Implement read/write transforms for ol.format.GPX

src/ol/format/xmlfeatureformat.js

@@ -5,6 +5,7 @@ goog.require('goog.asserts');
 goog.require('goog.dom.NodeType');
 goog.require('ol.format.Feature');
 goog.require('ol.format.FormatType');
+goog.require('ol.proj');
 goog.require('ol.xml');
 
 
@@ -243,3 +244,36 @@ ol.format.XMLFeature.prototype.writeGeometry = function(geometry, opt_options) {
  * @return {Node} Node.
  */
 ol.format.XMLFeature.prototype.writeGeometryNode = goog.abstractMethod;
+
+
+/**
+ * @param {Array.<ol.Feature>} features Features.
+ * @param {boolean} write Set to true for writing, false for reading. For
+ *     writing, the features will be cloned before transforming.
+ * @param {(olx.format.WriteOptions|olx.format.ReadOptions)=} opt_options
+ *     Options.
+ * @protected
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.XMLFeature.transformFeaturesWithOptions = function(
+    features, write, opt_options) {
+  var featureProjection = goog.isDef(opt_options) ?
+      ol.proj.get(opt_options.featureProjection) : null;
+  var dataProjection = goog.isDef(opt_options) ?
+      ol.proj.get(opt_options.dataProjection) : null;
+
+  if (!goog.isNull(featureProjection) && !goog.isNull(dataProjection) &&
+      !ol.proj.equivalent(featureProjection, dataProjection)) {
+    if (write) {
+      features = goog.array.map(features, function(feature) {
+        return feature.clone();
+      });
+    }
+
+    goog.array.forEach(features, function(feature) {
+      feature.setGeometry(ol.format.Feature.transformWithOptions(
+          feature.getGeometry(), write, false, opt_options));
+    });
+  }
+  return features;
+};