public void setup() {
size(1024, 640, OPENGL);
frameRate(999);
gfx = new vgu_e_ToxiclibsSupport(this);
physics = new pma_PhysicsVerlet();
physics.setDrag(0.1f);
physics.setWorldBounds(new ga_Rectangle(0, 0, width, height));
physics.addBehavior(new pma_BehaviorForceGravity(new ga_Vector2(0, 0.15f)));
physics.setIndex(
new gb_SpatialBins<ga_Vector2>(
0,
width,
80,
new ga_i_CoordinateExtractor<ga_Vector2>() {
public final float coordinate(ga_Vector2 p) {
return p.x;
}
}));
textFont(createFont("SansSerif", 10));
}
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);
}
public void mouseReleased() {
physics.removeBehavior(mouseAttractor);
}
public void mousePressed() {
mousePos = new ga_Vector2(mouseX, mouseY);
mouseAttractor = new pma_BehaviorAttraction(mousePos, 400, 1.2f);
physics.addBehavior(mouseAttractor);
}
private void addParticle() {
pma_ParticleVerlet p = new pma_ParticleVerlet(ga_Vector2.random().mul(5).add(width * 0.5f, 0));
physics.addParticle(p);
// add a negative attraction force field around the new particle
physics.addBehavior(new pma_BehaviorAttraction(p, 20, -1.2f, 0.01f));
}