SVG 添加标记

带开始和结束标记的线段

<svg height="250" width="350" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <marker id="circle" markerWidth="8" markerHeight="8" refX="5" refY="5">
      <circle cx="5" cy="5" r="3" fill="black" />
    </marker>
    <marker id="arrow" markerWidth="10" markerHeight="10" refX="5" refY="5" orient="auto">
      <path d="M 0 0 L 10 5 L 0 10 z" fill="black" />
    </marker>
  </defs>
  <line x1="10" y1="10" x2="300" y2="200" stroke="red" stroke-width="3" marker-start="url(#circle)" marker-end="url(#arrow)" />
</svg>

带中间标记的多线段

<svg height="250" width="350" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <marker id="circle" markerWidth="8" markerHeight="8" refX="5" refY="5">
      <circle cx="5" cy="5" r="2" fill="black" />
    </marker>
    <marker id="arrow" markerWidth="10" markerHeight="10" refX="5" refY="5" orient="auto">
      <path d="M 0 0 L 10 5 L 0 10 z" fill="black" />
    </marker>
  </defs>
  <polyline points="15,40 15,170 200,170" stroke="red" stroke-width="3" fill="none" marker-start="url(#circle)" marker-mid="url(#circle)" marker-end="url(#arrow)" />
</svg>