shell

float segmentCount, angleStep, radius;

void setup() {
  size(800, 800);
  colorMode(HSB, 360, 100, 100);
  stroke(350);
  strokeWeight(8);
}

void draw() {
  background(350);
  segmentCount = 10;
  angleStep=360/segmentCount;

  float div = 5;
  radius = width/div;

  beginShape(TRIANGLE_FAN);
  vertex(width/2, height/2);
  for (float angle=0;angle <=360*4; angle+=angleStep) {
    float vx = width/2 + cos(radians(angle))*radius;
    float vy = height/2 + sin(radians(angle))*radius;
    vertex(vx, vy);
    fill(angle%360, 100, 90,80);
    radius *=1.02;
  }
  endShape();

}