It can even be interactive

Interactivity is pretty straightforward from here

becomes a lot more challenging if you move off the Z=0 plane

Example 6

• mouseX, mouseY

PSystem ps;

Particle p1;

void setup() {
  size(500,500);
  ps = (PSystem)loadPlugin("PSystem");
  
  p1 = new Particle();
  p1.setPos(width / 2 - 10, height/2, 0);
  p1.fix();
  
  Particle p2 = new Particle();
  p2.setPos(width / 2 + 10, height/2, 0);
  
  ps.addParticle(p1);
  ps.addParticle(p2);
  
  ps.addSpring(p1, p2);
  
  ps.setGravity(0.5);

}

void loop() {
  background(#99CCCC);
  p1.setPos(mouseX, mouseY, 0);
  ps.draw();
}