reset method
void
reset()
Implementation
void reset() {
final random = Random();
x = random.nextDouble() * screenSize.width;
y = random.nextDouble() * screenSize.height;
length = random.nextDouble() * 50 + 20;
speedX = random.nextDouble() * (isStrongWind ? 6 : 3) + 2;
opacity = random.nextDouble() * 0.3 + 0.2;
waveAmplitude = random.nextDouble() * 1;
}