Paintbrush notes:Resize on the fly:

Call this method from paint:

public void resizeApplet()
{        
   //ths desired width is the width of the applet minus the toolpanel - a bit more for the border
   int widthDesired=getSize().width-toolPanel.getSize().width-10; 
   int heightDesired=getSize().height-colorPanel.getSize().height-10;
   drawingPanel.setPreferredSize(new Dimension(widthDesired,heightDesired));
   Container screen= getContentPane();
   screen.removeAll();
   screen.add(toolPanel);
   screen.add(drawingPanel);
   screen.add(colorPanel);
   validate();
}