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Add functions to create regular polygons

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This commit is contained in:
Andreas Hocevar
2015-05-08 11:20:26 +02:00
parent 250221cded
commit 901a0f6d8e
2 changed files with 84 additions and 0 deletions
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34
test/spec/ol/geom/polygon.test.js
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@@ -436,10 +436,44 @@ describe('ol.geom.Polygon', function() {
});
});
describe('ol.geom.Polygon.fromCircle', function() {
it('creates a regular polygon', function() {
var circle = new ol.geom.Circle([0, 0, 0], 1, ol.geom.GeometryLayout.XYZ);
var polygon = ol.geom.Polygon.fromCircle(circle);
var coordinates = polygon.getLinearRing(0).getCoordinates();
expect(coordinates[0].length).to.eql(3);
expect(coordinates[0][2]).to.eql(0);
expect(coordinates[32]).to.eql(coordinates[0]);
// east
expect(coordinates[0][0]).to.roughlyEqual(1, 1e-9);
expect(coordinates[0][1]).to.roughlyEqual(0, 1e-9);
// south
expect(coordinates[8][0]).to.roughlyEqual(0, 1e-9);
expect(coordinates[8][1]).to.roughlyEqual(1, 1e-9);
// west
expect(coordinates[16][0]).to.roughlyEqual(-1, 1e-9);
expect(coordinates[16][1]).to.roughlyEqual(0, 1e-9);
// north
expect(coordinates[24][0]).to.roughlyEqual(0, 1e-9);
expect(coordinates[24][1]).to.roughlyEqual(-1, 1e-9);
});
it('creates a regular polygon with custom sides and angle', function() {
var circle = new ol.geom.Circle([0, 0], 1);
var polygon = ol.geom.Polygon.fromCircle(circle, 4, Math.PI / 2);
var coordinates = polygon.getLinearRing(0).getCoordinates();
expect(coordinates[4]).to.eql(coordinates[0]);
expect(coordinates[0][0]).to.roughlyEqual(0, 1e-9);
expect(coordinates[0][1]).to.roughlyEqual(1, 1e-9);
});
});
});
goog.require('ol.extent');
goog.require('ol.geom.Circle');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LinearRing');
goog.require('ol.geom.Polygon');