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Merge pull request #152 from mapbox/clip-buffer

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Make clipping behavior with no buffer consistent with Mapnik
This commit is contained in:
Eric Fischer 2016-01-20 14:57:38 -08:00
commit baf576f257
4 changed files with 12 additions and 5 deletions
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5
CHANGELOG.md
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@ -1,3 +1,8 @@
## 1.7.1
* Make clipping behavior with no buffer consistent with Mapnik.
Features that are exactly on a tile boundary appear in both tiles.
## 1.7.0
* Parallel processing of input with -P works with streamed input too

4
decode.cc
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@ -194,8 +194,8 @@ void handle(std::string message, int z, unsigned x, unsigned y, int describe) {
g += 2;
long long scale = 1LL << (32 - z);
long long wx = scale * x + (scale / extent) * (px + .5);
long long wy = scale * y + (scale / extent) * (py + .5);
long long wx = scale * x + (scale / extent) * px;
long long wy = scale * y + (scale / extent) * py;
double lat, lon;
tile2latlon(wx, wy, 32, &lat, &lon);

6
tile.cc
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@ -376,8 +376,10 @@ void rewrite(drawvec &geom, int z, int nextzoom, int maxzoom, long long *bbox, u
// Division instead of right-shift because coordinates can be negative
bbox2[k] = bbox[k] / (1 << (32 - nextzoom - 8));
}
bbox2[0] -= buffer;
bbox2[1] -= buffer;
// Decrement the top and left edges so that any features that are
// touching the edge can potentially be included in the adjacent tiles too.
bbox2[0] -= buffer + 1;
bbox2[1] -= buffer + 1;
bbox2[2] += buffer;
bbox2[3] += buffer;

2
version.h
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@ -1 +1 @@
#define VERSION "tippecanoe v1.7.0\n"
#define VERSION "tippecanoe v1.7.1\n"