figure02-20.svg

SVG资料。这是一个SVG资料

<svg>
	<!-- Points -->
	<circle r="0" 
		fill="black" stroke="black"/>
	<circle cx="10" cy="10" r="3" 
		fill="black" stroke="black"/>
	<circle cx="30" cy="10" r="5" 
		fill="black" stroke="red" stroke-width="2"/>
	<circle cx="50" cy="10" r="7" 
		fill="black" stroke="red" stroke-width="2"/>
	<!-- Circles -->
	<circle cx="0" cy="50" r="20" 
		fill="orange" stroke="black" stroke-width="3" />
	<circle cx="70" cy="50" r="30" 
		fill="grey" stroke="black" stroke-width="3" />
	<circle cx="120" cy="50" r="40" 
		fill="grey" fill-opacity="0.5" stroke="black" stroke-width="3"/>
	<circle cx="200" cy="50" r="50" 
		fill="grey" fill-opacity="0.3" stroke="black" stroke-width="3"/>
</svg>