import objectdraw.*;
import java.awt.*;


/**
 * Create an array of basketballs and bounce them,
 * but only create balls when you click.
 */
public class BBallArray extends WindowController {
    
    private int MAX_BALLS = 10;
    private int BALL_X = 20;
    private int BALL_Y = 200;
    private int BALL_STEP = 30;
    private int BALL_SIZE = 20;
    
    private BBall[] balls;
    private int ballCount;  // how many balls we've already created.
    
    public void begin() {
        balls = new BBall[MAX_BALLS];
        ballCount = 0;
    }
    
    /*
     * If there is space left in the array, add a new ball. 
     */
    public void onMouseClick(Location pt) {
        if (ballCount < MAX_BALLS) {
          balls[ballCount] = new BBall(BALL_X + BALL_STEP * ballCount,
                                       BALL_Y,
                                       BALL_SIZE,
                                       canvas);
          ballCount++;                                              
        }
    }
    
    /*
     * Pick a ball and bounce it.  Note that we must create a new generator
     * each time...
     */
    public void onMouseExit(Location pt) {
        RandomIntGenerator ballPicker = new RandomIntGenerator(0, ballCount - 1);
        new Bouncer(balls[ballPicker.nextValue()]);
    }

}