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Clean up polygon generation and clipping. Make sure winding order is correct.

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This commit is contained in:
Eric Fischer
2015-10-07 16:52:52 -07:00
parent 7154c29459
commit 5dc9f50345
4 changed files with 109 additions and 14 deletions
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geojson.c
+10 -4
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@@ -123,7 +123,6 @@ void parse_geometry(int t, json_object *j, unsigned *bbox, long long *fpos, FILE
}
int within = geometry_within[t];
long long began = *fpos;
if (within >= 0) {
int i;
for (i = 0; i < j->length; i++) {
@@ -187,9 +186,16 @@ void parse_geometry(int t, json_object *j, unsigned *bbox, long long *fpos, FILE
}
if (t == GEOM_POLYGON) {
if (*fpos != began) {
serialize_byte(out, VT_CLOSEPATH, fpos, fname);
}
// Note that this is not using the correct meaning of closepath.
//
// We are using it here to close an entire Polygon, to distinguish
// the Polygons within a MultiPolygon from each other.
//
// This will be undone in fix_polygon(), which needs to know which
// rings come from which Polygons so that it can make the winding order
// of the outer ring be the opposite of the order of the inner rings.
serialize_byte(out, VT_CLOSEPATH, fpos, fname);
}
}