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"
42 #include "vikwindow.h"
43 #include "vikviewport.h"
50 static gdouble EASTING_OFFSET = 500000.0;
52 static void viewport_class_init ( VikViewportClass *klass );
53 static void viewport_init ( VikViewport *vvp );
54 static void viewport_finalize ( GObject *gob );
55 static void viewport_utm_zone_check ( VikViewport *vvp );
57 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 );
58 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 );
59 double calcR (double lat);
61 static double Radius[181];
62 static void viewport_init_ra();
64 static GObjectClass *parent_class;
68 GtkDrawingArea drawing_area;
69 GdkPixmap *scr_buffer;
72 VikCoordMode coord_mode;
75 GdkPixbuf *alpha_pixbuf;
76 guint8 alpha_pixbuf_width;
77 guint8 alpha_pixbuf_height;
79 gdouble utm_zone_width;
80 gboolean one_utm_zone;
83 GdkColor background_color;
88 /* Wether or not display OSD info */
90 gboolean draw_centermark;
92 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
93 VikViewportDrawMode drawmode;
95 /* handy conversion factors which make google plotting extremely fast */
96 gdouble google_calcx_fact;
97 gdouble google_calcy_fact;
98 gdouble google_calcx_rev_fact;
99 gdouble google_calcy_rev_fact;
103 GdkPixmap *snapshot_buffer;
108 viewport_utm_zone_width ( VikViewport *vvp )
110 if ( vvp->coord_mode == VIK_COORD_UTM ) {
113 /* get latitude of screen bottom */
114 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
115 utm.northing -= vvp -> height * vvp -> ympp / 2;
116 a_coords_utm_to_latlon ( &utm, &ll );
119 ll.lon = (utm.zone - 1) * 6 - 180 ;
120 a_coords_latlon_to_utm ( &ll, &utm);
121 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
127 GType vik_viewport_get_type (void)
129 static GType vvp_type = 0;
133 static const GTypeInfo vvp_info =
135 sizeof (VikViewportClass),
136 NULL, /* base_init */
137 NULL, /* base_finalize */
138 (GClassInitFunc) viewport_class_init,
139 NULL, /* class_finalize */
140 NULL, /* class_data */
141 sizeof (VikViewport),
143 (GInstanceInitFunc) viewport_init,
145 vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 );
150 static void viewport_class_init ( VikViewportClass *klass )
153 GObjectClass *object_class;
155 object_class = G_OBJECT_CLASS (klass);
157 object_class->finalize = viewport_finalize;
159 parent_class = g_type_class_peek_parent (klass);
162 VikViewport *vik_viewport_new ()
164 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
168 static void viewport_init ( VikViewport *vvp )
174 ll.lat = a_vik_get_default_lat();
175 ll.lon = a_vik_get_default_long();
176 a_coords_latlon_to_utm ( &ll, &utm );
178 /* TODO: not static */
181 vvp->coord_mode = VIK_COORD_LATLON;
182 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
183 vvp->center.mode = VIK_COORD_LATLON;
184 vvp->center.north_south = ll.lat;
185 vvp->center.east_west = ll.lon;
186 vvp->center.utm_zone = (int)utm.zone;
187 vvp->center.utm_letter = utm.letter;
188 vvp->scr_buffer = NULL;
189 vvp->alpha_pixbuf = NULL;
190 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
191 vvp->utm_zone_width = 0.0;
192 vvp->background_gc = NULL;
193 vvp->scale_bg_gc = NULL;
195 vvp->copyrights = NULL;
197 vvp->draw_scale = TRUE;
198 vvp->draw_centermark = TRUE;
201 vvp->snapshot_buffer = NULL;
202 vvp->half_drawn = FALSE;
204 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
206 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
209 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
211 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
212 *rv = vvp->background_color;
216 /* returns pointer to internal static storage, changes next time function called, use quickly */
217 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
219 static gchar color[8];
220 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));
224 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
226 g_assert ( vvp && vvp->background_gc );
227 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
228 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
230 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
233 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
235 g_assert ( vvp && vvp->background_gc );
236 vvp->background_color = *color;
237 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
241 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
246 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
247 if ( gdk_color_parse ( colorname, &color ) )
248 gdk_gc_set_rgb_fg_color ( rv, &color );
250 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
251 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
255 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
259 rv = gdk_gc_new ( GTK_WIDGET(vvp)->window );
260 gdk_gc_set_rgb_fg_color ( rv, color );
261 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
265 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
268 vvp->height = height;
269 if ( vvp->scr_buffer )
270 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
271 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
273 /* TODO trigger: only if this is enabled !!! */
274 if ( vvp->snapshot_buffer )
275 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
276 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
280 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
282 return vvp->scr_buffer;
285 gboolean vik_viewport_configure ( VikViewport *vvp )
287 g_return_val_if_fail ( vvp != NULL, TRUE );
289 vvp->width = GTK_WIDGET(vvp)->allocation.width;
290 vvp->height = GTK_WIDGET(vvp)->allocation.height;
292 if ( vvp->scr_buffer )
293 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
295 vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
297 /* TODO trigger: only if enabled! */
298 if ( vvp->snapshot_buffer )
299 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
301 vvp->snapshot_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 );
304 /* this is down here so it can get a GC (necessary?) */
305 if ( !vvp->background_gc )
307 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
308 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
310 if ( !vvp->scale_bg_gc) {
311 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
317 static void viewport_finalize ( GObject *gob )
319 VikViewport *vvp = VIK_VIEWPORT(gob);
321 g_return_if_fail ( vvp != NULL );
323 if ( vvp->scr_buffer )
324 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
326 if ( vvp->snapshot_buffer )
327 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
329 if ( vvp->alpha_pixbuf )
330 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
332 if ( vvp->background_gc )
333 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
335 if ( vvp->scale_bg_gc ) {
336 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
337 vvp->scale_bg_gc = NULL;
340 G_OBJECT_CLASS(parent_class)->finalize(gob);
344 * vik_viewport_clear:
347 * Clear the whole viewport.
349 void vik_viewport_clear ( VikViewport *vvp )
351 g_return_if_fail ( vvp != NULL );
352 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
353 vik_viewport_reset_copyrights ( vvp );
357 * vik_viewport_set_draw_scale:
359 * @draw_scale: new value
361 * Enable/Disable display of scale.
363 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
365 vvp->draw_scale = draw_scale;
368 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
370 return vvp->draw_scale;
373 void vik_viewport_draw_scale ( VikViewport *vvp )
375 g_return_if_fail ( vvp != NULL );
377 if ( vvp->draw_scale ) {
378 VikCoord left, right;
379 gdouble unit, base, diff, old_unit, old_diff, ratio;
380 gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10;
381 PangoFontDescription *pfd;
385 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
386 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
388 vik_units_distance_t dist_units = a_vik_get_units_distance ();
389 switch (dist_units) {
390 case VIK_UNITS_DISTANCE_KILOMETRES:
391 base = vik_coord_diff ( &left, &right ); // in meters
393 case VIK_UNITS_DISTANCE_MILES:
394 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
395 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
398 base = 1; // Keep the compiler happy
399 g_critical("Houston, we've had a problem. distance=%d", dist_units);
401 ratio = (vvp->width/SCSIZE)/base;
404 diff = fabs(base-unit);
408 while (diff <= old_diff) {
411 unit = unit * (odd%2 ? 5 : 2);
412 diff = fabs(base-unit);
418 /* white background */
419 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
420 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
421 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
422 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
423 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
424 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
426 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
427 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
428 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
429 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
430 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
431 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
434 for (i=1; i<5; i++) {
435 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
436 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
437 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
438 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
442 for (i=1; i<10; i++) {
443 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
444 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
445 vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
446 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
449 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
450 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
451 pango_layout_set_font_description (pl, pfd);
452 pango_font_description_free (pfd);
454 switch (dist_units) {
455 case VIK_UNITS_DISTANCE_KILOMETRES:
457 sprintf(s, "%d km", (int)unit/1000);
459 sprintf(s, "%d m", (int)unit);
462 case VIK_UNITS_DISTANCE_MILES:
463 // Handle units in 0.1 miles
465 sprintf(s, "%0.1f miles", unit/10.0);
467 else if ((int)unit == 10.0) {
468 sprintf(s, "1 mile");
471 sprintf(s, "%d miles", (int)(unit/10.0));
475 g_critical("Houston, we've had a problem. distance=%d", dist_units);
477 pango_layout_set_text(pl, s, -1);
478 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
479 PAD + len + PAD, vvp->height - PAD - 10, pl);
485 void vik_viewport_draw_copyright ( VikViewport *vvp )
487 g_return_if_fail ( vvp != NULL );
490 PangoFontDescription *pfd;
492 PangoRectangle ink_rect, logical_rect;
495 /* compute copyrights string */
496 guint len = g_slist_length ( vvp->copyrights );
498 for (i = 0 ; i < len ; i++)
500 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
501 strcat ( s, copyright );
505 /* create pango layout */
506 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
507 pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable?
508 pango_layout_set_font_description (pl, pfd);
509 pango_font_description_free (pfd);
511 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
514 pango_layout_set_text(pl, s, -1);
516 /* Use maximum of half the viewport width */
517 pango_layout_set_width ( pl, ( vvp->width / 2 - PAD ) * PANGO_SCALE );
518 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
519 vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc,
520 vvp->width / 2, vvp->height - PAD - logical_rect.height, pl);
528 * vik_viewport_set_draw_centermark:
530 * @draw_centermark: new value
532 * Enable/Disable display of center mark.
534 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
536 vvp->draw_centermark = draw_centermark;
539 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
541 return vvp->draw_centermark;
544 void vik_viewport_draw_centermark ( VikViewport *vvp )
546 g_return_if_fail ( vvp != NULL );
548 if ( !vvp->draw_centermark )
553 int center_x = vvp->width/2;
554 int center_y = vvp->height/2;
555 GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc;
557 /* white back ground */
558 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
559 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
560 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
561 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
562 /* black fore ground */
563 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
564 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
565 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
566 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
570 void vik_viewport_sync ( VikViewport *vvp )
572 g_return_if_fail ( vvp != NULL );
573 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);
576 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
580 g_return_if_fail ( vvp != NULL );
581 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);
587 x = vvp->width+x_off;
594 y = vvp->height+y_off;
597 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
598 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
601 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
603 g_return_if_fail ( vvp != NULL );
604 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM )
605 vvp->xmpp = vvp->ympp = xympp;
607 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
608 viewport_utm_zone_check(vvp);
611 /* or could do factor */
612 void vik_viewport_zoom_in ( VikViewport *vvp )
614 g_return_if_fail ( vvp != NULL );
615 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
620 viewport_utm_zone_check(vvp);
624 void vik_viewport_zoom_out ( VikViewport *vvp )
626 g_return_if_fail ( vvp != NULL );
627 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
632 viewport_utm_zone_check(vvp);
636 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
638 if ( vvp->xmpp == vvp->ympp )
643 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
648 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
653 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
655 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
657 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
658 viewport_utm_zone_check(vvp);
662 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
664 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
666 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
667 viewport_utm_zone_check(vvp);
672 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
674 g_return_val_if_fail ( vvp != NULL, NULL );
675 return &(vvp->center);
678 /* called every time we update coordinates/zoom */
679 static void viewport_utm_zone_check ( VikViewport *vvp )
681 if ( vvp->coord_mode == VIK_COORD_UTM )
685 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
686 a_coords_latlon_to_utm ( &ll, &utm );
687 if ( utm.zone != vvp->center.utm_zone )
688 *((struct UTM *)(&vvp->center)) = utm;
690 /* misc. stuff so we don't have to check later */
691 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
692 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
696 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll )
698 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
699 if ( vvp->coord_mode == VIK_COORD_UTM )
700 viewport_utm_zone_check ( vvp );
703 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm )
705 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
706 if ( vvp->coord_mode == VIK_COORD_UTM )
707 viewport_utm_zone_check ( vvp );
710 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord )
712 vvp->center = *coord;
713 if ( vvp->coord_mode == VIK_COORD_UTM )
714 viewport_utm_zone_check ( vvp );
717 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
719 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
721 /* get center, then just offset */
722 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
723 ul->mode = VIK_COORD_UTM;
726 ul->north_south += (vvp->ympp * vvp->height / 2);
727 ul->east_west -= (vvp->xmpp * vvp->width / 2);
728 br->north_south -= (vvp->ympp * vvp->height / 2);
729 br->east_west += (vvp->xmpp * vvp->width / 2);
732 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
734 if ( vvp->coord_mode == VIK_COORD_UTM ) {
735 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
736 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
741 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
743 if ( vvp->coord_mode == VIK_COORD_UTM ) {
745 g_assert ( vvp != NULL );
746 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
747 return coord.utm_zone;
752 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
754 if ( vvp->coord_mode == VIK_COORD_UTM ) {
756 g_assert ( vvp != NULL );
757 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
758 return coord.utm_zone;
764 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
766 g_return_if_fail ( vvp != NULL );
767 if ( vvp->coord_mode == VIK_COORD_UTM ) {
768 /* slightly optimized */
769 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
770 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
771 viewport_utm_zone_check ( vvp );
774 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
775 vik_viewport_set_center_coord ( vvp, &tmp );
779 gint vik_viewport_get_width( VikViewport *vvp )
781 g_return_val_if_fail ( vvp != NULL, 0 );
785 gint vik_viewport_get_height( VikViewport *vvp )
787 g_return_val_if_fail ( vvp != NULL, 0 );
791 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
793 g_return_if_fail ( vvp != NULL );
795 if ( vvp->coord_mode == VIK_COORD_UTM ) {
797 struct UTM *utm = (struct UTM *) coord;
798 coord->mode = VIK_COORD_UTM;
800 utm->zone = vvp->center.utm_zone;
801 utm->letter = vvp->center.utm_letter;
802 utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west;
803 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
804 utm->zone += zone_delta;
805 utm->easting -= zone_delta * vvp->utm_zone_width;
806 utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south;
807 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
808 coord->mode = VIK_COORD_LATLON;
809 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
810 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
811 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y));
812 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
813 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);
814 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
816 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2));
817 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) );
820 --> THIS IS JUNK HERE.
821 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
823 (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat);
824 DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll
830 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
833 g_return_if_fail ( vvp != NULL );
835 if ( coord->mode != vvp->coord_mode )
837 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
838 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
842 if ( vvp->coord_mode == VIK_COORD_UTM ) {
843 struct UTM *center = (struct UTM *) &(vvp->center);
844 struct UTM *utm = (struct UTM *) coord;
845 if ( center->zone != utm->zone && vvp->one_utm_zone )
847 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
851 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) -
852 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
853 *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp );
854 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
855 struct LatLon *center = (struct LatLon *) &(vvp->center);
856 struct LatLon *ll = (struct LatLon *) coord;
858 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
859 /* FIXMERCATOR: Optimize */
860 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
861 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0;
862 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
863 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 );
865 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
866 /* FIXMERCATOR: Optimize */
867 *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0;
868 *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0;
873 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
875 if ( *x1 > 20000 || *x1 < -20000 ) {
876 gdouble shrinkfactor = ABS(20000.0 / *x1);
877 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
878 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
879 } else if ( *y1 > 20000 || *y1 < -20000 ) {
880 gdouble shrinkfactor = ABS(20000.0 / *x1);
881 *x1 = *x2 + (shrinkfactor * (*x1-*x2));
882 *y1 = *y2 + (shrinkfactor * (*y1-*y2));
883 } else if ( *x2 > 20000 || *x2 < -20000 ) {
884 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
885 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
886 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
887 } else if ( *y2 > 20000 || *y2 < -20000 ) {
888 gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2);
889 *x2 = *x1 + (shrinkfactor * (*x2-*x1));
890 *y2 = *y1 + (shrinkfactor * (*y2-*y1));
894 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
896 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
897 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
898 /*** clipping, yeah! ***/
899 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
900 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
904 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
906 if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 )
907 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
910 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
912 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
913 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
916 /* shouldn't use this -- slow -- change the alpha channel instead. */
917 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
918 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
920 gint real_dest_x = MAX(dest_x,0);
921 gint real_dest_y = MAX(dest_y,0);
924 return; /* don't waste your time */
926 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
928 if ( vvp->alpha_pixbuf )
929 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
930 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
931 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
932 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
935 w = MIN(w,vvp->width - dest_x);
936 h = MIN(h,vvp->height - dest_y);
938 /* check that we are drawing within boundaries. */
939 src_x += (real_dest_x - dest_x);
940 src_y += (real_dest_y - dest_y);
941 w -= (real_dest_x - dest_x);
942 h -= (real_dest_y - dest_y);
944 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
945 real_dest_x, real_dest_y, 0, 0, w, h );
948 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
950 /* draw pixbuf_tmp */
951 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
954 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
955 gint dest_x, gint dest_y, gint w, gint h )
957 gdk_draw_pixbuf ( vvp->scr_buffer,
958 // GTK_WIDGET(vvp)->style->black_gc,
961 src_x, src_y, dest_x, dest_y, w, h,
962 GDK_RGB_DITHER_NONE, 0, 0 );
965 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
967 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
971 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
973 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
976 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
979 return vvp->coord_mode;
982 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
984 g_return_if_fail ( vvp != NULL );
985 vvp->coord_mode = mode;
986 vik_coord_convert ( &(vvp->center), mode );
989 /* Thanks GPSDrive */
990 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 )
993 gdouble dif, lat, lon;
994 double Ra = Radius[90+(gint)zero_lat];
996 px = (mapSizeX2 - x) * pixelfact_x;
997 py = (-mapSizeY2 + y) * pixelfact_y;
999 lat = zero_lat - py / Ra;
1000 lat = zero_lat - py / Ra;
1004 cos (lat * DEG2RAD));
1006 dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD)));
1007 lat = lat - dif / 1.5;
1011 cos (lat * DEG2RAD));
1018 /* Thanks GPSDrive */
1019 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 )
1023 gint mapSizeX = 2 * mapSizeX2;
1024 gint mapSizeY = 2 * mapSizeY2;
1026 g_assert ( lt >= -90.0 && lt <= 90.0 );
1027 // lg *= rad2deg; // FIXME, optimize equations
1029 Ra = Radius[90+(gint)lt];
1031 cos (lt*DEG2RAD) * (lg - zero_long);
1032 *y = Ra * (lt - zero_lat);
1033 dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long)))));
1034 *y = *y + dif / 1.85;
1035 *x = *x / pixelfact_x;
1036 *y = *y / pixelfact_y;
1037 *x = mapSizeX2 - *x;
1039 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1044 static void viewport_init_ra()
1046 static gboolean done_before = FALSE;
1050 for ( i = -90; i <= 90; i++)
1051 Radius[i+90] = calcR ( (double)i ) * DEG2RAD;
1056 double calcR (double lat)
1058 double a = 6378.137, r, sc, x, y, z;
1059 double e2 = 0.081082 * 0.081082;
1061 * the radius of curvature of an ellipsoidal Earth in the plane of the
1062 * meridian is given by
1064 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1067 * where a is the equatorial radius, b is the polar radius, and e is
1068 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1070 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1071 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1072 * = 0.081082 Eccentricity
1075 lat = lat * DEG2RAD;
1078 z = 1.0 - e2 * sc * sc;
1085 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1087 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1090 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1092 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1093 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1096 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1098 static GdkGCValues values;
1099 gdk_gc_get_values ( gc, &values );
1100 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1103 GdkFunction vik_gc_get_function ( GdkGC *gc )
1105 static GdkGCValues values;
1106 gdk_gc_get_values ( gc, &values );
1107 return values.function;
1110 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1112 vvp->drawmode = drawmode;
1113 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1114 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1116 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1120 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1122 return vvp->drawmode;
1125 /******** triggering *******/
1126 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1128 vp->trigger = trigger;
1131 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1136 void vik_viewport_snapshot_save ( VikViewport *vp )
1138 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1141 void vik_viewport_snapshot_load ( VikViewport *vp )
1143 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1146 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1148 vp->half_drawn = half_drawn;
1151 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1153 return vp->half_drawn;
1157 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1159 const gchar *name = NULL;
1160 VikWindow *vw = NULL;
1161 GtkWidget *mode_button;
1164 vw = VIK_WINDOW_FROM_WIDGET(vv);
1165 mode_button = vik_window_get_drawmode_button(vw, mode);
1166 label = gtk_bin_get_child(GTK_BIN(mode_button));
1168 name = gtk_label_get_text ( GTK_LABEL(label) );
1174 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1176 VikCoord tleft, tright, bleft, bright;
1178 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1179 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1180 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1181 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1183 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1184 vik_coord_convert(&tright, VIK_COORD_LATLON);
1185 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1186 vik_coord_convert(&bright, VIK_COORD_LATLON);
1188 *max_lat = MAX(tleft.north_south, tright.north_south);
1189 *min_lat = MIN(bleft.north_south, bright.north_south);
1190 *max_lon = MAX(tright.east_west, bright.east_west);
1191 *min_lon = MIN(tleft.east_west, bleft.east_west);
1194 void vik_viewport_reset_copyrights ( VikViewport *vp )
1196 g_return_if_fail ( vp != NULL );
1197 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1198 g_slist_free ( vp->copyrights );
1199 vp->copyrights = NULL;
1203 * vik_viewport_add_copyright:
1205 * @copyright: new copyright to display
1207 * Add a copyright to display on viewport.
1209 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1211 g_return_if_fail ( vp != NULL );
1214 gchar *found = (gchar*)g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1215 if ( found == NULL )
1217 gchar *duple = g_strdup ( copyright );
1218 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );