org.j3d.geom.particle
Class MaxAgePointForceEmitter

java.lang.Object
  org.j3d.geom.particle.BaseEmitter
      org.j3d.geom.particle.MaxAgePointForceEmitter

All Implemented Interfaces:

ParticleInitializer

public class MaxAgePointForceEmitter
extends BaseEmitter

MaxAgePointEmitter checks the age of a Particle and reinitializes it by moving it to a point in space and clearing resultant force and velocity and setting a new randomized force on the Particle.

Version:

$Revision: 2.0 $

Author:

Daniel Selman

Field Summary

Fields inherited from class org.j3d.geom.particle.BaseEmitter

color, initialMass, lifetime, lifetimeVariation, particleCount, randomiser, speed, surfaceArea, variation

Constructor Summary

MaxAgePointForceEmitter(int maxTime, int maxParticleCount, float[] position, float[] color, float force, float variation)
Construct a new emitter instance for a point emitter that gives the particle a random force direction and strength.

Method Summary

boolean	initialize(Particle particle) Initialize a particle based on the rules defined by this initializer.
int	numParticlesToCreate(int timeDelta) The number of particles that should be created and initialised this frame.
void	setMaxParticleCount(int maxCount) Adjust the maximum number of particles that this initializer is going to work with.
void	setParticleLifetime(int time) Change the maximum lifetime of the particles.
void	setPosition(float x, float y, float z) Change the basic position that the particles are being generated from.

Methods inherited from class org.j3d.geom.particle.BaseEmitter

getColor, getLifetimeVariation, getMass, getMaxParticleCount, getParticleLifetime, getParticleVariation, getSpeed, getSurfaceArea, setColor, setLifetimeVariation, setMass, setParticleVariation, setSpeed, setSurfaceArea

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MaxAgePointForceEmitter

public MaxAgePointForceEmitter(int maxTime,
                               int maxParticleCount,
                               float[] position,
                               float[] color,
                               float force,
                               float variation)

Construct a new emitter instance for a point emitter that gives the particle a random force direction and strength. The number of particles to create each frame is driven from the maximum particle count divided by the average lifetime.

Parameters:

maxTime - The time length of the particles to exist in milliseconds

maxParticleCount - The maximum number of particles to manage

position - The emitting position in the local space

color - The initial color of particles (4 component)

variation - The amount of variance for the initial values

Method Detail

setMaxParticleCount

public void setMaxParticleCount(int maxCount)

Adjust the maximum number of particles that this initializer is going to work with. This should not normally be called by the end user. The particle system that this initializer is registered with will call this method when it's corresponding method is called.

Specified by:

setMaxParticleCount in interface ParticleInitializer

Overrides:

setMaxParticleCount in class BaseEmitter

Parameters:

maxCount - The new maximum particle count to use

setParticleLifetime

public void setParticleLifetime(int time)
                         throws java.lang.IllegalArgumentException

Change the maximum lifetime of the particles. The lifetime of particles is defined in milliseconds, and must be positive.

Specified by:

setParticleLifetime in interface ParticleInitializer

Overrides:

setParticleLifetime in class BaseEmitter

Parameters:

time - The new lifetime, in milliseconds

Throws:

java.lang.IllegalArgumentException - The lifetime is zero or negative

numParticlesToCreate

public int numParticlesToCreate(int timeDelta)

The number of particles that should be created and initialised this frame. This is called once per frame by the particle system manager. Sends all particles initialially and nothing after that.

Parameters:

timeDelta - The delta between the last frame and this one in milliseconds

Returns:

The number of particles to create

initialize

public boolean initialize(Particle particle)

Initialize a particle based on the rules defined by this initializer. The particle system may choose to re-initialise previously dead particles. The implementation should not care whether the particle was previously in existance or not.

Parameters:

particle - The particle instance to initialize

Returns:

true if the ParticleSytem should keep running

setPosition

public void setPosition(float x,
                        float y,
                        float z)

Change the basic position that the particles are being generated from.

Parameters:

x - The x component of the location

y - The y component of the location

z - The z component of the location