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package tesseract.objects.emitters;
import java.util.LinkedList;
import java.util.List;
import javax.vecmath.Color3f;
import javax.vecmath.Vector3f;
import tesseract.objects.Particle;
import tesseract.objects.PhysicalObject;
/**
* ParticleEmitter Class.
*
* @author Jesse Morgan
*/
public class ParticleEmitter extends PhysicalObject {
/**
* Frequency of new objects.
*/
private float myFrequency;
/**
* The object to create...
*/
private Color3f myColor;
/**
* Counter to keep track of how long has passed.
*/
private float myCount;
/**
* Construct a new Particle Emitter.
*
* @param position Where to put the emitter
* @param frequency How often to emit the object (seconds).
* @param color Color the particle be (null for random).
*/
public ParticleEmitter(final Vector3f position, final float frequency,
final Color3f color) {
super(position);
myCount = 0;
myFrequency = frequency;
myColor = color;
}
/**
* Update State and maybe generate a new object.
*
* @param duration The length of time that has passed.
* @return A list of new objects to add to the world.
*/
public List<PhysicalObject> updateState(final float duration) {
List<PhysicalObject> children = super.updateState(duration);
if (children == null) {
children = new LinkedList<PhysicalObject>();
}
myCount += duration;
if (myCount >= myFrequency) {
children.add(new Particle(getPosition(), myColor));
myCount = 0;
}
return children;
}
}
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