38 lines
1.1 KiB
Go
38 lines
1.1 KiB
Go
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package geodata
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import (
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"math"
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"testing"
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)
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func TestPolylineSegmentsTreatsExactAntimeridianAsOneMeridian(t *testing.T) {
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segments := PolylineSegments([]GeoPoint{
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{Longitude: -180, Latitude: 10},
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{Longitude: 180, Latitude: 20},
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}, ProjectionEquirectangular)
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if len(segments) != 1 || len(segments[0]) != 2 {
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t.Fatalf("exact-antimeridian line segments = %#v", segments)
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}
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if segments[0][0].Longitude != segments[0][1].Longitude {
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t.Fatalf("exact-antimeridian line spans %.1f degrees",
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math.Abs(segments[0][1].Longitude-segments[0][0].Longitude))
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}
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}
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func TestPolygonFragmentsDropsExactAntimeridianZeroAreaDuplicate(t *testing.T) {
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fragments := PolygonFragments([]GeoPoint{
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{Longitude: -180, Latitude: 15},
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{Longitude: 180, Latitude: 14},
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{Longitude: 150, Latitude: 13},
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{Longitude: 150, Latitude: -12},
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{Longitude: 180, Latitude: -11},
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{Longitude: -180, Latitude: -10},
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}, ProjectionEquirectangular)
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if len(fragments) != 1 {
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t.Fatalf("exact-antimeridian polygon produced %d fragments, want 1", len(fragments))
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}
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if math.Abs(signedPolygonArea(fragments[0])) < 1e-12 {
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t.Fatal("exact-antimeridian polygon fragment has zero area")
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}
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}
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