I am suppose to pick a # between 1-4 for my vertical speed at random with a 50% chance to go up or down. Same with my left and right and I have no clue what I'm doing wrong...
PLZ I need help :(
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Ball here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Ball extends Actor
{
private int ySpeed;
private int xSpeed;
private int wait;
private int random;
public Ball()
{
ySpeed = 3; //do not really need constructor call
xSpeed = 3;
wait = 80;
random = Greenfoot.getRandomNumber(3)+1;
}
/**
* 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()
{
//ballMove();
//bounceOffPaddle();
bouncOffWalls();
if (wait == 0)
{
ballMove();
}
else
{
wait --;
}
}
// public void ballMove()
// {
// setLocation(getX() +xSpeed, getY() +ySpeed);
// }
/**
* Move the ball
*/
public void ballMove() // NEW MOVE METHOD
{
if (getY() == 0 || getY() == 500-1)
{
((PongWorld)getWorld()).updateScore(this);
setLocation( 350, 250 );
}
else
{
//setLocation (getX(Greenfoot.getRandomNumber(3)+1), getY(Greenfoot.getRandomNumber(3)+1));
//Greenfoot.getRandomNumber(random)<2);
RandomMove();
setLocation(getX()+xSpeed,getY()+ySpeed); //movement
bounceOffPaddle(); // new call for bounceOffPaddle
}
}
public void RandomMove()
{
if (Greenfoot.getRandomNumber(random)<2);
{
setRotation(Greenfoot.getRandomNumber(360));
}
}
public void bounceOffPaddle()
{
Paddle paddle = (Paddle) (getOneObjectAtOffset(0, 0, Paddle.class)); // tells ball paddle is here
if (paddle != null)
{
ySpeed = ySpeed * (-1);
}
}
public void bouncOffWalls()
{
if(getX() == 0 || getX() == 700-1) // use of logic or to condense two if statements
{
xSpeed = xSpeed * (-1);
}
// else ...........WHY NOT USE AN ELSE????
// {
// xSpeed = xSpeed * (-1);
// }
}
// public void bouncOffWalls() CAN BE CONDENSED A SINGLE IF STATEMENT...... HOW THOUGH??????
// {
// if(getX() == 0)
// {
// xSpeed = xSpeed +1;
// }
// if (getX() == 700-1)
// {
// xSpeed = xSpeed * (-1);
// }
// }
}
