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在SVG中，如何填充部分重疊形狀，如example（不是用SVG繪製）？如果我從形狀中省略填充圖案，我還希望從其重疊的其他形狀中移除圖案。之後，更多形狀可能會重疊並重新繪製圖案。我從代碼生成這個SVG，並且對於每個形狀，我會在代碼中知道它是否應該添加或減去填充模式。SVG：重疊形狀的填充圖案
這是我的SVG到目前爲止。它繪製形狀，並定義填充圖案但不使用它。
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<marker id="startArrowGreen" viewBox="0 0 10 10" refX="1" refY="5" markerUnits="strokeWidth" orient="auto" markerWidth="5" markerHeight="4">
<polyline points="10,0 0,5 10,10 9,5" fill="#00CC00" stroke="#00CC00"/>
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<marker id="endArrowBlue" viewBox="0 0 10 10" refX="1" refY="5" markerUnits="strokeWidth" orient="auto" markerWidth="5" markerHeight="4">
<polyline points="0,0 10,5 0,10 1,5" fill="#0000CC" stroke="#0000CC"/>
</marker>
<marker id="startArrowBlue" viewBox="0 0 10 10" refX="1" refY="5" markerUnits="strokeWidth" orient="auto" markerWidth="5" markerHeight="4">
<polyline points="10,0 0,5 10,10 9,5" fill="#0000CC" stroke="#0000CC"/>
</marker>
<pattern id="Crosshatch" patternUnits="userSpaceOnUse"
x="0" y="0" width="10" height="10"
viewBox="0 0 10 10" >
<path d="M 0 10 L 10 0" stroke-width="1" stroke="blue" />
</pattern>
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<circle cx="262.395" cy="238.913" r="100" stroke-width="1" stroke="#0000CC" fill="none"/>
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</svg>