I have created a ball to intersect with some objects on my interface when it bounces off the paddle (as in the breakout game) however when I compile by Actor I get an error message saying
cannot find symbol - variable goldEgg. what can I do?
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* The Robot of the game. It moves and bounces off the walls and the paddle.
*
* @author
* @version (Version 1.0)
*/
public class Robot extends Actor
{
private int deltaX; // delat is movement in the x direction
private int deltaY; // delta is movement in the y direction
private int count = 2;
private boolean fixed = true; // ????
public Robot()
{
}
/**
* Act. Move the Robot if we're not fixed to paddle.
*/
public void act()
{
if (!fixed)
{
move();
makeSmoke();
checkOut();
checkEggs();
}
}
/**
* Move the Robot. Thencheck what we've hit.
*/
public void move()
{
setLocation (getX() + deltaX, getY() + deltaY);
checkPaddle();
checkWalls();
}
/**
* Check whether we've hit one of the three walls. Reverse direction
*/
private void checkWalls()
{
if (getX() == 0 || getX() == getWorld().getWidth()-1) {
deltaX = -deltaX;
}
if (getY() == 0) {
deltaY = -deltaY;
}
}
/**
* Check whether we're out (bottom of screen).
*/
private void checkOut()
{
if (getY() == getWorld().getHeight()-1) {
((SquareWorld) getWorld()).RobotIsOut();
getWorld().removeObject(this);
}
}
/**
* Check whether we have hit an egg, and make the egg disappear if we have
*/
private void checkEggs()
{
Actor egg = getOneIntersectingObject(goldEgg.class);
if (goldEgg != null)
{
getWorld().removeObject(goldEgg);
deltaY = -deltaY;
}
}
private void checkPaddle()
{
Actor paddle = getOneIntersectingObject(Paddle.class);
if (paddle != null) {
deltaY = -deltaY;
int offset = getX() - paddle.getX();
deltaX = deltaX + (offset/10);
if (deltaX> 7) {
deltaX = 7;
}
if (deltaX < -7) {
deltaX = -7;
}
SquareWorld mySquareWorld = (SquareWorld) getWorld();
mySquareWorld.score();
}
}
/**
* Move the Robot a given distance sideways
*/
public void move(int dist)
{
setLocation (getX() + dist, getY());
}
/**
* Put out a puff of smoke (only on every second call).
*/
private void makeSmoke()
{
count--;
if (count == 0) {
getWorld().addObject ( new Smoke(), getX(), getY());
count = 2;
}
}
/**
* Release the Robot from the paddle.
*/
public void release()
{
deltaX = Greenfoot.getRandomNumber(11) - 5;
deltaY = -5;
fixed = false;
}
}
