code: public void setStartAngle(final double ANGLE) {
          if (null == startAngle) {
              _startAngle = Helper.clamp(0.0, 360.0, ANGLE);
              fireUpdateEvent(RECALC_EVENT);
          } else {
              startAngle.set(ANGLE);
          }
      }
docs: Defines the angle in degree that defines the start of the scale with
  it's minValue in a radial gauge. If set to 0 the scale will start at
  the bottom center and the direction of counting is mathematical correct
  counter-clockwise.
  Means if you would like to start the scale on the left side in the
  middle of the gauge height the startAngle should be set to 270 degrees.
  
  @param ANGLE