关于HTML5Canvas旋转动画的2个例子

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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('myCanvas'); 

 var context = canvas.getContext('2d'); 

 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('myCanvas'); 

 var ctx = canvas.getContext("2d"); 

 var angle = 0; 

 var count = 360; 

 var clrA = '#000'; 

 var clrB = 'red'; 

 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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关于HTML5Canvas旋转动画的2个例子