在Firefox中缓慢的HTML5绘图

Question

Try the code below that draws 10000 lines in chrome and in firefox. 尝试下面的代码在chrome和firefox中绘制10000条线。 In firefox it runs extremely slow (3-4 seconds), in chrome it runs much faster. 在firefox中，它运行非常慢（3-4秒），在chrome中，它运行快得多。 I am writing application that draw in animation thousands of lines in frame. 我正在编写在帧中绘制动画数千行的应用程序。 Does anybody know how to accelerate firefox? 有人知道如何加速Firefox吗？ (the hardware acceleration in firefox is swith on). （firefox中的硬件加速已启用）。

<!DOCTYPE html>
<body>
<html>
<canvas id="myCanvas"></canvas>
</html>
</body>
<script>
  var canvas=document.getElementById("myCanvas");
  var context=canvas.getContext("2d");
  canvas.width=1000;
  canvas.height=600
  context.strokeStyle="black";
  context.lineWidth=0.3;
  context.fillStyle="#8ED6FF";
  context.fillRect(0,0,1000,800);
  var N=10000;
for (var i=0;i<N;i++){
  context.moveTo(500,300);
  context.lineTo(500+200*Math.cos(6.28*i/N),300-200*Math.sin(6.28*i/N));
 }
context.stroke();
</script>

Answer 1

You can probably use a "beginPath" call at the beginning of each loop iteration: 您可能可以在每个循环迭代的开始使用“ beginPath”调用：

<!DOCTYPE html>
<html>
<body>
<canvas id="myCanvas"></canvas>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
    $(document).ready(function(){

  var canvas=document.getElementById("myCanvas");
  var context=canvas.getContext("2d");
  canvas.width=1000;
  canvas.height=600
  context.strokeStyle="black";
  context.lineWidth=0.3;
  context.fillStyle="#8ED6FF";
  context.fillRect(0,0,1000,800);
  var N=10000;
for (var i=0;i<N;i++){
  context.beginPath();
  context.moveTo(500,300);
  context.lineTo(500+200*Math.cos(6.28*i/N),300-200*Math.sin(6.28*i/N));
  context.stroke();
 }

    });
</script>

</body>
</html>

But I think that mainly you have revealed a bug in Firefox, because as you said, in other browsers is just OK. 但是我认为主要是您发现了Firefox中的错误，因为正如您所说，在其他浏览器中就可以了。

在Firefox中缓慢的HTML5绘图

问题描述

1 个解决方案

解决方案1
1 已采纳 2012-07-29 09:30:29

在Firefox中缓慢的HTML5绘图

问题描述

1 个解决方案

解决方案1 1 已采纳 2012-07-29 09:30:29

解决方案1
1 已采纳 2012-07-29 09:30:29