Your first animation using java!!!
Standard Drawing: Animation and images Images.
/******************************************************************************
* Compilation: javac BouncingBall.java
* Execution: java BouncingBall
* Dependencies: StdDraw.java
*
* Implementation of a 2-d bouncing ball in the box from (-1, -1) to (1, 1).
*
* % java BouncingBall
*
******************************************************************************/
public class BouncingBall {
public static void main(String[] args) {
// set the scale of the coordinate system
StdDraw.setXscale(-1.0, 1.0);
StdDraw.setYscale(-1.0, 1.0);
StdDraw.enableDoubleBuffering();
// initial values
double rx = 0.480, ry = 0.860; // position
double vx = 0.015, vy = 0.023; // velocity
double radius = 0.05; // radius
// main animation loop
while (true) {
// bounce off wall according to law of elastic collision
if (Math.abs(rx + vx) > 1.0 - radius) vx = -vx;
if (Math.abs(ry + vy) > 1.0 - radius) vy = -vy;
// update position
rx = rx + vx;
ry = ry + vy;
// clear the background
StdDraw.clear(StdDraw.GRAY);
// draw ball on the screen
StdDraw.setPenColor(StdDraw.BLACK);
StdDraw.filledCircle(rx, ry, radius);
// copy offscreen buffer to onscreen
StdDraw.show();
// pause for 20 ms
StdDraw.pause(20);
}
}
}
Copyright © 2000–2011, Robert Sedgewick and Kevin Wayne.
Last updated: Tue Aug 30 09:58:33 EDT 2016.
Classwork:
Add this program to your current project.
Make the following changes, submit a screenshot for each change and the final program:
- Comment out the “clear” function and describe what you see. Remove the comments to continue working.
- Make the ball color change when it bounces. Choose a random color at every bounce.
- Change the background color from the original.
- Change the shape of the ball.
Reminder:
