SVG的Transform使用：
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Title</title>
</head>
<body>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<g id="square">
<rect x="0" y="0" width="20" height="20" style="fill:none;stroke:black;stroke-width:2" />
</g>
<use xlink:href="#square" transform="translate(50,50)" />
<use xlink:href="#square" transform="scale(2)" />
<use xlink:href="#square" transform="scale(3,1.5)" />
</svg>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<!-- 可以使用g进行统一变换 -->
<g id="g1" transform="translate(3,5)" style="fill:none;stroke:black;" >
<line x1="10" y1="10" x2="30" y2="30" />
<circle cx="20" cy="20" r="10" />
</g>
<rect x="15" y="20" width="10" height="5" transform="scale(3)" style="fill:none;stroke:black;" />
</svg>
<div>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<rect x="10" y="10" height="15" width="20" transform="translate(30,20) scale(2)" style="fill:gray" />
</svg>
<!-- 把变换放到g中，是一样的格式 -->
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<g transform="translate(30,20)">
<g transform="scale(2)">
<rect x="10" y="10" height="15" width="20" style="fill:gray"></rect>
</g>
</g>
</svg>
</div>
<div>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<!-- 变换顺序不同会影响最后的变换结果 -->
<rect x="10" y="10" width="20" height="15" transform="translate(30,20) scale(2)" style="fill:gray"></rect>
<rect x="10" y="10" width="20" height="15" transform="scale(2) translate(30,20)" style="fill:black"></rect>
</svg>
</div>
<div>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<circle cx="50" cy="50" r="3" style="fill:black"></circle>
<g id="arrow" style="stroke:black">
<line x1="60" y1="50" x2="90" y2="50"></line>
<polygon points="90 50,85 45,85 55"></polygon>
</g>
<!-- rotate(angle, centerX, centerY)可以指定中心点旋转 -->
<use xlink:href="#arrow" transform='rotate(60,50,50)'/>
<use xlink:href="#arrow" transform='rotate(-90,50,50)'/>
<use xlink:href="#arrow" transform='rotate(-150,50,50)'/>
<polyline points="20 20,30 20,30 30" style="stroke:black;fill:none"></polyline>
<rect x=70 y=70 width=20 height=20 fill="grey" />
<rect x=70 y=70 width=20 height=20 fill="black" transform="rotate(45)" />
</svg>
</div>
<div>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg" >
<circle cx=50 cy=50 r=2 fill="black" />
<g id="box" style="stroke:black;fill:none">
<rect x=35 y=40 width=30 height=20></rect>
</g>
<!-- 围绕中心点缩放 translate(-cx(fac-1),-cy(fac-1)) scale(fac) style=stroke-width:1/fac -->
<use xlink:href="#box" transform="translate(-50,-50) scale(2)" style="stroke-width:0.5"/>
<use xlink:href="#box" transform="translate(-75,-75) scale(2.5)" style="stroke-width:0.4"/>
<use xlink:href="#box" transform="translate(-100,-100) scale(3)" style="stroke-width:0.33"/>
</svg>
</div>
<div>
<svg width="240px" height="240px" xmlns="http://www.w3.org/2000/svg">
<!-- 以0,0 为中心进行绘制，然后再进行整体移动 -->
<g transform="translate(50,50)" >
<circle cx=0 cy=0 r=2 fill="black" />
<rect id="box1" x=-15 y=-10 width=30 height=20 style="stroke:black;fill:none" />
<use xlink:href="#box1" transform="scale(2)" style="stroke-width:0.5" />
<use xlink:href="#box1" transform="scale(2.5)" style="stroke-width:0.4" />
<use xlink:href="#box1" transform="scale(3)" style="stroke-width:0.33" />
</g>
</svg>
</div>
</body>
</html>