点群の回転

/**
* cycle of points
*
* @author aa_debdeb
* @date 2016/05/07
*/

ArrayList<Particle> particles;

void setup(){
  size(640, 480, P3D);
  particles = new ArrayList<Particle>();
  for(int i = 0; i < 500; i++){
    particles.add(new Particle());
  }
  noStroke();
  fill(255, 255, 56);
  sphereDetail(8);
}

void draw(){
  background(25, 25, 112);
  translate(0, height / 2);
  for(Particle particle: particles){
    particle.update();
    particle.display();
  }
}

class Particle{
  
  float x;
  float radian;
  
  Particle(){
    x = random(-200, width + 200);
    radian = random(TWO_PI);
  }  
  
  void update(){
    radian += PI / 256;
  }
  
  void display(){
    pushMatrix();
    translate(x, height / 2.0 * sin(radian), height / 2.0 * cos(radian));
    sphere(10);
    popMatrix(); 
  }
  
}