/*https://editor.p5js.org/p5/sketches/Form:_Regular_Polygon
 * @name Regular Polygon
 * @description What is your favorite? Pentagon? Hexagon? Heptagon? No?
 * What about the icosagon? The polygon() function created for this example is
 * capable of drawing any regular polygon. Try placing different numbers into
 * the polygon() function calls within draw() to explore.
 */
function setup() {
  createCanvas(720, 400);
}

function draw() {
  background(102);

  push();
  translate(width * 0.2, height * 0.5);
  rotate(frameCount / 200.0);
  polygon(0, 0, 82, 3);
  pop();

  push();
  translate(width * 0.5, height * 0.5);
  rotate(frameCount / 50.0);
  polygon(0, 0, 80, 20);
  pop();

  push();
  translate(width * 0.8, height * 0.5);
  rotate(frameCount / -100.0);
  polygon(0, 0, 70, 7);
  pop();
}

function polygon(x, y, radius, npoints) {
  let angle = TWO_PI / npoints;
  beginShape();
  for (let a = 0; a < TWO_PI; a += angle) {
    let sx = x + cos(a) * radius;
    let sy = y + sin(a) * radius;
    vertex(sx, sy);
  }
  endShape(CLOSE);
}