Drawing sunflowers with Processing

sunflower.pde

color petalColor = #FFC608;
color seedsColor = #2A1B12;
color stemColor = #6C7D36;
color backgroundColor = #89B4EA;

void setup() {
  size(1920, 1080);
  frameRate(5);
  background(backgroundColor);
}

void draw() {
  float smallerLength = min(width, height);
  drawSunflower(random(width), random(height), random(smallerLength / 10, smallerLength / 5));
}

void drawPetal(float r, float size) {
  rotate(r);
  bezier(
    0, 0,
    0 + size, 0 + size / 2,
    0 + size, 0 - size / 2,
    0, 0
  );
}

void drawSunflower(float x, float y, float size) {
  translate(x, y);

  stroke(0);

  fill(stemColor);
  float stemWidth = size / 5;
  rect(-stemWidth / 2, 0, stemWidth, height);

  fill(petalColor);
  float petalLength = size * 1.5;
  for (float i = 0; i < TWO_PI; i += TWO_PI / 16) {
    drawPetal(i, petalLength);
  }

  fill(seedsColor);
  float seedsRadius = size;
  ellipse(0, 0, seedsRadius, seedsRadius);

  resetMatrix();
}