BouncingBall.java

/* *****************************************************************************
 *  Name:              Ada Lovelace
 *  Coursera User ID:  123456
 *  Last modified:     October 16, 1842
 **************************************************************************** */

public class BouncingBall {
    public static void main(String[] args) {
        double x = 0.000, y = 0.000;
        StdDraw.setXscale(-1.0, +1.0);
        StdDraw.setYscale(-1.0, +1.0);
        double vx = 0.013, vy = 0.021;
        while (true) {
            StdDraw.setPenColor(StdDraw.LIGHT_GRAY);
            StdDraw.filledSquare(0.0, 0.0, 1.0);
            if (Math.abs(x + vx) + 0.05 > 1.0) vx = -vx;
            if (Math.abs(y + vy) + 0.05 > 1.0) vy = -vy;
            x = x + vx;
            y = y + vy;
            StdDraw.setPenColor(StdDraw.BLACK);
            StdDraw.filledCircle(x, y, 0.05);
            StdDraw.show(5);
        }
    }
}