (vvp->height/2);
675 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
676 /* subtract, convert to KH coords; blow it up by 256 */
677 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
678 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
679 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
680 /* FIXMERCATOR: Optimize */
681 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
682 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
687 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
689 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
690 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) )
691 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
694 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
696 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
697 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
700 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
702 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
703 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
706 /* shouldn't use this -- slow -- change the alpha channel instead. */
707 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
708 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
710 gint real_dest_x = MAX(dest_x,0);
711 gint real_dest_y = MAX(dest_y,0);
714 return; /* don't waste your time */
716 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
718 if ( vvp->alpha_pixbuf )
719 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
720 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
721 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
722 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
725 w = MIN(w,vvp->width - dest_x);
726 h = MIN(h,vvp->height - dest_y);
728 /* check that we are drawing within boundaries. */
729 src_x += (real_dest_x - dest_x);
730 src_y += (real_dest_y - dest_y);
731 w -= (real_dest_x - dest_x);
732 h -= (real_dest_y - dest_y);
734 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
735 real_dest_x, real_dest_y, 0, 0, w, h );
738 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
740 /* draw pixbuf_tmp */
741 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
744 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
745 gint dest_x, gint dest_y, gint w, gint h )
747 gdk_draw_pixbuf ( vvp->scr_buffer,
748 // GTK_WIDGET(vvp)->style->black_gc,
751 src_x, src_y, dest_x, dest_y, w, h,
752 GDK_RGB_DITHER_NONE, 0, 0 );
755 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
757 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
761 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
763 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
766 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
769 return vvp->coord_mode;
772 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
774 g_return_if_fail ( vvp != NULL );
775 vvp->coord_mode = mode;
776 vik_coord_convert ( &(vvp->center), mode );
779 /* Thanks GPSDrive */
780 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 )
783 gdouble dif, lat, lon;
784 double Ra = Radius[90+(gint)zero_lat];
786 px = (mapSizeX2 - x) * pixelfact_x;
787 py = (-mapSizeY2 + y) * pixelfact_y;
789 lat = zero_lat - py / Ra;
790 lat = zero_lat - py / Ra;
794 cos (lat * DEG2RAD));
796 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
797 lat = lat - dif / 1.5;
801 cos (lat * DEG2RAD));
808 /* Thanks GPSDrive */
809 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 )
813 gint mapSizeX = 2 * mapSizeX2;
814 gint mapSizeY = 2 * mapSizeY2;
816 g_assert ( lt >= -90.0 && lt <= 90.0 );
817 // lg *= rad2deg; // FIXME, optimize equations
819 Ra = Radius[90+(gint)lt];
821 cos (lt*DEG2RAD) * (lg - zero_long);
822 *y = Ra * (lt - zero_lat);
823 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
824 *y = *y + dif / 1.85;
825 *x = *x / pixelfact_x;
826 *y = *y / pixelfact_y;
829 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
834 static void viewport_init_ra()
836 static gboolean done_before = FALSE;
840 for ( i = -90; i <= 90; i++)
841 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
846 double calcR (double lat)
848 double a = 6378.137, r, sc, x, y, z;
849 double e2 = 0.081082 * 0.081082;
851 * the radius of curvature of an ellipsoidal Earth in the plane of the
852 * meridian is given by
854 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
857 * where a is the equatorial radius, b is the polar radius, and e is
858 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
860 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
861 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
862 * = 0.081082 Eccentricity
868 z = 1.0 - e2 * sc * sc;
875 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
877 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
880 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
882 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
883 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
886 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
888 static GdkGCValues values;
889 gdk_gc_get_values ( gc, &values );
890 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
893 GdkFunction vik_gc_get_function ( GdkGC *gc )
895 static GdkGCValues values;
896 gdk_gc_get_values ( gc, &values );
897 return values.function;
900 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
902 vvp->drawmode = drawmode;
903 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
904 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
906 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
907 if ( drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
908 viewport_google_rezoom ( vvp );
912 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
914 return vvp->drawmode;
917 static void viewport_google_rezoom ( VikViewport *vvp )
919 vvp->google_calcx_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 * 0.7716245833877 / vvp->xmpp);
920 vvp->google_calcy_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 / vvp->ympp);
921 vvp->google_calcx_rev_fact = 1 / vvp->google_calcx_fact;
922 vvp->google_calcy_rev_fact = 1 / vvp->google_calcy_fact;