Get the canvas position and size data.
@returns {Object} The result canvas data.
function getCanvasData() {
    var canvasData = this.canvasData;
    var data = {};

    if (this.ready) {
      forEach(['left', 'top', 'width', 'height', 'naturalWidth', 'naturalHeight'], function (n) {
        data[n] = canvasData[n];
      });
    }

    return data;
  }