question: public void positionDialogRelativeToParent ( final JDialog dialog , final double horizontalPercent , final double verticalPercent ) { final Dimension d = dialog . getSize ( ) ; final Dimension p = mainFrame . getSize ( ) ; final int baseX = mainFrame . getX ( ) - d . width ; final int baseY = mainFrame . getY ( ) - d . height ; final int w = d . width + p . width ; final int h = d . height + p . height ; int x = baseX + ( int ) ( horizontalPercent * w ) ; int y = baseY + ( int ) ( verticalPercent * h ) ; final Rectangle s = getMaximumWindowBounds ( ) ; x = Math . min ( x , ( s . width - d . width ) ) ; x = Math . max ( x , 0 ) ; y = Math . min ( y , ( s . height - d . height ) ) ; y = Math . max ( y , 0 ) ; dialog . setBounds ( x + s . x , y + s . y , d . width , d . height ) ; }
target:  Positions the specified dialog at a position relative to its parent.