<!DOCTYPE html>
<html>
<!-- ahhh -->

<body style="margin:0;overflow: hidden;">
  <canvas id="myCanvas" width="10" height="10" style="display: block;box-sizing: border-box;">
    Your browser does not support the HTML5 canvas tag.</canvas>
  <script>
    let c = document.getElementById("myCanvas");
    let ctx = c.getContext("2d");
    ctx.canvas.width = window.innerWidth;
    ctx.canvas.height = window.innerHeight;

    let deg_per_sec = 30;
    let time = 120;
    let fps = 60;

    centerX = ctx.canvas.width / 2;
    centerY = ctx.canvas.height / 2;

    rotation = 0; //was = j = angle
    currentFrame = 0; //was = i


    function render() {
      if (currentFrame < time / (1 / fps)) {
        setTimeout(() => {
          render();
          render_clear();

          draw_floral(8, 200, rotation *0, centerX, centerY, "red");
          

        }, 1000 / fps);
        rotation += deg_per_sec / fps; // was = j = angle, now = rotation
        currentFrame += 1; // was = i
      }
    }

    render();

    function draw_floral(sides, radius, rotation, x, y, colour) {
      var rot = Math.round((sides - 2) * 180 / sides * 2)
      var piv = 360 / sides;
      var stt = 0.5 * Math.PI - rad(rot) + rad(rotation);
      var end = 0;

      for (let i = 1; i < sides + 1; i++) {
        end = stt + rad(rot);
        ctx.beginPath();
        ctx.arc(x + Math.cos(rad(90 + piv * i + rotation)) * radius, y + Math.sin(rad(90 + piv * i + rotation)) * radius, radius, stt, end, 0);
        ctx.strokeStyle = colour;
        ctx.lineWidth = 3;
        ctx.stroke();

        stt = end + -(rad(rot - piv)) //+rad(30);

      }
    }

    function rad(degrees) {
      var pi = Math.PI;
      return degrees * (pi / 180);
    }


    function render_clear() {
      ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
      ctx.fillStyle = "black";
      ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
    }

  </script>
</body>

</html>