Pause the game until key pressed

Newbie & Debugging Questions
#1

Hello JGO community! newb here.

I’m using LWJGL to create a small game that should have the ability the be paused (preferably by ESC key) and unpaused (the same way).
I’m guessing I could do it with threads wait/notify but I was hoping there would be an easier method.

thanks,
B.

#2

How about skipping the game ticking if the game is paused.


boolean isPaused = false;
//The update method
public void update() {
  if (isKeyDown(KEY_ESCAPE))
            isPaused = !isPaused;
  if(!isPaused) {
    //update the game
  }
}

I’m quite new to this too, it’s just an idea.

#3

Here is my keyboardhandler class.


public class KeyboardHandler {

	public List<Character> charsPressed = new ArrayList<Character>();

	public KeyboardHandler() {
	}

	private void processInput() {

		while (Keyboard.next()) {

			int key = Keyboard.getEventKey();
			boolean state = Keyboard.getEventKeyState();

			charsPressed.add(Keyboard.getEventCharacter());

			toggle(key, state);

		}

	}

	private void toggle(int keycode, boolean state) {
		for (Key key : keys) {
			if (key.keycode == keycode) key.toggle(state);
		}
	}

	public void tick() {

		processInput();

		for (Key key : keys) {
			key.tick();
		}
	}
	
	public void releaseAll() {
		for(int i=0;i<keys.size();i++) {
			keys.get(i).pressed = false;
			keys.get(i).down = false;
		}
	}


	public List<Key> keys = new ArrayList<Key>();
	
	public Key KEY_W = new Key(Keyboard.KEY_W);
	public Key KEY_A = new Key(Keyboard.KEY_A);
	public Key KEY_S = new Key(Keyboard.KEY_S);
	public Key KEY_D = new Key(Keyboard.KEY_D);

	public Key KEY_CTRL = new Key(Keyboard.KEY_LCONTROL);
	public Key KEY_R = new Key(Keyboard.KEY_R);
	public Key KEY_T = new Key(Keyboard.KEY_T);

	public Key KEY_K = new Key(Keyboard.KEY_K);

	public Key KEY_V = new Key(Keyboard.KEY_V);



	public class Key {

		public int keycode;

		public boolean down = false, pressed = false;
		private boolean wasDown = false;

		public Key(int keycode) {
			this.keycode = keycode;
			keys.add(this);
		}

		public void toggle(boolean bool) {
			down = bool;
		}

		public void tick() {

			if (!wasDown && down) {
				pressed = true;
			} else {
				pressed = false;
			}

			wasDown = down;
		}

	}

}

You need to call KeyboardHandler.tick method every time you update your game. Key.down is a boolean which says if key is currently down. Key.pressed is a boolean which says if the key was pressed.

#4

@Kefwar
well, yeah I suppose I could do that. didn’t think of it :slight_smile:

@trollwarrior1
what’s the difference between a key that is ‘down’ and ‘pressed’?

#5

Key Pressed should just be the Moment when they Key actually pressed while Key Down repeatly is true when the Key is still Down

#6

pressed only happens once. When you press key. if(!wasDown && down) that will trigger once when they key wasn’t down and is down.

down is always true when key is down.