<!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>