function ImageZone(imageData, x, y, d) {
      var _this;
      _this = _Zone.call(this) || this;
      _this.reset(imageData, x, y, d);
      return _this;
    }
Creates an ImageZone.
@param {ImageData} imageData - The image data to use for the zone.
@param {number} [x=0] - The x-coordinate offset.
@param {number} [y=0] - The y-coordinate offset.
@param {number} [d=2] - The sampling density.