Spread.pde

ArrayList<Agent> agents = new ArrayList<Agent>();
float zoff = 0;
int maxAgent = 4000;

void setup(){
  //size(500, 500);
  fullScreen();
  colorMode(HSB, 360, 100, 100);
  background(360);
}

void keyPressed(){
  if(key=='r'){
    background(360);
    agents = new ArrayList<Agent>();
  }
}

void draw(){
  noStroke();
  for(int i = 0; i < 10; i++){
    agents.add(new Agent(zoff));
    if(agents.size() > maxAgent){
      agents.remove(0);
    }//sin(zoff)*50+50
    fill((zoff)%360+200, 100, 100, sin(zoff*10)*2+2);
    for(Agent agent : agents){
      agent.update();
      agent.show();
    }
    zoff += 0.001;
  }
}

class Agent{
  PVector pos = new PVector();
  float nScale = 1000;
  float zoff;
  
  Agent(float zoff){
    this.zoff = zoff;
    pos = new PVector(width/2, height/2);
  }
  
  void update(){
    //float angle = noise(pos.x/nScale, pos.y/nScale, zoff)*TWO_PI*4;
    float angle = (sin(noise(pos.x/nScale, pos.y/nScale, zoff/100)*TWO_PI*2+zoff)+1)/2*TWO_PI*4;
    pos.add(new PVector(cos(angle), sin(angle)));
    if(pos.x < 0 || pos.x > width || pos.y < 0 || pos.y > height){
      pos = new PVector(width/2, height/2);
    }
  }
  
  void show(){
    //pixels[(int)pos.y*width+(int)pos.x-1] = col;
    rect(pos.x, pos.y, 1, 1);//I want to use alpha
  }
}