Example sources in the examples dir

examples/wms-image-custom-proj.js

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+goog.require('ol.Attribution');
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.control');
+goog.require('ol.control.ScaleLine');
+goog.require('ol.layer.Image');
+goog.require('ol.proj');
+goog.require('ol.proj.Projection');
+goog.require('ol.source.ImageWMS');
+
+
+// Transparent Proj4js support:
+//
+// EPSG:21781 is known to Proj4js because its definition was loaded in the html.
+// Now when we create an ol.proj.Projection instance with the 'EPSG:21781' code,
+// OpenLayers will pick up parameters like units and transform functions from
+// Proj4js.
+//
+// Note that we are setting the projection's extent here, which is used to
+// determine the view resolution for zoom level 0. Recommended values for a
+// projection's validity extent can be found at http://epsg.io/.
+//
+// If you use Proj4js only to transform coordinates, you don't even need to
+// create an ol.proj.Projection instance. ol.proj.get() will take care of it
+// internally.
+
+var projection = new ol.proj.Projection({
+  code: 'EPSG:21781',
+  extent: [485869.5728, 76443.1884, 837076.5648, 299941.7864]
+});
+
+var extent = [420000, 30000, 900000, 350000];
+var layers = [
+  new ol.layer.Image({
+    extent: extent,
+    source: new ol.source.ImageWMS({
+      url: 'http://wms.geo.admin.ch/',
+      crossOrigin: 'anonymous',
+      attributions: [new ol.Attribution({
+        html: '© ' +
+            '<a href="http://www.geo.admin.ch/internet/geoportal/' +
+            'en/home.html">' +
+            'Pixelmap 1:1000000 / geo.admin.ch</a>'
+      })],
+      params: {
+        'LAYERS': 'ch.swisstopo.pixelkarte-farbe-pk1000.noscale',
+        'FORMAT': 'image/jpeg'
+      },
+      serverType: /** @type {ol.source.wms.ServerType} */ ('mapserver')
+    })
+  }),
+  new ol.layer.Image({
+    extent: extent,
+    source: new ol.source.ImageWMS({
+      url: 'http://wms.geo.admin.ch/',
+      crossOrigin: 'anonymous',
+      attributions: [new ol.Attribution({
+        html: '&copy; ' +
+            '<a href="http://www.geo.admin.ch/internet/geoportal/' +
+            'en/home.html">' +
+            'National parks / geo.admin.ch</a>'
+      })],
+      params: {'LAYERS': 'ch.bafu.schutzgebiete-paerke_nationaler_bedeutung'},
+      serverType: /** @type {ol.source.wms.ServerType} */ ('mapserver')
+    })
+  })
+];
+
+var map = new ol.Map({
+  controls: ol.control.defaults().extend([
+    new ol.control.ScaleLine()
+  ]),
+  layers: layers,
+  renderer: exampleNS.getRendererFromQueryString(),
+  target: 'map',
+  view: new ol.View({
+    projection: projection,
+    center: ol.proj.fromLonLat([8.23, 46.86], projection),
+    extent: extent,
+    zoom: 2
+  })
+});