/**
* Starts the effect.
*
* @param currentLevel the level the effect is taking place on
*/
public static void start(Level currentLevel) {
started = true;
CollisionEffect.currentLevel = currentLevel;
Point2d shift = currentLevel.getShift();
Ball ball = currentLevel.getBall();
Body intersected = currentLevel.getIntersectingBody();
particles = Particle.generateParticles(ball, intersected);
shakeValues = new double[6];
double speed = ball.getVelocity().magnitude();
if (speed < .25) speed = .25;
if (speed > 2.5) speed = 2.5;
double shakeFactor = 3 * speed / currentLevel.getFollowFactor();
if (currentLevel.getFollowFactor() == 0.0) shakeFactor = .25 * speed;
// 1st value is multiplicative factor
int sign1 = -1;
if (ball.getCenter().x() + shift.x() < 0) {
sign1 = 1;
} else if (ball.getCenter().x() + shift.x() > 0) {
sign1 = CalcHelp.randomSign();
}
shakeValues[0] = CalcHelp.randomDouble(35, 40) * shakeFactor * sign1;
int sign2 = -1;
if (ball.getCenter().y() + shift.y() < 0) {
sign2 = 1;
} else if (ball.getCenter().y() + shift.y() > 0) {
sign2 = CalcHelp.randomSign();
}
shakeValues[3] = CalcHelp.randomDouble(35, 40) * shakeFactor * sign2;
// 2nd value is sinusoidal factor
shakeValues[1] = CalcHelp.randomDouble(45, 50);
shakeValues[4] = CalcHelp.randomDouble(45, 50);
// 3rd value is exponential factor
shakeValues[2] = CalcHelp.randomDouble(-.0035, -.0045);
shakeValues[5] = CalcHelp.randomDouble(-.0035, -.0045);
startTime = System.currentTimeMillis();
ball.setLaunched(false);
}
private static long elapsedTime() {
return System.currentTimeMillis() - startTime;
}