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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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decode.cpp
+2 -2
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@@ -207,9 +207,9 @@ void handle(std::string message, int z, unsigned x, unsigned y, std::set<std::st
}
double scale = 0;
if (coordinate_mode == 1) { // fraction
if (coordinate_mode == 1) { // fraction
scale = layer.extent;
} else if (coordinate_mode == 2) { // integer
} else if (coordinate_mode == 2) { // integer
scale = 1;
}
layer_to_geojson(layer, z, x, y, !pipeline, pipeline, pipeline, false, 0, 0, 0, !force, state, scale);