/*************************************************************************
* Name:
* Login:
* Precepts:
*
* Description: Implementation of a 2-d bouncing ball in the box from
* (-1, -1) to (1, 1).
*
* Dependencies: StdDraw.java StdAudio.java
* http://www.cs.princeton.edu/introcs/15inout/laser.wav
* http://www.cs.princeton.edu/introcs/15inout/pop.wav
* http://www.cs.princeton.edu/introcs/15inout/earth.gif
*************************************************************************/
public class DeluxeBouncingBall {
public static void main(String[] args) {
double rx = .480, ry = .860; // position
double vx = .015, vy = .023; // velocity
double radius = .03; // a hack since "earth.gif" is in pixels
// set the scale of the coordinate system
StdDraw.setXscale(-1.0, 1.0);
StdDraw.setYscale(-1.0, 1.0);
// main animation loop
while (true) {
if (Math.abs(rx + vx) + radius > 1.0) { vx = -vx; StdAudio.play("laser.wav"); }
if (Math.abs(ry + vy) + radius > 1.0) { vy = -vy; StdAudio.play("pop.wav"); }
rx = rx + vx;
ry = ry + vy;
StdDraw.clear();
StdDraw.picture(rx, ry, "earth.gif");
StdDraw.show(20);
}
}
}