canvas實現的鋸齒效果程式碼例項

admin發表於2017-02-11
Canvas

本章節分享一段程式碼例項，它實現了邊框內部鋸齒效果，有興趣的朋友可以做一下自行分析。

程式碼如下:

[HTML] 純文字檢視 複製程式碼
<!DOCTYPE html>   
<html>   
<head>   
<meta charset=" utf-8">   
<meta name="author" content="http://www.softwhy.com/" />   
<title>螞蟻部落</title>  
<script type="text/javascript">
window.addEventListener("load",eventWindowLoaded, false);
function eventWindowLoaded(){
  var x,y;
  var theCanvas = document.getElementById("canvas");
  var context = theCanvas.getContext("2d");
  context.strokeStyle = '#00f'; 
  context.lineWidth=10;
  context.strokeRect(0, 0, theCanvas.width-0, theCanvas.height-0);
  context.fillStyle = "#00f";
  for(x=5;x<=canvas.width;x=x+10){
    context.beginPath();
    context.arc(x,5,5,0,Math.PI,false);
    context.closePath();
    context.fill();
    context.beginPath();
    context.arc(x,canvas.height-5,5,0,Math.PI,true);
    context.closePath();
    context.fill();
  }
  for(y=5;y<=canvas.height;y=y+10){
    context.beginPath();
    context.arc(5,y,5,0,Math.PI*2,true);
    context.arc(canvas.width-5,y,5,0,Math.PI*2,true);
    context.closePath();
    context.fill();
  }
}
</script>
</head>
<body>
<div style="position: absolute; top: 100px; left: 100px;">
<canvas id="canvas" width="300" height="300">瀏覽器不支援</canvas>
</div>
</body>
</html>

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