Android Open Source - libgdx-demo-pax-britannica Particle Emitter

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Back to project page libgdx-demo-pax-britannica.

License

The source code is released under:

Copyright (c) 2010 Ben Abraham, Renaud B?dard, Henk Boom, Daniel Burton, Matthew Gallant Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated ...

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Java Source Code

package de.swagner.paxbritannica.particlesystem;
//w  ww .j a  v  a2  s  .  c o  m
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.g2d.Batch;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.utils.Array;
import com.badlogic.gdx.utils.Pool;

public class ParticleEmitter extends Sprite {
  
  public int maxParticle = 500;
  
  protected Vector2 random = new Vector2();
  
  public float life = 1;
  float damping = 1;
  float delta_scale;
  Array<Particle> particles = new Array<Particle>(false,maxParticle);
  private Pool<Particle> freeParticles = new Pool<Particle>(maxParticle,maxParticle) {
    @Override
    protected Particle newObject() {
      return new Particle();
    }
  };

  float delta;

  @Override
  public void draw(Batch batch) {
    delta = Math.min(0.06f, Gdx.graphics.getDeltaTime());
    
    this.setOrigin(0,0);
    for (int i = particles.size - 1; i >= 0; i--) {
      Particle particle = particles.get(i);
      if (particle.life > 0) {
        updateParticle(particle);
        float dx = this.getWidth() / 2 * particle.scale;
        float dy = this.getHeight() / 2 * particle.scale;
        this.setColor(1, 1, 1, Math.max(particle.life / this.life,0));  
        this.setScale(particle.scale);
        this.setPosition(particle.position.x -dx, particle.position.y -dy);
        if(!(particle.position.y -dy>=-10 && particle.position.y -dy<=10) && !(particle.position.x -dx>=-10 && particle.position.x -dx<=10)) {
          super.draw(batch);
        } else {
          particle.life = 0;
        }
      } else {
        particles.removeIndex(i);
        freeParticles.free(particle);
      }
    }
    
  }

  private void updateParticle(Particle particle) {
    delta = Math.min(0.06f, Gdx.graphics.getDeltaTime());
    
    if (particle.life > 0) {
      particle.life -= delta;
      particle.position.add(particle.velocity.x * delta*10,particle.velocity.y * delta*10);
      particle.velocity.scl((float) Math.pow(damping, delta));
      particle.scale += this.delta_scale * delta/5f;
    }
  }
  
  public void addParticle(Vector2 position, Vector2 velocity, float life, float scale) {
       if(particles.size>maxParticle) return;
       if(Gdx.graphics.getFramesPerSecond()<25 && !(this instanceof ExplosionParticleEmitter)) return;
     Particle particle = freeParticles.obtain();
       particle.setup(position,velocity,life,scale);
       particles.add(particle);
  }
  
  public void dispose() {
    particles.clear();
    freeParticles.clear();
  }

}

Java Source Code List