u.p("paint ending");
    public void paintComponent( Graphics g ) {        //g.setColor(Color.blue);        //g.drawLine(0,0,50,50);        u.p("paint() size = " + this.getSize());        //u.p("viewport size = " + this.viewport.getSize());        //u.p("w/o scroll = " + this.viewport.getViewportBorderBounds());        if ( anti_aliased ) {            ( (Graphics2D)g ).setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );        }        doPaint( g );        u.p("paint ending");    }