/**
* Updates the effect.
*
* @param g The Graphics component the particles are being drawn with.
* @return the new screenX and screenY shift values
*/
public static int[] update() {
double screenXShift = currentLevel.getScreenXShift();
double screenYShift = currentLevel.getScreenYShift();
long elapsedTime = elapsedTime();
screenXShift +=
(shakeValues[0]
* Math.sin(elapsedTime / shakeValues[1])
* Math.exp(shakeValues[2] * elapsedTime));
screenYShift +=
(shakeValues[3]
* Math.sin(elapsedTime / shakeValues[4])
* Math.exp(shakeValues[5] * elapsedTime));
for (int i = 0; i < particles.size(); i++) {
Particle p = particles.get(i);
for (Body bod : currentLevel.getBodies()) {
if (bod.intersects(p)
|| bod.getCenter().distanceSquared(p.getCenter())
<= (bod.getRadius() * .5) * (bod.getRadius() * .5)
&& i != 0) {
particles.remove(i);
i--;
}
}
for (Blockage blockage : currentLevel.getBlockages()) {
if (blockage.intersects(p.getCenter()) && i != 0) {
particles.remove(i);
i--;
}
}
for (GoalPost gp : currentLevel.getGoalPosts()) {
if (p.intersects(gp) && i != 0) {
particles.remove(i);
i--;
}
}
p.setVelocity(p.getVelocity().multiply(0.99));
p.move();
}
xShift = (int) screenXShift;
yShift = (int) screenYShift;
return new int[] {xShift, yShift};
}
/** Internal routine for generating the List of particles on collision. */
public static ArrayList<Particle> generateParticles(Ball ball, Body body) {
double centerX = ball.getCenter().x();
double centerY = ball.getCenter().y();
double speed =
ball.getVelocity().magnitude() * ((body != null) ? (body.getRadius() / 100.0) : 1);
if (speed < .50) speed = .50;
if (speed > 2.50) speed = 2.50;
if (body != null) {
double max = Math.pow(body.getRadius() + ball.getRadius(), 2);
while (body.getCenter().distanceSquared(new Point2d(centerX, centerY)) < max) {
centerX -= ball.getVelocity().xComponent();
centerY -= ball.getVelocity().yComponent();
}
}
ArrayList<Particle> particles = new ArrayList<Particle>();
int num = (int) (300 * speed);
if (num < 150) num = 150;
else if (num > 400) num = 400;
for (int i = 0; i < num; i++) {
double angle = (Math.random() * 2 * Math.PI);
double xSpeed = 0.75 * (Math.random() * speed * Math.cos(angle));
double ySpeed = 0.75 * (Math.random() * speed * Math.sin(angle));
Color c;
double rand = Math.random();
if (body == null) c = CalcHelp.getShiftedColor(ball.getColor(), 100);
else if (rand < 0.3) c = CalcHelp.getShiftedColor(body.getColor(), 100);
else if (rand < 0.40) c = CalcHelp.getShiftedColor(new Color(230, 130, 70), 100);
else c = CalcHelp.getShiftedColor(ball.getColor(), 100);
Particle newParticle = new Particle(centerX, centerY, xSpeed, ySpeed, c);
particles.add(newParticle);
}
return particles;
}
