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Fix coordinate rounding error in the prefilter

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This commit is contained in:
Eric Fischer 2016-12-12 16:12:22 -08:00
parent 9c0e2cdfa7
commit ad4060eced
2 changed files with 1776 additions and 2 deletions
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6
plugin.cpp
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@ -16,6 +16,7 @@
#include <sys/types.h>
#include <sys/wait.h>
#include <sqlite3.h>
#include "main.hpp"
#include "mvt.hpp"
#include "mbtiles.hpp"
#include "projection.hpp"
@ -321,14 +322,15 @@ serial_feature parse_feature(json_pull *jp, unsigned z, unsigned x, unsigned y,
}
// Scale and offset geometry from global to tile
double scale = 1LL << geometry_scale;
for (size_t i = 0; i < dv.size(); i++) {
unsigned sx = 0, sy = 0;
if (z != 0) {
sx = x << (32 - z);
sy = y << (32 - z);
}
dv[i].x -= sx;
dv[i].y -= sy;
dv[i].x = std::round(dv[i].x / scale) * scale - sx;
dv[i].y = std::round(dv[i].y / scale) * scale - sy;
}
if (dv.size() > 0) {

1772
tests/ne_110m_populated_places/out/-yNAME_-Ccat_-z5.json Normal file
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