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Clip the clip regions to the tile bounds to reduce their complexity

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Erica Fischer
2024-11-27 12:22:36 -08:00
parent 641f97f7db
commit 75511a74cd
3 changed files with 34 additions and 3 deletions
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clip.cpp
+2 -3
View File
@@ -387,8 +387,7 @@ drawvec clean_or_clip_poly(drawvec &geom, int z, int buffer, bool clip, bool try
return ret;
}
drawvec clip_poly_poly(drawvec &geom, drawvec const &bounds) {
geom = remove_noop(geom, VT_POLYGON, 0);
drawvec clip_poly_poly(drawvec const &geom, drawvec const &bounds) {
mapbox::geometry::multi_polygon<long long> result;
{
@@ -450,7 +449,7 @@ drawvec clip_poly_poly(drawvec &geom, drawvec const &bounds) {
return ret;
}
drawvec clip_point_poly(drawvec &geom, drawvec const &bounds) {
drawvec clip_point_poly(drawvec const &geom, drawvec const &bounds) {
drawvec out;
for (auto const &p : geom) {
if (pnpoly_mp(bounds, p.x, p.y)) {
geometry.hpp
+4
View File
@@ -102,6 +102,10 @@ int pnpoly(const drawvec &vert, size_t start, size_t nvert, long long testx, lon
bool pnpoly_mp(drawvec const &geom, long long x, long long y);
double distance_from_line(long long point_x, long long point_y, long long segA_x, long long segA_y, long long segB_x, long long segB_y);
drawvec clip_poly_poly(drawvec const &geom, drawvec const &bounds);
drawvec clip_lines_poly(drawvec const &geom, drawvec const &bounds);
drawvec clip_point_poly(drawvec const &geom, drawvec const &bounds);
struct input_tile {
std::string tile;
int z;
overzoom.cpp
+28
View File
@@ -259,6 +259,34 @@ int main(int argc, char **argv) {
fclose(f);
}
// clip the clip polygons, if any, to the tile bounds,
// to reduce their complexity
if (clipbboxes.size() > 0) {
long long wx1 = (nx - buffer / 256.0) * (1LL << (32 - nz));
long long wy1 = (ny - buffer / 256.0) * (1LL << (32 - nz));
long long wx2 = (nx + 1 + buffer / 256.0) * (1LL << (32 - nz));
long long wy2 = (ny + 1 + buffer / 256.0) * (1LL << (32 - nz));
drawvec tile_bounds;
tile_bounds.emplace_back(VT_MOVETO, wx1, wy1);
tile_bounds.emplace_back(VT_LINETO, wx2, wy1);
tile_bounds.emplace_back(VT_LINETO, wx2, wy2);
tile_bounds.emplace_back(VT_LINETO, wx1, wy2);
tile_bounds.emplace_back(VT_LINETO, wx1, wy1);
for (auto &c : clipbboxes) {
c.minx = std::max(c.minx, wx1);
c.miny = std::max(c.miny, wy1);
c.maxx = std::min(c.maxx, wx2);
c.maxy = std::min(c.maxy, wy2);
if (c.dv.size() > 0) {
c.dv = clip_poly_poly(c.dv, tile_bounds);
}
}
}
json_object *json_filter = NULL;
if (filter.size() > 0) {
json_filter = parse_filter(filter.c_str());