Shulou(Shulou.com)06/03 Report--

This article shows you how to use html5 to draw circular polygonal patterns, the content is concise and easy to understand, it can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Let's take a look at the simplest effect:

The code is as follows:

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Var canvas = document.getElementById ('my'), ctx = canvas.getContext (' 2d'); setInterval (function () {ctx.clearRect (0J0400400); ctx.save (); ctx.translate (200200); var ci = 90, pi = Math.PI / ci, x1 = 100, y1 = 0, x2 = 0, y2 = 0, x3 = 0, y3 = 0; ctx.beginPath () For (var I = ci * 2; I > 0; iMui -) {ctx.rotate (pi); ctx.moveTo (x1Powery1); y2 = x1 * Math.sin (pi); x2 = x1 * Math.cos (pi); x3 = (x1-x2) / 2 + x2 + 10 + Math.random () * 20 Y3 = y2 / 2; ctx.lineTo (x3); ctx.lineTo (x2);} ctx.stroke (); ctx.restore ();}

On the basis of the above polygons, it is followed by:

The code is as follows:

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Var canvas = document.getElementById ('my'), ctx = canvas.getContext (' 2d'), r = 10; setInterval (function () {ctx.clearRect (0400400); ctx.save (); ctx.translate (200200); var grad = ctx.createRadialGradient); grad.addColorStop (0.2) Grad.addColorStop; grad.addColorStop; ctx.beginPath (); ctx.fillStyle = grad; ctx.arc; ctx.fill (); var ci = 90, pi = Math.PI / ci, x2 = 0, y2 = 0, x3 = 0, y3 = 0 X1 = 100; y1 = 0; ctx.beginPath (); for (var I = ci * 2; I > 0; Imura -) {ctx.rotate (pi); ctx.moveTo (rmaine 0); y2 = r * Math.sin (pi); x2 = r * Math.cos (pi) X3 = (r-x2) / 2 + x2 + 10 + Math.random () * 20; y3 = y2 / 2; ctx.lineTo (x3 ~ Y3); ctx.lineTo (x ~ 2 ~ ());} ctx.fill (); ctx.restore (); r

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