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Improve quality of coalescing-as-needed; add options to limit feature count (#25)

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* Add an option to limit geometry vertex count

* Update docs and changelog

* Track desired feature count and geometry size in strategies

* Remove dead code for a long-forgotten inaccessible option

* Fix the option name in changelog

* Refine coalesce-smallest to only coalesce onto other small features

* Clean polygons before coalescing-as-needed

* Don't accumulate tiny polygon holes as negative dust

* Add the option not to limit the feature count at maxzoom

* Add options to limit feature count more abruptly in each tile

* Revert "Add the option not to limit the feature count at maxzoom"

This reverts commit ace173ab7a.

* Revert "Fix the option name in changelog"

This reverts commit 38dbce8405.

* Revert "Add an option to limit geometry vertex count"

This reverts commit d379fdf06b.

* Remove test for reverted option

* Remove more leftovers from geometry size limiting

* Update changelog
This commit is contained in:
Erica Fischer
2022-11-17 13:09:10 -08:00
committed by GitHub
parent 7733cced43
commit 8eec2be462
30 changed files with 1773 additions and 636 deletions
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geometry.cpp
+6 -3
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@@ -632,12 +632,12 @@ drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *reduced, double
// inner rings must just have their area de-accumulated rather
// than being drawn since we don't really know where they are.
// i.e., this ring (inner or outer) is small enough that we are including it
// i.e., this outer ring is small enough that we are including it
// in a tiny polygon rather than letting it represent itself,
// OR it is an inner ring and we haven't output an outer ring for it to be
// cut out of, so we are just subtracting its area from the tiny polygon
// rather than trying to deal with it geometrically
if (std::fabs(area) <= pixel * pixel || (area < 0 && !included_last_outer)) {
if ((area > 0 && area <= pixel * pixel) || (area < 0 && !included_last_outer)) {
// printf("area is only %f vs %lld so using square\n", area, pixel * pixel);
*accum_area += area;
@@ -659,10 +659,13 @@ drawvec reduce_tiny_poly(drawvec &geom, int z, int detail, bool *reduced, double
}
}
// i.e., this ring is large enough that it gets to represent itself
// or it is a tiny hole out of a real polygon, which we are still treating
// as a real geometry because otherwise we can accumulate enough tiny holes
// that we will drop the next several outer rings getting back up to 0.
else {
// printf("area is %f so keeping instead of %lld\n", area, pixel * pixel);
for (size_t k = i; k <= j && k < geom.size(); k++) {
for (size_t k = i; k < j && k < geom.size(); k++) {
out.push_back(geom[k]);
}