关于HTML5 Canvas旋转动画的2个例子

互联网 18-6-22

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：

<!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HTML5 Canvas旋转动画的2个例子

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