puls

int amount = 40;
color s = #202020;
color f = #ffffff;
Thing[] things = new Thing[amount];

void setup() {
  size(500, 500);
  background(255);
  stroke(0);
  //f = s;
  float theta=0;
  for (int i=0; i<amount; i++) {
    float x = sin(theta);
    float y = cos(theta);
    PVector vOrg = new PVector(x, y);
    vOrg.normalize();
    int cat = amount%2;
    println(cat);
    things[i]= new Thing(vOrg, theta, cat);
    theta += TAU/amount;
  }
}


void draw() {
  background(255);
  for (int i=0; i<things.length; i++) {
    things[i].run(200);
  }
  fill(255);
  noStroke();
  ellipse(width/2, height/2, 20, 20);

  if (frameCount % 2 == 0 && frameCount < 241) saveFrame("image-####.gif");
}

class Thing {
  PVector vOrg, vDepl;
  int cat;
  float sz, x, y, theta, mg, mag;

  Thing(PVector _vOrg, float _theta, int _cat) {
    vOrg = _vOrg;
    vDepl = vOrg.get();
    cat = _cat;
    theta = _theta;
  }

  void run(int _mag) {
    mag = _mag;
    move();
    display(mag);
  }

  void move() {
    mg = map(sin(theta*5), -1, 1, mag-80, mag);
    sz = map(sin(theta*5), -1, 1, 10, 20);
    vOrg.setMag(mg);
    x = width/2 + vOrg.x;
    y = height/2 + vOrg.y;
    theta += 0.0523/2;
  }


  void display(float mag) {

    stroke(s);
    line(width/2, height/2, x, y);
    fill(f);
    ellipse(x, y, sz, sz);
  }
}