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Getting closer to getting antimeridian-crossing polygons right

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This commit is contained in:
Erica Fischer
2024-09-10 10:23:38 -07:00
parent cd466e63a4
commit dbe4965c6a
5 changed files with 190 additions and 104 deletions
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read_json.cpp
+6 -4
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@@ -278,9 +278,6 @@ std::vector<mvt_layer> parse_layers(FILE *fp, int z, unsigned x, unsigned y, int
drawvec dv;
parse_geometry(t, coordinates, dv, VT_MOVETO, "Filter output", jp->line, j);
if (mb_geometry[t] == VT_POLYGON) {
dv = fix_polygon(dv, false, false);
}
// handle longitude wraparound
//
@@ -289,7 +286,7 @@ std::vector<mvt_layer> parse_layers(FILE *fp, int z, unsigned x, unsigned y, int
// to the right edge, or vice versa, is unexpected,
// so move it to the other side.
if (fix_longitudes) {
if (fix_longitudes && mb_geometry[t] == VT_POLYGON) {
const long long quarter_world = 1LL << 30;
const long long world = 1LL << 32;
@@ -332,6 +329,10 @@ std::vector<mvt_layer> parse_layers(FILE *fp, int z, unsigned x, unsigned y, int
}
}
if (mb_geometry[t] == VT_POLYGON) {
dv = fix_polygon(dv, false, false);
}
// Offset and scale geometry from global to tile
for (size_t i = 0; i < dv.size(); i++) {
@@ -351,6 +352,7 @@ std::vector<mvt_layer> parse_layers(FILE *fp, int z, unsigned x, unsigned y, int
// on the other side of the world
dv = clean_or_clip_poly(dv, z, 256, true, false);
if (dv.size() < 3) {
// printf("%s\n", json_stringify(j));
dv.clear();
}
}