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Move projection and tile arithmetic to its own file

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This commit is contained in:
Eric Fischer
2014-10-24 17:22:14 -07:00
parent 754dbf152a
commit 46100c34df
9 changed files with 82 additions and 79 deletions
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decode.cc
+4 -8
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@@ -7,6 +7,10 @@
#include <math.h>
#include "vector_tile.pb.h"
extern "C" {
#include "projection.h"
}
// https://github.com/mapbox/mapnik-vector-tile/blob/master/src/vector_tile_compression.hpp
inline bool is_compressed(std::string const& data) {
return data.size() > 2 && (uint8_t)data[0] == 0x78 && (uint8_t)data[1] == 0x9C;
@@ -44,14 +48,6 @@ int dezig(unsigned n) {
return (n >> 1) ^ (-(n & 1));
}
// http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
void tile2latlon(unsigned int x, unsigned int y, int zoom, double *lat, double *lon) {
unsigned long long n = 1LL << zoom;
*lon = 360.0 * x / n - 180.0;
double lat_rad = atan(sinh(M_PI * (1 - 2.0 * y / n)));
*lat = lat_rad * 180 / M_PI;
}
void handle(std::string message, int z, unsigned x, unsigned y) {
GOOGLE_PROTOBUF_VERIFY_VERSION;