Tim Schaub
33457c48de
In the typical sequence of parse-transform-render the most efficient place to transform coordinate values is deep within the parser immediately after values have been read (this would avoid a second pass over whatever structure is used to back geometries). To accomplish this transform during parsing, we could add back parser read options to pass the transform function around. Until then, a transform method on geometries is straightforward to implement. This means we do a second pass through coordinate structures to transform, but this is typically done only once immediately after parsing.
84 lines
2.2 KiB
JavaScript
84 lines
2.2 KiB
JavaScript
goog.provide('ol.test.geom.Point');
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describe('ol.geom.Point', function() {
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describe('constructor', function() {
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it('creates a point from an array', function() {
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var point = new ol.geom.Point([10, 20]);
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expect(point).to.be.a(ol.geom.Point);
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expect(point).to.be.a(ol.geom.Geometry);
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});
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it('throws when given with insufficient dimensions', function() {
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expect(function() {
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var point = new ol.geom.Point([1]);
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point = point; // suppress gjslint warning about unused variable
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}).to.throwException();
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});
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});
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describe('#dimension', function() {
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it('can be 2', function() {
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var point = new ol.geom.Point([10, 20]);
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expect(point.dimension).to.be(2);
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});
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it('can be 3', function() {
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var point = new ol.geom.Point([10, 20, 30]);
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expect(point.dimension).to.be(3);
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});
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});
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describe('#getBounds()', function() {
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it('returns the bounding extent', function() {
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var point = new ol.geom.Point([10, 20]);
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var bounds = point.getBounds();
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expect(bounds[0]).to.be(10);
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expect(bounds[2]).to.be(10);
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expect(bounds[1]).to.be(20);
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expect(bounds[3]).to.be(20);
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});
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});
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describe('#getCoordinates()', function() {
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it('returns an array', function() {
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var point = new ol.geom.Point([10, 20]);
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expect(point.getCoordinates()).to.eql([10, 20]);
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});
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});
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describe('#transform()', function() {
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var forward = ol.proj.getTransform('EPSG:4326', 'EPSG:3857');
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var inverse = ol.proj.getTransform('EPSG:3857', 'EPSG:4326');
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it('forward transforms a point in place', function() {
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var point = new ol.geom.Point([10, 20]);
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point.transform(forward);
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expect(point.get(0)).to.roughlyEqual(1113195, 1);
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expect(point.get(1)).to.roughlyEqual(2273031, 1);
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});
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it('inverse transforms a point in place', function() {
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var point = new ol.geom.Point([1113195, 2273031]);
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point.transform(inverse);
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expect(point.get(0)).to.roughlyEqual(10, 0.001);
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expect(point.get(1)).to.roughlyEqual(20, 0.001);
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});
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});
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});
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goog.require('ol.geom.Geometry');
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goog.require('ol.geom.Point');
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goog.require('ol.proj');
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