Port polygon-smooth from turf (#52)#87
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Implements Chaikin's algorithm for Polygon.smooth(iterations:) and MultiPolygon.smooth(iterations:). Each iteration doubles the number of points, preserving ring closure and holes.
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Summary
Ported
turf-polygon-smoothfrom Turf.js using Chaikin's algorithm.Sources/GISTools/Algorithms/PolygonSmooth.swiftPolygon.smooth(iterations:) -> Polygon— smooths outer ring and hole ringsMultiPolygon.smooth(iterations:) -> MultiPolygon— smooths all sub-polygonsTests/PolygonSmoothTests.swift(6 tests)smoothSquaresmoothMultipleIterationssmoothTrianglesmoothWithHolesmoothMultiPolygonsmoothIdempotencyTest results
272 tests pass across 60 suites (+6 new).
Closes #52