COS126

• Download BouncingBallDeluxe.java

/******************************************************************************
 * Name:
 * NetID:
 * Precept:
 *
 * Description: Upgraded version of BouncingBall.java, as seen in Lecture 4D.
 ******************************************************************************/

public class BouncingBallDeluxe { 
    public static void main(String[] args) {

        // initial values
        double rx = 0.480, ry = 0.860;     // position
        double vx = 0.015, vy = 0.023;     // velocity
        double radius = 0.05;              // radius
        
        // set the scale of the coordinate system
        StdDraw.setXscale(-1.0, 1.0);
        StdDraw.setYscale(-1.0, 1.0);

        // main animation loop
        while (true)  { 

            // set the background to light gray
            StdDraw.setPenColor(StdDraw.LIGHT_GRAY);
            StdDraw.filledSquare(0.0, 0.0, 1.0);
            
            // bounce off wall according to law of elastic collision
            if (Math.abs(rx + vx) + radius > 1.0) {
                vx = -vx;
                StdAudio.play("pipebang.wav");
            }
            if (Math.abs(ry + vy) + radius > 1.0)  {
                vy = -vy;
                StdAudio.play("pipebang.wav");
            }

            // update position
            rx = rx + vx; 
            ry = ry + vy; 

            // draw ball on the screen
            StdDraw.picture(rx, ry, "TennisBall.png");

            // display and pause for 20 ms
            StdDraw.show(20); 
        } 
    } 
}