public void animate(float[] pts, float[] deltas, int index, int limit) {
float newpt = pts[index] + deltas[index];
if (newpt <= 0) {
newpt = -newpt;
deltas[index] = (float) (Math.random() * 3.0 + 2.0);
} else if (newpt >= (float) limit) {
newpt = 2.0f * limit - newpt;
deltas[index] = -(float) (Math.random() * 3.0 + 2.0);
}
pts[index] = newpt;
}
public void start() {
Dimension size = getSize();
for (int i = 0; i < animpts.length; i += 2) {
animpts[i + 0] = (float) (Math.random() * size.width);
animpts[i + 1] = (float) (Math.random() * size.height);
deltas[i + 0] = (float) (Math.random() * 4.0 + 2.0);
deltas[i + 1] = (float) (Math.random() * 4.0 + 2.0);
if (animpts[i + 0] > size.width / 6.0f) {
deltas[i + 0] = -deltas[i + 0];
}
if (animpts[i + 1] > size.height / 6.0f) {
deltas[i + 1] = -deltas[i + 1];
}
}
anim = new Thread(this);
anim.setPriority(Thread.MIN_PRIORITY);
anim.start();
}