PerlinNoiseBlob.pde

// Perlin Noise Blob
// Polar to Cartesian Coordinates
// Daniel Shiffman
// Nature of Code, Spring 2014

float yoff = 0.0;

void setup() {
  size(640,360);
}

void draw() {
  background(255);
  fill(150);
  strokeWeight(2);
  stroke(0);
  beginShape();
  float xoff = 0;
  for (float a = 0; a < TWO_PI; a += 0.05) {
    float r = 100 + map(noise(xoff,yoff),0,1,-20,20);
    xoff += 0.3;
    float x = r*cos(a); 
    float y = r*sin(a);
    vertex(width/2+x,height/2+y);
  }
  endShape(CLOSE);
  yoff += 0.02;
}