Java Reference
In-Depth Information
// game over? (part of step 2 in a game loop)
// the rest of step 2 (processing the game logic)
// is in the TargetClickPanel and Target classes
if (score == gameLength) {
endGame();
}
// redraw the playing field (step 3 in a game loop)
targetClickPanel.repaint();
}
// A convenience method for showing the time and score
private void updateScorePanel() {
elapsedTime = System.currentTimeMillis() - startTime;
timeDisplayLabel.setText(Long.toString(elapsedTime / 1000));
scoreDisplayLabel.setText(Integer.toString(score));
}
// What to do when the game ends - part of the game logic
private void endGame() {
timer.stop();
String scoreString = "You clicked " + gameLength +
" targets in " + (elapsedTime / 1000) + " seconds";
int option;
option = JOptionPane.showConfirmDialog(frame, scoreString
+ " Play again?", "Game Over",
JOptionPane.YES_NO_OPTION);
if (option == 1) {
System.exit(0);
} else {
newGame();
}
}
// What to do when the user starts a new game
private void newGame() {
score = 0;
scoreDisplayLabel.setText("0");
startTime = System.currentTimeMillis();
timeDisplayLabel.setText("0");
if (!timer.isRunning()) {
timer.start();
}
}
}
Nearly all of the
TargetClick
class creates and manages the user interface. The
actionPerformed
method contains part of the game logic (with the rest in the
TargetClickPanel
and
Target
classes, which
we'll soon see). The
endGame
and
startGame
methods show those places where user interface code
meshes with game logic. The
endGame
method has just enough logic to stop the timer. The rest of the
endGame
method provides the user with a way to either start a new game or exit. The
newGame
method
resets everything (including the user interface) and starts a new game.
