这可能吗?以下是我尝试过的,但它完全用黑色填充了圆圈。
<svg id='vizMenu' width="700" height="660">
<defs>
<filter id="dropshadow" height="130%">
<feGaussianBlur in="SourceAlpha" stdDeviation="2"/>
<feOffset dx="0.5" dy="0.8" result="offsetblur"/>
<feMerge>
<feMergeNode/>
<feMergeNode in="SourceGraphic"/>
</feMerge>
</filter>
</defs>
<circle id='top' filter="url(#dropshadow)" cx="180" cy="120" r="80" stroke="#2E2E2E" stroke-width="2" fill="url('images/word-cloud.png')"/>
<circle id='bottom' filter="url(#dropshadow)" cx="500" cy="300" r="80" stroke="#2E2E2E" stroke-width="2" fill="url('images/word-cloud.png')"/>
<circle id='extra' filter="url(#dropshadow)" cx="180" cy="560" r="80" stroke="#2E2E2E" stroke-width="2" fill="#ffffff"/>
</svg>