/*************************************************************
* Name:
* NetID:
* Precept:
*
* Description: Object-oriented implementation of a 2-D
* bouncing ball.
*************************************************************/
public class Ball {
// declare instance variables
_____________________________________________ // position
_____________________________________________ // velocity
_____________________________________________ // radius
// other instance variables? up to you
// constructor
public Ball() {
// always start ball position at (0, 0)
// initial velocity and size generated randomly
}
// draw the ball, but not the background
public void draw() {
}
// bounce off vertical wall by reflecting x-velocity
private void bounceOffVerticalWall() {
}
// bounce off horizontal wall by reflecting y-velocity
private void bounceOffHorizontalWall() {
}
// move the ball one step, but don't draw it
public void move() {
// bounce off wall(s) if you are near the border
// update position using unit change in time
}
// test client to create and animate just 2 balls.
// this part is already complete.
public static void main(String[] args) {
// create and initialize two balls
Ball b1 = new Ball();
Ball b2 = new Ball();
StdOut.println(b1.toString());
StdOut.println(b1); // call to toString() implied!
// animate them
StdDraw.setXscale(-1.0, +1.0);
StdDraw.setYscale(-1.0, +1.0);
while (true) {
StdDraw.setPenColor(StdDraw.GRAY);
StdDraw.filledSquare(0.0, 0.0, 1.0);
StdDraw.setPenColor(StdDraw.BLACK);
b1.move();
b2.move();
b1.draw();
b2.draw();
StdDraw.show(20);
}
}
}