COS126

• Download Ball.java

 /*************************************************************
 *  Name:
 *  NetID:
 *  Precept:
 *
 *  Description: Object-oriented implementation of a 2-D
 *  bouncing ball.
 *************************************************************/

public class Ball {

    // declare instance variables
    _____________________________________________   // position
    _____________________________________________   // velocity
    _____________________________________________   // radius

    // other instance variables? up to you

    // constructor
    public Ball() {
        // always start ball position at (0, 0)



        // initial velocity and size generated randomly




    }


    // draw the ball, but not the background
    public void draw() {


    }


    // bounce off vertical wall by reflecting x-velocity
    private void bounceOffVerticalWall() {

    }

    // bounce off horizontal wall by reflecting y-velocity
    private void bounceOffHorizontalWall() {

    }


    // move the ball one step, but don't draw it
    public void move() {
        // bounce off wall(s) if you are near the border



       // update position using unit change in time



    }

    // test client to create and animate just 2 balls.
    // this part is already complete.
    public static void main(String[] args) {
        // create and initialize two balls
        Ball b1 = new Ball();
        Ball b2 = new Ball();

        StdOut.println(b1.toString());
        StdOut.println(b1); // call to toString() implied!

        // initialize standard drawing
        StdDraw.setXscale(-1.0, +1.0);
        StdDraw.setYscale(-1.0, +1.0);
        StdDraw.enableDoubleBuffering();

        // main animation loop
        while (true) {
            StdDraw.clear(StdDraw.GRAY);
            StdDraw.setPenColor(StdDraw.BLACK);
            b1.move();
            b2.move();
            b1.draw();
            b2.draw();
            StdDraw.show();
            StdDraw.pause(20);
        }
    }
}