class ParticleManager {

private Node guiNode;

private Spatial standardParticle, glowParticle;

private Node particleNode;

private Random rand;

public ParticleManager(Node guiNode, Spatial standardParticle, Spatial glowParticle) {

this.guiNode = guiNode;

this.standardParticle = standardParticle;

this.glowParticle = glowParticle;

particleNode = new Node("particles");

guiNode.attachChild(particleNode);

rand = new Random();

}

public void Gravity(Vector3f gravity, float distance) {

Vector3f additionalVelocity = gravity.mult(1000f / (distance*distance + 10000f));

velocity.addLocal(additionalVelocity);

if (distance < 400) {

additionalVelocity = new Vector3f(gravity.y, -gravity.x, 0).mult(3f / (distance + 100));

velocity.addLocal(additionalVelocity);

}

}

public void sprayParticle(Vector3f position, Vector3f sprayVel) {

Spatial particle = standardParticle.clone();

particle.setLocalTranslation(position);

ColorRGBA color = new ColorRGBA(0.8f,0.4f,0.8f,1f);

particle.addControl(new ParticleControl(sprayVel, 3500, color, screenWidth, screenHeight));

particle.setUserData("affectedByGravity", true);

((Node) guiNode.getChild("particles")).attachChild(particle);

}

public ColorRGBA hsvToColor(float h, float s, float v) {

if (h == 0 && s == 0) {

return new ColorRGBA(v, v, v,1);

}

float c = s * v;

float x = c * (1 - Math.abs(h % 2 - 1));

float m = v - c;

if (h < 1) {return new ColorRGBA(c + m, x + m, m, 1);

} else if (h < 2) {return new ColorRGBA(x + m, c + m, m, 1);

} else if (h < 3) {return new ColorRGBA(m, c + m, x + m, 1);

} else if (h < 4) {return new ColorRGBA(m, x + m, c + m, 1);

} else if (h < 5) {return new ColorRGBA(x + m, m, c + m, 1);

} else {return new ColorRGBA(c + m, m, x + m, 1);}

}

}