Add message to assertions.

2015-03-30 22:50:15 +02:00
parent 2c40d74a15
commit fb9ba22c30
45 changed files with 394 additions and 221 deletions
@@ -50,7 +50,8 @@ ol.renderer.canvas.Layer.prototype.composeFrame =
    var extent = layerState.extent;
    var clipped = goog.isDef(extent);
    if (clipped) {
-      goog.asserts.assert(goog.isDef(extent));
+      goog.asserts.assert(goog.isDef(extent),
+          'layerState extent is defined');
      var pixelRatio = frameState.pixelRatio;
      var topLeft = ol.extent.getTopLeft(extent);
      var topRight = ol.extent.getTopRight(extent);