I am trying to get an instance of my wall class to move from the top to the bottom of the screen and repeat. I know this is easy but I am struggling with how to program it and would like some help. Here is my code:
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Zone here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Zone extends Actor
{
private int uSpeed = -8;
private int dSpeed = 8;
private boolean cats;
/**
* Act - do whatever the Zone wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
move();
atWorldEdge();
}
private void move()
{
if(getY() <= 300 || atWorldEdge())
{
cats = false;
}
if(atWorldEdge() || getY() > 300)
{
cats = true;
}
if(cats)
{
setLocation ( getX(), getY() + dSpeed);
}
if(!cats)
{
setLocation ( getX(), getY() + uSpeed);
}
}
public boolean atWorldEdge()
{
if(getX() < 1 || getX() > getWorld().getWidth() - 1)
return true;
if(getY() < 1 || getY() > getWorld().getHeight() - 1)
return true;
else
return false;
}
}
Currently it moves to the top of the screen and gets stuck I am trying to figure out how i can get it to keep changing a value so i can move it from the top to the bottom and back. Thanks in advance.
