import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Executer here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Executer extends Animal
{
    public Executer()
    {
        getImage().setTransparency(0);
    }
    double ex = 280;
    double ey = 280;
    double rx;
    double ry;
    public void move(int r) //takes in rotation
    {
        rx = Math.cos(r);
        ry = Math.sin(r);
        ex += rx;
        ey += ry;
        Tank tank = (Tank)getWorld().getObjects(Tank.class).get(0);
        tank.setLocation((int) ex, (int) ey);
    }
    public void back(int r) //takes in rotation
    {
        rx = Math.cos(r);
        ry = Math.sin(r);
        ex -= rx;
        ey -= ry;
        Tank tank = (Tank)getWorld().getObjects(Tank.class).get(0);
        tank.setLocation((int) ex, (int) ey);
    }
}

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class Tank here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Tank extends Animal
{
    
    /**
     * Act - do whatever the Tank wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act() 
    {
        navigate();
    } 
    public void navigate()
    {
        if (Greenfoot.isKeyDown("w"))
        {
            Executer execute = (Executer)getWorld().getObjects(Executer.class).get(0);            
            execute.move(getRotation());
        }
        //if (Greenfoot.isKeyDown("s"))
        //{
        //    Executer execute = (Executer)getWorld().getObjects(Executer.class).get(0);
        //    execute.back(getRotation());
        //}
        if (Greenfoot.isKeyDown("a"))
        {
            turn(-1);
        }
        if (Greenfoot.isKeyDown("d"))
        {
            turn(1);
        }
    }
}