I'm making a snake game in Java and need to use user keystrokes to control the direction of the movement. Is this possible through a switch
statement? I was originally using a Scanner s = new Scanner(System.in)
to allow user to type 'u','d', etc. to move snake, but I would like to use the keyboard arrows instead.
Here is what I have right now:
public void controlSnake(){
Scanner s = new Scanner(System.in);
String inputString = s.next();
switch (inputString) {
case "u":
case "U":
snake.changeDirection(Point.NORTH);
break;
case "d":
case "D":
snake.changeDirection(Point.SOUTH);
break;
case "r":
case "R":
snake.changeDirection(Point.EAST);
break;
case "l":
case "L":
snake.changeDirection(Point.WEST);
break;
}
}
I was going to insert something like this, but not sure how to:
map1.put(KeyStroke.getKeyStroke("LEFT"), "moveLeft");
getActionMap().put("moveLeft", new AbstractAction() {
private static final long serialVersionUID = 1L;
public void actionPerformed(ActionEvent e) {
snake.changeDirection(Point.WEST);
}
});
What would be the best way to accomplish this?
I see you are using Swing. You can make use of KeyListener interface. Something like this.
yourButton.addKeyListener(new KeyListener(){
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_UP){
snake.changeDirection(Point.NORTH);
}
if(e.getKeyCode() == KeyEvent.VK_DOWN){
snake.changeDirection(Point.SOUTH);
}
//Likewise for left and right arrows
}
@Override
public void keyTyped(KeyEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void keyReleased(KeyEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
});