code: function sumPointIfInFreehand(dataHandles, point, workingSum, pixelValue) {
    if (pointInFreehand(dataHandles, point)) {
      workingSum.value += pixelValue;
      workingSum.squared += pixelValue * pixelValue;
      workingSum.count++;
    }
  }
docs: Adds the pixel to the workingSum if it is within the polygon.
  @private
  @method sumPointIfInFreehand
  
  @param {Object} dataHandles Data object associated with the tool.
  @param {Object} point The pixel coordinates.
  @param {Object} workingSum The working sum, squared sum and pixel count.
  @param {Object} pixelValue The pixel value. // @modifies {workingSum}
  @returns {undefined}