Object rotation plugin for usco viewer

object-rotate-plugin.html

<polymer-element name="object-rotate-plugin"  >
  <script>
    Polymer("object-rotate-plugin",{
      methodsToInject: ["rotateSelection"],
      attached:function(){
        this.injectInParent();
      },
      injectInParent: function() {
        var parentNode = undefined;
        //this tricks allows plugins to be added both at the <template> level 
        //of an element, and at its instanciation
        if(this.parentNode)      parentNode = this.parentNode;
        if(this.parentNode.host) parentNode = this.parentNode.host;
        
        if (parentNode.injectPlugin && !this.objectParent) {
          this.objectParent = parentNode;
          parentNode.injectPlugin(this);
        }
      },
      //this method will get added to the viewer
      rotateSelection:function(axis, angle){
        if(!this.selectedObject) return;
        
        var axis  = axis === undefined ? 'x': axis;
        var angle = angle === undefined ? 0: angle;
        
        if((["x","y","z"]).indexOf(axis) === -1){
         throw new Error("'"+axis + "' is not a valid rotation axis");
        }
        
        //convert to radians
        angle = angle * Math.PI /180;
        this.selectedObject.rotation[axis] += angle;
      }
    });
    </script>
</polymer>