BouncingBall.java in pgm

BouncingBall.java

public class BouncingBall 

{ 

 public static void main(String[] args) 

{

        StdDraw.setXscale(-1.0, 1.0);

        StdDraw.setYscale(-1.0, 1.0);

        double rx = 0.480, ry = 0.860;     

        double vx = 0.015, vy = 0.023;     

        double radius = 0.05;              

         while (true)  

            { 

            if (Math.abs(rx + vx) > 1.0 - radius) vx = -vx;

            if (Math.abs(ry + vy) > 1.0 - radius) vy = -vy;

            rx = rx + vx; 

            ry = ry + vy; 

            StdDraw.setPenColor(StdDraw.GRAY);

            StdDraw.filledSquare(0, 0, 1.0);

            StdDraw.setPenColor(StdDraw.BLACK); 

            StdDraw.filledCircle(rx, ry, radius); 

            StdDraw.show(20); 

        } 

    } 

}