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package com.jme3.effect.influencers;
import com.jme3.effect.Particle;
import com.jme3.effect.shapes.EmitterShape;
import com.jme3.export.InputCapsule;
import com.jme3.export.JmeExporter;
import com.jme3.export.JmeImporter;
import com.jme3.export.OutputCapsule;
import com.jme3.math.FastMath;
import com.jme3.math.Vector3f;
import java.io.IOException;
/**
* This emitter influences the particles so that they move all in the same direction.
* The direction may vary a little if the velocity variation is non zero.
* This influencer is default for the particle emitter.
* @author Marcin Roguski (Kaelthas)
*/
public class DefaultParticleInfluencer implements ParticleInfluencer {
/** Temporary variable used to help with calculations. */
protected transient Vector3f temp = new Vector3f();
/** The initial velocity of the particles. */
protected Vector3f startVelocity = new Vector3f();
/** The velocity's variation of the particles. */
protected float velocityVariation = 0.2f;
@Override
public void influenceParticle(Particle particle, EmitterShape emitterShape) {
emitterShape.getRandomPoint(particle.position);
this.applyVelocityVariation(particle);
}
/**
* This method applies the variation to the particle with already set velocity.
* @param particle
* the particle to be affected
*/
protected void applyVelocityVariation(Particle particle) {
particle.velocity.set(startVelocity);
temp.set(FastMath.nextRandomFloat(), FastMath.nextRandomFloat(), FastMath.nextRandomFloat());
temp.multLocal(2f);
temp.subtractLocal(1f, 1f, 1f);
temp.multLocal(startVelocity.length());
particle.velocity.interpolate(temp, velocityVariation);
}
@Override
public void write(JmeExporter ex) throws IOException {
OutputCapsule oc = ex.getCapsule(this);
oc.write(startVelocity, "startVelocity", Vector3f.ZERO);
oc.write(velocityVariation, "variation", 0.2f);
}
@Override
public void read(JmeImporter im) throws IOException {
InputCapsule ic = im.getCapsule(this);
startVelocity = (Vector3f) ic.readSavable("startVelocity", Vector3f.ZERO.clone());
velocityVariation = ic.readFloat("variation", 0.2f);
}
@Override
public ParticleInfluencer clone() {
try {
DefaultParticleInfluencer clone = (DefaultParticleInfluencer) super.clone();
clone.startVelocity = startVelocity.clone();
return clone;
} catch (CloneNotSupportedException e) {
throw new AssertionError();
}
}
@Override
public void setInitialVelocity(Vector3f initialVelocity) {
this.startVelocity.set(initialVelocity);
}
@Override
public Vector3f getInitialVelocity() {
return startVelocity;
}
@Override
public void setVelocityVariation(float variation) {
this.velocityVariation = variation;
}
@Override
public float getVelocityVariation() {
return velocityVariation;
}
}
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