Improve precision of polygon area calculations (#19)

mirror of https://github.com/felt/tippecanoe.git synced 2026-10-05 18:05:42 +02:00

* 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

									
										CHANGELOG.md
									
		+4
		
												View File
												
				@@ -1,3 +1,7 @@

				## 2.8.1

				* Improve precision of polygon ring area calculations

				## 2.8.0

				* Add the option to use a different simplification level at maxzoom