sincos

int num = 200, frms=180;
float angle, theta;
float d = 150;

void setup() {
  size(540, 540);
  noStroke();
}

void draw() {
  background(238);
  fill(34);
  translate(width/2, height/2);
  beginShape();
  for (int i=0; i<num; i++) {
    angle = TWO_PI/num*i;
    float offSet = PI/num*i;
    float sc = map(sin(theta+offSet*2), -1, 1, 0.5, 1);
    float x = sin(angle+offSet*3*sc)*d*sc;
    float y = cos(angle+offSet*sc)*d*sc;
    vertex(x, y);
  }
  endShape(CLOSE);

  theta += TWO_PI/frms;
  if (frameCount<frms) saveFrame("image-###.gif");
}