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Improve precision of polygon area calculations (#19)

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* Improve precision of get_area by using long double

* Trying to get consistent polygon area results between ARM and x86

* Calculate polygon area closer to the origin for better precision

* Update changelog

* Also exercise tiny polygon dust in the ring area test

They previously behaved differently here between x86 and ARM

* On M1 Macs, long double is just double anyway, so don't use it

* Be more careful about overflow: scale the polygon ring down into range

* Fix the bug I just introduced in the scaled area calculation

* Use only the sign from the scaled-down area calculation

Co-authored-by: Roman Karavia <47303530+romankaravia@users.noreply.github.com>
This commit is contained in:
Erica Fischer
2022-10-04 10:04:34 -07:00
committed by GitHub
co-authored by Roman Karavia
parent a6abb0bc30
commit 182093bdc7
9 changed files with 239 additions and 14 deletions
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geometry.hpp
+1 -1
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@@ -74,7 +74,7 @@ drawvec reorder_lines(drawvec &geom);
drawvec fix_polygon(drawvec &geom);
std::vector<drawvec> chop_polygon(std::vector<drawvec> &geoms);
void check_polygon(drawvec &geom);
double get_area(drawvec &geom, size_t i, size_t j);
double get_area(const drawvec &geom, size_t i, size_t j);
double get_mp_area(drawvec &geom);
drawvec simple_clip_poly(drawvec &geom, long long x1, long long y1, long long x2, long long y2);