ParticleEmitter.java

package elec0.particleEngine;

import java.util.ArrayList;
import java.util.List;

import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;

import elec0.particleEngine.Particle;
import elec0.utils.Timing;
import elec0.utils.Vector3f;

public class ParticleEmitter
{
    // Privates
    private float CONST_GRAVITY = 0.005f;
    private Vector3f startPosition;
    private float particleCount;
    private Color startColor;
    private List<Particle> particleList = new ArrayList<Particle>();
    private String particleBehavior;

    //Publics
    public String textureStyle;
    public Texture particleTexture; // This is set from ParticleEngine when it

    // ParticleEmitter constructor start
    ParticleEmitter(float particleCount, Vector3f position, Color color)
    {
        this.particleCount = particleCount;
        this.startPosition = position;
        this.startColor = color;
        for(int i = 0; i < this.particleCount; ++i)
        {
            particleList.add(new Particle(startPosition, startColor));
        }
    }
    ParticleEmitter(float particleCount, Vector3f position, Color color, String textureStyle)
    {
        this.particleCount = particleCount;
        this.startPosition = position;
        this.startColor = color;
        this.textureStyle = textureStyle;
        for(int i = 0; i < this.particleCount; ++i)
        {
            particleList.add(new Particle(startPosition, startColor));
        }
    }
    ParticleEmitter(float particleCount, Vector3f position, Color color, String textureStyle, String particleBehavior)
    {
        this.particleCount = particleCount;
        startPosition = position;
        startColor = color;
        this.textureStyle = textureStyle;
        this.particleBehavior = particleBehavior;

        for(int i = 0; i < this.particleCount; ++i)
        {
            particleList.add(new Particle(startPosition, startColor, particleBehavior));

        }
    }
    // ParticleEmitter constructor end


    public void draw()
    {
        particleTexture.bind();

        for(Particle p : particleList)
            p.draw();
    }

    public void update()
    {
        List<Particle> newList = new ArrayList<Particle>();

        for(Particle p : particleList)
        {

            p.moveVector = new Vector3f(0.00001f, 0.00001f, 0.00001f);
//          p.moveVector.addToY(-CONST_GRAVITY);
            float start = startPosition.getY();
            p.position.addTo(p.moveVector);

            float end = startPosition.getY();
            if(start != end)
                System.out.println("hit");
            // Check to see if particle's dead yet
            if(Timing.getTime() > (p.birthTime + p.lifetime))
            {

                // It's dead, reset it.
                newList.add(new Particle(startPosition, startColor, p.behavior));

            }
            else
            {

                // If it's not dead, put it in the new list
                newList.add(p);

            }

        }

        particleList = newList; // So we can edit things while iterating over the list

    }
}