Merge pull request #2847 from elemoine/zoomify-example

Constrain center in zoomify example

examples/zoomify.js

@@ -45,6 +45,9 @@ var map = new ol.Map({
   view: new ol.View({
     projection: proj,
     center: imgCenter,
-    zoom: 0
+    zoom: 0,
+    // constrain the center: center cannot be set outside
+    // this extent
+    extent: [0, -imgHeight, imgWidth, 0]
   })
 });