Drawing stars / Processing で星形（5芒星）を描く

stars.pde

void setup() {
  size(500, 500);
  noStroke();
  fill(255, 255, 0);
  for (int i = 0; i < 10; i++) {
    star(random(width), random(height), 30);
  }
}

void star(float x, float y, float r) {
  pushMatrix();
  translate(x, y);
  scale(1, -1);
  rotate(HALF_PI);
  beginShape();
  for (int i = 0; i < 5; i++) {
    vertex(r * cos(4 * PI * i / 5), r * sin(4 * PI * i / 5));
  }
  endShape(CLOSE);
  popMatrix();
}