Port great-circle from turf (#50)#85
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Adds GISTool.greatCircle(from:to:npoints:offset:) computing great circle arcs between two coordinates. Returns LineString or MultiLineString (split at antimeridian when crossing).
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Summary
Ported
turf-great-circlefrom Turf.js.New file:
Sources/GISTools/Algorithms/GreatCircle.swiftGISTool.greatCircle(from:to:npoints:offset:)computes points along the great circle arc between two coordinates using spherical linear interpolation (slerp).LineStringwithnpointscopies of the coordinateMultiLineStringsplit at ±180°LineStringwithnpointscoordinatesTests:
GreatCircleTests.swift(7 tests)greatCircleSameHemispheregreatCircleCrossingAntimeridiangreatCircleSamePointgreatCircleCustomNpointsgreatCircleEquatorgreatCircleNorthSouthgreatCircleMinPointsTest results
273 tests pass across 60 suites (+7 new).
Closes #50