/examples/advanced/simpleParticles/ParticleSystem.java

 1package advanced.simpleParticles;
 2
 3import java.util.ArrayList;
 4
 5import javax.media.opengl.GL;
 6
 7import org.mt4j.util.math.Tools3D;
 8
 9
10import processing.core.PApplet;
11import processing.core.PGraphics;
12import processing.core.PVector;
13
14// A class to describe a group of Particles
15// An ArrayList is used to manage the list of Particles 
16
17public class ParticleSystem {
18
19	private ArrayList<Particle> particles;    // An arraylist for all the particles
20	private PVector origin;        // An origin point for where particles are born
21	private PApplet app;
22
23	public ParticleSystem(PApplet app, int num, PVector v) {
24		this.app = app;
25		particles = new ArrayList<Particle>();              // Initialize the arraylist
26		origin = v.get();                        // Store the origin point
27		for (int i = 0; i < num; i++) {
28			particles.add(new Particle(app, origin));    // Add "num" amount of particles to the arraylist
29		}
30	}
31
32	public void run(PGraphics g) {
33		GL gl = Tools3D.getGL(g);
34		gl.glDisable(GL.GL_DEPTH_TEST);
35//		gl.glDepthMask(false);//depth testing - makes depth buffer read-only
36//		gl.glBlendFunc(GL.GL_SRC_ALPHA,GL.GL_ONE);//define blending as alpha blending
37		gl.glBlendFunc(GL.GL_ONE,GL.GL_ONE);//define blending as alpha blending
38		
39		// Cycle through the ArrayList backwards b/c we are deleting
40		for (int i = particles.size()-1; i >= 0; i--) {
41			Particle p = (Particle) particles.get(i);
42			p.run(g);
43			if (p.isDead()) {
44				particles.remove(i);
45			}
46		}
47		
48		gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
49//		gl.glDepthMask(true);//depth testing - makes depth buffer read-only
50		gl.glEnable(GL.GL_DEPTH_TEST);
51	}
52
53	public void addParticle() {
54		particles.add(new Particle(app, origin));
55	}
56
57	public void addParticle(float x, float y) {
58		particles.add(new Particle(app, new PVector(x,y)));
59	}
60
61	public void addParticle(Particle p) {
62		particles.add(p);
63	}
64	
65	public void addParticle(Particle p, float x, float y){
66		p.loc.set(x,y,0);
67		particles.add(p);
68	}
69
70	// A method to test if the particle system still has particles
71	public boolean isDead() {
72		if (particles.isEmpty()) {
73			return true;
74		} else {
75			return false;
76		}
77	}
78
79}
80