Use an ImageLayer in wms-custom-proj example

examples/wms-custom-proj.js

@@ -10,7 +10,9 @@ goog.require('ol.Projection');
 goog.require('ol.ProjectionUnits');
 goog.require('ol.RendererHints');
 goog.require('ol.View2D');
+goog.require('ol.layer.ImageLayer');
 goog.require('ol.layer.TileLayer');
+goog.require('ol.source.SingleImageWMS');
 goog.require('ol.source.TiledWMS');
 
 
@@ -24,6 +26,17 @@ var epsg21781 = new ol.Projection('EPSG:21781', ol.ProjectionUnits.METERS,
     new ol.Extent(485869.5728, 76443.1884, 837076.5648, 299941.7864));
 ol.Projection.addProjection(epsg21781);
 
+// We give the single image source a set of resolutions. This prevents the
+// source from requesting images of arbitrary resolutions.
+var projectionExtent = epsg21781.getExtent();
+var maxResolution = Math.max(
+    projectionExtent.maxX - projectionExtent.minX,
+    projectionExtent.maxY - projectionExtent.minY) / 256;
+var resolutions = new Array(10);
+for (var i = 0; i < 10; ++i) {
+  resolutions[i] = maxResolution / Math.pow(2.0, i);
+}
+
 var extent = new ol.Extent(420000, 30000, 900000, 350000);
 var layers = new ol.Collection([
   new ol.layer.TileLayer({
@@ -41,8 +54,8 @@ var layers = new ol.Collection([
       extent: extent
     })
   }),
-  new ol.layer.TileLayer({
+  new ol.layer.ImageLayer({
-    source: new ol.source.TiledWMS({
+    source: new ol.source.SingleImageWMS({
       url: 'http://wms.geo.admin.ch/',
       attributions: [new ol.Attribution(
           '&copy; ' +
@@ -50,7 +63,7 @@ var layers = new ol.Collection([
           'National parks / geo.admin.ch</a>')],
       params: {'LAYERS': 'ch.bafu.schutzgebiete-paerke_nationaler_bedeutung'},
       projection: epsg21781,
-      extent: extent
+      resolutions: resolutions
     })
   })
 ]);