48 lines
1.7 KiB
JavaScript
48 lines
1.7 KiB
JavaScript
goog.provide('ol.test.projection.EPSG3857');
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describe('ol.projection.EPSG3857', function() {
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describe('getPointResolution', function() {
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it('returns the correct point scale at the equator', function() {
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// @see http://msdn.microsoft.com/en-us/library/aa940990.aspx
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var epsg3857 = ol.projection.get('EPSG:3857');
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var resolution = 19.11;
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var point = [0, 0];
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expect(epsg3857.getPointResolution(resolution, point)).
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to.roughlyEqual(19.11, 1e-1);
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});
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it('returns the correct point scale at the latitude of Toronto',
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function() {
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// @see http://msdn.microsoft.com/en-us/library/aa940990.aspx
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var epsg3857 = ol.projection.get('EPSG:3857');
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var epsg4326 = ol.projection.get('EPSG:4326');
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var resolution = 19.11;
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var point = ol.projection.transform([0, 43.65], epsg4326, epsg3857);
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expect(epsg3857.getPointResolution(resolution, point)).
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to.roughlyEqual(19.11 * Math.cos(Math.PI * 43.65 / 180), 1e-9);
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});
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it('returns the correct point scale at various latitudes', function() {
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// @see http://msdn.microsoft.com/en-us/library/aa940990.aspx
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var epsg3857 = ol.projection.get('EPSG:3857');
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var epsg4326 = ol.projection.get('EPSG:4326');
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var resolution = 19.11;
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var latitude;
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for (latitude = 0; latitude < 90; ++latitude) {
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var point = ol.projection.transform([0, latitude], epsg4326, epsg3857);
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expect(epsg3857.getPointResolution(resolution, point)).
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to.roughlyEqual(19.11 * Math.cos(Math.PI * latitude / 180), 1e-9);
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}
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});
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});
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});
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goog.require('ol.projection');
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goog.require('ol.projection.EPSG3857');
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