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be043e44 | 1 | %headertop{ |
2 | #ifdef HAVE_CONFIG_H | |
3 | #include "config.h" | |
4 | #endif | |
5 | ||
6 | #include "vikcoord.h" | |
7 | #include "mapcoord.h" | |
8 | #include "vik-map-type.h" | |
9 | %} | |
10 | ||
11 | ||
12 | %{ | |
13 | ||
14 | #ifdef HAVE_MATH_H | |
15 | #include <math.h> | |
16 | #endif | |
17 | ||
18 | #include "googlemaps.h" | |
19 | ||
20 | /* 1 << (x-1) is like a 2**(x-1) */ | |
21 | #define GZ(x) ((1<<(x-1))*GOOGLEMAPS_ZOOM_ONE_MPP) | |
22 | ||
23 | static const gdouble scale_mpps[] = { GZ(1)/2, GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9), | |
24 | GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15) }; | |
25 | ||
26 | static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])); | |
27 | ||
28 | #define ERROR_MARGIN 0.01 | |
29 | static guint8 googlemaps_zoom ( gdouble mpp ) { | |
30 | gint i; | |
31 | for ( i = 0; i < num_scales; i++ ) { | |
32 | if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) | |
33 | return i; | |
34 | } | |
35 | return 255; | |
36 | } | |
37 | %} | |
38 | ||
39 | class Google:Maps from Vik:Map:Type { | |
40 | override (Vik:Map:Type) void | |
41 | mapcoord_to_center_coord ( Vik:Map:Type *self, MapCoord *src, VikCoord *dest ) | |
42 | { | |
43 | dest->mode = VIK_COORD_LATLON; | |
44 | dest->north_south = 39.5 - (1.0/(131072 >> src->scale) * (src->y+0.5) * 128); | |
45 | dest->east_west = 1.0 / (131072 >> src->scale) * (src->x+0.5) / 0.77162458338772 * 128 - 98.35; | |
46 | } | |
47 | ||
48 | override (Vik:Map:Type) gboolean | |
49 | coord_to_mapcoord ( self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) | |
50 | { | |
51 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
52 | ||
53 | if ( xzoom != yzoom ) | |
54 | return FALSE; | |
55 | ||
56 | dest->scale = googlemaps_zoom ( xzoom ); | |
57 | if ( dest->scale == 255 ) | |
58 | return FALSE; | |
59 | ||
60 | dest->x = (gint) floor ( floor ((src->east_west + 98.35) * (131072 >> dest->scale) * 0.77162458338772) / 128); | |
61 | dest->y = (gint) floor ( floor ((39.5 - src->north_south) * (131072 >> dest->scale)) / 128); | |
62 | dest->z = 0; | |
63 | return TRUE; | |
64 | } | |
65 | ||
66 | } |