2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2007, Evan Battaglia <gtoevan@gmx.net>
5 * Copyright (C) 2013, Rob Norris <rw_norris@hotmail.com>
7 * Lat/Lon plotting functions calcxy* are from GPSDrive
8 * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at>
10 * Multiple UTM zone patch by Kit Transue <notlostyet@didactek.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31 #define DEFAULT_BACKGROUND_COLOR "#CCCCCC"
32 #define DEFAULT_HIGHLIGHT_COLOR "#EEA500"
33 /* Default highlight in orange */
45 #include "vikwindow.h"
46 #include "vikviewport.h"
54 #define MERCATOR_FACTOR(x) ( (65536.0 / 180 / (x)) * 256.0 )
56 static gdouble EASTING_OFFSET = 500000.0;
60 static void viewport_finalize ( GObject *gob );
61 static void viewport_utm_zone_check ( VikViewport *vvp );
62 static void update_centers ( VikViewport *vvp );
63 static void free_centers ( VikViewport *vvp, guint start );
65 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 );
66 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 );
67 double calcR (double lat);
69 static double Radius[181];
70 static void viewport_init_ra();
72 static GObjectClass *parent_class;
75 GtkDrawingArea drawing_area;
76 GdkPixmap *scr_buffer;
78 gint width_2, height_2; // Half of the normal width and height
80 VikCoordMode coord_mode;
82 gdouble xmfactor, ymfactor;
83 GList *centers; // The history of requested positions (of VikCoord type)
84 guint centers_index; // current position within the history list
85 guint centers_max; // configurable maximum size of the history list
86 guint centers_radius; // Metres
88 GdkPixbuf *alpha_pixbuf;
89 guint8 alpha_pixbuf_width;
90 guint8 alpha_pixbuf_height;
92 gdouble utm_zone_width;
93 gboolean one_utm_zone;
96 GdkColor background_color;
102 /* Wether or not display OSD info */
104 gboolean draw_centermark;
105 gboolean draw_highlight;
107 GdkColor highlight_color;
109 /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */
110 VikViewportDrawMode drawmode;
114 GdkPixmap *snapshot_buffer;
119 viewport_utm_zone_width ( VikViewport *vvp )
121 if ( vvp->coord_mode == VIK_COORD_UTM ) {
124 /* get latitude of screen bottom */
125 struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp )));
126 utm.northing -= vvp -> height * vvp -> ympp / 2;
127 a_coords_utm_to_latlon ( &utm, &ll );
130 ll.lon = (utm.zone - 1) * 6 - 180 ;
131 a_coords_latlon_to_utm ( &ll, &utm);
132 return fabs ( utm.easting - EASTING_OFFSET ) * 2;
138 VW_UPDATED_CENTER_SIGNAL = 0,
141 static guint viewport_signals[VW_LAST_SIGNAL] = { 0 };
143 G_DEFINE_TYPE (VikViewport, vik_viewport, GTK_TYPE_DRAWING_AREA)
146 vik_viewport_class_init ( VikViewportClass *klass )
149 GObjectClass *object_class;
151 object_class = G_OBJECT_CLASS (klass);
153 object_class->finalize = viewport_finalize;
155 parent_class = g_type_class_peek_parent (klass);
157 viewport_signals[VW_UPDATED_CENTER_SIGNAL] = g_signal_new ( "updated_center", G_TYPE_FROM_CLASS (klass),
158 G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION, G_STRUCT_OFFSET (VikViewportClass, updated_center), NULL, NULL,
159 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
162 VikViewport *vik_viewport_new ()
164 VikViewport *vv = VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) );
168 #define VIK_SETTINGS_VIEW_LAST_LATITUDE "viewport_last_latitude"
169 #define VIK_SETTINGS_VIEW_LAST_LONGITUDE "viewport_last_longitude"
170 #define VIK_SETTINGS_VIEW_LAST_ZOOM_X "viewport_last_zoom_xpp"
171 #define VIK_SETTINGS_VIEW_LAST_ZOOM_Y "viewport_last_zoom_ypp"
172 #define VIK_SETTINGS_VIEW_HISTORY_SIZE "viewport_history_size"
173 #define VIK_SETTINGS_VIEW_HISTORY_DIFF_DIST "viewport_history_diff_dist"
176 vik_viewport_init ( VikViewport *vvp )
182 ll.lat = a_vik_get_default_lat();
183 ll.lon = a_vik_get_default_long();
184 gdouble zoom_x = 4.0;
185 gdouble zoom_y = 4.0;
187 if ( a_vik_get_startup_method ( ) == VIK_STARTUP_METHOD_LAST_LOCATION ) {
188 gdouble lat, lon, dzoom;
189 if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_LATITUDE, &lat ) )
191 if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_LONGITUDE, &lon ) )
193 if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_X, &dzoom ) )
195 if ( a_settings_get_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_Y, &dzoom ) )
199 a_coords_latlon_to_utm ( &ll, &utm );
203 vvp->xmfactor = MERCATOR_FACTOR (vvp->xmpp);
204 vvp->ymfactor = MERCATOR_FACTOR (vvp->ympp);
205 vvp->coord_mode = VIK_COORD_LATLON;
206 vvp->drawmode = VIK_VIEWPORT_DRAWMODE_MERCATOR;
207 vvp->center.mode = VIK_COORD_LATLON;
208 vvp->center.north_south = ll.lat;
209 vvp->center.east_west = ll.lon;
210 vvp->center.utm_zone = (int)utm.zone;
211 vvp->center.utm_letter = utm.letter;
212 vvp->scr_buffer = NULL;
213 vvp->alpha_pixbuf = NULL;
214 vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0;
215 vvp->utm_zone_width = 0.0;
216 vvp->background_gc = NULL;
217 vvp->highlight_gc = NULL;
218 vvp->scale_bg_gc = NULL;
220 vvp->copyrights = NULL;
222 vvp->centers_index = 0;
223 vvp->centers_max = 20;
224 gint tmp = vvp->centers_max;
225 if ( a_settings_get_integer ( VIK_SETTINGS_VIEW_HISTORY_SIZE, &tmp ) )
226 vvp->centers_max = tmp;
227 vvp->centers_radius = 500;
228 if ( a_settings_get_integer ( VIK_SETTINGS_VIEW_HISTORY_DIFF_DIST, &tmp ) )
229 vvp->centers_radius = tmp;
231 vvp->draw_scale = TRUE;
232 vvp->draw_centermark = TRUE;
233 vvp->draw_highlight = TRUE;
236 vvp->snapshot_buffer = NULL;
237 vvp->half_drawn = FALSE;
239 // Initiate center history
240 update_centers ( vvp );
242 g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL);
244 #if GTK_CHECK_VERSION (2,18,0)
245 gtk_widget_set_can_focus ( GTK_WIDGET(vvp), TRUE );
247 GTK_WIDGET_SET_FLAGS(vvp, GTK_CAN_FOCUS); /* allow VVP to have focus -- enabling key events, etc */
251 GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp )
253 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
254 *rv = vvp->background_color;
258 /* returns pointer to internal static storage, changes next time function called, use quickly */
259 const gchar *vik_viewport_get_background_color ( VikViewport *vvp )
261 static gchar color[8];
262 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));
266 void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname )
268 g_assert ( vvp && vvp->background_gc );
269 if ( gdk_color_parse ( colorname, &(vvp->background_color) ) )
270 gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) );
272 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
275 void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color )
277 g_assert ( vvp && vvp->background_gc );
278 vvp->background_color = *color;
279 gdk_gc_set_rgb_fg_color ( vvp->background_gc, color );
282 GdkColor *vik_viewport_get_highlight_gdkcolor ( VikViewport *vvp )
284 GdkColor *rv = g_malloc ( sizeof ( GdkColor ) );
285 *rv = vvp->highlight_color;
289 /* returns pointer to internal static storage, changes next time function called, use quickly */
290 const gchar *vik_viewport_get_highlight_color ( VikViewport *vvp )
292 static gchar color[8];
293 g_snprintf(color, sizeof(color), "#%.2x%.2x%.2x", (int)(vvp->highlight_color.red/256),(int)(vvp->highlight_color.green/256),(int)(vvp->highlight_color.blue/256));
297 void vik_viewport_set_highlight_color ( VikViewport *vvp, const gchar *colorname )
299 g_assert ( vvp->highlight_gc );
300 gdk_color_parse ( colorname, &(vvp->highlight_color) );
301 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, &(vvp->highlight_color) );
304 void vik_viewport_set_highlight_gdkcolor ( VikViewport *vvp, GdkColor *color )
306 g_assert ( vvp->highlight_gc );
307 vvp->highlight_color = *color;
308 gdk_gc_set_rgb_fg_color ( vvp->highlight_gc, color );
311 GdkGC *vik_viewport_get_gc_highlight ( VikViewport *vvp )
313 return vvp->highlight_gc;
316 void vik_viewport_set_highlight_thickness ( VikViewport *vvp, gint thickness )
318 // Otherwise same GDK_* attributes as in vik_viewport_new_gc
319 gdk_gc_set_line_attributes ( vvp->highlight_gc, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
322 GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness )
327 rv = gdk_gc_new ( gtk_widget_get_window(GTK_WIDGET(vvp)) );
328 if ( gdk_color_parse ( colorname, &color ) )
329 gdk_gc_set_rgb_fg_color ( rv, &color );
331 g_warning("%s: Failed to parse color '%s'", __FUNCTION__, colorname);
332 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
336 GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness )
340 rv = gdk_gc_new ( gtk_widget_get_window(GTK_WIDGET(vvp)) );
341 gdk_gc_set_rgb_fg_color ( rv, color );
342 gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND );
346 void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height )
349 vvp->height = height;
351 vvp->width_2 = vvp->width/2;
352 vvp->height_2 = vvp->height/2;
354 if ( vvp->scr_buffer )
355 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
356 vvp->scr_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
358 /* TODO trigger: only if this is enabled !!! */
359 if ( vvp->snapshot_buffer )
360 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
361 vvp->snapshot_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
365 GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp )
367 return vvp->scr_buffer;
370 gboolean vik_viewport_configure ( VikViewport *vvp )
372 g_return_val_if_fail ( vvp != NULL, TRUE );
374 GtkAllocation allocation;
375 gtk_widget_get_allocation ( GTK_WIDGET(vvp), &allocation );
376 vvp->width = allocation.width;
377 vvp->height = allocation.height;
379 vvp->width_2 = vvp->width/2;
380 vvp->height_2 = vvp->height/2;
382 if ( vvp->scr_buffer )
383 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
385 vvp->scr_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
387 /* TODO trigger: only if enabled! */
388 if ( vvp->snapshot_buffer )
389 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
391 vvp->snapshot_buffer = gdk_pixmap_new ( gtk_widget_get_window(GTK_WIDGET(vvp)), vvp->width, vvp->height, -1 );
394 /* this is down here so it can get a GC (necessary?) */
395 if ( !vvp->background_gc )
397 vvp->background_gc = vik_viewport_new_gc ( vvp, DEFAULT_BACKGROUND_COLOR, 1 );
398 vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR );
400 if ( ! vvp->highlight_gc )
402 vvp->highlight_gc = vik_viewport_new_gc ( vvp, DEFAULT_HIGHLIGHT_COLOR, 1 );
403 vik_viewport_set_highlight_color ( vvp, DEFAULT_HIGHLIGHT_COLOR );
405 if ( !vvp->scale_bg_gc) {
406 vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3);
412 static void viewport_finalize ( GObject *gob )
414 VikViewport *vvp = VIK_VIEWPORT(gob);
416 g_return_if_fail ( vvp != NULL );
418 if ( a_vik_get_startup_method ( ) == VIK_STARTUP_METHOD_LAST_LOCATION ) {
420 vik_coord_to_latlon ( &(vvp->center), &ll );
421 a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_LATITUDE, ll.lat );
422 a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_LONGITUDE, ll.lon );
423 a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_X, vvp->xmpp );
424 a_settings_set_double ( VIK_SETTINGS_VIEW_LAST_ZOOM_Y, vvp->ympp );
428 free_centers ( vvp, 0 );
430 if ( vvp->scr_buffer )
431 g_object_unref ( G_OBJECT ( vvp->scr_buffer ) );
433 if ( vvp->snapshot_buffer )
434 g_object_unref ( G_OBJECT ( vvp->snapshot_buffer ) );
436 if ( vvp->alpha_pixbuf )
437 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
439 if ( vvp->background_gc )
440 g_object_unref ( G_OBJECT ( vvp->background_gc ) );
442 if ( vvp->highlight_gc )
443 g_object_unref ( G_OBJECT ( vvp->highlight_gc ) );
445 if ( vvp->scale_bg_gc ) {
446 g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) );
447 vvp->scale_bg_gc = NULL;
450 G_OBJECT_CLASS(parent_class)->finalize(gob);
454 * vik_viewport_clear:
457 * Clear the whole viewport.
459 void vik_viewport_clear ( VikViewport *vvp )
461 g_return_if_fail ( vvp != NULL );
462 gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height);
463 vik_viewport_reset_copyrights ( vvp );
464 vik_viewport_reset_logos ( vvp );
468 * vik_viewport_set_draw_scale:
470 * @draw_scale: new value
472 * Enable/Disable display of scale.
474 void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale )
476 vvp->draw_scale = draw_scale;
479 gboolean vik_viewport_get_draw_scale ( VikViewport *vvp )
481 return vvp->draw_scale;
484 void vik_viewport_draw_scale ( VikViewport *vvp )
486 g_return_if_fail ( vvp != NULL );
488 if ( vvp->draw_scale ) {
489 VikCoord left, right;
490 gdouble unit, base, diff, old_unit, old_diff, ratio;
491 gint odd, len, SCSIZE = 5, HEIGHT=10;
495 vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left );
496 vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right );
498 vik_units_distance_t dist_units = a_vik_get_units_distance ();
499 switch (dist_units) {
500 case VIK_UNITS_DISTANCE_KILOMETRES:
501 base = vik_coord_diff ( &left, &right ); // in meters
503 case VIK_UNITS_DISTANCE_MILES:
504 // in 0.1 miles (copes better when zoomed in as 1 mile can be too big)
505 base = VIK_METERS_TO_MILES(vik_coord_diff ( &left, &right )) * 10.0;
507 case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
508 // in 0.1 NM (copes better when zoomed in as 1 NM can be too big)
509 base = VIK_METERS_TO_NAUTICAL_MILES(vik_coord_diff ( &left, &right )) * 10.0;
512 base = 1; // Keep the compiler happy
513 g_critical("Houston, we've had a problem. distance=%d", dist_units);
515 ratio = (vvp->width/SCSIZE)/base;
518 diff = fabs(base-unit);
522 while (diff <= old_diff) {
525 unit = unit * (odd%2 ? 5 : 2);
526 diff = fabs(base-unit);
532 /* white background */
533 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
534 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
535 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
536 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
537 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
538 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
540 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
541 PAD, vvp->height-PAD, PAD + len, vvp->height-PAD);
542 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
543 PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT);
544 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
545 PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT);
548 for (i=1; i<5; i++) {
549 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
550 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
551 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
552 PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
556 for (i=1; i<10; i++) {
557 vik_viewport_draw_line(vvp, vvp->scale_bg_gc,
558 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
559 vik_viewport_draw_line(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
560 PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2)));
563 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
564 pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
566 switch (dist_units) {
567 case VIK_UNITS_DISTANCE_KILOMETRES:
569 sprintf(s, "%d km", (int)unit/1000);
571 sprintf(s, "%d m", (int)unit);
574 case VIK_UNITS_DISTANCE_MILES:
575 // Handle units in 0.1 miles
577 sprintf(s, "%0.1f miles", unit/10.0);
579 else if ((int)unit == 10.0) {
580 sprintf(s, "1 mile");
583 sprintf(s, "%d miles", (int)(unit/10.0));
586 case VIK_UNITS_DISTANCE_NAUTICAL_MILES:
587 // Handle units in 0.1 NM
589 sprintf(s, "%0.1f NM", unit/10.0);
591 else if ((int)unit == 10.0) {
595 sprintf(s, "%d NMs", (int)(unit/10.0));
599 g_critical("Houston, we've had a problem. distance=%d", dist_units);
601 pango_layout_set_text(pl, s, -1);
602 vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
603 PAD + len + PAD, vvp->height - PAD - 10, pl);
609 void vik_viewport_draw_copyright ( VikViewport *vvp )
611 g_return_if_fail ( vvp != NULL );
614 PangoRectangle ink_rect, logical_rect;
617 /* compute copyrights string */
618 guint len = g_slist_length ( vvp->copyrights );
621 for (i = 0 ; i < len ; i++)
623 // Stop when buffer is full
624 int slen = strlen ( s );
628 gchar *copyright = g_slist_nth_data ( vvp->copyrights, i );
630 // Only use part of this copyright that fits in the available space left
631 // remembering 1 character is left available for the appended space
632 int clen = strlen ( copyright );
633 if ( slen + clen > 126 ) {
637 strncat ( s, copyright, clen );
641 /* create pango layout */
642 pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL);
643 pango_layout_set_font_description (pl, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->font_desc);
644 pango_layout_set_alignment ( pl, PANGO_ALIGN_RIGHT );
647 pango_layout_set_text(pl, s, -1);
649 /* Use maximum of half the viewport width */
650 pango_layout_set_width ( pl, ( vvp->width / 2 ) * PANGO_SCALE );
651 pango_layout_get_pixel_extents(pl, &ink_rect, &logical_rect);
652 vik_viewport_draw_layout(vvp, gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc,
653 vvp->width / 2, vvp->height - logical_rect.height, pl);
661 * vik_viewport_set_draw_centermark:
663 * @draw_centermark: new value
665 * Enable/Disable display of center mark.
667 void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark )
669 vvp->draw_centermark = draw_centermark;
672 gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp )
674 return vvp->draw_centermark;
677 void vik_viewport_draw_centermark ( VikViewport *vvp )
679 g_return_if_fail ( vvp != NULL );
681 if ( !vvp->draw_centermark )
686 int center_x = vvp->width/2;
687 int center_y = vvp->height/2;
688 GdkGC * black_gc = gtk_widget_get_style(GTK_WIDGET(&vvp->drawing_area))->black_gc;
690 /* white back ground */
691 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y);
692 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y);
693 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap);
694 vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len);
695 /* black fore ground */
696 vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y);
697 vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y);
698 vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap);
699 vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len);
703 void vik_viewport_draw_logo ( VikViewport *vvp )
705 g_return_if_fail ( vvp != NULL );
707 guint len = g_slist_length ( vvp->logos );
708 gint x = vvp->width - PAD;
711 for (i = 0 ; i < len ; i++)
713 GdkPixbuf *logo = g_slist_nth_data ( vvp->logos, i );
714 gint width = gdk_pixbuf_get_width ( logo );
715 gint height = gdk_pixbuf_get_height ( logo );
716 vik_viewport_draw_pixbuf ( vvp, logo, 0, 0, x - width, y, width, height );
721 void vik_viewport_set_draw_highlight ( VikViewport *vvp, gboolean draw_highlight )
723 vvp->draw_highlight = draw_highlight;
726 gboolean vik_viewport_get_draw_highlight ( VikViewport *vvp )
728 return vvp->draw_highlight;
731 void vik_viewport_sync ( VikViewport *vvp )
733 g_return_if_fail ( vvp != NULL );
734 gdk_draw_drawable(gtk_widget_get_window(GTK_WIDGET(vvp)), gtk_widget_get_style(GTK_WIDGET(vvp))->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, 0, 0, vvp->width, vvp->height);
737 void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off )
741 g_return_if_fail ( vvp != NULL );
742 gdk_draw_drawable(gtk_widget_get_window(GTK_WIDGET(vvp)), gtk_widget_get_style(GTK_WIDGET(vvp))->bg_gc[0], GDK_DRAWABLE(vvp->scr_buffer), 0, 0, x_off, y_off, vvp->width, vvp->height);
748 x = vvp->width+x_off;
755 y = vvp->height+y_off;
758 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height);
759 gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei);
762 void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp )
764 g_return_if_fail ( vvp != NULL );
765 if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM ) {
766 vvp->xmpp = vvp->ympp = xympp;
767 // Since xmpp & ympp are the same it doesn't matter which one is used here
768 vvp->xmfactor = vvp->ymfactor = MERCATOR_FACTOR(vvp->xmpp);
771 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
772 viewport_utm_zone_check(vvp);
775 /* or could do factor */
776 void vik_viewport_zoom_in ( VikViewport *vvp )
778 g_return_if_fail ( vvp != NULL );
779 if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) )
784 vvp->xmfactor = MERCATOR_FACTOR(vvp->xmpp);
785 vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
787 viewport_utm_zone_check(vvp);
791 void vik_viewport_zoom_out ( VikViewport *vvp )
793 g_return_if_fail ( vvp != NULL );
794 if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) )
799 vvp->xmfactor = MERCATOR_FACTOR(vvp->xmpp);
800 vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
802 viewport_utm_zone_check(vvp);
806 gdouble vik_viewport_get_zoom ( VikViewport *vvp )
808 if ( vvp->xmpp == vvp->ympp )
813 gdouble vik_viewport_get_xmpp ( VikViewport *vvp )
818 gdouble vik_viewport_get_ympp ( VikViewport *vvp )
823 void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp )
825 if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) {
827 vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
828 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
829 viewport_utm_zone_check(vvp);
833 void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp )
835 if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) {
837 vvp->ymfactor = MERCATOR_FACTOR(vvp->ympp);
838 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
839 viewport_utm_zone_check(vvp);
844 const VikCoord *vik_viewport_get_center ( VikViewport *vvp )
846 g_return_val_if_fail ( vvp != NULL, NULL );
847 return &(vvp->center);
850 /* called every time we update coordinates/zoom */
851 static void viewport_utm_zone_check ( VikViewport *vvp )
853 if ( vvp->coord_mode == VIK_COORD_UTM )
857 a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll );
858 a_coords_latlon_to_utm ( &ll, &utm );
859 if ( utm.zone != vvp->center.utm_zone )
860 *((struct UTM *)(&vvp->center)) = utm;
862 /* misc. stuff so we don't have to check later */
863 vvp->utm_zone_width = viewport_utm_zone_width ( vvp );
864 vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) );
869 * Free an individual center position in the history list
871 static void free_center ( VikViewport *vvp, guint index )
873 VikCoord *coord = g_list_nth_data ( vvp->centers, index );
876 GList *gl = g_list_nth ( vvp->centers, index );
878 vvp->centers = g_list_delete_link ( vvp->centers, gl );
882 * Free a set of center positions in the history list,
883 * from the indicated start index to the end of the list
885 static void free_centers ( VikViewport *vvp, guint start )
887 // Have to work backward since we delete items referenced by the '_nth()' values,
888 // otherwise if processed forward - removing the lower nth index entries would change the subsequent indexing
889 for ( guint i = g_list_length(vvp->centers)-1; i > start; i-- )
890 free_center ( vvp, i );
894 * Store the current center position into the history list
895 * and emit a signal to notify clients the list has been updated
897 static void update_centers ( VikViewport *vvp )
899 VikCoord *new_center = g_malloc(sizeof (VikCoord));
900 *new_center = vvp->center;
902 if ( vvp->centers_index ) {
904 if ( vvp->centers_index == vvp->centers_max-1 ) {
905 // List is full, so drop the oldest value to make room for the new one
906 free_center ( vvp, 0 );
907 vvp->centers_index--;
910 // Reset the now unused section of the list
911 // Free from the index to the end
912 free_centers ( vvp, vvp->centers_index+1 );
917 // Store new position
918 // NB ATM this can be the same location as the last one in the list
919 vvp->centers = g_list_append ( vvp->centers, new_center );
921 // Reset to the end (NB should be same as centers_index++)
922 vvp->centers_index = g_list_length ( vvp->centers ) - 1;
924 // Inform interested subscribers that this change has occurred
925 g_signal_emit ( G_OBJECT(vvp), viewport_signals[VW_UPDATED_CENTER_SIGNAL], 0 );
929 * Show the list of forward/backward positions
930 * ATM only for debug usage
932 void vik_viewport_show_centers ( VikViewport *vvp, GtkWindow *parent )
937 for (node = vvp->centers; node != NULL; node = g_list_next(node)) {
938 gchar *lat = NULL, *lon = NULL;
940 vik_coord_to_latlon (node->data, &ll);
941 a_coords_latlon_to_string ( &ll, &lat, &lon );
943 if ( index == vvp->centers_index-1 )
944 extra = g_strdup ( " [Back]" );
945 else if ( index == vvp->centers_index+1 )
946 extra = g_strdup ( " [Forward]" );
948 extra = g_strdup ( "" );
949 texts = g_list_prepend ( texts , g_strdup_printf ( "%s %s%s", lat, lon, extra ) );
956 // NB: No i18n as this is just for debug
957 // Using this function the dialog allows sorting of the list which isn't appropriate here
958 // but this doesn't matter much for debug purposes of showing stuff...
959 GList *ans = a_dialog_select_from_list(parent,
962 "Back/Forward Locations",
963 "Back/Forward Locations");
964 for (node = ans; node != NULL; node = g_list_next(node))
967 for (node = texts; node != NULL; node = g_list_next(node))
973 * vik_viewport_go_back:
975 * Move back in the position history
977 * Returns: %TRUE one success
979 gboolean vik_viewport_go_back ( VikViewport *vvp )
981 // see if the current position is different from the last saved center position within a certain radius
982 VikCoord *center = g_list_nth_data ( vvp->centers, vvp->centers_index );
984 // Consider an exclusion size (should it zoom level dependent, rather than a fixed value?)
985 // When still near to the last saved position we'll jump over it to the one before
986 if ( vik_coord_diff ( center, &vvp->center ) > vvp->centers_radius ) {
988 if ( vvp->centers_index == g_list_length(vvp->centers)-1 ) {
989 // Only when we haven't already moved back in the list
990 // Remember where this request came from
991 // (alternatively we could insert in the list on every back attempt)
992 update_centers ( vvp );
996 // 'Go back' if possible
997 // NB if we inserted a position above, then this will then move to the last saved position
998 // otherwise this will skip to the previous saved position, as it's probably somewhere else.
999 if ( vvp->centers_index > 0 )
1000 vvp->centers_index--;
1006 VikCoord *new_center = g_list_nth_data ( vvp->centers, vvp->centers_index );
1008 vik_viewport_set_center_coord ( vvp, new_center, FALSE );
1015 * vik_viewport_go_forward:
1017 * Move forward in the position history
1019 * Returns: %TRUE one success
1021 gboolean vik_viewport_go_forward ( VikViewport *vvp )
1023 if ( vvp->centers_index == vvp->centers_max-1 )
1026 vvp->centers_index++;
1027 VikCoord *new_center = g_list_nth_data ( vvp->centers, vvp->centers_index );
1029 vik_viewport_set_center_coord ( vvp, new_center, FALSE );
1033 // Set to end of list
1034 vvp->centers_index = g_list_length(vvp->centers) - 1;
1040 * vik_viewport_back_available:
1042 * Returns: %TRUE when a previous position in the history is available
1044 gboolean vik_viewport_back_available ( const VikViewport *vvp )
1046 return ( vvp->centers_index > 0 );
1050 * vik_viewport_forward_available:
1052 * Returns: %TRUE when a next position in the history is available
1054 gboolean vik_viewport_forward_available ( const VikViewport *vvp )
1056 return ( vvp->centers_index < g_list_length(vvp->centers)-1 );
1060 * vik_viewport_set_center_latlon:
1061 * @vvp: The viewport to reposition.
1062 * @ll: The new center position in Lat/Lon format
1063 * @save_position: Whether this new position should be saved into the history of positions
1064 * Normally only specific user requests should be saved (i.e. to not include Pan and Zoom repositions)
1066 void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll, gboolean save_position )
1068 vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll );
1069 if ( save_position )
1070 update_centers ( vvp );
1071 if ( vvp->coord_mode == VIK_COORD_UTM )
1072 viewport_utm_zone_check ( vvp );
1076 * vik_viewport_set_center_utm:
1077 * @vvp: The viewport to reposition.
1078 * @utm: The new center position in UTM format
1079 * @save_position: Whether this new position should be saved into the history of positions
1080 * Normally only specific user requests should be saved (i.e. to not include Pan and Zoom repositions)
1082 void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm, gboolean save_position )
1084 vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm );
1085 if ( save_position )
1086 update_centers ( vvp );
1087 if ( vvp->coord_mode == VIK_COORD_UTM )
1088 viewport_utm_zone_check ( vvp );
1092 * vik_viewport_set_center_coord:
1093 * @vvp: The viewport to reposition.
1094 * @coord: The new center position in a VikCoord type
1095 * @save_position: Whether this new position should be saved into the history of positions
1096 * Normally only specific user requests should be saved (i.e. to not include Pan and Zoom repositions)
1098 void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord, gboolean save_position )
1100 vvp->center = *coord;
1101 if ( save_position )
1102 update_centers ( vvp );
1103 if ( vvp->coord_mode == VIK_COORD_UTM )
1104 viewport_utm_zone_check ( vvp );
1107 void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br )
1109 g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM );
1111 /* get center, then just offset */
1112 vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone );
1113 ul->mode = VIK_COORD_UTM;
1116 ul->north_south += (vvp->ympp * vvp->height / 2);
1117 ul->east_west -= (vvp->xmpp * vvp->width / 2);
1118 br->north_south -= (vvp->ympp * vvp->height / 2);
1119 br->east_west += (vvp->xmpp * vvp->width / 2);
1122 void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone)
1124 if ( vvp->coord_mode == VIK_COORD_UTM ) {
1125 *center = *((struct UTM *)(vik_viewport_get_center ( vvp )));
1126 center->easting -= ( zone - center->zone ) * vvp->utm_zone_width;
1127 center->zone = zone;
1131 gchar vik_viewport_leftmost_zone ( VikViewport *vvp )
1133 if ( vvp->coord_mode == VIK_COORD_UTM ) {
1135 g_assert ( vvp != NULL );
1136 vik_viewport_screen_to_coord ( vvp, 0, 0, &coord );
1137 return coord.utm_zone;
1142 gchar vik_viewport_rightmost_zone ( VikViewport *vvp )
1144 if ( vvp->coord_mode == VIK_COORD_UTM ) {
1146 g_assert ( vvp != NULL );
1147 vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord );
1148 return coord.utm_zone;
1154 void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y )
1156 g_return_if_fail ( vvp != NULL );
1157 if ( vvp->coord_mode == VIK_COORD_UTM ) {
1158 /* slightly optimized */
1159 vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2));
1160 vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y);
1161 viewport_utm_zone_check ( vvp );
1164 vik_viewport_screen_to_coord ( vvp, x, y, &tmp );
1165 vik_viewport_set_center_coord ( vvp, &tmp, FALSE );
1169 gint vik_viewport_get_width( VikViewport *vvp )
1171 g_return_val_if_fail ( vvp != NULL, 0 );
1175 gint vik_viewport_get_height( VikViewport *vvp )
1177 g_return_val_if_fail ( vvp != NULL, 0 );
1181 void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord )
1183 g_return_if_fail ( vvp != NULL );
1185 if ( vvp->coord_mode == VIK_COORD_UTM ) {
1187 struct UTM *utm = (struct UTM *) coord;
1188 coord->mode = VIK_COORD_UTM;
1190 utm->zone = vvp->center.utm_zone;
1191 utm->letter = vvp->center.utm_letter;
1192 utm->easting = ( ( x - ( vvp->width_2) ) * vvp->xmpp ) + vvp->center.east_west;
1193 zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 );
1194 utm->zone += zone_delta;
1195 utm->easting -= zone_delta * vvp->utm_zone_width;
1196 utm->northing = ( ( ( vvp->height_2) - y ) * vvp->ympp ) + vvp->center.north_south;
1197 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
1198 coord->mode = VIK_COORD_LATLON;
1199 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
1200 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width_2));
1201 coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height_2 - y));
1202 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA )
1203 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);
1204 else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
1205 /* This isn't called with a high frequently so less need to optimize */
1206 coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width_2));
1207 coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height_2 - y)) );
1213 * Since this function is used for every drawn trackpoint - it can get called alot
1214 * Thus x & y position factors are calculated once on zoom changes,
1215 * avoiding the need to do it here all the time.
1216 * For good measure the half width and height values are also pre calculated too.
1218 void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y )
1220 static VikCoord tmp;
1221 g_return_if_fail ( vvp != NULL );
1223 if ( coord->mode != vvp->coord_mode )
1225 g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!");
1226 vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp );
1230 if ( vvp->coord_mode == VIK_COORD_UTM ) {
1231 struct UTM *center = (struct UTM *) &(vvp->center);
1232 struct UTM *utm = (struct UTM *) coord;
1233 if ( center->zone != utm->zone && vvp->one_utm_zone )
1235 *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE;
1239 *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width_2) -
1240 (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp;
1241 *y = (vvp->height_2) - ( (utm->northing - center->northing) / vvp->ympp );
1242 } else if ( vvp->coord_mode == VIK_COORD_LATLON ) {
1243 struct LatLon *center = (struct LatLon *) &(vvp->center);
1244 struct LatLon *ll = (struct LatLon *) coord;
1246 if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_LATLON ) {
1247 *x = vvp->width_2 + ( MERCATOR_FACTOR(vvp->xmpp) * (ll->lon - center->lon) );
1248 *y = vvp->height_2 + ( MERCATOR_FACTOR(vvp->ympp) * (center->lat - ll->lat) );
1249 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) {
1250 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 );
1252 } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) {
1253 *x = vvp->width_2 + ( MERCATOR_FACTOR(vvp->xmpp) * (ll->lon - center->lon) );
1254 *y = vvp->height_2 + ( MERCATOR_FACTOR(vvp->ympp) * ( MERCLAT(center->lat) - MERCLAT(ll->lat) ) );
1259 // Clip functions continually reduce the value by a factor until it is in the acceptable range
1260 // whilst also scaling the other coordinate value.
1261 static void clip_x ( gint *x1, gint *y1, gint *x2, gint *y2 )
1263 while ( ABS(*x1) > 32768 ) {
1264 *x1 = *x2 + (0.5 * (*x1-*x2));
1265 *y1 = *y2 + (0.5 * (*y1-*y2));
1269 static void clip_y ( gint *x1, gint *y1, gint *x2, gint *y2 )
1271 while ( ABS(*y1) > 32767 ) {
1272 *x1 = *x2 + (0.5 * (*x1-*x2));
1273 *y1 = *y2 + (0.5 * (*y1-*y2));
1278 * a_viewport_clip_line:
1284 * Due to the seemingly undocumented behaviour of gdk_draw_line(), we need to restrict the range of values passed in.
1285 * So despite it accepting gints, the effective range seems to be the actually the minimum C int range (2^16).
1286 * This seems to be limitations coming from the X Window System.
1288 * See http://www.rahul.net/kenton/40errs.html
1289 * ERROR 7. Boundary conditions.
1290 * "The X coordinate space is not infinite.
1291 * Most drawing functions limit position, width, and height to 16 bit integers (sometimes signed, sometimes unsigned) of accuracy.
1292 * Because most C compilers use 32 bit integers, Xlib will not complain if you exceed the 16 bit limit, but your results will usually not be what you expected.
1293 * You should be especially careful of this if you are implementing higher level scalable graphics packages."
1295 * This function should be called before calling gdk_draw_line().
1297 void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 )
1299 if ( *x1 > 32768 || *x1 < -32767 )
1300 clip_x ( x1, y1, x2, y2 );
1301 if ( *y1 > 32768 || *y1 < -32767 )
1302 clip_y ( x1, y1, x2, y2 );
1303 if ( *x2 > 32768 || *x2 < -32767 )
1304 clip_x ( x2, y2, x1, y1 );
1305 if ( *y2 > 32768 || *y2 < -32767 )
1306 clip_y ( x2, y2, x1, y1 );
1309 void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 )
1311 if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) ||
1312 ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) {
1313 /*** clipping, yeah! ***/
1314 a_viewport_clip_line ( &x1, &y1, &x2, &y2 );
1315 gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2);
1319 void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 )
1321 // Using 32 as half the default waypoint image size, so this draws ensures the highlight gets done
1322 if ( x1 > -32 && x1 < vvp->width + 32 && y1 > -32 && y1 < vvp->height + 32 )
1323 gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2);
1326 void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string )
1328 if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 )
1329 gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string );
1332 /* shouldn't use this -- slow -- change the alpha channel instead. */
1333 void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha,
1334 gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h )
1336 gint real_dest_x = MAX(dest_x,0);
1337 gint real_dest_y = MAX(dest_y,0);
1340 return; /* don't waste your time */
1342 if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height )
1344 if ( vvp->alpha_pixbuf )
1345 g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) );
1346 vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width);
1347 vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height);
1348 vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height );
1351 w = MIN(w,vvp->width - dest_x);
1352 h = MIN(h,vvp->height - dest_y);
1354 /* check that we are drawing within boundaries. */
1355 src_x += (real_dest_x - dest_x);
1356 src_y += (real_dest_y - dest_y);
1357 w -= (real_dest_x - dest_x);
1358 h -= (real_dest_y - dest_y);
1360 gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL,
1361 real_dest_x, real_dest_y, 0, 0, w, h );
1363 /* do a composite */
1364 gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha );
1366 /* draw pixbuf_tmp */
1367 vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h );
1370 void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y,
1371 gint dest_x, gint dest_y, gint w, gint h )
1373 gdk_draw_pixbuf ( vvp->scr_buffer,
1376 src_x, src_y, dest_x, dest_y, w, h,
1377 GDK_RGB_DITHER_NONE, 0, 0 );
1380 void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 )
1382 gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 );
1386 void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints )
1388 gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints );
1391 VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp )
1394 return vvp->coord_mode;
1397 static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode )
1399 g_return_if_fail ( vvp != NULL );
1400 vvp->coord_mode = mode;
1401 vik_coord_convert ( &(vvp->center), mode );
1404 /* Thanks GPSDrive */
1405 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 )
1408 gdouble dif, lat, lon;
1409 double Ra = Radius[90+(gint)zero_lat];
1411 px = (mapSizeX2 - x) * pixelfact_x;
1412 py = (-mapSizeY2 + y) * pixelfact_y;
1414 lat = zero_lat - py / Ra;
1415 lat = zero_lat - py / Ra;
1419 cos (DEG2RAD(lat)));
1421 dif = lat * (1 - (cos (DEG2RAD(fabs (lon - zero_long)))));
1422 lat = lat - dif / 1.5;
1426 cos (DEG2RAD(lat)));
1433 /* Thanks GPSDrive */
1434 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 )
1438 gint mapSizeX = 2 * mapSizeX2;
1439 gint mapSizeY = 2 * mapSizeY2;
1441 g_assert ( lt >= -90.0 && lt <= 90.0 );
1442 // lg *= rad2deg; // FIXME, optimize equations
1444 Ra = Radius[90+(gint)lt];
1446 cos (DEG2RAD(lt)) * (lg - zero_long);
1447 *y = Ra * (lt - zero_lat);
1448 dif = Ra * RAD2DEG(1 - (cos ((DEG2RAD(lg - zero_long)))));
1449 *y = *y + dif / 1.85;
1450 *x = *x / pixelfact_x;
1451 *y = *y / pixelfact_y;
1452 *x = mapSizeX2 - *x;
1454 if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY))
1459 static void viewport_init_ra()
1461 static gboolean done_before = FALSE;
1465 for ( i = -90; i <= 90; i++)
1466 Radius[i+90] = calcR ( DEG2RAD((double)i) );
1471 double calcR (double lat)
1473 double a = 6378.137, r, sc, x, y, z;
1474 double e2 = 0.081082 * 0.081082;
1476 * the radius of curvature of an ellipsoidal Earth in the plane of the
1477 * meridian is given by
1479 * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2)
1482 * where a is the equatorial radius, b is the polar radius, and e is
1483 * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2)
1485 * a = 6378 km (3963 mi) Equatorial radius (surface to center distance)
1486 * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e
1487 * = 0.081082 Eccentricity
1493 z = 1.0 - e2 * sc * sc;
1500 gboolean vik_viewport_is_one_zone ( VikViewport *vvp )
1502 return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone;
1505 void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout )
1507 if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 )
1508 gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout );
1511 void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest )
1513 static GdkGCValues values;
1514 gdk_gc_get_values ( gc, &values );
1515 gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest );
1518 GdkFunction vik_gc_get_function ( GdkGC *gc )
1520 static GdkGCValues values;
1521 gdk_gc_get_values ( gc, &values );
1522 return values.function;
1525 void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode )
1527 vvp->drawmode = drawmode;
1528 if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM )
1529 viewport_set_coord_mode ( vvp, VIK_COORD_UTM );
1531 viewport_set_coord_mode ( vvp, VIK_COORD_LATLON );
1535 VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp )
1537 return vvp->drawmode;
1540 /******** triggering *******/
1541 void vik_viewport_set_trigger ( VikViewport *vp, gpointer trigger )
1543 vp->trigger = trigger;
1546 gpointer vik_viewport_get_trigger ( VikViewport *vp )
1551 void vik_viewport_snapshot_save ( VikViewport *vp )
1553 gdk_draw_drawable ( vp->snapshot_buffer, vp->background_gc, vp->scr_buffer, 0, 0, 0, 0, -1, -1 );
1556 void vik_viewport_snapshot_load ( VikViewport *vp )
1558 gdk_draw_drawable ( vp->scr_buffer, vp->background_gc, vp->snapshot_buffer, 0, 0, 0, 0, -1, -1 );
1561 void vik_viewport_set_half_drawn(VikViewport *vp, gboolean half_drawn)
1563 vp->half_drawn = half_drawn;
1566 gboolean vik_viewport_get_half_drawn( VikViewport *vp )
1568 return vp->half_drawn;
1572 const gchar *vik_viewport_get_drawmode_name(VikViewport *vv, VikViewportDrawMode mode)
1574 const gchar *name = NULL;
1575 VikWindow *vw = NULL;
1576 GtkWidget *mode_button;
1579 vw = VIK_WINDOW_FROM_WIDGET(vv);
1580 mode_button = vik_window_get_drawmode_button(vw, mode);
1581 label = gtk_bin_get_child(GTK_BIN(mode_button));
1583 name = gtk_label_get_text ( GTK_LABEL(label) );
1589 void vik_viewport_get_min_max_lat_lon ( VikViewport *vp, gdouble *min_lat, gdouble *max_lat, gdouble *min_lon, gdouble *max_lon )
1591 VikCoord tleft, tright, bleft, bright;
1593 vik_viewport_screen_to_coord ( vp, 0, 0, &tleft );
1594 vik_viewport_screen_to_coord ( vp, vik_viewport_get_width(vp), 0, &tright );
1595 vik_viewport_screen_to_coord ( vp, 0, vik_viewport_get_height(vp), &bleft );
1596 vik_viewport_screen_to_coord ( vp, vp->width, vp->height, &bright );
1598 vik_coord_convert(&tleft, VIK_COORD_LATLON);
1599 vik_coord_convert(&tright, VIK_COORD_LATLON);
1600 vik_coord_convert(&bleft, VIK_COORD_LATLON);
1601 vik_coord_convert(&bright, VIK_COORD_LATLON);
1603 *max_lat = MAX(tleft.north_south, tright.north_south);
1604 *min_lat = MIN(bleft.north_south, bright.north_south);
1605 *max_lon = MAX(tright.east_west, bright.east_west);
1606 *min_lon = MIN(tleft.east_west, bleft.east_west);
1609 void vik_viewport_reset_copyrights ( VikViewport *vp )
1611 g_return_if_fail ( vp != NULL );
1612 g_slist_foreach ( vp->copyrights, (GFunc)g_free, NULL );
1613 g_slist_free ( vp->copyrights );
1614 vp->copyrights = NULL;
1618 * vik_viewport_add_copyright:
1620 * @copyright: new copyright to display
1622 * Add a copyright to display on viewport.
1624 void vik_viewport_add_copyright ( VikViewport *vp, const gchar *copyright )
1626 g_return_if_fail ( vp != NULL );
1629 GSList *found = g_slist_find_custom ( vp->copyrights, copyright, (GCompareFunc)strcmp );
1630 if ( found == NULL )
1632 gchar *duple = g_strdup ( copyright );
1633 vp->copyrights = g_slist_prepend ( vp->copyrights, duple );
1638 void vik_viewport_reset_logos ( VikViewport *vp )
1640 g_return_if_fail ( vp != NULL );
1641 /* do not free elem */
1642 g_slist_free ( vp->logos );
1646 void vik_viewport_add_logo ( VikViewport *vp, const GdkPixbuf *logo )
1648 g_return_if_fail ( vp != NULL );
1651 GdkPixbuf *found = NULL; /* FIXME (GdkPixbuf*)g_slist_find_custom ( vp->logos, logo, (GCompareFunc)== ); */
1652 if ( found == NULL )
1654 vp->logos = g_slist_prepend ( vp->logos, (gpointer)logo );
1660 * vik_viewport_compute_bearing:
1666 * @angle: bearing in Radian (output)
1667 * @baseangle: UTM base angle in Radian (output)
1671 void vik_viewport_compute_bearing ( VikViewport *vp, gint x1, gint y1, gint x2, gint y2, gdouble *angle, gdouble *baseangle )
1673 gdouble len = sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2));
1674 gdouble dx = (x2-x1)/len*10;
1675 gdouble dy = (y2-y1)/len*10;
1677 *angle = atan2(dy, dx) + M_PI_2;
1679 if ( vik_viewport_get_drawmode ( vp ) == VIK_VIEWPORT_DRAWMODE_UTM) {
1685 vik_viewport_screen_to_coord ( vp, x1, y1, &test );
1686 vik_coord_to_latlon ( &test, &ll );
1687 ll.lat += vik_viewport_get_ympp ( vp ) * vik_viewport_get_height ( vp ) / 11000.0; // about 11km per degree latitude
1688 a_coords_latlon_to_utm ( &ll, &u );
1689 vik_coord_load_from_utm ( &test, VIK_VIEWPORT_DRAWMODE_UTM, &u );
1690 vik_viewport_coord_to_screen ( vp, &test, &tx, &ty );
1692 *baseangle = M_PI - atan2(tx-x1, ty-y1);
1693 *angle -= *baseangle;
1698 if (*angle > 2*M_PI)