首页>HTML5 Canvas旋转动画的2个代码例子(一个旋转的太极图效果)

HTML5 Canvas旋转动画的2个代码例子(一个旋转的太极图效果)

作者:xiaosong  日期:06-24

效果图:

方法一:

代码如下:

<!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:

代码如下:

<!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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