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Add ol.geom.Polygon.fromExtent

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Éric Lemoine
2014-09-22 16:39:11 +02:00
parent dc0ff2eee8
commit 1ce43e323d
2 changed files with 33 additions and 0 deletions
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20
src/ol/geom/polygon.js
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@@ -374,3 +374,23 @@ ol.geom.Polygon.circular = function(sphere, center, radius, opt_n) {
ol.geom.GeometryLayout.XY, flatCoordinates, [flatCoordinates.length]);
return polygon;
};
/**
* Create a polygon from an extent. The layout used is `XY`.
* @param {ol.Extent} extent The extent.
* @return {ol.geom.Polygon} The polygon.
* @api
*/
ol.geom.Polygon.fromExtent = function(extent) {
var minX = extent[0];
var minY = extent[1];
var maxX = extent[2];
var maxY = extent[3];
var flatCoordinates =
[minX, minY, minX, maxY, maxX, maxY, maxX, minY, minX, minY];
var polygon = new ol.geom.Polygon(null);
polygon.setFlatCoordinates(
ol.geom.GeometryLayout.XY, flatCoordinates, [flatCoordinates.length]);
return polygon;
};

13
test/spec/ol/geom/polygon.test.js
View File

@@ -399,6 +399,19 @@ describe('ol.geom.Polygon', function() {
});
});
describe('ol.geom.Polygon.fromExtent', function() {
it('creates the correct polygon', function() {
var extent = [1, 2, 3, 5];
var polygon = ol.geom.Polygon.fromExtent(extent);
var flatCoordinates = polygon.getFlatCoordinates();
expect(flatCoordinates).to.eql(
[1, 2, 1, 5, 3, 5, 3, 2, 1, 2]);
var orientedFlatCoordinates = polygon.getOrientedFlatCoordinates();
expect(orientedFlatCoordinates).to.eql(
[1, 2, 1, 5, 3, 5, 3, 2, 1, 2]);
});
});
});