public class man extends Animal
{
    private int vSpeed = 0;
    private int acceleration = 2; 
    private boolean jumping;
    private int jumpStrenght= 20;
    private int speed= 4;

    public void act() 
    {
        checkFall();
        checkKeys();
    }
    
    public void checkKeys()
    {
        if(Greenfoot.isKeyDown("space") && jumping == false)
        {
            jump();
        }
        
        if(Greenfoot.isKeyDown("right"))
        {
            move(5);
        }
        
        if(Greenfoot.isKeyDown("left"))
        {
            move(-5);
        }
    }

    
    public void fall()
    {
        setLocation(getX(), getY()+vSpeed);  

        vSpeed = vSpeed + acceleration;  
        jumping= true;
    }

    public boolean onGround()
    {
        int spriteHeight= getImage().getHeight();
        int LookForGround= (int) (spriteHeight/2) + 5;

        Actor ground= getOneObjectAtOffset(0, LookForGround, Platform.class);

        if(ground == null)
        {
            jumping = true;
            return false;
        }
        else
        {
            return true;
        }
    }

    public void checkFall()
    {
        if(onGround())
        {
            vSpeed = 0;
        }
        else
        {
            fall(); 
        } 
    }
    
    public void jump()
    {
        vSpeed= vSpeed- jumpStrenght;
        jumping = true;
        fall();
         if(Greenfoot.isKeyDown("space") && jumping == false)
        {
            jump();
        }
    }
}