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1 | /* | |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net> | |
5 | * | |
6 | * Lat/Lon plotting functions calcxy* are from GPSDrive | |
7 | * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at> | |
8 | * | |
9 | * Multiple UTM zone patch by Kit Transue <notlostyet@didactek.com> | |
10 | * | |
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. | |
15 | * | |
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. | |
20 | * | |
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 | |
24 | * | |
25 | */ | |
26 | ||
27 | #define DEFAULT_BACKGROUND_COLOR "#CCCCCC" | |
28 | ||
29 | #include <gtk/gtk.h> | |
30 | #include <math.h> | |
31 | #include <stdio.h> | |
32 | ||
33 | #include "coords.h" | |
34 | #include "vikcoord.h" | |
35 | #include "vikviewport.h" | |
36 | ||
37 | #include "mapcoord.h" | |
38 | ||
39 | /* for ALTI_TO_MPP */ | |
40 | #include "globals.h" | |
41 | #include "googlemaps.h" | |
42 | #include "khmaps.h" | |
43 | ||
44 | static gdouble EASTING_OFFSET = 500000.0; | |
45 | ||
46 | static void viewport_class_init ( VikViewportClass *klass ); | |
47 | static void viewport_init ( VikViewport *vvp ); | |
48 | static void viewport_finalize ( GObject *gob ); | |
49 | static void viewport_utm_zone_check ( VikViewport *vvp ); | |
50 | ||
51 | 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 ); | |
52 | 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 ); | |
53 | double calcR (double lat); | |
54 | ||
55 | static double Radius[181]; | |
56 | static void viewport_init_ra(); | |
57 | ||
58 | static GObjectClass *parent_class; | |
59 | ||
60 | static void viewport_google_rezoom ( VikViewport *vvp ); | |
61 | ||
62 | ||
63 | struct _VikViewport { | |
64 | GtkDrawingArea drawing_area; | |
65 | GdkPixmap *scr_buffer; | |
66 | gint width, height; | |
67 | VikCoord center; | |
68 | VikCoordMode coord_mode; | |
69 | gdouble xmpp, ympp; | |
70 | ||
71 | GdkPixbuf *alpha_pixbuf; | |
72 | guint8 alpha_pixbuf_width; | |
73 | guint8 alpha_pixbuf_height; | |
74 | ||
75 | gdouble utm_zone_width; | |
76 | gboolean one_utm_zone; | |
77 | ||
78 | GdkGC *background_gc; | |
79 | GdkColor background_color; | |
80 | GdkGC *scale_bg_gc; | |
81 | gboolean draw_scale; | |
82 | gboolean draw_centermark; | |
83 | ||
84 | /* subset of coord types. lat lon can be plotted in 2 ways, google or exp. */ | |
85 | VikViewportDrawMode drawmode; | |
86 | ||
87 | /* handy conversion factors which make google plotting extremely fast */ | |
88 | gdouble google_calcx_fact; | |
89 | gdouble google_calcy_fact; | |
90 | gdouble google_calcx_rev_fact; | |
91 | gdouble google_calcy_rev_fact; | |
92 | }; | |
93 | ||
94 | static gdouble | |
95 | viewport_utm_zone_width ( VikViewport *vvp ) | |
96 | { | |
97 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
98 | struct LatLon ll; | |
99 | ||
100 | /* get latitude of screen bottom */ | |
101 | struct UTM utm = *((struct UTM *)(vik_viewport_get_center ( vvp ))); | |
102 | utm.northing -= vvp -> height * vvp -> ympp / 2; | |
103 | a_coords_utm_to_latlon ( &utm, &ll ); | |
104 | ||
105 | /* boundary */ | |
106 | ll.lon = (utm.zone - 1) * 6 - 180 ; | |
107 | a_coords_latlon_to_utm ( &ll, &utm); | |
108 | return fabs ( utm.easting - EASTING_OFFSET ) * 2; | |
109 | } else | |
110 | return 0.0; | |
111 | } | |
112 | ||
113 | ||
114 | GType vik_viewport_get_type (void) | |
115 | { | |
116 | static GType vvp_type = 0; | |
117 | ||
118 | if (!vvp_type) | |
119 | { | |
120 | static const GTypeInfo vvp_info = | |
121 | { | |
122 | sizeof (VikViewportClass), | |
123 | NULL, /* base_init */ | |
124 | NULL, /* base_finalize */ | |
125 | (GClassInitFunc) viewport_class_init, | |
126 | NULL, /* class_finalize */ | |
127 | NULL, /* class_data */ | |
128 | sizeof (VikViewport), | |
129 | 0, | |
130 | (GInstanceInitFunc) viewport_init, | |
131 | }; | |
132 | vvp_type = g_type_register_static ( GTK_TYPE_DRAWING_AREA, "VikViewport", &vvp_info, 0 ); | |
133 | } | |
134 | return vvp_type; | |
135 | } | |
136 | ||
137 | static void viewport_class_init ( VikViewportClass *klass ) | |
138 | { | |
139 | /* Destructor */ | |
140 | GObjectClass *object_class; | |
141 | ||
142 | object_class = G_OBJECT_CLASS (klass); | |
143 | ||
144 | object_class->finalize = viewport_finalize; | |
145 | ||
146 | parent_class = g_type_class_peek_parent (klass); | |
147 | } | |
148 | ||
149 | VikViewport *vik_viewport_new () | |
150 | { | |
151 | return VIK_VIEWPORT ( g_object_new ( VIK_VIEWPORT_TYPE, NULL ) ); | |
152 | } | |
153 | ||
154 | static void viewport_init ( VikViewport *vvp ) | |
155 | { | |
156 | viewport_init_ra(); | |
157 | ||
158 | /* TODO: not static */ | |
159 | vvp->xmpp = 4.0; | |
160 | vvp->ympp = 4.0; | |
161 | vvp->coord_mode = VIK_COORD_UTM; | |
162 | vvp->drawmode = VIK_VIEWPORT_DRAWMODE_UTM; | |
163 | vvp->center.north_south = 0; | |
164 | vvp->center.east_west = -166021; | |
165 | vvp->center.utm_zone = 31; | |
166 | vvp->center.utm_letter = 'N'; | |
167 | vvp->scr_buffer = NULL; | |
168 | vvp->alpha_pixbuf = NULL; | |
169 | vvp->alpha_pixbuf_width = vvp->alpha_pixbuf_height = 0; | |
170 | vvp->utm_zone_width = 0.0; | |
171 | vvp->background_gc = NULL; | |
172 | vvp->scale_bg_gc = NULL; | |
173 | vvp->draw_scale = TRUE; | |
174 | vvp->draw_centermark = TRUE; | |
175 | g_signal_connect (G_OBJECT(vvp), "configure_event", G_CALLBACK(vik_viewport_configure), NULL); | |
176 | } | |
177 | ||
178 | GdkColor *vik_viewport_get_background_gdkcolor ( VikViewport *vvp ) | |
179 | { | |
180 | GdkColor *rv = g_malloc ( sizeof ( GdkColor ) ); | |
181 | *rv = vvp->background_color; | |
182 | return rv; | |
183 | } | |
184 | ||
185 | /* returns pointer to internal static storage, changes next time function called, use quickly */ | |
186 | const gchar *vik_viewport_get_background_color ( VikViewport *vvp ) | |
187 | { | |
188 | static gchar color[8]; | |
189 | 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)); | |
190 | return color; | |
191 | } | |
192 | ||
193 | void vik_viewport_set_background_color ( VikViewport *vvp, const gchar *colorname ) | |
194 | { | |
195 | g_assert ( vvp->background_gc ); | |
196 | gdk_color_parse ( colorname, &(vvp->background_color) ); | |
197 | gdk_gc_set_rgb_fg_color ( vvp->background_gc, &(vvp->background_color) ); | |
198 | } | |
199 | ||
200 | void vik_viewport_set_background_gdkcolor ( VikViewport *vvp, GdkColor *color ) | |
201 | { | |
202 | g_assert ( vvp->background_gc ); | |
203 | vvp->background_color = *color; | |
204 | gdk_gc_set_rgb_fg_color ( vvp->background_gc, color ); | |
205 | } | |
206 | ||
207 | ||
208 | GdkGC *vik_viewport_new_gc ( VikViewport *vvp, const gchar *colorname, gint thickness ) | |
209 | { | |
210 | GdkGC *rv; | |
211 | GdkColor color; | |
212 | ||
213 | rv = gdk_gc_new ( GTK_WIDGET(vvp)->window ); | |
214 | gdk_color_parse ( colorname, &color ); | |
215 | gdk_gc_set_rgb_fg_color ( rv, &color ); | |
216 | gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND ); | |
217 | return rv; | |
218 | } | |
219 | ||
220 | GdkGC *vik_viewport_new_gc_from_color ( VikViewport *vvp, GdkColor *color, gint thickness ) | |
221 | { | |
222 | GdkGC *rv; | |
223 | ||
224 | rv = gdk_gc_new ( GTK_WIDGET(vvp)->window ); | |
225 | gdk_gc_set_rgb_fg_color ( rv, color ); | |
226 | gdk_gc_set_line_attributes ( rv, thickness, GDK_LINE_SOLID, GDK_CAP_ROUND, GDK_JOIN_ROUND ); | |
227 | return rv; | |
228 | } | |
229 | ||
230 | void vik_viewport_configure_manually ( VikViewport *vvp, gint width, guint height ) | |
231 | { | |
232 | vvp->width = width; | |
233 | vvp->height = height; | |
234 | if ( vvp->scr_buffer ) | |
235 | g_object_unref ( G_OBJECT ( vvp->scr_buffer ) ); | |
236 | vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 ); | |
237 | } | |
238 | ||
239 | ||
240 | GdkPixmap *vik_viewport_get_pixmap ( VikViewport *vvp ) | |
241 | { | |
242 | return vvp->scr_buffer; | |
243 | } | |
244 | ||
245 | gboolean vik_viewport_configure ( VikViewport *vvp ) | |
246 | { | |
247 | g_return_val_if_fail ( vvp != NULL, TRUE ); | |
248 | ||
249 | vvp->width = GTK_WIDGET(vvp)->allocation.width; | |
250 | vvp->height = GTK_WIDGET(vvp)->allocation.height; | |
251 | ||
252 | if ( vvp->scr_buffer ) | |
253 | g_object_unref ( G_OBJECT ( vvp->scr_buffer ) ); | |
254 | ||
255 | vvp->scr_buffer = gdk_pixmap_new ( GTK_WIDGET(vvp)->window, vvp->width, vvp->height, -1 ); | |
256 | ||
257 | /* this is down here so it can get a GC (necessary?) */ | |
258 | if ( ! vvp->background_gc ) | |
259 | { | |
260 | vvp->background_gc = vik_viewport_new_gc ( vvp, "", 1 ); | |
261 | vik_viewport_set_background_color ( vvp, DEFAULT_BACKGROUND_COLOR ); /* set to "backup" color in vvp->background_color */ | |
262 | } | |
263 | if ( !vvp->scale_bg_gc) { | |
264 | vvp->scale_bg_gc = vik_viewport_new_gc(vvp, "grey", 3); | |
265 | } | |
266 | ||
267 | return FALSE; | |
268 | } | |
269 | ||
270 | static void viewport_finalize ( GObject *gob ) | |
271 | { | |
272 | VikViewport *vvp = VIK_VIEWPORT(gob); | |
273 | ||
274 | g_return_if_fail ( vvp != NULL ); | |
275 | ||
276 | if ( vvp->scr_buffer ) | |
277 | g_object_unref ( G_OBJECT ( vvp->scr_buffer ) ); | |
278 | ||
279 | if ( vvp->alpha_pixbuf ) | |
280 | g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) ); | |
281 | ||
282 | if ( vvp->background_gc ) | |
283 | g_object_unref ( G_OBJECT ( vvp->background_gc ) ); | |
284 | ||
285 | if ( vvp->scale_bg_gc ) { | |
286 | g_object_unref ( G_OBJECT ( vvp->scale_bg_gc ) ); | |
287 | vvp->scale_bg_gc = NULL; | |
288 | } | |
289 | ||
290 | G_OBJECT_CLASS(parent_class)->finalize(gob); | |
291 | } | |
292 | ||
293 | void vik_viewport_clear ( VikViewport *vvp ) | |
294 | { | |
295 | g_return_if_fail ( vvp != NULL ); | |
296 | gdk_draw_rectangle(GDK_DRAWABLE(vvp->scr_buffer), vvp->background_gc, TRUE, 0, 0, vvp->width, vvp->height); | |
297 | } | |
298 | ||
299 | void vik_viewport_set_draw_scale ( VikViewport *vvp, gboolean draw_scale ) | |
300 | { | |
301 | vvp->draw_scale = draw_scale; | |
302 | } | |
303 | ||
304 | gboolean vik_viewport_get_draw_scale ( VikViewport *vvp ) | |
305 | { | |
306 | return vvp->draw_scale; | |
307 | } | |
308 | ||
309 | void vik_viewport_draw_scale ( VikViewport *vvp ) | |
310 | { | |
311 | if ( vvp->draw_scale ) { | |
312 | VikCoord left, right; | |
313 | gdouble unit, base, diff, old_unit, old_diff, ratio; | |
314 | gint odd, len, PAD = 10, SCSIZE = 5, HEIGHT=10; | |
315 | PangoFontDescription *pfd; | |
316 | PangoLayout *pl; | |
317 | gchar s[128]; | |
318 | ||
319 | g_return_if_fail ( vvp != NULL ); | |
320 | ||
321 | vik_viewport_screen_to_coord ( vvp, 0, vvp->height, &left ); | |
322 | vik_viewport_screen_to_coord ( vvp, vvp->width/SCSIZE, vvp->height, &right ); | |
323 | ||
324 | base = vik_coord_diff ( &left, &right ); // in meters | |
325 | ratio = (vvp->width/SCSIZE)/base; | |
326 | ||
327 | unit = 1; | |
328 | diff = fabs(base-unit); | |
329 | old_unit = unit; | |
330 | old_diff = diff; | |
331 | odd = 1; | |
332 | while (diff <= old_diff) { | |
333 | old_unit = unit; | |
334 | old_diff = diff; | |
335 | unit = unit * (odd%2 ? 5 : 2); | |
336 | diff = fabs(base-unit); | |
337 | odd++; | |
338 | } | |
339 | unit = old_unit; | |
340 | len = unit * ratio; | |
341 | ||
342 | /* white background */ | |
343 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, | |
344 | PAD, vvp->height-PAD, PAD + len, vvp->height-PAD); | |
345 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, | |
346 | PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT); | |
347 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, | |
348 | PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT); | |
349 | /* black scale */ | |
350 | vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc, | |
351 | PAD, vvp->height-PAD, PAD + len, vvp->height-PAD); | |
352 | vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc, | |
353 | PAD, vvp->height-PAD, PAD, vvp->height-PAD-HEIGHT); | |
354 | vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc, | |
355 | PAD + len, vvp->height-PAD, PAD + len, vvp->height-PAD-HEIGHT); | |
356 | if (odd%2) { | |
357 | int i; | |
358 | for (i=1; i<5; i++) { | |
359 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, | |
360 | PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2))); | |
361 | vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc, | |
362 | PAD+i*len/5, vvp->height-PAD, PAD+i*len/5, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2))); | |
363 | } | |
364 | } else { | |
365 | int i; | |
366 | for (i=1; i<10; i++) { | |
367 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, | |
368 | PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2))); | |
369 | vik_viewport_draw_line(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc, | |
370 | PAD+i*len/10, vvp->height-PAD, PAD+i*len/10, vvp->height-PAD-((i==5)?(2*HEIGHT/3):(HEIGHT/2))); | |
371 | } | |
372 | } | |
373 | pl = gtk_widget_create_pango_layout (GTK_WIDGET(&vvp->drawing_area), NULL); | |
374 | pfd = pango_font_description_from_string ("Sans 8"); // FIXME: settable option? global variable? | |
375 | pango_layout_set_font_description (pl, pfd); | |
376 | pango_font_description_free (pfd); | |
377 | ||
378 | if (unit >= 1000) { | |
379 | sprintf(s, "%d km", (int)unit/1000); | |
380 | } else { | |
381 | sprintf(s, "%d m", (int)unit); | |
382 | } | |
383 | pango_layout_set_text(pl, s, -1); | |
384 | vik_viewport_draw_layout(vvp, GTK_WIDGET(&vvp->drawing_area)->style->black_gc, | |
385 | PAD + len + PAD, vvp->height - PAD - 10, pl); | |
386 | } | |
387 | } | |
388 | ||
389 | void vik_viewport_set_draw_centermark ( VikViewport *vvp, gboolean draw_centermark ) | |
390 | { | |
391 | vvp->draw_centermark = draw_centermark; | |
392 | } | |
393 | ||
394 | gboolean vik_viewport_get_draw_centermark ( VikViewport *vvp ) | |
395 | { | |
396 | return vvp->draw_centermark; | |
397 | } | |
398 | ||
399 | void vik_viewport_draw_centermark ( VikViewport *vvp ) | |
400 | { | |
401 | if ( !vvp->draw_centermark ) | |
402 | return; | |
403 | ||
404 | const int len = 30; | |
405 | const int gap = 4; | |
406 | int center_x = vvp->width/2; | |
407 | int center_y = vvp->height/2; | |
408 | GdkGC * black_gc = GTK_WIDGET(&vvp->drawing_area)->style->black_gc; | |
409 | ||
410 | /* white back ground */ | |
411 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x - len, center_y, center_x - gap, center_y); | |
412 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x + gap, center_y, center_x + len, center_y); | |
413 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y - len, center_x, center_y - gap); | |
414 | vik_viewport_draw_line(vvp, vvp->scale_bg_gc, center_x, center_y + gap, center_x, center_y + len); | |
415 | /* black fore ground */ | |
416 | vik_viewport_draw_line(vvp, black_gc, center_x - len, center_y, center_x - gap, center_y); | |
417 | vik_viewport_draw_line(vvp, black_gc, center_x + gap, center_y, center_x + len, center_y); | |
418 | vik_viewport_draw_line(vvp, black_gc, center_x, center_y - len, center_x, center_y - gap); | |
419 | vik_viewport_draw_line(vvp, black_gc, center_x, center_y + gap, center_x, center_y + len); | |
420 | ||
421 | } | |
422 | ||
423 | void vik_viewport_sync ( VikViewport *vvp ) | |
424 | { | |
425 | g_return_if_fail ( vvp != NULL ); | |
426 | 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); | |
427 | } | |
428 | ||
429 | void vik_viewport_pan_sync ( VikViewport *vvp, gint x_off, gint y_off ) | |
430 | { | |
431 | gint x, y, wid, hei; | |
432 | ||
433 | g_return_if_fail ( vvp != NULL ); | |
434 | 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); | |
435 | ||
436 | if (x_off >= 0) { | |
437 | x = 0; | |
438 | wid = x_off; | |
439 | } else { | |
440 | x = vvp->width+x_off; | |
441 | wid = -x_off; | |
442 | } | |
443 | if (y_off >= 0) { | |
444 | y = 0; | |
445 | hei = y_off; | |
446 | } else { | |
447 | y = vvp->height+y_off; | |
448 | hei = -y_off; | |
449 | } | |
450 | gtk_widget_queue_draw_area(GTK_WIDGET(vvp), x, 0, wid, vvp->height); | |
451 | gtk_widget_queue_draw_area(GTK_WIDGET(vvp), 0, y, vvp->width, hei); | |
452 | } | |
453 | ||
454 | void vik_viewport_set_zoom ( VikViewport *vvp, gdouble xympp ) | |
455 | { | |
456 | g_return_if_fail ( vvp != NULL ); | |
457 | if ( xympp >= VIK_VIEWPORT_MIN_ZOOM && xympp <= VIK_VIEWPORT_MAX_ZOOM ) | |
458 | vvp->xmpp = vvp->ympp = xympp; | |
459 | ||
460 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM ) | |
461 | viewport_utm_zone_check(vvp); | |
462 | else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) | |
463 | viewport_google_rezoom ( vvp ); | |
464 | } | |
465 | ||
466 | /* or could do factor */ | |
467 | void vik_viewport_zoom_in ( VikViewport *vvp ) | |
468 | { | |
469 | g_return_if_fail ( vvp != NULL ); | |
470 | if ( vvp->xmpp >= (VIK_VIEWPORT_MIN_ZOOM*2) && vvp->ympp >= (VIK_VIEWPORT_MIN_ZOOM*2) ) | |
471 | { | |
472 | vvp->xmpp /= 2; | |
473 | vvp->ympp /= 2; | |
474 | ||
475 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) | |
476 | viewport_google_rezoom ( vvp ); | |
477 | ||
478 | viewport_utm_zone_check(vvp); | |
479 | } | |
480 | } | |
481 | ||
482 | void vik_viewport_zoom_out ( VikViewport *vvp ) | |
483 | { | |
484 | g_return_if_fail ( vvp != NULL ); | |
485 | if ( vvp->xmpp <= (VIK_VIEWPORT_MAX_ZOOM/2) && vvp->ympp <= (VIK_VIEWPORT_MAX_ZOOM/2) ) | |
486 | { | |
487 | vvp->xmpp *= 2; | |
488 | vvp->ympp *= 2; | |
489 | ||
490 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) | |
491 | viewport_google_rezoom ( vvp ); | |
492 | ||
493 | viewport_utm_zone_check(vvp); | |
494 | } | |
495 | } | |
496 | ||
497 | gdouble vik_viewport_get_zoom ( VikViewport *vvp ) | |
498 | { | |
499 | if ( vvp->xmpp == vvp->ympp ) | |
500 | return vvp->xmpp; | |
501 | return 0.0; | |
502 | } | |
503 | ||
504 | gdouble vik_viewport_get_xmpp ( VikViewport *vvp ) | |
505 | { | |
506 | return vvp->xmpp; | |
507 | } | |
508 | ||
509 | gdouble vik_viewport_get_ympp ( VikViewport *vvp ) | |
510 | { | |
511 | return vvp->ympp; | |
512 | } | |
513 | ||
514 | void vik_viewport_set_xmpp ( VikViewport *vvp, gdouble xmpp ) | |
515 | { | |
516 | if ( xmpp >= VIK_VIEWPORT_MIN_ZOOM && xmpp <= VIK_VIEWPORT_MAX_ZOOM ) { | |
517 | vvp->xmpp = xmpp; | |
518 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM ) | |
519 | viewport_utm_zone_check(vvp); | |
520 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) | |
521 | viewport_google_rezoom ( vvp ); | |
522 | } | |
523 | } | |
524 | ||
525 | void vik_viewport_set_ympp ( VikViewport *vvp, gdouble ympp ) | |
526 | { | |
527 | if ( ympp >= VIK_VIEWPORT_MIN_ZOOM && ympp <= VIK_VIEWPORT_MAX_ZOOM ) { | |
528 | vvp->ympp = ympp; | |
529 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_UTM ) | |
530 | viewport_utm_zone_check(vvp); | |
531 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) | |
532 | viewport_google_rezoom ( vvp ); | |
533 | } | |
534 | } | |
535 | ||
536 | ||
537 | const VikCoord *vik_viewport_get_center ( VikViewport *vvp ) | |
538 | { | |
539 | g_return_val_if_fail ( vvp != NULL, NULL ); | |
540 | return &(vvp->center); | |
541 | } | |
542 | ||
543 | /* called every time we update coordinates/zoom */ | |
544 | static void viewport_utm_zone_check ( VikViewport *vvp ) | |
545 | { | |
546 | if ( vvp->coord_mode == VIK_COORD_UTM ) | |
547 | { | |
548 | struct UTM utm; | |
549 | struct LatLon ll; | |
550 | a_coords_utm_to_latlon ( (struct UTM *) &(vvp->center), &ll ); | |
551 | a_coords_latlon_to_utm ( &ll, &utm ); | |
552 | if ( utm.zone != vvp->center.utm_zone ) | |
553 | *((struct UTM *)(&vvp->center)) = utm; | |
554 | ||
555 | /* misc. stuff so we don't have to check later */ | |
556 | vvp->utm_zone_width = viewport_utm_zone_width ( vvp ); | |
557 | vvp->one_utm_zone = ( vik_viewport_rightmost_zone(vvp) == vik_viewport_leftmost_zone(vvp) ); | |
558 | } | |
559 | } | |
560 | ||
561 | void vik_viewport_set_center_latlon ( VikViewport *vvp, const struct LatLon *ll ) | |
562 | { | |
563 | vik_coord_load_from_latlon ( &(vvp->center), vvp->coord_mode, ll ); | |
564 | if ( vvp->coord_mode == VIK_COORD_UTM ) | |
565 | viewport_utm_zone_check ( vvp ); | |
566 | } | |
567 | ||
568 | void vik_viewport_set_center_utm ( VikViewport *vvp, const struct UTM *utm ) | |
569 | { | |
570 | vik_coord_load_from_utm ( &(vvp->center), vvp->coord_mode, utm ); | |
571 | if ( vvp->coord_mode == VIK_COORD_UTM ) | |
572 | viewport_utm_zone_check ( vvp ); | |
573 | } | |
574 | ||
575 | void vik_viewport_set_center_coord ( VikViewport *vvp, const VikCoord *coord ) | |
576 | { | |
577 | vvp->center = *coord; | |
578 | if ( vvp->coord_mode == VIK_COORD_UTM ) | |
579 | viewport_utm_zone_check ( vvp ); | |
580 | } | |
581 | ||
582 | void vik_viewport_corners_for_zonen ( VikViewport *vvp, int zone, VikCoord *ul, VikCoord *br ) | |
583 | { | |
584 | g_return_if_fail ( vvp->coord_mode == VIK_COORD_UTM ); | |
585 | ||
586 | /* get center, then just offset */ | |
587 | vik_viewport_center_for_zonen ( vvp, VIK_UTM(ul), zone ); | |
588 | ul->mode = VIK_COORD_UTM; | |
589 | *br = *ul; | |
590 | ||
591 | ul->north_south += (vvp->ympp * vvp->height / 2); | |
592 | ul->east_west -= (vvp->xmpp * vvp->width / 2); | |
593 | br->north_south -= (vvp->ympp * vvp->height / 2); | |
594 | br->east_west += (vvp->xmpp * vvp->width / 2); | |
595 | } | |
596 | ||
597 | void vik_viewport_center_for_zonen ( VikViewport *vvp, struct UTM *center, int zone) | |
598 | { | |
599 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
600 | *center = *((struct UTM *)(vik_viewport_get_center ( vvp ))); | |
601 | center->easting -= ( zone - center->zone ) * vvp->utm_zone_width; | |
602 | center->zone = zone; | |
603 | } | |
604 | } | |
605 | ||
606 | gchar vik_viewport_leftmost_zone ( VikViewport *vvp ) | |
607 | { | |
608 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
609 | VikCoord coord; | |
610 | g_assert ( vvp != NULL ); | |
611 | vik_viewport_screen_to_coord ( vvp, 0, 0, &coord ); | |
612 | return coord.utm_zone; | |
613 | } | |
614 | return '\0'; | |
615 | } | |
616 | ||
617 | gchar vik_viewport_rightmost_zone ( VikViewport *vvp ) | |
618 | { | |
619 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
620 | VikCoord coord; | |
621 | g_assert ( vvp != NULL ); | |
622 | vik_viewport_screen_to_coord ( vvp, vvp->width, 0, &coord ); | |
623 | return coord.utm_zone; | |
624 | } | |
625 | return '\0'; | |
626 | } | |
627 | ||
628 | ||
629 | void vik_viewport_set_center_screen ( VikViewport *vvp, int x, int y ) | |
630 | { | |
631 | g_return_if_fail ( vvp != NULL ); | |
632 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
633 | /* slightly optimized */ | |
634 | vvp->center.east_west += vvp->xmpp * (x - (vvp->width/2)); | |
635 | vvp->center.north_south += vvp->ympp * ((vvp->height/2) - y); | |
636 | viewport_utm_zone_check ( vvp ); | |
637 | } else { | |
638 | VikCoord tmp; | |
639 | vik_viewport_screen_to_coord ( vvp, x, y, &tmp ); | |
640 | vik_viewport_set_center_coord ( vvp, &tmp ); | |
641 | } | |
642 | } | |
643 | ||
644 | gint vik_viewport_get_width( VikViewport *vvp ) | |
645 | { | |
646 | g_return_val_if_fail ( vvp != NULL, 0 ); | |
647 | return vvp->width; | |
648 | } | |
649 | ||
650 | gint vik_viewport_get_height( VikViewport *vvp ) | |
651 | { | |
652 | g_return_val_if_fail ( vvp != NULL, 0 ); | |
653 | return vvp->height; | |
654 | } | |
655 | ||
656 | void vik_viewport_screen_to_coord ( VikViewport *vvp, int x, int y, VikCoord *coord ) | |
657 | { | |
658 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
659 | int zone_delta; | |
660 | struct UTM *utm = (struct UTM *) coord; | |
661 | coord->mode = VIK_COORD_UTM; | |
662 | ||
663 | g_return_if_fail ( vvp != NULL ); | |
664 | ||
665 | utm->zone = vvp->center.utm_zone; | |
666 | utm->letter = vvp->center.utm_letter; | |
667 | utm->easting = ( ( x - ( vvp->width / 2) ) * vvp->xmpp ) + vvp->center.east_west; | |
668 | zone_delta = floor( (utm->easting - EASTING_OFFSET ) / vvp->utm_zone_width + 0.5 ); | |
669 | utm->zone += zone_delta; | |
670 | utm->easting -= zone_delta * vvp->utm_zone_width; | |
671 | utm->northing = ( ( ( vvp->height / 2) - y ) * vvp->ympp ) + vvp->center.north_south; | |
672 | } else if ( vvp->coord_mode == VIK_COORD_LATLON ) { | |
673 | coord->mode = VIK_COORD_LATLON; | |
674 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) | |
675 | 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); | |
676 | else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) { | |
677 | /* google */ | |
678 | coord->east_west = (x - (vvp->width/2)) * vvp->google_calcx_rev_fact + vvp->center.east_west; | |
679 | coord->north_south = ((vvp->height/2) - y) * vvp->google_calcy_rev_fact + vvp->center.north_south; | |
680 | } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) { | |
681 | coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2)); | |
682 | coord->north_south = vvp->center.north_south + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)); | |
683 | } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) { | |
684 | /* FIXMERCATOR */ | |
685 | coord->east_west = vvp->center.east_west + (180.0 * vvp->xmpp / 65536 / 256 * (x - vvp->width/2)); | |
686 | coord->north_south = DEMERCLAT ( MERCLAT(vvp->center.north_south) + (180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) ); | |
687 | ||
688 | #if 0 | |
689 | --> THIS IS JUNK HERE. | |
690 | *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0; | |
691 | ||
692 | (*y - vvp->height/2) / 256 / 65536 * 180 * vvp->ympp = (MERCLAT(center->lat) - MERCLAT(ll->lat); | |
693 | DML((180.0 * vvp->ympp / 65536 / 256 * (vvp->height/2 - y)) + ML(cl)) = ll | |
694 | #endif | |
695 | } | |
696 | } | |
697 | } | |
698 | ||
699 | void vik_viewport_coord_to_screen ( VikViewport *vvp, const VikCoord *coord, int *x, int *y ) | |
700 | { | |
701 | static VikCoord tmp; | |
702 | g_return_if_fail ( vvp != NULL ); | |
703 | ||
704 | if ( coord->mode != vvp->coord_mode ) | |
705 | { | |
706 | g_warning ( "Have to convert in vik_viewport_coord_to_screen! This should never happen!"); | |
707 | vik_coord_copy_convert ( coord, vvp->coord_mode, &tmp ); | |
708 | coord = &tmp; | |
709 | } | |
710 | ||
711 | if ( vvp->coord_mode == VIK_COORD_UTM ) { | |
712 | struct UTM *center = (struct UTM *) &(vvp->center); | |
713 | struct UTM *utm = (struct UTM *) coord; | |
714 | if ( center->zone != utm->zone && vvp->one_utm_zone ) | |
715 | { | |
716 | *x = *y = VIK_VIEWPORT_UTM_WRONG_ZONE; | |
717 | return; | |
718 | } | |
719 | ||
720 | *x = ( (utm->easting - center->easting) / vvp->xmpp ) + (vvp->width / 2) - | |
721 | (center->zone - utm->zone ) * vvp->utm_zone_width / vvp->xmpp; | |
722 | *y = (vvp->height / 2) - ( (utm->northing - center->northing) / vvp->ympp ); | |
723 | } else if ( vvp->coord_mode == VIK_COORD_LATLON ) { | |
724 | struct LatLon *center = (struct LatLon *) &(vvp->center); | |
725 | struct LatLon *ll = (struct LatLon *) coord; | |
726 | double xx,yy; | |
727 | if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_EXPEDIA ) { | |
728 | 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 ); | |
729 | *x = xx; *y = yy; | |
730 | } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) { | |
731 | /* google */ | |
732 | *x = vvp->google_calcx_fact * (ll->lon - center->lon) + (vvp->width/2); | |
733 | *y = vvp->google_calcy_fact * (center->lat - ll->lat) + (vvp->height/2); | |
734 | } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_KH ) { | |
735 | /* subtract, convert to KH coords; blow it up by 256 */ | |
736 | *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0; | |
737 | *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (center->lat - ll->lat))*256.0; | |
738 | } else if ( vvp->drawmode == VIK_VIEWPORT_DRAWMODE_MERCATOR ) { | |
739 | /* FIXMERCATOR: Optimize */ | |
740 | *x = vvp->width/2 + (65536.0 / 180 / vvp->xmpp * (ll->lon - center->lon))*256.0; | |
741 | *y = vvp->height/2 + (65536.0 / 180 / vvp->ympp * (MERCLAT(center->lat) - MERCLAT(ll->lat)))*256.0; | |
742 | } | |
743 | } | |
744 | } | |
745 | ||
746 | void a_viewport_clip_line ( gint *x1, gint *y1, gint *x2, gint *y2 ) | |
747 | { | |
748 | if ( *x1 > 20000 || *x1 < -20000 ) { | |
749 | gdouble shrinkfactor = ABS(20000.0 / *x1); | |
750 | *x1 = *x2 + (shrinkfactor * (*x1-*x2)); | |
751 | *y1 = *y2 + (shrinkfactor * (*y1-*y2)); | |
752 | } else if ( *y1 > 20000 || *y1 < -20000 ) { | |
753 | gdouble shrinkfactor = ABS(20000.0 / *x1); | |
754 | *x1 = *x2 + (shrinkfactor * (*x1-*x2)); | |
755 | *y1 = *y2 + (shrinkfactor * (*y1-*y2)); | |
756 | } else if ( *x2 > 20000 || *x2 < -20000 ) { | |
757 | gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2); | |
758 | *x2 = *x1 + (shrinkfactor * (*x2-*x1)); | |
759 | *y2 = *y1 + (shrinkfactor * (*y2-*y1)); | |
760 | g_print("%f, %d, %d\n", shrinkfactor, *x2, *y2); | |
761 | } else if ( *y2 > 20000 || *y2 < -20000 ) { | |
762 | gdouble shrinkfactor = ABS(20000.0 / (gdouble)*x2); | |
763 | *x2 = *x1 + (shrinkfactor * (*x2-*x1)); | |
764 | *y2 = *y1 + (shrinkfactor * (*y2-*y1)); | |
765 | } | |
766 | } | |
767 | ||
768 | void vik_viewport_draw_line ( VikViewport *vvp, GdkGC *gc, gint x1, gint y1, gint x2, gint y2 ) | |
769 | { | |
770 | if ( ! ( ( x1 < 0 && x2 < 0 ) || ( y1 < 0 && y2 < 0 ) || | |
771 | ( x1 > vvp->width && x2 > vvp->width ) || ( y1 > vvp->height && y2 > vvp->height ) ) ) { | |
772 | /*** clipping, yeah! ***/ | |
773 | a_viewport_clip_line ( &x1, &y1, &x2, &y2 ); | |
774 | gdk_draw_line ( vvp->scr_buffer, gc, x1, y1, x2, y2); | |
775 | } | |
776 | } | |
777 | ||
778 | void vik_viewport_draw_rectangle ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x1, gint y1, gint x2, gint y2 ) | |
779 | { | |
780 | if ( x1 > -10 && x1 < vvp->width + 10 && y1 > -10 && y1 < vvp->height + 10 ) | |
781 | gdk_draw_rectangle ( vvp->scr_buffer, gc, filled, x1, y1, x2, y2); | |
782 | } | |
783 | ||
784 | void vik_viewport_draw_string ( VikViewport *vvp, GdkFont *font, GdkGC *gc, gint x1, gint y1, const gchar *string ) | |
785 | { | |
786 | if ( x1 > -100 && x1 < vvp->width + 100 && y1 > -100 && y1 < vvp->height + 100 ) | |
787 | gdk_draw_string ( vvp->scr_buffer, font, gc, x1, y1, string ); | |
788 | } | |
789 | ||
790 | /* shouldn't use this -- slow -- change the alpha channel instead. */ | |
791 | void vik_viewport_draw_pixbuf_with_alpha ( VikViewport *vvp, GdkPixbuf *pixbuf, gint alpha, | |
792 | gint src_x, gint src_y, gint dest_x, gint dest_y, gint w, gint h ) | |
793 | { | |
794 | gint real_dest_x = MAX(dest_x,0); | |
795 | gint real_dest_y = MAX(dest_y,0); | |
796 | ||
797 | if ( alpha == 0 ) | |
798 | return; /* don't waste your time */ | |
799 | ||
800 | if ( w > vvp->alpha_pixbuf_width || h > vvp->alpha_pixbuf_height ) | |
801 | { | |
802 | if ( vvp->alpha_pixbuf ) | |
803 | g_object_unref ( G_OBJECT ( vvp->alpha_pixbuf ) ); | |
804 | vvp->alpha_pixbuf_width = MAX(w,vvp->alpha_pixbuf_width); | |
805 | vvp->alpha_pixbuf_height = MAX(h,vvp->alpha_pixbuf_height); | |
806 | vvp->alpha_pixbuf = gdk_pixbuf_new ( GDK_COLORSPACE_RGB, FALSE, 8, vvp->alpha_pixbuf_width, vvp->alpha_pixbuf_height ); | |
807 | } | |
808 | ||
809 | w = MIN(w,vvp->width - dest_x); | |
810 | h = MIN(h,vvp->height - dest_y); | |
811 | ||
812 | /* check that we are drawing within boundaries. */ | |
813 | src_x += (real_dest_x - dest_x); | |
814 | src_y += (real_dest_y - dest_y); | |
815 | w -= (real_dest_x - dest_x); | |
816 | h -= (real_dest_y - dest_y); | |
817 | ||
818 | gdk_pixbuf_get_from_drawable ( vvp->alpha_pixbuf, vvp->scr_buffer, NULL, | |
819 | real_dest_x, real_dest_y, 0, 0, w, h ); | |
820 | ||
821 | /* do a composite */ | |
822 | gdk_pixbuf_composite ( pixbuf, vvp->alpha_pixbuf, 0, 0, w, h, -src_x, -src_y, 1, 1, 0, alpha ); | |
823 | ||
824 | /* draw pixbuf_tmp */ | |
825 | vik_viewport_draw_pixbuf ( vvp, vvp->alpha_pixbuf, 0, 0, real_dest_x, real_dest_y, w, h ); | |
826 | } | |
827 | ||
828 | void vik_viewport_draw_pixbuf ( VikViewport *vvp, GdkPixbuf *pixbuf, gint src_x, gint src_y, | |
829 | gint dest_x, gint dest_y, gint w, gint h ) | |
830 | { | |
831 | gdk_draw_pixbuf ( vvp->scr_buffer, | |
832 | // GTK_WIDGET(vvp)->style->black_gc, | |
833 | NULL, | |
834 | pixbuf, | |
835 | src_x, src_y, dest_x, dest_y, w, h, | |
836 | GDK_RGB_DITHER_NONE, 0, 0 ); | |
837 | } | |
838 | ||
839 | void vik_viewport_draw_arc ( VikViewport *vvp, GdkGC *gc, gboolean filled, gint x, gint y, gint width, gint height, gint angle1, gint angle2 ) | |
840 | { | |
841 | gdk_draw_arc ( vvp->scr_buffer, gc, filled, x, y, width, height, angle1, angle2 ); | |
842 | } | |
843 | ||
844 | ||
845 | void vik_viewport_draw_polygon ( VikViewport *vvp, GdkGC *gc, gboolean filled, GdkPoint *points, gint npoints ) | |
846 | { | |
847 | gdk_draw_polygon ( vvp->scr_buffer, gc, filled, points, npoints ); | |
848 | } | |
849 | ||
850 | VikCoordMode vik_viewport_get_coord_mode ( const VikViewport *vvp ) | |
851 | { | |
852 | g_assert ( vvp ); | |
853 | return vvp->coord_mode; | |
854 | } | |
855 | ||
856 | static void viewport_set_coord_mode ( VikViewport *vvp, VikCoordMode mode ) | |
857 | { | |
858 | g_return_if_fail ( vvp != NULL ); | |
859 | vvp->coord_mode = mode; | |
860 | vik_coord_convert ( &(vvp->center), mode ); | |
861 | } | |
862 | ||
863 | /* Thanks GPSDrive */ | |
864 | 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 ) | |
865 | { | |
866 | int px, py; | |
867 | gdouble dif, lat, lon; | |
868 | double Ra = Radius[90+(gint)zero_lat]; | |
869 | ||
870 | px = (mapSizeX2 - x) * pixelfact_x; | |
871 | py = (-mapSizeY2 + y) * pixelfact_y; | |
872 | ||
873 | lat = zero_lat - py / Ra; | |
874 | lat = zero_lat - py / Ra; | |
875 | lon = | |
876 | zero_long - | |
877 | px / (Ra * | |
878 | cos (lat * DEG2RAD)); | |
879 | ||
880 | dif = lat * (1 - (cos ((fabs (lon - zero_long)) * DEG2RAD))); | |
881 | lat = lat - dif / 1.5; | |
882 | lon = | |
883 | zero_long - | |
884 | px / (Ra * | |
885 | cos (lat * DEG2RAD)); | |
886 | ||
887 | *lt = lat; | |
888 | *lg = lon; | |
889 | return (TRUE); | |
890 | } | |
891 | ||
892 | /* Thanks GPSDrive */ | |
893 | 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 ) | |
894 | { | |
895 | double dif; | |
896 | double Ra; | |
897 | gint mapSizeX = 2 * mapSizeX2; | |
898 | gint mapSizeY = 2 * mapSizeY2; | |
899 | ||
900 | g_assert ( lt >= -90.0 && lt <= 90.0 ); | |
901 | // lg *= rad2deg; // FIXME, optimize equations | |
902 | // lt *= rad2deg; | |
903 | Ra = Radius[90+(gint)lt]; | |
904 | *x = Ra * | |
905 | cos (lt*DEG2RAD) * (lg - zero_long); | |
906 | *y = Ra * (lt - zero_lat); | |
907 | dif = Ra * RAD2DEG * (1 - (cos ((DEG2RAD * (lg - zero_long))))); | |
908 | *y = *y + dif / 1.85; | |
909 | *x = *x / pixelfact_x; | |
910 | *y = *y / pixelfact_y; | |
911 | *x = mapSizeX2 - *x; | |
912 | *y += mapSizeY2; | |
913 | if ((*x < 0)||(*x >= mapSizeX)||(*y < 0)||(*y >= mapSizeY)) | |
914 | return (FALSE); | |
915 | return (TRUE); | |
916 | } | |
917 | ||
918 | static void viewport_init_ra() | |
919 | { | |
920 | static gboolean done_before = FALSE; | |
921 | if ( !done_before ) | |
922 | { | |
923 | gint i; | |
924 | for ( i = -90; i <= 90; i++) | |
925 | Radius[i+90] = calcR ( (double)i ) * DEG2RAD; | |
926 | done_before = TRUE; | |
927 | } | |
928 | } | |
929 | ||
930 | double calcR (double lat) | |
931 | { | |
932 | double a = 6378.137, r, sc, x, y, z; | |
933 | double e2 = 0.081082 * 0.081082; | |
934 | /* | |
935 | * the radius of curvature of an ellipsoidal Earth in the plane of the | |
936 | * meridian is given by | |
937 | * | |
938 | * R' = a * (1 - e^2) / (1 - e^2 * (sin(lat))^2)^(3/2) | |
939 | * | |
940 | * | |
941 | * where a is the equatorial radius, b is the polar radius, and e is | |
942 | * the eccentricity of the ellipsoid = sqrt(1 - b^2/a^2) | |
943 | * | |
944 | * a = 6378 km (3963 mi) Equatorial radius (surface to center distance) | |
945 | * b = 6356.752 km (3950 mi) Polar radius (surface to center distance) e | |
946 | * = 0.081082 Eccentricity | |
947 | */ | |
948 | ||
949 | lat = lat * DEG2RAD; | |
950 | sc = sin (lat); | |
951 | x = a * (1.0 - e2); | |
952 | z = 1.0 - e2 * sc * sc; | |
953 | y = pow (z, 1.5); | |
954 | r = x / y; | |
955 | r = r * 1000.0; | |
956 | return r; | |
957 | } | |
958 | ||
959 | gboolean vik_viewport_is_one_zone ( VikViewport *vvp ) | |
960 | { | |
961 | return vvp->coord_mode == VIK_COORD_UTM && vvp->one_utm_zone; | |
962 | } | |
963 | ||
964 | void vik_viewport_draw_layout ( VikViewport *vvp, GdkGC *gc, gint x, gint y, PangoLayout *layout ) | |
965 | { | |
966 | if ( x > -100 && x < vvp->width + 100 && y > -100 && y < vvp->height + 100 ) | |
967 | gdk_draw_layout ( vvp->scr_buffer, gc, x, y, layout ); | |
968 | } | |
969 | ||
970 | void vik_gc_get_fg_color ( GdkGC *gc, GdkColor *dest ) | |
971 | { | |
972 | static GdkGCValues values; | |
973 | gdk_gc_get_values ( gc, &values ); | |
974 | gdk_colormap_query_color ( gdk_colormap_get_system(), values.foreground.pixel, dest ); | |
975 | } | |
976 | ||
977 | GdkFunction vik_gc_get_function ( GdkGC *gc ) | |
978 | { | |
979 | static GdkGCValues values; | |
980 | gdk_gc_get_values ( gc, &values ); | |
981 | return values.function; | |
982 | } | |
983 | ||
984 | void vik_viewport_set_drawmode ( VikViewport *vvp, VikViewportDrawMode drawmode ) | |
985 | { | |
986 | vvp->drawmode = drawmode; | |
987 | if ( drawmode == VIK_VIEWPORT_DRAWMODE_UTM ) | |
988 | viewport_set_coord_mode ( vvp, VIK_COORD_UTM ); | |
989 | else { | |
990 | viewport_set_coord_mode ( vvp, VIK_COORD_LATLON ); | |
991 | if ( drawmode == VIK_VIEWPORT_DRAWMODE_GOOGLE ) | |
992 | viewport_google_rezoom ( vvp ); | |
993 | } | |
994 | } | |
995 | ||
996 | VikViewportDrawMode vik_viewport_get_drawmode ( VikViewport *vvp ) | |
997 | { | |
998 | return vvp->drawmode; | |
999 | } | |
1000 | ||
1001 | static void viewport_google_rezoom ( VikViewport *vvp ) | |
1002 | { | |
1003 | vvp->google_calcx_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 * 0.7716245833877 / vvp->xmpp); | |
1004 | vvp->google_calcy_fact = (GOOGLEMAPS_ZOOM_ONE_MPP * 65536.0 / vvp->ympp); | |
1005 | vvp->google_calcx_rev_fact = 1 / vvp->google_calcx_fact; | |
1006 | vvp->google_calcy_rev_fact = 1 / vvp->google_calcy_fact; | |
1007 | } |