package org.lwjgl.examples.spaceinvaders;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Canvas;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
public class GameApplet extends Applet {
/** The Canvas where the LWJGL Display is added */
Canvas display_parent;
/** Thread which runs the main game loop */
Thread gameThread;
/** The Game instance */
Game game;
/**
* Once the Canvas is created its add notify method will call this method to
* start the LWJGL Display and game loop in another thread.
*/
public void startLWJGL() {
gameThread = new Thread() {
public void run() {
try {
Display.setParent(display_parent);
} catch (LWJGLException e) {
e.printStackTrace();
}
// start game
game = new Game(false);
game.execute();
}
};
gameThread.start();
}
/**
* Tell game loop to stop running, after which the LWJGL Display will be destoryed.
* The main thread will wait for the Display.destroy() to complete
*/
private void stopLWJGL() {
Game.gameRunning = false;
try {
gameThread.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public void start() {
}
public void stop() {
}
/**
* Applet Destroy method will remove the canvas, before canvas is destroyed it will notify
* stopLWJGL() to stop main game loop and to destroy the Display
*/
public void destroy() {
remove(display_parent);
super.destroy();
System.out.println("Clear up");
}
/**
* initialise applet by adding a canvas to it, this canvas will start the LWJGL Display and game loop
* in another thread. It will also stop the game loop and destroy the display on canvas removal when
* applet is destroyed.
*/
public void init() {
setLayout(new BorderLayout());
try {
display_parent = new Canvas() {
public void addNotify() {
super.addNotify();
startLWJGL();
}
public void removeNotify() {
stopLWJGL();
super.removeNotify();
}
};
display_parent.setSize(getWidth(),getHeight());
add(display_parent);
display_parent.setFocusable(true);
display_parent.requestFocus();
display_parent.setIgnoreRepaint(true);
setVisible(true);
} catch (Exception e) {
System.err.println(e);
throw new RuntimeException("Unable to create display");
}
}
}