question: protected void drawMarkHilighted ( Graphics2D g2 , float x , float y ) { Rectangle2D bounds = mark . getBounds2D ( ) ; float w = ( float ) bounds . getWidth ( ) ; float h = ( float ) bounds . getHeight ( ) ; x = x - ( w / 2 ) ; y = y - ( h / 2 ) ; g2 . translate ( x , y ) ; if ( hilightedMarkFillPaint != null ) { g2 . setPaint ( hilightedMarkFillPaint ) ; g2 . fill ( mark ) ; } g2 . setPaint ( hilightedMarkPaint ) ; g2 . setStroke ( hilightedMarkStroke ) ; g2 . draw ( mark ) ; g2 . translate ( - x , - y ) ; Rectangle2D rect = new Rectangle2D . Float ( x , y , w , h ) ; markBounds . add ( rect ) ; }
target:  Draw a mark transforming co-ordinates to each axis