[ADD] GoeImage layer with getExtent #330

src/layer/GeoImage.js

@@ -0,0 +1,30 @@
+/*	Copyright (c) 2019 Jean-Marc VIGLINO,
+  released under the CeCILL-B license (French BSD license)
+  (http://www.cecill.info/licences/Licence_CeCILL-B_V1-en.txt).
+*/
+import ol_layer_Image from 'ol/layer/Image'
+import {ol_ext_inherits} from '../util/ext'
+
+/**
+ * @classdesc
+ * Image layer to use with a GeoImage source and return the extent calcaulted with this source.
+ * @extends {ol.layer.Image}
+ * @param {Object=} options Layer Image options.
+ * @api
+ */
+var ol_layer_GeoImage = function(options) {
+  ol_layer_Image.call(this, options);
+}
+ol_ext_inherits (ol_layer_GeoImage, ol_layer_Image);
+
+/**
+ * Return the {@link module:ol/extent~Extent extent} of the source associated with the layer.
+ * @return {ol.Extent} The layer extent.
+ * @observable
+ * @api
+ */
+ol_layer_GeoImage.prototype.getExtent = function() {
+  return this.getSource().getExtent();
+}
+
+export default ol_layer_GeoImage;