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Add an option to drop the smallest features to make tiles small enough

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Eric Fischer
2016-11-09 17:09:05 -08:00
parent 38ce49d2d4
commit 013e6512b4
10 changed files with 7524 additions and 5 deletions
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geojson.cpp
+28
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@@ -350,6 +350,33 @@ int serialize_geometry(json_object *geometry, json_object *properties, json_obje
}
}
double extent = 0;
if (additional[A_DROP_SMALLEST_AS_NEEDED]) {
if (mb_geometry[t] == VT_POLYGON) {
for (size_t i = 0; i < dv.size(); i++) {
if (dv[i].op == VT_MOVETO) {
size_t j;
for (j = i + 1; j < dv.size(); j++) {
if (dv[j].op != VT_LINETO) {
break;
}
}
extent += get_area(dv, i, j);
i = j - 1;
}
}
} else if (mb_geometry[t] == VT_LINE) {
for (size_t i = 1; i < dv.size(); i++) {
if (dv[i].op == VT_LINETO) {
double xd = dv[i].x - dv[i - 1].x;
double yd = dv[i].y - dv[i - 1].y;
extent += sqrt(xd * xd + yd * yd);
}
}
}
}
if (tippecanoe_layername.size() != 0) {
if (layermap->count(tippecanoe_layername) == 0) {
layermap->insert(std::pair<std::string, layermap_entry>(tippecanoe_layername, layermap_entry(layermap->size())));
@@ -380,6 +407,7 @@ int serialize_geometry(json_object *geometry, json_object *properties, json_obje
sf.geometry = dv;
sf.m = m;
sf.feature_minzoom = 0; // Will be filled in during index merging
sf.extent = (long long) extent;
// Calculate the center even if off the edge of the plane,
// and then mask to bring it back into the addressable area