initialize(canvas, options, extendsOptions) {
      options = extend(options, extendsOptions);
      options.type = 'cropzone';

      this.callSuper('initialize', options);
      this._addEventHandler();

      this.canvas = canvas;
      this.options = options;
    }
Constructor
@param {Object} canvas canvas
@param {Object} options Options object
@param {Object} extendsOptions object for extends "options"
@override