Java Reference
In-Depth Information
To draw the stickmen, we need to modify the
paintComponent
method in the
BreakoutPanel
class. Of course, we also need to check that there are any lives left be-
fore we draw anything in the method. Here is the rewritten code.
class
BreakoutPanel
{
private
Player player =
new
Player () ;
...
public void
paintComponent(Graphics g)
{
super
. paintComponent(g) ;
Graphics2D g2 = (Graphics2D) g ;
if
(!player . isAlive())
{
showMessage(
"GAME OVER!"
,g2);
return
;
}
player .draw(g2) ;
ball .draw(g2);
paddle .draw(g2) ;
}
public void
showMessage( String s , Graphics2D g2)
{
Font myFont =
new
Font(
"SansSerif"
, Font .BOLD + Font . ITALIC, 40) ;
g2. setFont(myFont) ;
g2 . setColor (Color .RED) ;
Rectangle2D textBox = myFont. getStringBounds(s , g2.
getFontRenderContext () ) ;
g2. drawString(s , (
int
) (getWidth() / 2
−
textBox . getWidth() / 2) , (
int
) (getHeight () / 2
−
textBox . getHeight ())) ;
}
}
We also need to modify the code when the ball goes under the paddle. Instead of exiting
the program, we will start moving the ball upward and kill the player (i.e., remove one life).
class
TimeListener
implements
ActionListener
{
public void
actionPerformed(ActionEvent e)
{
Ball newBall = ball . getVirtualBall () ;
if
(newBall . intersects (paddle))
{
ba l l . goUp ( ) ;
if
(newBall . getX() + newBall . getWidth() / 2
<
paddle .getX() +
paddle . getWidth() / 2)
{
ball . goLeft () ;
}
else
{
ball . goRight () ;
}
}
>
−
{
else if
(ball.getY()
paddle .getY()
paddle . getHeight () )
ba l l . goUp ( ) ;
player. killPlayer() ;
}
ball .move() ;
repaint () ;
}
}
}
If you run the game now, three stickmen will appear. Every time we are unable to catch
the ball with the paddle, a stickman will be lost. When we lose all three stickmen, the
message
GAME OVER
will appear.
