/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.extension.effect.particle;
import java.io.IOException;
import java.util.ArrayList;
import com.ardor3d.math.MathUtils;
import com.ardor3d.math.Vector3;
import com.ardor3d.util.export.InputCapsule;
import com.ardor3d.util.export.OutputCapsule;
public class WanderInfluence extends ParticleInfluence {
public static final double DEFAULT_RADIUS = .03f;
public static final double DEFAULT_DISTANCE = .2f;
public static final double DEFAULT_JITTER = .005f;
private double _wanderRadius = DEFAULT_RADIUS;
private double _wanderDistance = DEFAULT_DISTANCE;
private double _wanderJitter = DEFAULT_JITTER;
private ArrayList<Vector3> _wanderTargets = new ArrayList<Vector3>(1);
private final Vector3 _workVect = new Vector3();
@Override
public void prepare(final ParticleSystem system) {
if (_wanderTargets.size() != system.getNumParticles()) {
_wanderTargets = new ArrayList<Vector3>(system.getNumParticles());
for (int x = system.getNumParticles(); --x >= 0;) {
_wanderTargets.add(new Vector3(system.getEmissionDirection()).normalizeLocal());
}
}
}
@Override
public void apply(final double dt, final Particle particle, final int index) {
if (_wanderRadius == 0 && _wanderDistance == 0 && _wanderJitter == 0) {
return;
}
final Vector3 wanderTarget = _wanderTargets.get(index);
wanderTarget.addLocal(calcNewJitter(), calcNewJitter(), calcNewJitter());
wanderTarget.normalizeLocal();
wanderTarget.multiplyLocal(_wanderRadius);
_workVect.set(particle.getVelocity()).normalizeLocal().multiplyLocal(_wanderDistance);
_workVect.addLocal(wanderTarget).normalizeLocal();
_workVect.multiplyLocal(particle.getVelocity().length());
particle.getVelocity().set(_workVect);
}
private double calcNewJitter() {
return ((MathUtils.nextRandomFloat() * 2.0f) - 1.0f) * _wanderJitter;
}
public double getWanderDistance() {
return _wanderDistance;
}
public void setWanderDistance(final double wanderDistance) {
_wanderDistance = wanderDistance;
}
public double getWanderJitter() {
return _wanderJitter;
}
public void setWanderJitter(final double wanderJitter) {
_wanderJitter = wanderJitter;
}
public double getWanderRadius() {
return _wanderRadius;
}
public void setWanderRadius(final double wanderRadius) {
_wanderRadius = wanderRadius;
}
@Override
public void write(final OutputCapsule capsule) throws IOException {
super.write(capsule);
final OutputCapsule cap = capsule;
cap.write(_wanderRadius, "wanderRadius", DEFAULT_RADIUS);
cap.write(_wanderDistance, "wanderDistance", DEFAULT_DISTANCE);
cap.write(_wanderJitter, "wanderJitter", DEFAULT_JITTER);
}
@Override
public void read(final InputCapsule capsule) throws IOException {
super.read(capsule);
final InputCapsule cap = capsule;
_wanderRadius = cap.readDouble("wanderRadius", DEFAULT_RADIUS);
_wanderDistance = cap.readDouble("wanderDistance", DEFAULT_DISTANCE);
_wanderJitter = cap.readDouble("wanderJitter", DEFAULT_JITTER);
}
@Override
public Class<? extends WanderInfluence> getClassTag() {
return getClass();
}
}