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 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
86 VikViewportDrawMode drawmode;
88 /* handy conversion factors which make google plotting extremely fast */
89 gdouble google_calcx_fact;
90 gdouble google_calcy_fact;
91 gdouble google_calcx_rev_fact;
92 gdouble google_calcy_rev_fact;
96 viewport_utm_zone_width ( VikViewport *vvp )
98 if ( vvp->coord_mode == VIK_COORD_UTM ) {
101 /* get latitude of screen bottom */
102 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
103 utm.northing -= vvp -> height * vvp -> ympp / 2;
104 a_coords_utm_to_latlon ( &utm, &ll );
107 ll.lon = (utm.zone - 1) * 6 - 180 ;
108 a_coords_latlon_to_utm ( &ll, &utm);
109 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
115 GType vik_viewport_get_type (void)
117 static GType vvp_type = 0;
121 static const GTypeInfo vvp_info =
123 sizeof (VikViewportClass),
124 NULL, /* base_init */
125 NULL, /* base_finalize */
126 (GClassInitFunc) viewport_class_init,
127 NULL, /* class_finalize */
128 NULL, /* class_data */
129 sizeof (VikViewport),
131 (GInstanceInitFunc) viewport_init,
133 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
138 static void viewport_class_init ( VikViewportClass *klass )
141 GObjectClass *object_class;
143 object_class = G_OBJECT_CLASS (klass);
145 object_class->finalize = viewport_finalize;
147 parent_class = g_type_class_peek_parent (klass);
150 VikViewport *vik_viewport_new ()
152 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
156 static void viewport_init ( VikViewport *vvp )
160 /* TODO: not static */
163 vvp->coord_mode = VIK_COORD_LATLON;
164 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
165 vvp->center.north_south = 40.714490;
166 vvp->center.east_west = -74.007130;
167 vvp->center.utm_zone = 31;
168 vvp->center.utm_letter = 'N';
169 vvp->scr_buffer = NULL;
170 vvp->alpha_pixbuf = NULL;
171 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
172 vvp->utm_zone_width = 0.0;
173 vvp->background_gc = NULL;
174 vvp->scale_bg_gc = NULL;
175 vvp->draw_scale = TRUE;
176 vvp->draw_centermark = TRUE;
177 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
180 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
182 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
183 *rv = vvp->background_color;
187 /* returns pointer to internal static storage, changes next time function called, use quickly */
188 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
190 static gchar color[8];
191 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));
195 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
197 g_assert ( vvp->background_gc );
198 gdk_color_parse ( colorname, &(vvp->background_color) );
199 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
202 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
204 g_assert ( vvp->background_gc );
205 vvp->background_color = *color;
206 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
210 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
215 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
216 gdk_color_parse ( colorname, &color );
217 gdk_gc_set_rgb_fg_color ( rv, &color );
218 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
222 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
226 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
227 gdk_gc_set_rgb_fg_color ( rv, color );
228 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
232 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
235 vvp->height = height;
236 if ( vvp->scr_buffer )
237 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
238 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
242 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
244 return vvp->scr_buffer;
247 gboolean vik_viewport_configure ( VikViewport *vvp )
249 g_return_val_if_fail ( vvp != NULL, TRUE );
251 vvp->width = GTK_WIDGET(vvp)->allocation.width;
252 vvp->height = GTK_WIDGET(vvp)->allocation.height;
254 if ( vvp->scr_buffer )
255 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
257 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
259 /* this is down here so it can get a GC (necessary?) */
260 if ( ! vvp->background_gc )
262 vvp->background_gc = vik_viewport_new_gc ( vvp, "", 1 );
263 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR ); /* set to "backup" color in vvp->background_color */
265 if ( !vvp->scale_bg_gc) {
266 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
272 static void viewport_finalize ( GObject *gob )
274 VikViewport *vvp = VIK_VIEWPORT(gob);
276 g_return_if_fail ( vvp != NULL );
278 if ( vvp->scr_buffer )
279 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
281 if ( vvp->alpha_pixbuf )
282 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
284 if ( vvp->background_gc )
285 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
287 if ( vvp->scale_bg_gc ) {
288 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
289 vvp->scale_bg_gc = NULL;
292 G_OBJECT_CLASS(parent_class)->finalize(gob);
295 void vik_viewport_clear ( VikViewport *vvp )
297 g_return_if_fail ( vvp != NULL );
298 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
301 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
303 vvp->draw_scale = draw_scale;
306 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
308 return vvp->draw_scale;
311 void vik_viewport_draw_scale ( VikViewport *vvp )
313 if ( vvp->draw_scale ) {
314 VikCoord left, right;
315 gdouble unit, base, diff, old_unit, old_diff, ratio;
316 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
317 PangoFontDescription *pfd;
321 g_return_if_fail ( vvp != NULL );
323 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
324 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
326 base = vik_coord_diff ( &left, &right ); // in meters
327 ratio = (vvp->width/SCSIZE)/base;
330 diff = fabs(base-unit);
334 while (diff <= old_diff) {
337 unit = unit * (odd%2 ? 5 : 2);
338 diff = fabs(base-unit);
344 /* white background */
345 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
346 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
347 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
348 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
349 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
350 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
352 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
353 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
354 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
355 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
356 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
357 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
360 for (i=1; i<5; i++) {
361 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
362 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
363 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
364 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
368 for (i=1; i<10; i++) {
369 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
370 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
371 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
372 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
375 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
376 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
377 pango_layout_set_font_description (pl, pfd);
378 pango_font_description_free (pfd);
381 sprintf(s, "%d km", (int)unit/1000);
383 sprintf(s, "%d m", (int)unit);
385 pango_layout_set_text(pl, s, -1);
386 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
387 PAD + len + PAD, vvp->height - PAD - 10, pl);
391 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
393 vvp->draw_centermark = draw_centermark;
396 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
398 return vvp->draw_centermark;
401 void vik_viewport_draw_centermark ( VikViewport *vvp )
403 if ( !vvp->draw_centermark )
408 int center_x = vvp->width/2;
409 int center_y = vvp->height/2;
410 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
412 /* white back ground */
413 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
414 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
415 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
416 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
417 /* black fore ground */
418 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
419 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
420 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
421 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
425 void vik_viewport_sync ( VikViewport *vvp )
427 g_return_if_fail ( vvp != NULL );
428 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);
431 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
435 g_return_if_fail ( vvp != NULL );
436 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);
442 x = vvp->width+x_off;
449 y = vvp->height+y_off;
452 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
453 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
456 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
458 g_return_if_fail ( vvp != NULL );
459 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
460 vvp->xmpp = vvp->ympp = xympp;
462 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
463 viewport_utm_zone_check(vvp);
464 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
465 viewport_google_rezoom ( vvp );
468 /* or could do factor */
469 void vik_viewport_zoom_in ( VikViewport *vvp )
471 g_return_if_fail ( vvp != NULL );
472 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
477 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
478 viewport_google_rezoom ( vvp );
480 viewport_utm_zone_check(vvp);
484 void vik_viewport_zoom_out ( VikViewport *vvp )
486 g_return_if_fail ( vvp != NULL );
487 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
492 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
493 viewport_google_rezoom ( vvp );
495 viewport_utm_zone_check(vvp);
499 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
501 if ( vvp->xmpp == vvp->ympp )
506 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
511 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
516 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
518 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
520 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
521 viewport_utm_zone_check(vvp);
522 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
523 viewport_google_rezoom ( vvp );
527 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
529 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
531 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
532 viewport_utm_zone_check(vvp);
533 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
534 viewport_google_rezoom ( vvp );
539 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
541 g_return_val_if_fail ( vvp != NULL, NULL );
542 return &(vvp->center);
545 /* called every time we update coordinates/zoom */
546 static void viewport_utm_zone_check ( VikViewport *vvp )
548 if ( vvp->coord_mode == VIK_COORD_UTM )
552 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
553 a_coords_latlon_to_utm ( &ll, &utm );
554 if ( utm.zone != vvp->center.utm_zone )
555 *((struct UTM *)(&vvp->center)) = utm;
557 /* misc. stuff so we don't have to check later */
558 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
559 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
563 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
565 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
566 if ( vvp->coord_mode == VIK_COORD_UTM )
567 viewport_utm_zone_check ( vvp );
570 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
572 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
573 if ( vvp->coord_mode == VIK_COORD_UTM )
574 viewport_utm_zone_check ( vvp );
577 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
579 vvp->center = *coord;
580 if ( vvp->coord_mode == VIK_COORD_UTM )
581 viewport_utm_zone_check ( vvp );
584 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
586 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
588 /* get center, then just offset */
589 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
590 ul->mode = VIK_COORD_UTM;
593 ul->north_south += (vvp->ympp * vvp->height / 2);
594 ul->east_west -= (vvp->xmpp * vvp->width / 2);
595 br->north_south -= (vvp->ympp * vvp->height / 2);
596 br->east_west += (vvp->xmpp * vvp->width / 2);
599 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
601 if ( vvp->coord_mode == VIK_COORD_UTM ) {
602 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
603 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
608 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
610 if ( vvp->coord_mode == VIK_COORD_UTM ) {
612 g_assert ( vvp != NULL );
613 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
614 return coord.utm_zone;
619 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
621 if ( vvp->coord_mode == VIK_COORD_UTM ) {
623 g_assert ( vvp != NULL );
624 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
625 return coord.utm_zone;
631 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
633 g_return_if_fail ( vvp != NULL );
634 if ( vvp->coord_mode == VIK_COORD_UTM ) {
635 /* slightly optimized */
636 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
637 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
638 viewport_utm_zone_check ( vvp );
641 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
642 vik_viewport_set_center_coord ( vvp, &tmp );
646 gint vik_viewport_get_width( VikViewport *vvp )
648 g_return_val_if_fail ( vvp != NULL, 0 );
652 gint vik_viewport_get_height( VikViewport *vvp )
654 g_return_val_if_fail ( vvp != NULL, 0 );
658 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
660 if ( vvp->coord_mode == VIK_COORD_UTM ) {
662 struct UTM *utm = (struct UTM *) coord;
663 coord->mode = VIK_COORD_UTM;
665 g_return_if_fail ( vvp != NULL );
667 utm->zone = vvp->center.utm_zone;
668 utm->letter = vvp->center.utm_letter;
669 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
670 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
671 utm->zone += zone_delta;
672 utm->easting -= zone_delta * vvp->utm_zone_width;
673 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
674 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
675 coord->mode = VIK_COORD_LATLON;
676 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
677 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);
678 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
680 coord->east_west = (x - (vvp->width/2)) * vvp->google_calcx_rev_fact + vvp->center.east_west;
681 coord->north_south = ((vvp->height/2) - y) * vvp->google_calcy_rev_fact + vvp->center.north_south;
682 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
683 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
684 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
685 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
687 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
688 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
691 --> THIS IS JUNK HERE.
692 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
694 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
695 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
701 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
704 g_return_if_fail ( vvp != NULL );
706 if ( coord->mode != vvp->coord_mode )
708 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
709 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
713 if ( vvp->coord_mode == VIK_COORD_UTM ) {
714 struct UTM *center = (struct UTM *) &(vvp->center);
715 struct UTM *utm = (struct UTM *) coord;
716 if ( center->zone != utm->zone && vvp->one_utm_zone )
718 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
722 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
723 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
724 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
725 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
726 struct LatLon *center = (struct LatLon *) &(vvp->center);
727 struct LatLon *ll = (struct LatLon *) coord;
729 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
730 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 );
732 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
734 *x = vvp->google_calcx_fact * (ll->lon - center->lon) + (vvp->width/2);
735 *y = vvp->google_calcy_fact * (center->lat - ll->lat) + (vvp->height/2);
736 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
737 /* subtract, convert to KH coords; blow it up by 256 */
738 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
739 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
740 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
741 /* FIXMERCATOR: Optimize */
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 * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
748 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
750 if ( *x1 > 20000 || *x1 < -20000 ) {
751 gdouble shrinkfactor = ABS(20000.0 / *x1);
752 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
753 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
754 } else if ( *y1 > 20000 || *y1 < -20000 ) {
755 gdouble shrinkfactor = ABS(20000.0 / *x1);
756 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
757 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
758 } else if ( *x2 > 20000 || *x2 < -20000 ) {
759 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
760 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
761 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
762 g_print("%f, %d, %d\n", shrinkfactor, *x2, *y2);
763 } else if ( *y2 > 20000 || *y2 < -20000 ) {
764 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
765 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
766 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
770 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
772 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
773 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
774 /*** clipping, yeah! ***/
775 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
776 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
780 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
782 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
783 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
786 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
788 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
789 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
792 /* shouldn't use this -- slow -- change the alpha channel instead. */
793 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
794 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
796 gint real_dest_x = MAX(dest_x,0);
797 gint real_dest_y = MAX(dest_y,0);
800 return; /* don't waste your time */
802 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
804 if ( vvp->alpha_pixbuf )
805 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
806 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
807 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
808 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
811 w = MIN(w,vvp->width - dest_x);
812 h = MIN(h,vvp->height - dest_y);
814 /* check that we are drawing within boundaries. */
815 src_x += (real_dest_x - dest_x);
816 src_y += (real_dest_y - dest_y);
817 w -= (real_dest_x - dest_x);
818 h -= (real_dest_y - dest_y);
820 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
821 real_dest_x, real_dest_y, 0, 0, w, h );
824 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
826 /* draw pixbuf_tmp */
827 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
830 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
831 gint dest_x, gint dest_y, gint w, gint h )
833 gdk_draw_pixbuf ( vvp->scr_buffer,
834 // GTK_WIDGET(vvp)->style->black_gc,
837 src_x, src_y, dest_x, dest_y, w, h,
838 GDK_RGB_DITHER_NONE, 0, 0 );
841 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
843 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
847 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
849 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
852 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
855 return vvp->coord_mode;
858 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
860 g_return_if_fail ( vvp != NULL );
861 vvp->coord_mode = mode;
862 vik_coord_convert ( &(vvp->center), mode );
865 /* Thanks GPSDrive */
866 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 )
869 gdouble dif, lat, lon;
870 double Ra = Radius[90+(gint)zero_lat];
872 px = (mapSizeX2 - x) * pixelfact_x;
873 py = (-mapSizeY2 + y) * pixelfact_y;
875 lat = zero_lat - py / Ra;
876 lat = zero_lat - py / Ra;
880 cos (lat * DEG2RAD));
882 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
883 lat = lat - dif / 1.5;
887 cos (lat * DEG2RAD));
894 /* Thanks GPSDrive */
895 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 )
899 gint mapSizeX = 2 * mapSizeX2;
900 gint mapSizeY = 2 * mapSizeY2;
902 g_assert ( lt >= -90.0 && lt <= 90.0 );
903 // lg *= rad2deg; // FIXME, optimize equations
905 Ra = Radius[90+(gint)lt];
907 cos (lt*DEG2RAD) * (lg - zero_long);
908 *y = Ra * (lt - zero_lat);
909 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
910 *y = *y + dif / 1.85;
911 *x = *x / pixelfact_x;
912 *y = *y / pixelfact_y;
915 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
920 static void viewport_init_ra()
922 static gboolean done_before = FALSE;
926 for ( i = -90; i <= 90; i++)
927 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
932 double calcR (double lat)
934 double a = 6378.137, r, sc, x, y, z;
935 double e2 = 0.081082 * 0.081082;
937 * the radius of curvature of an ellipsoidal Earth in the plane of the
938 * meridian is given by
940 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
943 * where a is the equatorial radius, b is the polar radius, and e is
944 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
946 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
947 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
948 * = 0.081082 Eccentricity
954 z = 1.0 - e2 * sc * sc;
961 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
963 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
966 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
968 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
969 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
972 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
974 static GdkGCValues values;
975 gdk_gc_get_values ( gc, &values );
976 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
979 GdkFunction vik_gc_get_function ( GdkGC *gc )
981 static GdkGCValues values;
982 gdk_gc_get_values ( gc, &values );
983 return values.function;
986 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
988 vvp->drawmode = drawmode;
989 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
990 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
992 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
993 if ( drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
994 viewport_google_rezoom ( vvp );
998 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1000 return vvp->drawmode;
1003 static void viewport_google_rezoom ( VikViewport *vvp )
1005 vvp->google_calcx_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 * 0.7716245833877 / vvp->xmpp);
1006 vvp->google_calcy_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 / vvp->ympp);
1007 vvp->google_calcx_rev_fact = 1 / vvp->google_calcx_fact;
1008 vvp->google_calcy_rev_fact = 1 / vvp->google_calcy_fact;
1012 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1014 const gchar *name = NULL;
1015 VikWindow *vw = NULL;
1016 GtkWidget *mode_button;
1019 vw = VIK_WINDOW_FROM_WIDGET(vv);
1020 mode_button = vik_window_get_drawmode_button(vw, mode);
1021 label = gtk_bin_get_child(GTK_BIN(mode_button));
1023 name = gtk_label_get_text ( GTK_LABEL(label) );