欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  web前端

关于HTML5 Canvas旋转动画的2个例子

程序员文章站 2022-04-13 20:41:29
...
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:
关于HTML5 Canvas旋转动画的2个例子

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>

以上就是本文的全部内容,希望对大家的学习有所帮助,更多相关内容请关注PHP中文网!

相关推荐:

如何使用HTML5 canvas实现雪花飘落

如何使用jQuery和HTML5实现手机摇一摇的换衣特效

以上就是关于HTML5 Canvas旋转动画的2个例子的详细内容,更多请关注其它相关文章!