float t;
PShape curve;
void setup(){
  size(600,600);
  t = 0.0;
}

void draw(){
  background(0);

  curve = createShape();
  curve.beginShape();
  curve.fill(255);
  curve.noStroke();

  float theta = 0;
  while (theta < TWO_PI){
    float r = funct(theta, t);
    float x = r * cos(theta);
    float y = r * sin(theta);

    x = map(x,-2,2,0,width);
    y = map(y,-2,2,height,0);

    curve.vertex(x,y);
    theta += TWO_PI/200;
  }

  curve.endShape(CLOSE);
  shape(curve,0,0);

  t += 0.2/400;

  //saveFrame("./data/frame#####.tif");

  if (t > 0.2){
    //println("done capturing");
    //exit();
    t = 0;
  }
}

float funct(float theta, float t){
  return 1 + t * sin(7*theta);
}