Divide and conquer when cleaning complex polygons after coalescing

This commit is contained in:
Erica Fischer
2025-05-05 13:12:12 -07:00
parent b7b5c8484f
commit 887db65698
8 changed files with 193 additions and 30520 deletions
+124 -2
View File
@@ -257,8 +257,8 @@ static void decode_clipped(mapbox::geometry::multi_polygon<long long> &t, drawve
}
}
drawvec clean_or_clip_poly(drawvec &geom, int z, int buffer, bool clip, bool try_scaling) {
geom = remove_noop(geom, VT_POLYGON, 0);
drawvec clean_or_clip_poly(const drawvec &geom_in, int z, int buffer, bool clip, bool try_scaling) {
drawvec geom = remove_noop(geom_in, VT_POLYGON, 0);
mapbox::geometry::multi_polygon<long long> result;
double scale = 16.0;
@@ -2492,3 +2492,125 @@ bool line_is_too_small(drawvec const &geometry, int z, int detail) {
return true;
}
drawvec coalesce_linestring(drawvec const &geom) {
std::multimap<draw, drawvec> segments;
for (size_t i = 0; i < geom.size(); i++) {
if (geom[i].op == VT_MOVETO) {
drawvec seg;
seg.push_back(geom[i]);
size_t j;
for (j = i + 1; j < geom.size(); j++) {
if (geom[j].op != VT_LINETO) {
break;
}
seg.push_back(geom[j]);
}
segments.emplace(seg[0], seg);
i = j - 1;
}
}
drawvec out;
while (segments.size() != 0) {
// choose an arbitrary starting segment
auto current = segments.begin();
const drawvec &v = current->second;
if (out.size() > 0 && v.back() == out.front()) {
// if the end of it would connect to the current union,
// put it on the front
drawvec tmp = std::move(out);
out = v;
for (const draw &d : tmp) {
out.push_back(d);
}
} else {
// otherwise, put it on the back
for (const draw &d : v) {
out.push_back(d);
}
}
segments.erase(current);
while (true) {
// now look for other segments that would chain to the end
// of the current union, until we run out of links
current = segments.find(out.back());
if (current != segments.end()) {
const drawvec &vv = current->second;
for (const draw &d : vv) {
out.push_back(d);
}
segments.erase(current);
} else {
// go back and pull another arbitrary starting segment
// off the pile
break;
}
}
}
return out;
}
drawvec coalesce_polygon(drawvec const &geom) {
// wagyu should be able to straightforwardly handle
// anything under a few hundred thousand vertices
if (geom.size() < 100000) {
return clean_or_clip_poly(geom, 0, 0, false, false);
}
// These geometries were assembled in geometric order,
// so sub-batches of them should hopefully union into
// reasonable sets.
//
// Find the first outer ring after halfway point.
for (size_t i = geom.size() / 2; i < geom.size(); i++) {
if (geom[i].op == VT_MOVETO) {
size_t j;
for (j = i + 1; j < geom.size(); j++) {
if (geom[j].op != VT_LINETO) {
break;
}
}
if (get_area(geom, i, j) > 0) {
// If we have an outer ring, split there
// and coalesce the two halves
std::vector<draw> geom1;
geom1.resize(i);
for (size_t k = 0; k < i; k++) {
geom1[k] = geom[k];
}
geom1 = coalesce_polygon(geom1);
std::vector<draw> geom2;
geom2.resize(i);
for (size_t k = i; k < geom.size(); k++) {
geom2[k - i] = geom[k];
}
geom2 = coalesce_polygon(geom2);
size_t brk = geom1.size();
geom1.resize(brk + geom2.size());
for (size_t k = 0; k < geom2.size(); k++) {
geom1[brk + k] = geom2[k];
}
return clean_or_clip_poly(geom1, 0, 0, false, false);
}
i = j - 1;
}
}
// Can't find a breakpoint; take what we can get.
return clean_or_clip_poly(geom, 0, 0, false, false);
}
+3 -1
View File
@@ -72,7 +72,7 @@ void to_tile_scale(drawvec &geom, int z, int detail);
drawvec from_tile_scale(drawvec const &geom, int z, int detail);
drawvec remove_noop(drawvec geom, int type, int shift);
drawvec clip_point(drawvec &geom, int z, long long buffer);
drawvec clean_or_clip_poly(drawvec &geom, int z, int buffer, bool clip, bool try_scaling);
drawvec clean_or_clip_poly(const drawvec &geom, int z, int buffer, bool clip, bool try_scaling);
drawvec close_poly(drawvec &geom);
drawvec reduce_tiny_poly(const drawvec &geom, int z, int detail, bool *still_needs_simplification, bool *reduced_away, double *accum_area, double tiny_polygon_size);
int clip(long long *x0, long long *y0, long long *x1, long long *y1, long long xmin, long long ymin, long long xmax, long long ymax);
@@ -173,5 +173,7 @@ void get_quadkey_bounds(long long xmin, long long ymin, long long xmax, long lon
clipbbox parse_clip_poly(std::string arg);
bool line_is_too_small(drawvec const &geometry, int z, int detail);
drawvec coalesce_polygon(drawvec const &geom);
drawvec coalesce_linestring(drawvec const &geom);
#endif
File diff suppressed because one or more lines are too long
@@ -136,7 +136,7 @@
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,
+2 -2
View File
@@ -134,7 +134,7 @@
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@@ -158,7 +158,7 @@
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@@ -45,7 +45,7 @@
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@@ -75,19 +75,19 @@
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@@ -105,13 +105,13 @@
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@@ -129,7 +129,7 @@
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@@ -165,31 +165,31 @@
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{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -80.518799, 40.641051 ], [ -80.517426, 41.013066 ] ], [ [ -80.518799, 40.641051 ], [ -80.518799, 39.720920 ], [ -79.477844, 39.720920 ] ], [ [ -80.518799, 40.641051 ], [ -80.657501, 40.591014 ], [ -80.614929, 40.463666 ], [ -80.661621, 40.233412 ], [ -80.765305, 39.973437 ], [ -80.862122, 39.757352 ], [ -80.878601, 39.654341 ], [ -81.150513, 39.426116 ], [ -81.265869, 39.377303 ], [ -81.401138, 39.349166 ], [ -81.521988, 39.371464 ], [ -81.562500, 39.340139 ], [ -81.606445, 39.306675 ] ], [ [ -79.477844, 39.720920 ], [ -79.486084, 39.213635 ], [ -79.332275, 39.302956 ], [ -79.161301, 39.418160 ], [ -78.962860, 39.457933 ], [ -78.828964, 39.562824 ], [ -78.750000, 39.552236 ], [ -78.706055, 39.545882 ] ], [ [ -79.477844, 39.720920 ], [ -78.706055, 39.719863 ] ], [ [ -78.706055, 38.934844 ], [ -78.744507, 38.909202 ], [ -78.883209, 38.788345 ] ], [ [ -78.907242, 38.788345 ], [ -78.965607, 38.822056 ], [ -78.991699, 38.788345 ] ] ] } }
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -80.518799, 40.641051 ], [ -80.517426, 41.013066 ] ], [ [ -80.518799, 40.641051 ], [ -80.518799, 39.720920 ], [ -79.477844, 39.720920 ], [ -79.486084, 39.213635 ], [ -79.332275, 39.302956 ], [ -79.161301, 39.418160 ], [ -78.962860, 39.457933 ], [ -78.828964, 39.562824 ], [ -78.750000, 39.552236 ], [ -78.706055, 39.545882 ] ], [ [ -80.518799, 40.641051 ], [ -80.657501, 40.591014 ], [ -80.614929, 40.463666 ], [ -80.661621, 40.233412 ], [ -80.765305, 39.973437 ], [ -80.862122, 39.757352 ], [ -80.878601, 39.654341 ], [ -81.150513, 39.426116 ], [ -81.265869, 39.377303 ], [ -81.401138, 39.349166 ], [ -81.521988, 39.371464 ], [ -81.562500, 39.340139 ], [ -81.606445, 39.306675 ] ], [ [ -79.477844, 39.720920 ], [ -78.706055, 39.719863 ] ], [ [ -78.706055, 38.934844 ], [ -78.744507, 38.909202 ], [ -78.883209, 38.788345 ] ], [ [ -78.907242, 38.788345 ], [ -78.965607, 38.822056 ], [ -78.991699, 38.788345 ] ] ] } }
] }
] }
,
@@ -1125,7 +1125,7 @@
,
{ "type": "FeatureCollection", "properties": { "zoom": 7, "x": 36, "y": 48 }, "features": [
{ "type": "FeatureCollection", "properties": { "layer": "countries", "version": 2, "extent": 4096 }, "features": [
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -77.722778, 39.322612 ], [ -77.801743, 39.449980 ], [ -77.923279, 39.592990 ], [ -78.232269, 39.672313 ], [ -78.425217, 39.596694 ], [ -78.533707, 39.522581 ], [ -78.793945, 39.558059 ] ], [ [ -75.893555, 39.723032 ], [ -76.668091, 39.720920 ], [ -77.522964, 39.725673 ], [ -78.550186, 39.719863 ], [ -78.793945, 39.720392 ] ], [ [ -77.722778, 39.322612 ], [ -77.834702, 39.134321 ], [ -78.345566, 39.405428 ], [ -78.424530, 39.139115 ], [ -78.548813, 39.039986 ], [ -78.744507, 38.909202 ], [ -78.793945, 38.866444 ] ], [ [ -77.722778, 39.322612 ], [ -77.576523, 39.288608 ], [ -77.443314, 39.213635 ], [ -77.516785, 39.106087 ], [ -77.305984, 39.045853 ], [ -77.119217, 38.933776 ], [ -77.036819, 38.848264 ], [ -77.040939, 38.789416 ], [ -77.040939, 38.788345 ] ], [ [ -77.119217, 38.933776 ], [ -77.038879, 38.982364 ], [ -76.911850, 38.878205 ], [ -77.040939, 38.789416 ] ] ] } }
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -75.893555, 39.723032 ], [ -76.668091, 39.720920 ], [ -77.522964, 39.725673 ], [ -78.550186, 39.719863 ], [ -78.793945, 39.720392 ] ], [ [ -77.722778, 39.322612 ], [ -77.801743, 39.449980 ], [ -77.923279, 39.592990 ], [ -78.232269, 39.672313 ], [ -78.425217, 39.596694 ], [ -78.533707, 39.522581 ], [ -78.793945, 39.558059 ] ], [ [ -77.722778, 39.322612 ], [ -77.834702, 39.134321 ], [ -78.345566, 39.405428 ], [ -78.424530, 39.139115 ], [ -78.548813, 39.039986 ], [ -78.744507, 38.909202 ], [ -78.793945, 38.866444 ] ], [ [ -77.722778, 39.322612 ], [ -77.576523, 39.288608 ], [ -77.443314, 39.213635 ], [ -77.516785, 39.106087 ], [ -77.305984, 39.045853 ], [ -77.119217, 38.933776 ], [ -77.036819, 38.848264 ], [ -77.040939, 38.789416 ], [ -77.040939, 38.788345 ] ], [ [ -77.119217, 38.933776 ], [ -77.038879, 38.982364 ], [ -76.911850, 38.878205 ], [ -77.040939, 38.789416 ] ] ] } }
] }
] }
,
@@ -1149,13 +1149,13 @@
,
{ "type": "FeatureCollection", "properties": { "zoom": 7, "x": 37, "y": 48 }, "features": [
{ "type": "FeatureCollection", "properties": { "layer": "countries", "version": 2, "extent": 4096 }, "features": [
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -73.912582, 40.960197 ], [ -74.014893, 41.013066 ] ], [ [ -73.664703, 41.013066 ], [ -73.656464, 40.985082 ] ], [ [ -75.787811, 39.723560 ], [ -75.981445, 39.723032 ] ], [ [ -75.405350, 39.795348 ], [ -75.200729, 39.887085 ], [ -75.128632, 39.949753 ], [ -74.891739, 40.081749 ], [ -74.763336, 40.190939 ], [ -75.077820, 40.449560 ], [ -75.095673, 40.555548 ], [ -75.204163, 40.586842 ], [ -75.199356, 40.747257 ], [ -75.081940, 40.869911 ], [ -75.127258, 40.979898 ], [ -75.135498, 41.000112 ], [ -75.112152, 41.013066 ] ], [ [ -75.787811, 39.723560 ], [ -75.733566, 38.788345 ] ], [ [ -75.787811, 39.723560 ], [ -75.710907, 39.802206 ], [ -75.620956, 39.847558 ], [ -75.405350, 39.795348 ], [ -75.554352, 39.691337 ], [ -75.527573, 39.498742 ] ] ] } }
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -73.664703, 41.013066 ], [ -73.656464, 40.985082 ] ], [ [ -73.912582, 40.960197 ], [ -74.014893, 41.013066 ] ], [ [ -75.405350, 39.795348 ], [ -75.200729, 39.887085 ], [ -75.128632, 39.949753 ], [ -74.891739, 40.081749 ], [ -74.763336, 40.190939 ], [ -75.077820, 40.449560 ], [ -75.095673, 40.555548 ], [ -75.204163, 40.586842 ], [ -75.199356, 40.747257 ], [ -75.081940, 40.869911 ], [ -75.127258, 40.979898 ], [ -75.135498, 41.000112 ], [ -75.112152, 41.013066 ] ], [ [ -75.787811, 39.723560 ], [ -75.981445, 39.723032 ] ], [ [ -75.787811, 39.723560 ], [ -75.733566, 38.788345 ] ], [ [ -75.787811, 39.723560 ], [ -75.710907, 39.802206 ], [ -75.620956, 39.847558 ], [ -75.405350, 39.795348 ], [ -75.554352, 39.691337 ], [ -75.527573, 39.498742 ] ] ] } }
] }
] }
,
{ "type": "FeatureCollection", "properties": { "zoom": 7, "x": 37, "y": 47 }, "features": [
{ "type": "FeatureCollection", "properties": { "layer": "countries", "version": 2, "extent": 4096 }, "features": [
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -74.678879, 41.355680 ], [ -74.840240, 41.426253 ], [ -75.010529, 41.495721 ], [ -75.075073, 41.641105 ], [ -75.048981, 41.751336 ], [ -75.167770, 41.841943 ], [ -75.385437, 41.998794 ], [ -75.981445, 41.999305 ] ], [ [ -73.282242, 42.743482 ], [ -73.263702, 43.100983 ] ], [ [ -74.678879, 41.355680 ], [ -73.950348, 40.979898 ], [ -73.912582, 40.960197 ] ], [ [ -73.282242, 42.743482 ], [ -73.081055, 42.739448 ] ], [ [ -73.282242, 42.743482 ], [ -73.497849, 42.054391 ], [ -73.553467, 41.289674 ], [ -73.475189, 41.204489 ], [ -73.692856, 41.107295 ], [ -73.656464, 40.985082 ] ], [ [ -73.497849, 42.054391 ], [ -73.081055, 42.044194 ] ], [ [ -74.678879, 41.355680 ], [ -74.801102, 41.311340 ], [ -74.976196, 41.087632 ], [ -75.135498, 41.000112 ], [ -75.127258, 40.979898 ], [ -75.113525, 40.946714 ] ] ] } }
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -73.282242, 42.743482 ], [ -73.263702, 43.100983 ] ], [ [ -73.282242, 42.743482 ], [ -73.081055, 42.739448 ] ], [ [ -73.282242, 42.743482 ], [ -73.497849, 42.054391 ], [ -73.553467, 41.289674 ], [ -73.475189, 41.204489 ], [ -73.692856, 41.107295 ], [ -73.656464, 40.985082 ] ], [ [ -73.497849, 42.054391 ], [ -73.081055, 42.044194 ] ], [ [ -74.678879, 41.355680 ], [ -74.840240, 41.426253 ], [ -75.010529, 41.495721 ], [ -75.075073, 41.641105 ], [ -75.048981, 41.751336 ], [ -75.167770, 41.841943 ], [ -75.385437, 41.998794 ], [ -75.981445, 41.999305 ] ], [ [ -74.678879, 41.355680 ], [ -73.950348, 40.979898 ], [ -73.912582, 40.960197 ] ], [ [ -74.678879, 41.355680 ], [ -74.801102, 41.311340 ], [ -74.976196, 41.087632 ], [ -75.135498, 41.000112 ], [ -75.127258, 40.979898 ], [ -75.113525, 40.946714 ] ] ] } }
] }
] }
,
@@ -1167,7 +1167,7 @@
,
{ "type": "FeatureCollection", "properties": { "zoom": 7, "x": 38, "y": 47 }, "features": [
{ "type": "FeatureCollection", "properties": { "layer": "countries", "version": 2, "extent": 4096 }, "features": [
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -72.456894, 42.726839 ], [ -73.168945, 42.740961 ] ], [ [ -72.456894, 42.726839 ], [ -72.537231, 42.830660 ], [ -72.458954, 42.960443 ], [ -72.445908, 43.100983 ] ], [ [ -70.758133, 43.100983 ], [ -70.751266, 43.079922 ], [ -70.645523, 43.089952 ] ], [ [ -70.815125, 42.865396 ], [ -70.661316, 43.068888 ], [ -70.645523, 43.089952 ] ], [ [ -71.801147, 42.013081 ], [ -73.168945, 42.046743 ] ], [ [ -71.801147, 42.013081 ], [ -71.792908, 41.466399 ], [ -71.854019, 41.320107 ] ], [ [ -72.456894, 42.726839 ], [ -71.249084, 42.718264 ], [ -71.146088, 42.816559 ], [ -70.933914, 42.884015 ], [ -70.815125, 42.865396 ] ], [ [ -71.801147, 42.013081 ], [ -71.378860, 42.024304 ], [ -71.305389, 41.762605 ], [ -71.148148, 41.647775 ], [ -71.120682, 41.494692 ] ] ] } }
{ "type": "Feature", "properties": { "adm0_a3": "USA", "adm0_name": "United States of America", "mapcolor9": 1, "mapcolor13": 1 }, "geometry": { "type": "MultiLineString", "coordinates": [ [ [ -70.758133, 43.100983 ], [ -70.751266, 43.079922 ], [ -70.645523, 43.089952 ] ], [ [ -70.815125, 42.865396 ], [ -70.661316, 43.068888 ], [ -70.645523, 43.089952 ] ], [ [ -72.456894, 42.726839 ], [ -73.168945, 42.740961 ] ], [ [ -72.456894, 42.726839 ], [ -72.537231, 42.830660 ], [ -72.458954, 42.960443 ], [ -72.445908, 43.100983 ] ], [ [ -72.456894, 42.726839 ], [ -71.249084, 42.718264 ], [ -71.146088, 42.816559 ], [ -70.933914, 42.884015 ], [ -70.815125, 42.865396 ] ], [ [ -71.801147, 42.013081 ], [ -73.168945, 42.046743 ] ], [ [ -71.801147, 42.013081 ], [ -71.792908, 41.466399 ], [ -71.854019, 41.320107 ] ], [ [ -71.801147, 42.013081 ], [ -71.378860, 42.024304 ], [ -71.305389, 41.762605 ], [ -71.148148, 41.647775 ], [ -71.120682, 41.494692 ] ] ] } }
] }
] }
,
+11 -7
View File
@@ -633,13 +633,17 @@ static double simplify_feature(serial_feature *p, drawvec const &shared_nodes, n
}
if (!already_marked) {
if (p->coalesced && t == VT_POLYGON) {
if (p->coalesced) {
// clean coalesced polygons before simplification to avoid
// introducing shards between shapes that otherwise would have
// unioned exactly
//
// don't try to scale up because these are still world coordinates
geom = clean_or_clip_poly(geom, 0, 0, false, false);
// unioned exactly.
if (t == VT_POLYGON) {
geom = coalesce_polygon(geom);
} else if (t == VT_LINE) {
geom = coalesce_linestring(geom);
}
p->coalesced = false;
}
// continues to simplify to line_detail even if we have extra detail
@@ -2467,6 +2471,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
if (layer_features[x]->coalesced && layer_features[x]->t == VT_LINE) {
layer_features[x]->geometry = remove_noop(layer_features[x]->geometry, layer_features[x]->t, 0);
if (!(prevent[P_SIMPLIFY] || (z == maxzoom && prevent[P_SIMPLIFY_LOW]))) {
layer_features[x]->geometry = coalesce_linestring(layer_features[x]->geometry);
// XXX revisit: why does this not take zoom into account?
layer_features[x]->geometry = simplify_lines(layer_features[x]->geometry, 32, 0, 0, 0,
!(prevent[P_CLIPPING] || prevent[P_DUPLICATION]), simplification, layer_features[x]->t == VT_POLYGON ? 4 : 0, shared_nodes, NULL, 0, "");
@@ -2475,8 +2480,7 @@ long long write_tile(decompressor *geoms, std::atomic<long long> *geompos_in, ch
if (layer_features[x]->t == VT_POLYGON) {
if (layer_features[x]->coalesced) {
// we can try scaling up because this is tile coordinates
layer_features[x]->geometry = clean_or_clip_poly(layer_features[x]->geometry, 0, 0, false, true);
layer_features[x]->geometry = coalesce_polygon(layer_features[x]->geometry);
}
layer_features[x]->geometry = close_poly(layer_features[x]->geometry);