<svg width="206pt" height="44pt"
viewBox="0.00 0.00 206.00 44.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 40)">
<title>%0</title>
<polygon fill="#ffffff" stroke="transparent" points="-4,4 -4,-40 202,-40 202,4 -4,4"/>
<!-- a -->
<g id="node1" class="node">
<title>a</title>
<ellipse fill="none" stroke="#000000" cx="27" cy="-18" rx="27" ry="18"/>
<text text-anchor="middle" x="27" y="-13.8" font-family="Times,serif" font-size="14.00" fill="#000000">a</text>
</g>
<!-- b -->
<g id="node2" class="node">
<title>b</title>
<ellipse fill="none" stroke="#000000" cx="99" cy="-18" rx="27" ry="18"/>
<text text-anchor="middle" x="99" y="-13.8" font-family="Times,serif" font-size="14.00" fill="#000000">b</text>
</g>
<!-- c -->
<g id="node3" class="node">
<title>c</title>
<ellipse fill="none" stroke="#000000" cx="171" cy="-18" rx="27" ry="18"/>
<text text-anchor="middle" x="171" y="-13.8" font-family="Times,serif" font-size="14.00" fill="#000000">c</text>
</g>
</g>
</svg>
以上就是一个svg矢量图片的代码. 复制并存为html或者svg. 用浏览器打开可以查看.