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Make Points transformable.

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This commit is contained in:
Marc Jansen
2012-06-20 14:58:37 +02:00
parent 33c2e0aa30
commit d933404df8
2 changed files with 72 additions and 1 deletions
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34
src/ol/geom/Point.js
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@@ -106,3 +106,37 @@ ol.geom.Point.prototype.setZ = function(z) {
this.z_ = z;
};
/**
* Transform this point to another coordinate reference system. This
* requires that this point has a projection set already (if not, an error
* will be thrown). Returns a new point object and does not modify this
* point.
*
* @param {string|!ol.Projection} proj The destination projection. Can be
* supplied as a projection instance of a string identifier.
* @returns {!ol.geom.Point} A new location.
*/
ol.geom.Point.prototype.transform = function(proj) {
if (goog.isString(proj)) {
proj = new ol.Projection(proj);
}
return this.transform_(proj);
};
/**
* Transform this point to a new location given a projection object.
*
* @param {!ol.Projection} proj The destination projection.
* @returns {!ol.geom.Point}
* @private
*/
ol.geom.Point.prototype.transform_ = function(proj) {
var point = {x: this.x_, y: this.y_};
var sourceProj = this.projection_;
if (!goog.isDefAndNotNull(sourceProj)) {
throw new Error("Cannot transform a point without a source projection.");
}
ol.Projection.transform(point, sourceProj, proj);
return new ol.geom.Point(point.x, point.y, this.z_, proj);
};