2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2007, Evan Battaglia <gtoevan@gmx.net>
6 * Lat/Lon plotting functions calcxy* are from GPSDrive
7 * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at>
9 * Multiple UTM zone patch by Kit Transue <notlostyet@didactek.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #define DEFAULT_BACKGROUND_COLOR "#CCCCCC"
39 #include "vikwindow.h"
40 #include "vikviewport.h"
47 static gdouble EASTING_OFFSET = 500000.0;
49 static void viewport_class_init ( VikViewportClass *klass );
50 static void viewport_init ( VikViewport *vvp );
51 static void viewport_finalize ( GObject *gob );
52 static void viewport_utm_zone_check ( VikViewport *vvp );
54 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 );
55 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 );
56 double calcR (double lat);
58 static double Radius[181];
59 static void viewport_init_ra();
61 static GObjectClass *parent_class;
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 )
167 ll.lat = a_vik_get_default_lat();
168 ll.lon = a_vik_get_default_long();
169 a_coords_latlon_to_utm ( &ll, &utm );
171 /* TODO: not static */
174 vvp->coord_mode = VIK_COORD_LATLON;
175 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
176 vvp->center.mode = VIK_COORD_LATLON;
177 vvp->center.north_south = ll.lat;
178 vvp->center.east_west = ll.lon;
179 vvp->center.utm_zone = (int)utm.zone;
180 vvp->center.utm_letter = utm.letter;
181 vvp->scr_buffer = NULL;
182 vvp->alpha_pixbuf = NULL;
183 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
184 vvp->utm_zone_width = 0.0;
185 vvp->background_gc = NULL;
186 vvp->scale_bg_gc = NULL;
187 vvp->draw_scale = TRUE;
188 vvp->draw_centermark = TRUE;
191 vvp->snapshot_buffer = NULL;
192 vvp->half_drawn = FALSE;
194 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
196 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
199 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
201 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
202 *rv = vvp->background_color;
206 /* returns pointer to internal static storage, changes next time function called, use quickly */
207 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
209 static gchar color[8];
210 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));
214 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
216 g_assert ( vvp && vvp->background_gc );
217 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
218 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
220 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
223 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
225 g_assert ( vvp && vvp->background_gc );
226 vvp->background_color = *color;
227 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
231 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
236 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
237 if ( gdk_color_parse ( colorname, &color ) )
238 gdk_gc_set_rgb_fg_color ( rv, &color );
240 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
241 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
245 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
249 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
250 gdk_gc_set_rgb_fg_color ( rv, color );
251 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
255 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
258 vvp->height = height;
259 if ( vvp->scr_buffer )
260 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 /* TODO trigger: only if this is enabled !!! */
264 if ( vvp->snapshot_buffer )
265 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
266 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
270 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
272 return vvp->scr_buffer;
275 gboolean vik_viewport_configure ( VikViewport *vvp )
277 g_return_val_if_fail ( vvp != NULL, TRUE );
279 vvp->width = GTK_WIDGET(vvp)->allocation.width;
280 vvp->height = GTK_WIDGET(vvp)->allocation.height;
282 if ( vvp->scr_buffer )
283 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
285 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
287 /* TODO trigger: only if enabled! */
288 if ( vvp->snapshot_buffer )
289 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
291 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
294 /* this is down here so it can get a GC (necessary?) */
295 if ( ! vvp->background_gc )
297 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
299 if ( !vvp->scale_bg_gc) {
300 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
306 static void viewport_finalize ( GObject *gob )
308 VikViewport *vvp = VIK_VIEWPORT(gob);
310 g_return_if_fail ( vvp != NULL );
312 if ( vvp->scr_buffer )
313 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
315 if ( vvp->snapshot_buffer )
316 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
318 if ( vvp->alpha_pixbuf )
319 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
321 if ( vvp->background_gc )
322 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
324 if ( vvp->scale_bg_gc ) {
325 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
326 vvp->scale_bg_gc = NULL;
329 G_OBJECT_CLASS(parent_class)->finalize(gob);
332 void vik_viewport_clear ( VikViewport *vvp )
334 g_return_if_fail ( vvp != NULL );
335 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
338 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
340 vvp->draw_scale = draw_scale;
343 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
345 return vvp->draw_scale;
348 void vik_viewport_draw_scale ( VikViewport *vvp )
350 g_return_if_fail ( vvp != NULL );
352 if ( vvp->draw_scale ) {
353 VikCoord left, right;
354 gdouble unit, base, diff, old_unit, old_diff, ratio;
355 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
356 PangoFontDescription *pfd;
360 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
361 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
363 vik_units_distance_t dist_units = a_vik_get_units_distance ();
364 switch (dist_units) {
365 case VIK_UNITS_DISTANCE_KILOMETRES:
366 base = vik_coord_diff ( &left, &right ); // in meters
368 case VIK_UNITS_DISTANCE_MILES:
369 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
370 base = vik_coord_diff ( &left, &right ) * 0.00621371192;
373 base = 1; // Keep the compiler happy
374 g_critical("Houston, we've had a problem. distance=%d", dist_units);
376 ratio = (vvp->width/SCSIZE)/base;
379 diff = fabs(base-unit);
383 while (diff <= old_diff) {
386 unit = unit * (odd%2 ? 5 : 2);
387 diff = fabs(base-unit);
393 /* white background */
394 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
395 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
396 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
397 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
398 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
399 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
401 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
402 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
403 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
404 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
405 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
406 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
409 for (i=1; i<5; i++) {
410 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
411 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
412 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
413 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
417 for (i=1; i<10; i++) {
418 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
419 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
420 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
421 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
424 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
425 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
426 pango_layout_set_font_description (pl, pfd);
427 pango_font_description_free (pfd);
429 switch (dist_units) {
430 case VIK_UNITS_DISTANCE_KILOMETRES:
432 sprintf(s, "%d km", (int)unit/1000);
434 sprintf(s, "%d m", (int)unit);
437 case VIK_UNITS_DISTANCE_MILES:
438 // Handle units in 0.1 miles
440 sprintf(s, "%0.1f miles", unit/10.0);
442 else if ((int)unit == 10.0) {
443 sprintf(s, "1 mile");
446 sprintf(s, "%d miles", (int)(unit/10.0));
450 g_critical("Houston, we've had a problem. distance=%d", dist_units);
452 pango_layout_set_text(pl, s, -1);
453 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
454 PAD + len + PAD, vvp->height - PAD - 10, pl);
460 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
462 vvp->draw_centermark = draw_centermark;
465 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
467 return vvp->draw_centermark;
470 void vik_viewport_draw_centermark ( VikViewport *vvp )
472 g_return_if_fail ( vvp != NULL );
474 if ( !vvp->draw_centermark )
479 int center_x = vvp->width/2;
480 int center_y = vvp->height/2;
481 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
483 /* white back ground */
484 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
485 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
486 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
487 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
488 /* black fore ground */
489 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
490 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
491 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
492 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
496 void vik_viewport_sync ( VikViewport *vvp )
498 g_return_if_fail ( vvp != NULL );
499 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);
502 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
506 g_return_if_fail ( vvp != NULL );
507 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);
513 x = vvp->width+x_off;
520 y = vvp->height+y_off;
523 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
524 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
527 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
529 g_return_if_fail ( vvp != NULL );
530 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
531 vvp->xmpp = vvp->ympp = xympp;
533 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
534 viewport_utm_zone_check(vvp);
537 /* or could do factor */
538 void vik_viewport_zoom_in ( VikViewport *vvp )
540 g_return_if_fail ( vvp != NULL );
541 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
546 viewport_utm_zone_check(vvp);
550 void vik_viewport_zoom_out ( VikViewport *vvp )
552 g_return_if_fail ( vvp != NULL );
553 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
558 viewport_utm_zone_check(vvp);
562 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
564 if ( vvp->xmpp == vvp->ympp )
569 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
574 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
579 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
581 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
583 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
584 viewport_utm_zone_check(vvp);
588 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
590 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
592 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
593 viewport_utm_zone_check(vvp);
598 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
600 g_return_val_if_fail ( vvp != NULL, NULL );
601 return &(vvp->center);
604 /* called every time we update coordinates/zoom */
605 static void viewport_utm_zone_check ( VikViewport *vvp )
607 if ( vvp->coord_mode == VIK_COORD_UTM )
611 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
612 a_coords_latlon_to_utm ( &ll, &utm );
613 if ( utm.zone != vvp->center.utm_zone )
614 *((struct UTM *)(&vvp->center)) = utm;
616 /* misc. stuff so we don't have to check later */
617 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
618 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
622 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
624 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
625 if ( vvp->coord_mode == VIK_COORD_UTM )
626 viewport_utm_zone_check ( vvp );
629 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
631 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
632 if ( vvp->coord_mode == VIK_COORD_UTM )
633 viewport_utm_zone_check ( vvp );
636 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
638 vvp->center = *coord;
639 if ( vvp->coord_mode == VIK_COORD_UTM )
640 viewport_utm_zone_check ( vvp );
643 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
645 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
647 /* get center, then just offset */
648 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
649 ul->mode = VIK_COORD_UTM;
652 ul->north_south += (vvp->ympp * vvp->height / 2);
653 ul->east_west -= (vvp->xmpp * vvp->width / 2);
654 br->north_south -= (vvp->ympp * vvp->height / 2);
655 br->east_west += (vvp->xmpp * vvp->width / 2);
658 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
660 if ( vvp->coord_mode == VIK_COORD_UTM ) {
661 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
662 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
667 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
669 if ( vvp->coord_mode == VIK_COORD_UTM ) {
671 g_assert ( vvp != NULL );
672 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
673 return coord.utm_zone;
678 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
680 if ( vvp->coord_mode == VIK_COORD_UTM ) {
682 g_assert ( vvp != NULL );
683 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
684 return coord.utm_zone;
690 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
692 g_return_if_fail ( vvp != NULL );
693 if ( vvp->coord_mode == VIK_COORD_UTM ) {
694 /* slightly optimized */
695 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
696 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
697 viewport_utm_zone_check ( vvp );
700 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
701 vik_viewport_set_center_coord ( vvp, &tmp );
705 gint vik_viewport_get_width( VikViewport *vvp )
707 g_return_val_if_fail ( vvp != NULL, 0 );
711 gint vik_viewport_get_height( VikViewport *vvp )
713 g_return_val_if_fail ( vvp != NULL, 0 );
717 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
719 g_return_if_fail ( vvp != NULL );
721 if ( vvp->coord_mode == VIK_COORD_UTM ) {
723 struct UTM *utm = (struct UTM *) coord;
724 coord->mode = VIK_COORD_UTM;
726 utm->zone = vvp->center.utm_zone;
727 utm->letter = vvp->center.utm_letter;
728 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
729 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
730 utm->zone += zone_delta;
731 utm->easting -= zone_delta * vvp->utm_zone_width;
732 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
733 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
734 coord->mode = VIK_COORD_LATLON;
735 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
736 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);
737 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
739 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
740 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
743 --> THIS IS JUNK HERE.
744 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
746 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
747 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
753 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
756 g_return_if_fail ( vvp != NULL );
758 if ( coord->mode != vvp->coord_mode )
760 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
761 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
765 if ( vvp->coord_mode == VIK_COORD_UTM ) {
766 struct UTM *center = (struct UTM *) &(vvp->center);
767 struct UTM *utm = (struct UTM *) coord;
768 if ( center->zone != utm->zone && vvp->one_utm_zone )
770 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
774 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
775 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
776 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
777 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
778 struct LatLon *center = (struct LatLon *) &(vvp->center);
779 struct LatLon *ll = (struct LatLon *) coord;
781 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
782 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 );
784 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
785 /* FIXMERCATOR: Optimize */
786 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
787 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
792 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
794 if ( *x1 > 20000 || *x1 < -20000 ) {
795 gdouble shrinkfactor = ABS(20000.0 / *x1);
796 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
797 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
798 } else if ( *y1 > 20000 || *y1 < -20000 ) {
799 gdouble shrinkfactor = ABS(20000.0 / *x1);
800 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
801 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
802 } else if ( *x2 > 20000 || *x2 < -20000 ) {
803 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
804 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
805 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
806 g_print("%f, %d, %d\n", shrinkfactor, *x2, *y2);
807 } else if ( *y2 > 20000 || *y2 < -20000 ) {
808 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
809 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
810 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
814 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
816 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
817 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
818 /*** clipping, yeah! ***/
819 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
820 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
824 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
826 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
827 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
830 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
832 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
833 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
836 /* shouldn't use this -- slow -- change the alpha channel instead. */
837 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
838 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
840 gint real_dest_x = MAX(dest_x,0);
841 gint real_dest_y = MAX(dest_y,0);
844 return; /* don't waste your time */
846 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
848 if ( vvp->alpha_pixbuf )
849 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
850 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
851 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
852 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
855 w = MIN(w,vvp->width - dest_x);
856 h = MIN(h,vvp->height - dest_y);
858 /* check that we are drawing within boundaries. */
859 src_x += (real_dest_x - dest_x);
860 src_y += (real_dest_y - dest_y);
861 w -= (real_dest_x - dest_x);
862 h -= (real_dest_y - dest_y);
864 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
865 real_dest_x, real_dest_y, 0, 0, w, h );
868 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
870 /* draw pixbuf_tmp */
871 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
874 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
875 gint dest_x, gint dest_y, gint w, gint h )
877 gdk_draw_pixbuf ( vvp->scr_buffer,
878 // GTK_WIDGET(vvp)->style->black_gc,
881 src_x, src_y, dest_x, dest_y, w, h,
882 GDK_RGB_DITHER_NONE, 0, 0 );
885 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
887 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
891 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
893 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
896 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
899 return vvp->coord_mode;
902 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
904 g_return_if_fail ( vvp != NULL );
905 vvp->coord_mode = mode;
906 vik_coord_convert ( &(vvp->center), mode );
909 /* Thanks GPSDrive */
910 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 )
913 gdouble dif, lat, lon;
914 double Ra = Radius[90+(gint)zero_lat];
916 px = (mapSizeX2 - x) * pixelfact_x;
917 py = (-mapSizeY2 + y) * pixelfact_y;
919 lat = zero_lat - py / Ra;
920 lat = zero_lat - py / Ra;
924 cos (lat * DEG2RAD));
926 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
927 lat = lat - dif / 1.5;
931 cos (lat * DEG2RAD));
938 /* Thanks GPSDrive */
939 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 )
943 gint mapSizeX = 2 * mapSizeX2;
944 gint mapSizeY = 2 * mapSizeY2;
946 g_assert ( lt >= -90.0 && lt <= 90.0 );
947 // lg *= rad2deg; // FIXME, optimize equations
949 Ra = Radius[90+(gint)lt];
951 cos (lt*DEG2RAD) * (lg - zero_long);
952 *y = Ra * (lt - zero_lat);
953 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
954 *y = *y + dif / 1.85;
955 *x = *x / pixelfact_x;
956 *y = *y / pixelfact_y;
959 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
964 static void viewport_init_ra()
966 static gboolean done_before = FALSE;
970 for ( i = -90; i <= 90; i++)
971 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
976 double calcR (double lat)
978 double a = 6378.137, r, sc, x, y, z;
979 double e2 = 0.081082 * 0.081082;
981 * the radius of curvature of an ellipsoidal Earth in the plane of the
982 * meridian is given by
984 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
987 * where a is the equatorial radius, b is the polar radius, and e is
988 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
990 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
991 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
992 * = 0.081082 Eccentricity
998 z = 1.0 - e2 * sc * sc;
1005 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1007 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1010 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1012 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1013 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1016 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1018 static GdkGCValues values;
1019 gdk_gc_get_values ( gc, &values );
1020 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1023 GdkFunction vik_gc_get_function ( GdkGC *gc )
1025 static GdkGCValues values;
1026 gdk_gc_get_values ( gc, &values );
1027 return values.function;
1030 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1032 vvp->drawmode = drawmode;
1033 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1034 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1036 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1040 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1042 return vvp->drawmode;
1045 /******** triggering *******/
1046 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1048 vp->trigger = trigger;
1051 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1056 void vik_viewport_snapshot_save ( VikViewport *vp )
1058 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1061 void vik_viewport_snapshot_load ( VikViewport *vp )
1063 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1066 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1068 vp->half_drawn = half_drawn;
1071 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1073 return vp->half_drawn;
1077 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1079 const gchar *name = NULL;
1080 VikWindow *vw = NULL;
1081 GtkWidget *mode_button;
1084 vw = VIK_WINDOW_FROM_WIDGET(vv);
1085 mode_button = vik_window_get_drawmode_button(vw, mode);
1086 label = gtk_bin_get_child(GTK_BIN(mode_button));
1088 name = gtk_label_get_text ( GTK_LABEL(label) );
1094 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1096 VikCoord tleft, tright, bleft, bright;
1098 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1099 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1100 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1101 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1103 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1104 vik_coord_convert(&tright, VIK_COORD_LATLON);
1105 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1106 vik_coord_convert(&bright, VIK_COORD_LATLON);
1108 *max_lat = MAX(tleft.north_south, tright.north_south);
1109 *min_lat = MIN(bleft.north_south, bright.north_south);
1110 *max_lon = MAX(tright.east_west, bright.east_west);
1111 *min_lon = MIN(tleft.east_west, bleft.east_west);