In this project, I am creating a code where balls 'bounce' around the world and change color every time they bounce against the edge of the world. Every time a ball collides with another ball, one of the balls should disappear. However every time I try to run my code for that an error shows up. How can I make it so that one of the balls disappear when two balls collide?
private int imgNumber;
/**
* Create a ball.
*/
public Ball(int direction) {
setRotation(direction);
imgNumber = 0;
}
/**
* Act - do whatever the Ball wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
collision();
move(4);
getWorld().showText("Colored Balls:" + Integer.toString(ballcount), getWorld().getWidth()/2, 50);
if (isAtEdge()) { //change color of balls when bounce agaisnt edge of world
turn(getRotation()+Greenfoot.getRandomNumber(61)+150);
changeImage();
}
}
/**
* Change image of this ball
*/
public void changeImage() {
imgNumber++;
if (imgNumber == 5) {
imgNumber = 0;
}
setImage ("button-" + imgNumber + ".png");
}
public void collision() {
if (canSee (Animal.class)) {
getWorld().removeObject(this);
}
}