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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