SVG画矩形、半圆、三角形

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<path name="三角形" fill="red" stroke="blue" d="M150 50 L130 130 L170 130  Z"/>
<rect name="矩形" fill="#FFFFFF" x="255" y="125"  stroke="#0FFFFF" stroke-width="3.0821" width="16.437" height="45"/>
<path d="M275,175 h-100 a100,100 0 1,0 100,-100 z" fill="red" stroke="blue" stroke-width="5"/>
<path d="M130 25  A 30 30 0 0 1 55 25" stroke="black" fill="green" stroke-width="2" fill-opacity="0.5"/>
<path name="三角形" fill="red" stroke="blue" d="M550 250 L570 325 L530 325  Z"/>
<rect name="矩形" fill="#FFFFFF" x="580" y="250"  stroke="#0FFFFF" stroke-width="3" width="16" height="75"/>
<path d="M630 325  A 50 50 0 0 1 530 325" stroke="black" fill="green" stroke-width="2" fill-opacity="0.5"/>

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下面这句话就是画半圆的

<path d="M630 325 A 50 50 0 0 1 530 325" stroke="black" fill="green" stroke-width="2" fill-opacity="0.5"/>

M630 325表示将点移动到此处；

A 表示画笔从当前的点绘制一段圆弧到点(x,y)

50 50是两个半轴长度

0 0 1表示控制旋转角度，等。详见博客http://blog.csdn.net/dusea/article/details/49492167

530 325表示终点坐标。

这里画个半圆，因此终点的y值一致。

注意控制50 50是两个半轴长度，如果超过了起点和终点之间的长度，就会画成一段弧形。