How to extend KineticJS shape

Question

For KineticJS version 4.0.0 or less a shape extended a class and could be extended by

var MyCircle = Kinetic.Circle.extend({
    init : func         


        

Answer 1

Kinetic.GlobalObject became Kinetic.Global (>4.0.1), then
Kinetic.Global is now Kinetic.Util (2013 versions), here is a solution:

(function() {
    Kinetic.MyCircle = function(config) {
        this._initMyCircle(config);
    };

    Kinetic.MyCircle.prototype = {
        _initMyCircle: function(config) {
            Kinetic.Circle.call(this, config);
            },
        myFunc : function(){
        }
    };

  Kinetic.Util.extend(Kinetic.MyCircle, Kinetic.Circle);
})();