HTML5之canvas 9绘制图片
Posted 李大白
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绘制图片
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);
图片平铺
Var pat= context.createPattern(image,”repeat”);
Context.fillStyle=pat;
Context.fillRect(0,0,400,300);
图片裁剪
先绘制好路径
Context.clip();
绘制图片代码
<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>
图片平铺代码
1 <!DOCTYPE html> 2 <html> 3 4 <head> 5 <meta charset="UTF-8"> 6 <title>图片平铺</title> 7 <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" /> 8 9 </head> 10 11 <body> 12 <canvas id="canvas" width="500" height="500"></canvas> 13 <script type="text/javascript"> 14 var oCanvas = document.getElementById("canvas"); 15 var context = oCanvas.getContext("2d"); 16 context.fillStyle = "#ededed"; 17 context.fillRect(0, 0, 500, 500); 18 //平铺 19 20 var img = new Image(); //创建 21 img.src = "01.jpg"; //图片地址 22 img.onload = function() { 23 var pat = context.createPattern(img, "repeat"); 24 context.fillStyle = pat; 25 context.fillRect(0, 0, 500, 500); 26 } 27 </script> 28 </body> 29 30 </html>
图片裁剪代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>图片裁剪</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);
var img = new Image(); //创建
img.src = "04.jpg"; //图片地址
img.onload = function() { //检测所有图像信息载入页面里
// context.arc(100,100,60,0,2*Math.PI); //画圆
context.fillRect(100,100,40,40);
context.strokeRect(100,100,40,40);
context.clip();//裁
context.drawImage(img,40,40);//
};
</script>
</body>
</html>
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