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Round coordinates instead of truncating to avoid projection error

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This commit is contained in:
Eric Fischer 2016-12-06 16:47:56 -08:00
parent 679189e5a2
commit d8fe69a99e
1 changed files with 3 additions and 2 deletions
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5
plugin.cpp
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@ -5,6 +5,7 @@
#include <map>
#include <pthread.h>
#include <unistd.h>
#include <cmath>
#include "mvt.hpp"
#include "plugin.hpp"
#include "projection.hpp"
@ -150,8 +151,8 @@ mvt_layer parse_layer(int fd, unsigned z, unsigned x, unsigned y, mvt_layer cons
// Scale and offset geometry from global to tile
for (size_t i = 0; i < dv.size(); i++) {
long long scale = 1LL << (32 - z);
dv[i].x = (dv[i].x - scale * x) * olayer.extent / scale;
dv[i].y = (dv[i].y - scale * y) * olayer.extent / scale;
dv[i].x = std::round((dv[i].x - scale * x) * olayer.extent / (double) scale);
dv[i].y = std::round((dv[i].y - scale * y) * olayer.extent / (double) scale);
}
if (mb_geometry[t] == VT_POLYGON) {