import java.util.*;
import greenfoot.*;




| A little penguin that wants to get to the other side.
|
public class Pengu
extends Mover
{    
private static final int jumpStrength = 16;

    


| Check keyboard input and react accordingly.
|
public void act()
    {
        checkKeys();
        checkFall();
    }

    




    private void checkKeys()
    {
        if (Greenfoot.isKeyDown("left")) {
            setImage("pengu-left.png");
            moveLeft();
        }
        if (Greenfoot.isKeyDown("right")) {
            setImage("pengu-right.png");
            moveRight();
        }
        if (Greenfoot.isKeyDown("space")) {
            if (onGround()) {
                jump();
            }
        }
    }

    


| Start a jump action.
|
private void jump()
    {
        setVSpeed( - jumpStrength);
        fall();
    }

    


| Check whether we are falling. If so, fall. If we're on ground, stop the fall.
|
private void checkFall()
    {
        if (onGround()) {
            setVSpeed(0);
        }
        else {
            fall();
        }
    }
}