int frame;
Particle p[];

void setup() {
  size(300,300);
  ellipseMode(CENTER_DIAMETER);
  framerate(20);

  p=new Particle[10];
  // p.length == number of objects in array "p"
  for(int i=0; i<p.length; i++)
    p[i]=new Particle(i, (int)random(0,2));
}

void loop() {
  //  background(200);

  for(int i=0; i<p.length; i++) p[i].update();
}

class Particle {
  float x,y,angle,angleD,speed,radius;
  int type,ORGANIC=0,MECHANICAL=1;

  // constructor
  public Particle(float rad,int _type) {
    type=_type;

    angle=random(0,360);
    angleD=random(-3,3);
    speed=random(1,5);
    x=width/2;
    y=height/2;

    radius=rad;
  }

  void update() {
    if(type==ORGANIC) {
      x=x+cos(radians(angle))*speed;
      y=y+sin(radians(angle))*speed;
      angle=angle+angleD;

      angleD=angleD+random(-0.5,0.5);
      if(angleD<-5) angleD=-5;
      else if(angleD>5) angleD=5;

      frame++;
      if(frame%50==0) angleD=-angleD;

      //  speed=speed+0.1;
    }
    else if(type==MECHANICAL) {
      x=x+cos(radians(angle))*speed;
      y=y+sin(radians(angle))*speed;
    }

    if(x<0) x=width;
    else if(x>width) x=0;
    if(y<0) y=height;
    else if(y>height) y=0;

    ellipse(x,y, radius,radius);
  }
}