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Add ol.Extent.transform

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This commit is contained in:
Tom Payne
2012-07-06 13:24:20 +02:00
committed by Tom Payne
parent 9368f05d1c
commit 4bdaf293b0
2 changed files with 28 additions and 0 deletions
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12
src/ol/extent.js
View File

@@ -1,6 +1,7 @@
goog.provide('ol.Extent');
goog.require('goog.math.Box');
goog.require('ol.TransformFunction');
@@ -26,3 +27,14 @@ goog.inherits(ol.Extent, goog.math.Box);
ol.Extent.prototype.clone = function() {
return new ol.Extent(this.top, this.right, this.bottom, this.left);
};
/**
* @param {ol.TransformFunction} transform Transform.
* @return {ol.Extent} Extent.
*/
ol.Extent.prototype.transform = function(transform) {
var topRight = transform(new goog.math.Coordinate(this.right, this.top));
var bottomLeft = transform(new goog.math.Coordinate(this.left, this.bottom));
return new ol.Extent(topRight.y, topRight.x, bottomLeft.y, bottomLeft.x);
};

16
src/ol/extent_test.js Normal file
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@@ -0,0 +1,16 @@
goog.require('goog.testing.jsunit');
goog.require('ol.Extent');
goog.require('ol.Projection');
function testTransform() {
var transform = ol.Projection.getTransformFromCodes('EPSG:4326', 'EPSG:3857');
var sourceExtent = new ol.Extent(60, 45, -30, -15);
var destinationExtent = sourceExtent.transform(transform);
assertNotNullNorUndefined(destinationExtent);
// FIXME check values with third-party tool
assertRoughlyEquals(8399737.889818361, destinationExtent.top, 1e-9);
assertRoughlyEquals(5009377.085697311, destinationExtent.right, 1e-9);
assertRoughlyEquals(-3503549.843504376, destinationExtent.bottom, 1e-9);
assertRoughlyEquals(-1669792.3618991037, destinationExtent.left, 1e-9);
}