public void draw() { background(0); noStroke(); fill(255); if (physics.particles.size() < NUM_PARTICLES) { addParticle(); } physics.update(); for (Iterator<pma_ParticleVerlet> i = physics.particles.iterator(); i.hasNext(); ) { pma_ParticleVerlet p = i.next(); ellipse(p.x, p.y, 5, 5); } // text("fps: " + frameRate, 20, 20); }