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Make clockwise check work when coordinates are duplicated

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This commit is contained in:
Andreas Hocevar
2020-09-04 20:39:56 +02:00
parent 3a01e083c6
commit f2b790adf1
2 changed files with 130 additions and 34 deletions
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55
test/spec/ol/geom/flat/orient.test.js
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@@ -29,6 +29,61 @@ describe('ol.geom.flat.orient', function () {
);
expect(isClockwise).to.be(false);
});
it('identifies clockwise with duplicated coordinates', function () {
const flatCoordinates = [0, 1, 0, 1, 1, 4, 1, 4, 4, 3, 4, 3, 3, 0, 3, 0];
const isClockwise = linearRingIsClockwise(
flatCoordinates,
0,
flatCoordinates.length,
2
);
expect(isClockwise).to.be(true);
});
it('identifies anti-clockwise with duplicated coordinates', function () {
const flatCoordinates = [2, 2, 2, 2, 3, 2, 3, 2, 3, 3, 3, 3, 2, 3, 2, 3];
const isClockwise = linearRingIsClockwise(
flatCoordinates,
0,
flatCoordinates.length,
2
);
expect(isClockwise).to.be(false);
});
it('identifies clockwise when last coordinate equals first', function () {
const flatCoordinates = [0, 1, 1, 4, 4, 3, 3, 0, 0, 1];
const isClockwise = linearRingIsClockwise(
flatCoordinates,
0,
flatCoordinates.length,
2
);
expect(isClockwise).to.be(true);
});
it('identifies anti-clockwise when last coordinate equals first', function () {
const flatCoordinates = [2, 2, 3, 2, 3, 3, 2, 3, 2, 2];
const isClockwise = linearRingIsClockwise(
flatCoordinates,
0,
flatCoordinates.length,
2
);
expect(isClockwise).to.be(false);
});
it('returns undefined when ring has too few vertices', function () {
const flatCoordinates = [2, 2, 3, 2];
const isClockwise = linearRingIsClockwise(
flatCoordinates,
0,
flatCoordinates.length,
2
);
expect(isClockwise).to.be(undefined);
});
});
describe('ol.geom.flat.orient.linearRingsAreOriented', function () {