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1 | /* | |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2005, Evan Battaglia <viking@greentorch.org> | |
5 | * | |
6 | * Some formulas or perhaps even code derived from GPSDrive | |
7 | * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <gtk/gtk.h> | |
26 | #include <math.h> | |
27 | #include "globals.h" | |
28 | #include "coords.h" | |
29 | #include "vikcoord.h" | |
30 | #include "mapcoord.h" | |
31 | #include "download.h" | |
32 | #include "vikmapslayer.h" | |
33 | ||
34 | #include "expedia.h" | |
35 | ||
36 | static gboolean expedia_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ); | |
37 | static void expedia_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ); | |
38 | static int expedia_download ( MapCoord *src, const gchar *dest_fn ); | |
39 | ||
40 | void expedia_init() { | |
41 | VikMapsLayer_MapType map_type = { 5, 0, 0, VIK_VIEWPORT_DRAWMODE_EXPEDIA, expedia_coord_to_mapcoord, expedia_mapcoord_to_center_coord, expedia_download }; | |
42 | maps_layer_register_type("Expedia Street Maps", 5, &map_type); | |
43 | } | |
44 | ||
45 | #define EXPEDIA_SITE "expedia.com" | |
46 | #define MPP_MARGIN_OF_ERROR 0.01 | |
47 | #define DEGREES_TO_RADS 0.0174532925 | |
48 | #define HEIGHT_OF_LAT_DEGREE (111318.84502/ALTI_TO_MPP) | |
49 | #define HEIGHT_OF_LAT_MINUTE (1855.3140837/ALTI_TO_MPP) | |
50 | #define WIDTH_BUFFER 0 | |
51 | #define HEIGHT_BUFFER 25 | |
52 | #define REAL_WIDTH_BUFFER 1 | |
53 | #define REAL_HEIGHT_BUFFER 26 | |
54 | ||
55 | /* first buffer is to cut off the expedia/microsoft logo. Annoying little buggers ;) */ | |
56 | /* second is to allow for a 1-pixel overlap on each side. this is a good thing (tm) */ | |
57 | ||
58 | static const guint expedia_altis[] = { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 }; | |
59 | /* square this number to find out how many per square degree. */ | |
60 | static const gdouble expedia_altis_degree_freq[] = { 120, 60, 30, 15, 8, 4, 2, 1, 1, 1 }; | |
61 | static const guint expedia_altis_count = sizeof(expedia_altis) / sizeof(expedia_altis[0]); | |
62 | ||
63 | gdouble expedia_altis_freq ( gint alti ) | |
64 | { | |
65 | static gint i; | |
66 | for ( i = 0; i < expedia_altis_count; i++ ) | |
67 | if ( expedia_altis[i] == alti ) | |
68 | return expedia_altis_degree_freq [ i ]; | |
69 | ||
70 | g_error ( "Invalid expedia altitude" ); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | /* returns -1 if none of the above. */ | |
75 | gint expedia_zoom_to_alti ( gdouble zoom ) | |
76 | { | |
77 | guint i; | |
78 | for ( i = 0; i < expedia_altis_count; i++ ) | |
79 | if ( fabs(expedia_altis[i] - zoom) / zoom < MPP_MARGIN_OF_ERROR ) | |
80 | return expedia_altis[i]; | |
81 | return -1; | |
82 | } | |
83 | ||
84 | /* | |
85 | gint expedia_pseudo_zone ( gint alti, gint x, gint y ) | |
86 | { | |
87 | return (int) (x/expedia_altis_freq(alti)*180) + (int) (y/expedia_altis_freq(alti)*90); | |
88 | } | |
89 | */ | |
90 | ||
91 | void expedia_snip ( const gchar *file ) | |
92 | { | |
93 | /* Load the pixbuf */ | |
94 | GError *gx = NULL; | |
95 | GdkPixbuf *old, *cropped; | |
96 | gint width, height; | |
97 | ||
98 | old = gdk_pixbuf_new_from_file ( file, &gx ); | |
99 | if (gx) | |
100 | { | |
101 | g_warning ( "Couldn't open EXPEDIA image file (right after successful download! Please report and delete image file!): %s", gx->message ); | |
102 | g_error_free ( gx ); | |
103 | return; | |
104 | } | |
105 | ||
106 | width = gdk_pixbuf_get_width ( old ); | |
107 | height = gdk_pixbuf_get_height ( old ); | |
108 | ||
109 | cropped = gdk_pixbuf_new_subpixbuf ( old, WIDTH_BUFFER, HEIGHT_BUFFER, | |
110 | width - 2*WIDTH_BUFFER, height - 2*HEIGHT_BUFFER ); | |
111 | ||
112 | gdk_pixbuf_save ( cropped, file, "png", NULL, NULL, &gx ); | |
113 | if ( gx ) { | |
114 | g_warning ( "Couldn't save EXPEDIA image file (right after successful download! Please report and delete image file!): %s", gx->message ); | |
115 | g_error_free ( gx ); | |
116 | } | |
117 | ||
118 | g_object_unref ( cropped ); | |
119 | g_object_unref ( old ); | |
120 | } | |
121 | ||
122 | /* if degree_freeq = 60 -> nearest minute (in middle) */ | |
123 | /* everything starts at -90,-180 -> 0,0. then increments by (1/degree_freq) */ | |
124 | static gboolean expedia_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) | |
125 | { | |
126 | gint alti; | |
127 | ||
128 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
129 | ||
130 | if ( xzoom != yzoom ) | |
131 | return FALSE; | |
132 | ||
133 | alti = expedia_zoom_to_alti ( xzoom ); | |
134 | if ( alti != -1 ) | |
135 | { | |
136 | dest->scale = alti; | |
137 | dest->x = (int) (((src->east_west+180) * expedia_altis_freq(alti))+0.5); | |
138 | dest->y = (int) (((src->north_south+90) * expedia_altis_freq(alti))+0.5); | |
139 | /* + 0.5 to round off and not floor */ | |
140 | ||
141 | /* just to space out tiles on the filesystem */ | |
142 | dest->z = 0; | |
143 | return TRUE; | |
144 | } | |
145 | return FALSE; | |
146 | } | |
147 | ||
148 | void expedia_xy_to_latlon_middle ( gint alti, gint x, gint y, struct LatLon *ll ) | |
149 | { | |
150 | ll->lon = (((gdouble)x) / expedia_altis_freq(alti)) - 180; | |
151 | ll->lat = (((gdouble)y) / expedia_altis_freq(alti)) - 90; | |
152 | } | |
153 | ||
154 | static void expedia_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ) | |
155 | { | |
156 | dest->mode = VIK_COORD_LATLON; | |
157 | dest->east_west = (((gdouble)src->x) / expedia_altis_freq(src->scale)) - 180; | |
158 | dest->north_south = (((gdouble)src->y) / expedia_altis_freq(src->scale)) - 90; | |
159 | } | |
160 | ||
161 | static int expedia_download ( MapCoord *src, const gchar *dest_fn ) | |
162 | { | |
163 | gint height, width; | |
164 | struct LatLon ll; | |
165 | gchar *uri; | |
166 | int res = -1; | |
167 | ||
168 | expedia_xy_to_latlon_middle ( src->scale, src->x, src->y, &ll ); | |
169 | ||
170 | height = HEIGHT_OF_LAT_DEGREE / expedia_altis_freq(src->scale) / (src->scale); | |
171 | width = height * cos ( ll.lat * DEGREES_TO_RADS ); | |
172 | ||
173 | height += 2*REAL_HEIGHT_BUFFER; | |
174 | width += 2*REAL_WIDTH_BUFFER; | |
175 | ||
176 | uri = g_strdup_printf ( "/pub/agent.dll?qscr=mrdt&ID=3XNsF.&CenP=%lf,%lf&Lang=%s&Alti=%d&Size=%d,%d&Offs=0.000000,0.000000&BCheck&tpid=1", | |
177 | ll.lat, ll.lon, (ll.lon > -30) ? "EUR0809" : "USA0409", src->scale, width, height ); | |
178 | ||
179 | if ((res = a_http_download_get_url_nohostname ( "expedia.com", uri, dest_fn )) == 0) /* All OK */ | |
180 | expedia_snip ( dest_fn ); | |
181 | return(res); | |
182 | } | |
183 | ||
184 |