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 GdkPixmap *snapshot_buffer;
101 viewport_utm_zone_width ( VikViewport *vvp )
103 if ( vvp->coord_mode == VIK_COORD_UTM ) {
106 /* get latitude of screen bottom */
107 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
108 utm.northing -= vvp -> height * vvp -> ympp / 2;
109 a_coords_utm_to_latlon ( &utm, &ll );
112 ll.lon = (utm.zone - 1) * 6 - 180 ;
113 a_coords_latlon_to_utm ( &ll, &utm);
114 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
120 GType vik_viewport_get_type (void)
122 static GType vvp_type = 0;
126 static const GTypeInfo vvp_info =
128 sizeof (VikViewportClass),
129 NULL, /* base_init */
130 NULL, /* base_finalize */
131 (GClassInitFunc) viewport_class_init,
132 NULL, /* class_finalize */
133 NULL, /* class_data */
134 sizeof (VikViewport),
136 (GInstanceInitFunc) viewport_init,
138 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
143 static void viewport_class_init ( VikViewportClass *klass )
146 GObjectClass *object_class;
148 object_class = G_OBJECT_CLASS (klass);
150 object_class->finalize = viewport_finalize;
152 parent_class = g_type_class_peek_parent (klass);
155 VikViewport *vik_viewport_new ()
157 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
161 static void viewport_init ( VikViewport *vvp )
165 /* TODO: not static */
168 vvp->coord_mode = VIK_COORD_LATLON;
169 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
170 vvp->center.mode = VIK_COORD_LATLON;
171 vvp->center.north_south = 40.714490;
172 vvp->center.east_west = -74.007130;
173 vvp->center.utm_zone = 31;
174 vvp->center.utm_letter = 'N';
175 vvp->scr_buffer = NULL;
176 vvp->alpha_pixbuf = NULL;
177 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
178 vvp->utm_zone_width = 0.0;
179 vvp->background_gc = NULL;
180 vvp->scale_bg_gc = NULL;
181 vvp->draw_scale = TRUE;
182 vvp->draw_centermark = TRUE;
185 vvp->snapshot_buffer = NULL;
186 vvp->half_drawn = FALSE;
188 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
190 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
193 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
195 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
196 *rv = vvp->background_color;
200 /* returns pointer to internal static storage, changes next time function called, use quickly */
201 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
203 static gchar color[8];
204 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));
208 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
210 g_assert ( vvp->background_gc );
211 gdk_color_parse ( colorname, &(vvp->background_color) );
212 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
215 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
217 g_assert ( vvp->background_gc );
218 vvp->background_color = *color;
219 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
223 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
228 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
229 gdk_color_parse ( colorname, &color );
230 gdk_gc_set_rgb_fg_color ( rv, &color );
231 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
235 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
239 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
240 gdk_gc_set_rgb_fg_color ( rv, color );
241 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
245 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
248 vvp->height = height;
249 if ( vvp->scr_buffer )
250 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
251 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
253 /* TODO trigger: only if this is enabled !!! */
254 if ( vvp->snapshot_buffer )
255 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
256 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
260 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
262 return vvp->scr_buffer;
265 gboolean vik_viewport_configure ( VikViewport *vvp )
267 g_return_val_if_fail ( vvp != NULL, TRUE );
269 vvp->width = GTK_WIDGET(vvp)->allocation.width;
270 vvp->height = GTK_WIDGET(vvp)->allocation.height;
272 if ( vvp->scr_buffer )
273 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
275 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
277 /* TODO trigger: only if enabled! */
278 if ( vvp->snapshot_buffer )
279 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
281 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
284 /* this is down here so it can get a GC (necessary?) */
285 if ( ! vvp->background_gc )
287 vvp->background_gc = vik_viewport_new_gc ( vvp, "", 1 );
288 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR ); /* set to "backup" color in vvp->background_color */
290 if ( !vvp->scale_bg_gc) {
291 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
297 static void viewport_finalize ( GObject *gob )
299 VikViewport *vvp = VIK_VIEWPORT(gob);
301 g_return_if_fail ( vvp != NULL );
303 if ( vvp->scr_buffer )
304 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
306 if ( vvp->snapshot_buffer )
307 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
309 if ( vvp->alpha_pixbuf )
310 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
312 if ( vvp->background_gc )
313 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
315 if ( vvp->scale_bg_gc ) {
316 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
317 vvp->scale_bg_gc = NULL;
320 G_OBJECT_CLASS(parent_class)->finalize(gob);
323 void vik_viewport_clear ( VikViewport *vvp )
325 g_return_if_fail ( vvp != NULL );
326 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
329 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
331 vvp->draw_scale = draw_scale;
334 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
336 return vvp->draw_scale;
339 void vik_viewport_draw_scale ( VikViewport *vvp )
341 if ( vvp->draw_scale ) {
342 VikCoord left, right;
343 gdouble unit, base, diff, old_unit, old_diff, ratio;
344 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
345 PangoFontDescription *pfd;
349 g_return_if_fail ( vvp != NULL );
351 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
352 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
354 base = vik_coord_diff ( &left, &right ); // in meters
355 ratio = (vvp->width/SCSIZE)/base;
358 diff = fabs(base-unit);
362 while (diff <= old_diff) {
365 unit = unit * (odd%2 ? 5 : 2);
366 diff = fabs(base-unit);
372 /* white background */
373 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
374 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
375 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
376 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
377 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
378 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
380 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
381 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
382 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
383 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
384 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
385 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
388 for (i=1; i<5; i++) {
389 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
390 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
391 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
392 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
396 for (i=1; i<10; i++) {
397 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
398 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
399 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
400 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
403 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
404 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
405 pango_layout_set_font_description (pl, pfd);
406 pango_font_description_free (pfd);
409 sprintf(s, "%d km", (int)unit/1000);
411 sprintf(s, "%d m", (int)unit);
413 pango_layout_set_text(pl, s, -1);
414 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
415 PAD + len + PAD, vvp->height - PAD - 10, pl);
419 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
421 vvp->draw_centermark = draw_centermark;
424 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
426 return vvp->draw_centermark;
429 void vik_viewport_draw_centermark ( VikViewport *vvp )
431 if ( !vvp->draw_centermark )
436 int center_x = vvp->width/2;
437 int center_y = vvp->height/2;
438 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
440 /* white back ground */
441 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
442 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
443 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
444 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
445 /* black fore ground */
446 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
447 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
448 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
449 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
453 void vik_viewport_sync ( VikViewport *vvp )
455 g_return_if_fail ( vvp != NULL );
456 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);
459 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
463 g_return_if_fail ( vvp != NULL );
464 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);
470 x = vvp->width+x_off;
477 y = vvp->height+y_off;
480 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
481 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
484 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
486 g_return_if_fail ( vvp != NULL );
487 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
488 vvp->xmpp = vvp->ympp = xympp;
490 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
491 viewport_utm_zone_check(vvp);
492 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
493 viewport_google_rezoom ( vvp );
496 /* or could do factor */
497 void vik_viewport_zoom_in ( VikViewport *vvp )
499 g_return_if_fail ( vvp != NULL );
500 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
505 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
506 viewport_google_rezoom ( vvp );
508 viewport_utm_zone_check(vvp);
512 void vik_viewport_zoom_out ( VikViewport *vvp )
514 g_return_if_fail ( vvp != NULL );
515 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
520 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
521 viewport_google_rezoom ( vvp );
523 viewport_utm_zone_check(vvp);
527 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
529 if ( vvp->xmpp == vvp->ympp )
534 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
539 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
544 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
546 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
548 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
549 viewport_utm_zone_check(vvp);
550 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
551 viewport_google_rezoom ( vvp );
555 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
557 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
559 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
560 viewport_utm_zone_check(vvp);
561 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
562 viewport_google_rezoom ( vvp );
567 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
569 g_return_val_if_fail ( vvp != NULL, NULL );
570 return &(vvp->center);
573 /* called every time we update coordinates/zoom */
574 static void viewport_utm_zone_check ( VikViewport *vvp )
576 if ( vvp->coord_mode == VIK_COORD_UTM )
580 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
581 a_coords_latlon_to_utm ( &ll, &utm );
582 if ( utm.zone != vvp->center.utm_zone )
583 *((struct UTM *)(&vvp->center)) = utm;
585 /* misc. stuff so we don't have to check later */
586 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
587 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
591 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
593 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
594 if ( vvp->coord_mode == VIK_COORD_UTM )
595 viewport_utm_zone_check ( vvp );
598 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
600 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
601 if ( vvp->coord_mode == VIK_COORD_UTM )
602 viewport_utm_zone_check ( vvp );
605 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
607 vvp->center = *coord;
608 if ( vvp->coord_mode == VIK_COORD_UTM )
609 viewport_utm_zone_check ( vvp );
612 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
614 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
616 /* get center, then just offset */
617 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
618 ul->mode = VIK_COORD_UTM;
621 ul->north_south += (vvp->ympp * vvp->height / 2);
622 ul->east_west -= (vvp->xmpp * vvp->width / 2);
623 br->north_south -= (vvp->ympp * vvp->height / 2);
624 br->east_west += (vvp->xmpp * vvp->width / 2);
627 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
629 if ( vvp->coord_mode == VIK_COORD_UTM ) {
630 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
631 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
636 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
638 if ( vvp->coord_mode == VIK_COORD_UTM ) {
640 g_assert ( vvp != NULL );
641 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
642 return coord.utm_zone;
647 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
649 if ( vvp->coord_mode == VIK_COORD_UTM ) {
651 g_assert ( vvp != NULL );
652 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
653 return coord.utm_zone;
659 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
661 g_return_if_fail ( vvp != NULL );
662 if ( vvp->coord_mode == VIK_COORD_UTM ) {
663 /* slightly optimized */
664 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
665 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
666 viewport_utm_zone_check ( vvp );
669 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
670 vik_viewport_set_center_coord ( vvp, &tmp );
674 gint vik_viewport_get_width( VikViewport *vvp )
676 g_return_val_if_fail ( vvp != NULL, 0 );
680 gint vik_viewport_get_height( VikViewport *vvp )
682 g_return_val_if_fail ( vvp != NULL, 0 );
686 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
688 if ( vvp->coord_mode == VIK_COORD_UTM ) {
690 struct UTM *utm = (struct UTM *) coord;
691 coord->mode = VIK_COORD_UTM;
693 g_return_if_fail ( vvp != NULL );
695 utm->zone = vvp->center.utm_zone;
696 utm->letter = vvp->center.utm_letter;
697 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
698 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
699 utm->zone += zone_delta;
700 utm->easting -= zone_delta * vvp->utm_zone_width;
701 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
702 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
703 coord->mode = VIK_COORD_LATLON;
704 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
705 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);
706 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
708 coord->east_west = (x - (vvp->width/2)) * vvp->google_calcx_rev_fact + vvp->center.east_west;
709 coord->north_south = ((vvp->height/2) - y) * vvp->google_calcy_rev_fact + vvp->center.north_south;
710 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
711 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
712 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
713 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
715 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
716 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
719 --> THIS IS JUNK HERE.
720 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
722 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
723 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
729 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
732 g_return_if_fail ( vvp != NULL );
734 if ( coord->mode != vvp->coord_mode )
736 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
737 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
741 if ( vvp->coord_mode == VIK_COORD_UTM ) {
742 struct UTM *center = (struct UTM *) &(vvp->center);
743 struct UTM *utm = (struct UTM *) coord;
744 if ( center->zone != utm->zone && vvp->one_utm_zone )
746 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
750 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
751 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
752 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
753 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
754 struct LatLon *center = (struct LatLon *) &(vvp->center);
755 struct LatLon *ll = (struct LatLon *) coord;
757 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
758 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 );
760 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) {
762 *x = vvp->google_calcx_fact * (ll->lon - center->lon) + (vvp->width/2);
763 *y = vvp->google_calcy_fact * (center->lat - ll->lat) + (vvp->height/2);
764 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) {
765 /* subtract, convert to KH coords; blow it up by 256 */
766 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
767 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
768 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
769 /* FIXMERCATOR: Optimize */
770 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
771 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
776 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
778 if ( *x1 > 20000 || *x1 < -20000 ) {
779 gdouble shrinkfactor = ABS(20000.0 / *x1);
780 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
781 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
782 } else if ( *y1 > 20000 || *y1 < -20000 ) {
783 gdouble shrinkfactor = ABS(20000.0 / *x1);
784 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
785 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
786 } else if ( *x2 > 20000 || *x2 < -20000 ) {
787 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
788 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
789 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
790 g_print("%f, %d, %d\n", shrinkfactor, *x2, *y2);
791 } else if ( *y2 > 20000 || *y2 < -20000 ) {
792 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
793 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
794 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
798 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
800 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
801 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
802 /*** clipping, yeah! ***/
803 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
804 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
808 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
810 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
811 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
814 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
816 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
817 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
820 /* shouldn't use this -- slow -- change the alpha channel instead. */
821 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
822 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
824 gint real_dest_x = MAX(dest_x,0);
825 gint real_dest_y = MAX(dest_y,0);
828 return; /* don't waste your time */
830 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
832 if ( vvp->alpha_pixbuf )
833 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
834 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
835 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
836 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
839 w = MIN(w,vvp->width - dest_x);
840 h = MIN(h,vvp->height - dest_y);
842 /* check that we are drawing within boundaries. */
843 src_x += (real_dest_x - dest_x);
844 src_y += (real_dest_y - dest_y);
845 w -= (real_dest_x - dest_x);
846 h -= (real_dest_y - dest_y);
848 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
849 real_dest_x, real_dest_y, 0, 0, w, h );
852 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
854 /* draw pixbuf_tmp */
855 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
858 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
859 gint dest_x, gint dest_y, gint w, gint h )
861 gdk_draw_pixbuf ( vvp->scr_buffer,
862 // GTK_WIDGET(vvp)->style->black_gc,
865 src_x, src_y, dest_x, dest_y, w, h,
866 GDK_RGB_DITHER_NONE, 0, 0 );
869 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
871 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
875 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
877 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
880 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
883 return vvp->coord_mode;
886 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
888 g_return_if_fail ( vvp != NULL );
889 vvp->coord_mode = mode;
890 vik_coord_convert ( &(vvp->center), mode );
893 /* Thanks GPSDrive */
894 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 )
897 gdouble dif, lat, lon;
898 double Ra = Radius[90+(gint)zero_lat];
900 px = (mapSizeX2 - x) * pixelfact_x;
901 py = (-mapSizeY2 + y) * pixelfact_y;
903 lat = zero_lat - py / Ra;
904 lat = zero_lat - py / Ra;
908 cos (lat * DEG2RAD));
910 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
911 lat = lat - dif / 1.5;
915 cos (lat * DEG2RAD));
922 /* Thanks GPSDrive */
923 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 )
927 gint mapSizeX = 2 * mapSizeX2;
928 gint mapSizeY = 2 * mapSizeY2;
930 g_assert ( lt >= -90.0 && lt <= 90.0 );
931 // lg *= rad2deg; // FIXME, optimize equations
933 Ra = Radius[90+(gint)lt];
935 cos (lt*DEG2RAD) * (lg - zero_long);
936 *y = Ra * (lt - zero_lat);
937 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
938 *y = *y + dif / 1.85;
939 *x = *x / pixelfact_x;
940 *y = *y / pixelfact_y;
943 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
948 static void viewport_init_ra()
950 static gboolean done_before = FALSE;
954 for ( i = -90; i <= 90; i++)
955 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
960 double calcR (double lat)
962 double a = 6378.137, r, sc, x, y, z;
963 double e2 = 0.081082 * 0.081082;
965 * the radius of curvature of an ellipsoidal Earth in the plane of the
966 * meridian is given by
968 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
971 * where a is the equatorial radius, b is the polar radius, and e is
972 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
974 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
975 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
976 * = 0.081082 Eccentricity
982 z = 1.0 - e2 * sc * sc;
989 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
991 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
994 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
996 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
997 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1000 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1002 static GdkGCValues values;
1003 gdk_gc_get_values ( gc, &values );
1004 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1007 GdkFunction vik_gc_get_function ( GdkGC *gc )
1009 static GdkGCValues values;
1010 gdk_gc_get_values ( gc, &values );
1011 return values.function;
1014 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1016 vvp->drawmode = drawmode;
1017 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1018 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1020 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1021 if ( drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE )
1022 viewport_google_rezoom ( vvp );
1026 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1028 return vvp->drawmode;
1031 static void viewport_google_rezoom ( VikViewport *vvp )
1033 vvp->google_calcx_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 * 0.7716245833877 / vvp->xmpp);
1034 vvp->google_calcy_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 / vvp->ympp);
1035 vvp->google_calcx_rev_fact = 1 / vvp->google_calcx_fact;
1036 vvp->google_calcy_rev_fact = 1 / vvp->google_calcy_fact;
1039 /******** triggering *******/
1040 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1042 vp->trigger = trigger;
1045 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1050 void vik_viewport_snapshot_save ( VikViewport *vp )
1052 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1055 void vik_viewport_snapshot_load ( VikViewport *vp )
1057 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1060 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1062 vp->half_drawn = half_drawn;
1065 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1067 return vp->half_drawn;
1071 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1073 const gchar *name = NULL;
1074 VikWindow *vw = NULL;
1075 GtkWidget *mode_button;
1078 vw = VIK_WINDOW_FROM_WIDGET(vv);
1079 mode_button = vik_window_get_drawmode_button(vw, mode);
1080 label = gtk_bin_get_child(GTK_BIN(mode_button));
1082 name = gtk_label_get_text ( GTK_LABEL(label) );
1088 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1090 VikCoord tleft, tright, bleft, bright;
1092 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1093 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1094 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1095 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1097 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1098 vik_coord_convert(&tright, VIK_COORD_LATLON);
1099 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1100 vik_coord_convert(&bright, VIK_COORD_LATLON);
1102 *max_lat = MAX(tleft.north_south, tright.north_south);
1103 *min_lat = MIN(bleft.north_south, bright.north_south);
1104 *max_lon = MAX(tright.east_west, bright.east_west);
1105 *min_lon = MIN(tleft.east_west, bleft.east_west);