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package com.jme3.effect.influencers;
import com.jme3.effect.Particle;
import com.jme3.effect.ParticleEmitter;
import com.jme3.effect.shapes.EmitterShape;
import com.jme3.export.Savable;
import com.jme3.math.Vector3f;
/**
* An interface that defines the methods to affect initial velocity of the particles.
* @author Marcin Roguski (Kaelthas)
*/
public interface ParticleInfluencer extends Savable, Cloneable {
/**
* This method influences the particle.
* @param particle
* particle to be influenced
* @param emitterShape
* the shape of it emitter
*/
void influenceParticle(Particle particle, EmitterShape emitterShape);
/**
* This method clones the influencer instance.
* @return cloned instance
*/
public ParticleInfluencer clone();
/**
* @param initialVelocity
* Set the initial velocity a particle is spawned with,
* the initial velocity given in the parameter will be varied according
* to the velocity variation set in {@link ParticleEmitter#setVelocityVariation(float) }.
* A particle will move toward its velocity unless it is effected by the
* gravity.
*/
void setInitialVelocity(Vector3f initialVelocity);
/**
* This method returns the initial velocity.
* @return the initial velocity
*/
Vector3f getInitialVelocity();
/**
* @param variation
* Set the variation by which the initial velocity
* of the particle is determined. <code>variation</code> should be a value
* from 0 to 1, where 0 means particles are to spawn with exactly
* the velocity given in {@link ParticleEmitter#setStartVel(com.jme3.math.Vector3f) },
* and 1 means particles are to spawn with a completely random velocity.
*/
void setVelocityVariation(float variation);
/**
* This method returns the velocity variation.
* @return the velocity variation
*/
float getVelocityVariation();
}
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