private void pixel(double x,double y){
  offscreen.fillRect((int)Math.round(scaleX(x)),(int)Math.round(scaleY(y)),1,1);
}

private void pixel ( double x , double y ) { offscreen . fillRect ( ( int ) Math . round ( scaleX ( x ) ) , ( int ) Math . round ( scaleY ( y ) ) , 1 , 1 ) ; }
draws one pixel at ( x , y ) .
