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Detailed explanation of image drawing examples in HTML5 canvas 9

高洛峰
高洛峰Original
2017-01-11 17:00:171804browse

Draw an image

Var image=new Image();

image.src=” http://img4.duitang.com/uploads/item/201406/25/20140625182321_4MTau. thumb.700_0.jpeg”;

image.onload=function(){}

Context.drawImage(image,x,y);

Context.drawImage(image ,x,y,w,h);

Context.drawIamge(image,sx,sy,sw,sh,dx,dy,dw,dh);

Picture tiling

HTML5 canvas 9绘制图片实例详解

Var pat= context.createPattern(image,”repeat”);

Context.fillStyle=pat;

Context.fillRect(0 ,0,400,300);

Picture cropping

HTML5 canvas 9绘制图片实例详解

Draw the path first

Context.clip();

<html>
 
 <head>
 <meta charset="UTF-8">
 <title>绘制图片</title>
 <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
 
 </head>
 
 <body>
 <canvas id="canvas" width="500" height="500"></canvas>
  
 <script type="text/javascript">
  var oCanvas = document.getElementById("canvas");
  var context = oCanvas.getContext("2d");
  context.fillStyle = "#ededed";
  context.fillRect(0, 0, 500, 500);
 
  //绘制图片
  var img = new Image(); //创建
  img.src = "img/01.jpg"; //图片地址
  img.onload = function() { //检测所有图像信息载入页面里
  context.drawImage(img, 0, 0); // img对象;0,0:img坐标起点
  };
 </script>
 </body>
 
</html>

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