关于HTML5 Canvas旋转动画的2个例子

百变鹏仔 2个月前 (10-18) #H5教程

文章标签例子

这篇文章主要介绍了html5 canvas旋转动画的2个代码例子,实现了一个旋转的太极图效果,学习html5 canvas旋转动画的朋友可以参考下

效果图：

方法一：

<!DOCTYPE HTML>   <html>   <body>   <canvas id="myCanvas" width="500" height="500">your browser does not support the canvas tag</canvas>   <script type="text/javascript">   var deg = 0;   var r = 30;   var rl = 100;   function drawTaiji() {   var canvas = document.getElementById(&#39;myCanvas&#39;);   var context = canvas.getContext(&#39;2d&#39;);   var colorA = "rgb(0, 0, 0)";   var colorB = "red";   var px =Math.sin(deg)*r;   var py =Math.cos(deg)*r;   context.clearRect(0, 0, 300, 300);   context.beginPath();   context.fillStyle = colorA;   context.arc(rl, rl, 60, 0.5 * Math.PI +deg, 1.5 * Math.PI +deg, true);   context.closePath();   context.fill();   context.fillStyle = colorB;   context.beginPath();   context.arc(rl, rl, 60, 1.5* Math.PI +deg, 0.5 * Math.PI +deg, true);   context.closePath();   context.fill();   context.fillStyle = colorB;   context.beginPath();   context.arc(rl+px, rl-py, 30, 0.5 * Math.PI + deg, 1.5 * Math.PI + deg, true);   context.closePath();   context.fill();   context.fillStyle = colorA;   context.beginPath();   context.arc(rl-px, rl+py, 30, 1.5 * Math.PI + deg, 0.5 * Math.PI + deg, true);   context.closePath();   context.fill();   context.fillStyle = colorA;   context.beginPath();   context.arc(rl+px, rl-py, 8, 0, 2 * Math.PI, true);   context.closePath();   context.fill();   context.fillStyle = colorB;   context.beginPath();   context.arc(rl-px, rl+py, 8, 0, 2 * Math.PI, true);   context.closePath();   context.fill();   deg +=0.1;   }   setInterval(drawTaiji, 100);  </script> </p><p></body>   </html>

方法二：

<!DOCTYPE HTML>   <html>   <body>   <canvas id="myCanvas" width="500" height="500" >your browser does not support the canvas tag </canvas>   <script type="text/javascript">   var canvas = document.getElementById(&#39;myCanvas&#39;);   var ctx = canvas.getContext("2d");   var angle = 0;   var count = 360;   var clrA = &#39;#000&#39;;   var clrB = &#39;red&#39;;   function taiji(x, y, radius, angle, wise) {   angleangle = angle || 0;   wisewise = wise ? 1 : -1;   ctx.save();   ctx.translate(x, y);   ctx.rotate(angle);   ctx.fillStyle = clrA;   ctx.beginPath();   ctx.arc(0, 0, radius, 0, Math.PI, true);   ctx.fill();   ctx.beginPath();   ctx.fillStyle = clrB;   ctx.arc(0, 0, radius, 0, Math.PI, false);   ctx.fill();   ctx.fillStyle = clrB;   ctx.beginPath();   ctx.arc(wise * -0.5 * radius, 0, radius / 2, 0, Math.PI * 2, true);   ctx.fill();   ctx.beginPath();   ctx.fillStyle = clrA;   ctx.arc(wise * +0.5 * radius, 0, radius / 2, 0, Math.PI * 2, false);   ctx.arc(wise * -0.5 * radius, 0, radius / 10, 0, Math.PI * 2, true);   ctx.fill();   ctx.beginPath();   ctx.fillStyle = clrB;   ctx.arc(wise * +0.5 * radius, 0, radius / 10, 0, Math.PI * 2, true);   ctx.fill();   ctx.restore();   }   loop = setInterval(function () {   beginTag = true;   ctx.clearRect(0, 0, canvas.width, canvas.height);   taiji(200, 200, 50, Math.PI * (angle / count) * 2, true);   //taiji(350, 350, 50, Math.PI * ((count - angle) / count) * 2, false);   angle = (angle + 5) % count;   }, 50);   </script> </p><p></body>   </html>

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