Leaflet/spec/suites/layer/vector/PolygonSpec.js

describe('Polygon', function () {

	var c = document.createElement('div');
	c.style.width = '400px';
	c.style.height = '400px';
	var map = new L.Map(c);
	map.setView(new L.LatLng(55.8, 37.6), 6);

	describe("#initialize", function () {
		it("should never be flat", function () {
			var latLngs = [[1, 2], [3, 4]];

			var polygon = new L.Polygon(latLngs);

			expect(polygon._flat(polygon._latlngs)).to.be(false);
			expect(polygon.getLatLngs()).to.eql(polygon._latlngs);
		});

		it("doesn't overwrite the given latlng array", function () {
			var originalLatLngs = [
				[1, 2],
				[3, 4]
			];
			var sourceLatLngs = originalLatLngs.slice();

			var polygon = new L.Polygon(sourceLatLngs);

			expect(sourceLatLngs).to.eql(originalLatLngs);
			expect(polygon._latlngs).to.not.eql(sourceLatLngs);
		});

		it("can be called with an empty array", function () {
			var polygon = new L.Polygon([]);
			expect(polygon._latlngs).to.eql([[]]);
			expect(polygon.getLatLngs()).to.eql(polygon._latlngs);
		});

		it("can be initialized with holes", function () {
			var originalLatLngs = [
				[ //external ring
					[0, 10], [10, 10], [10, 0]
				], [ //hole
					[2, 3], [2, 4], [3, 4]
				]
			];

			var polygon = new L.Polygon(originalLatLngs);

			expect(polygon._latlngs).to.eql([
				[L.latLng([0, 10]), L.latLng([10, 10]), L.latLng([10, 0])],
				[L.latLng([2, 3]), L.latLng([2, 4]), L.latLng([3, 4])]
			]);
			expect(polygon.getLatLngs()).to.eql(polygon._latlngs);
		});

		it("can be initialized with multi including hole", function () {
			var latLngs = [
				[[[10, 20], [30, 40], [50, 60]]],
				[[[0, 10], [10, 10], [10, 0]], [[2, 3], [2, 4], [3, 4]]]
			];

			var polygon = new L.Polygon(latLngs);

			expect(polygon._latlngs).to.eql([
				[[L.latLng([10, 20]), L.latLng([30, 40]), L.latLng([50, 60])]],
				[[L.latLng([0, 10]), L.latLng([10, 10]), L.latLng([10, 0])], [L.latLng([2, 3]), L.latLng([2, 4]), L.latLng([3, 4])]]
			]);
			expect(polygon.getLatLngs()).to.eql(polygon._latlngs);
		});
	});

	describe("#setLatLngs", function () {
		it("doesn't overwrite the given latlng array", function () {
			var originalLatLngs = [
				[1, 2],
				[3, 4]
			];
			var sourceLatLngs = originalLatLngs.slice();

			var polygon = new L.Polygon(sourceLatLngs);

			polygon.setLatLngs(sourceLatLngs);

			expect(sourceLatLngs).to.eql(originalLatLngs);
		});

		it("can be set external ring and holes", function () {
			var latLngs = [
				[ //external ring
					[0, 10], [10, 10], [10, 0]
				], [ //hole
					[2, 3], [2, 4], [3, 4]
				]
			];

			var polygon = new L.Polygon([]);
			polygon.setLatLngs(latLngs);

			expect(polygon.getLatLngs()).to.eql([
				[L.latLng([0, 10]), L.latLng([10, 10]), L.latLng([10, 0])],
				[L.latLng([2, 3]), L.latLng([2, 4]), L.latLng([3, 4])]
			]);
		});

		it("can be set multi including hole", function () {
			var latLngs = [
				[[[10, 20], [30, 40], [50, 60]]],
				[[[0, 10], [10, 10], [10, 0]], [[2, 3], [2, 4], [3, 4]]]
			];

			var polygon = new L.Polygon([]);
			polygon.setLatLngs(latLngs);

			expect(polygon.getLatLngs()).to.eql([
				[[L.latLng([10, 20]), L.latLng([30, 40]), L.latLng([50, 60])]],
				[[L.latLng([0, 10]), L.latLng([10, 10]), L.latLng([10, 0])], [L.latLng([2, 3]), L.latLng([2, 4]), L.latLng([3, 4])]]
			]);
		});

	});

	describe('#getCenter', function () {

		it('should compute center of a big simple polygon around equator', function () {
			var latlngs = [
				[[0, 0], [10, 0], [10, 10], [0, 10]]
			];
			var layer = new L.Polygon(latlngs).addTo(map);
			expect(layer.getCenter()).to.be.nearLatLng(L.latLng([5, 5]), 1e-1);
		});

		it('should compute center of a small simple polygon', function () {
			var latlngs = [
				[[0, 0], [0.010, 0], [0.010, 0.010], [0, 0.010]]
			];
			var layer = new L.Polygon(latlngs).addTo(map);
			map.setZoom(0);  // Make the polygon disappear in screen.
			expect(layer.getCenter()).to.be.nearLatLng(L.latLng([0, 0]));
		});

	});

});