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2 examples of HTML5 Canvas rotation animation

不言Original: 2018-06-22 15:07:592145browse

This article mainly introduces two code examples of HTML5 Canvas rotation animation, which implements a rotating Tai Chi effect. Friends who learn HTML5 Canvas rotation animation can refer to the following

Effect diagram:
2 examples of HTML5 Canvas rotation animation

Method 1:

<!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(&#39;myCanvas&#39;); 

  var context = canvas.getContext(&#39;2d&#39;); 

  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>

Method 2:

<!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(&#39;myCanvas&#39;); 

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

  var angle = 0; 

  var count = 360; 

  var clrA = &#39;#000&#39;; 

  var clrB = &#39;red&#39;; 

  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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