@Override public double java2DToValue(double java2DValue,Rectangle2D area,RectangleEdge edge){
  double result=0.0;
  if (this.displayStart < this.displayEnd) {
    result=super.java2DToValue(java2DValue,area,edge);
  }
 else {
  }
  return result;
}

@ Override public double java2DToValue ( double java2DValue , Rectangle2D area , RectangleEdge edge ) { double result = 0.0 ; if ( this . displayStart < this . displayEnd ) { result = super . java2DToValue ( java2DValue , area , edge ) ; } else { } return result ; }
translates a java2d coordinate into a data value .
