转自:http://blog.csdn.net/jia20003/article/details/9185449
一:什么是SVG
SVG是1999由W3C发布的2D图形描述语言,纯基于XML格式的标记语言,SVG的
全称是可扩展的矢量图形跟传统的Raster方式的图形(JPG, PNG, GIF等)有很大的差
别。SVG是2D图形开发平台,包括两个部分,一个是基于XML语言的数据描述,另
外一部分是可编程的API,其关键特性支持图形,文本,梯度填充,画笔风格,图形
特效滤镜如高斯模糊,会在稍后的代码中演示。同时还支持各种鼠标事件与DOM部
分API。几乎所有的主流浏览器都支持SVG图形格式的现实与绘制,IE9+以上也开始
支持SVG,在低版本的IE中需要插件支持。
更多了解SVG访问这里:http://www.w3.org/Graphics/SVG/About.html
二:JavaScript中SVG API编程演示
创建与获取SVG对象
// create svg object
var mySvg = document.createElementNS("http://www.w3.org/2000/svg","svg");
mySvg.setAttribute("version","1.2");// IE9+ support SVG 1.1 version
mySvg.setAttribute("baseProfile","tiny");
container.appendChild(mySvg);
在SVG中创建一个矩形图形:
var c1 = document.createElementNS("http://www.w3.org/2000/svg","rect");
c1.setAttribute("x","20");
c1.setAttribute("y","20");
c1.setAttribute("width","150");
c1.setAttribute("height","150");
c1.setAttribute("fill","rgb(0,0,255)");
c1.setAttribute("stroke","rgb(0,0,0)");
c1.setAttribute("stroke-width","4");
mySvg.appendChild(c1);
在SVG中实现文本绘制:
// SVG draw text
var stext = document.createElementNS("http://www.w3.org/2000/svg","text");
stext.setAttribute("x","700");
stext.setAttribute("y","100");
stext.setAttribute("font-size","18px");
stext.setAttribute("fill","#FF0000");
var textString = document.createTextNode("Hello SVG");
stext.appendChild(textString);
mySvg.appendChild(stext);
在SVG对象上实现鼠标点击事件处理与MouseUp事件处理:
// mouse event handling
c1.addEventListener("click",changeColor,false);
c2.addEventListener("mouseup", changeColor,false);
通过SVG 图形滤镜实现高斯模糊:
- <div id="blur-image-demo">
- <div id="left" style="width:20%;"><img src="woniu.png" alt="Original image" width="325" height="471"></div>
- <div id="right" style="width:80%;">
- <svg xmlns="http://www.w3.org/2000/svg" version="1.1">
- <defs>
- <filter id="f1" x="0" y="0">
- <feGaussianBlur in="SourceGraphic" stdDeviation="5" />
- </filter>
- </defs>
- <image x="0" y="0" width="325" height="471" xlink:href="woniu.png" filter="url(#f1)"/>
- </svg>
- </div>
- </div>
运行效果:
源代码,可以copy直接运行
JavaScript部分
- window.onload = function() {
- // get DIV
- var container = document.getElementById("svgContainer");
- // create svg object
- var mySvg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
- mySvg.setAttribute("version", "1.2");// IE9+ support SVG 1.1 version
- mySvg.setAttribute("baseProfile", "tiny");
- container.appendChild(mySvg);
- // create svg shape - rectangle
- var c1 = document.createElementNS("http://www.w3.org/2000/svg", "rect");
- c1.setAttribute("x", "20");
- c1.setAttribute("y", "20");
- c1.setAttribute("width", "150");
- c1.setAttribute("height", "150");
- c1.setAttribute("fill", "rgb(0,0,255)");
- c1.setAttribute("stroke", "rgb(0,0,0)");
- c1.setAttribute("stroke-width", "4");
- mySvg.appendChild(c1);
- // create svg shape - circle
- var c2 = document.createElementNS("http://www.w3.org/2000/svg", "circle");
- c2.setAttribute("cx", "250");
- c2.setAttribute("cy", "100");
- c2.setAttribute("r", "60");
- c2.setAttribute("fill", "#996699");
- c2.setAttribute("stroke", "#AA99FF");
- c2.setAttribute("stroke-width", "7");
- mySvg.appendChild(c2);
- // create svg shape - ellipse
- var c3 = document.createElementNS("http://www.w3.org/2000/svg", "ellipse");
- c3.setAttribute("cx", "450");
- c3.setAttribute("cy", "100");
- c3.setAttribute("rx", "100");
- c3.setAttribute("ry", "50");
- c3.setAttribute("fill", "#FF0000");
- c3.setAttribute("stroke", "purple");
- c3.setAttribute("stroke-width", "3");
- mySvg.appendChild(c3);
- // create svg shape - draw lines
- for(var i=0; i<10; i++)
- {
- var sline = document.createElementNS("http://www.w3.org/2000/svg", "line");
- var x1 = 580 + i*10;
- console.log(x1);
- sline.setAttribute("x1", x1.toString());
- sline.setAttribute("y1", "10");
- sline.setAttribute("x2", x1.toString());
- sline.setAttribute("y2", "180");
- sline.setAttribute("stroke", "rgb(0,255,0)");
- sline.setAttribute("stroke-width", "2");
- mySvg.appendChild(sline);
- }
- // SVG draw text
- var stext = document.createElementNS("http://www.w3.org/2000/svg", "text");
- stext.setAttribute("x", "700");
- stext.setAttribute("y", "100");
- stext.setAttribute("font-size", "18px");
- stext.setAttribute("fill", "#FF0000");
- var textString = document.createTextNode("Hello SVG");
- stext.appendChild(textString);
- mySvg.appendChild(stext);
- // mouse event handling
- c1.addEventListener("click", changeColor, false);
- c2.addEventListener("mouseup", changeColor, false);
- };
- function changeColor(evt) {
- var target = evt.target;
- target.setAttributeNS(null, "fill", "green");
- }
HTML部分:
- <html>
- <head>
- <title>Gloomyfish SVG Demo</title>
- <style>
- #svgContainer {
- width:800px;
- height:200px;
- background-color:#EEEEEE;
- }
- #left { float: left;}
- #right { float: right;}
- </style>
- </head>
- <body>
- <div id="svgContainer"></div>
- <div id="blur-image-demo">
- <div id="left" style="width:20%;"><img src="woniu.png" alt="Original image" width="325" height="471"></div>
- <div id="right" style="width:80%;">
- <svg xmlns="http://www.w3.org/2000/svg" version="1.1">
- <defs>
- <filter id="f1" x="0" y="0">
- <feGaussianBlur in="SourceGraphic" stdDeviation="5" />
- </filter>
- </defs>
- <image x="0" y="0" width="325" height="471" xlink:href="woniu.png" filter="url(#f1)"/>
- </svg>
- </div>
- </div>
- </body>
- </html>
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