SVG 绘制路径

SVG d 属性中的字母说明

• M = moveto (move from one point to another point)
• L = lineto (create a line)
• H = horizontal lineto (create a horizontal line)
• V = vertical lineto (create a vertical line)
• C = curveto (create a curve)
• S = smooth curveto (create a smooth curve)
• Q = quadratic Bézier curve (create a quadratic Bézier curve)
• T = smooth quadratic Bézier curveto (create a smooth quadratic Bézier curve)
• A = elliptical Arc (create a elliptical arc)
• Z = closepath (close the path)

Note: All the commands above can also be expressed in lower case. Upper case means absolutely positioned, lower case means relatively positioned.

简单路径

<svg height="210" width="400" xmlns="http://www.w3.org/2000/svg">
  <path d="M150 5 L75 200 L225 200 Z"
  style="fill:none;stroke:green;stroke-width:3" />
</svg>

贝赛尔曲线

<svg height="400" width="450" xmlns="http://www.w3.org/2000/svg">

<!-- Draw the paths -->
<path id="lineAB" d="M 100 350 l 150 -300" stroke="red" stroke-width="4"/>
<path id="lineBC" d="M 250 50 l 150 300" stroke="red" stroke-width="4"/>
<path id="lineMID" d="M 175 200 l 150 0" stroke="green" stroke-width="4"/>
<path id="lineAC" d="M 100 350 q 150 -300 300 0" stroke="blue" stroke-width="4" fill="none"/>

<!-- Mark relevant points -->
<g stroke="black" stroke-width="3" fill="black">
<circle id="pointA" cx="100" cy="350" r="4" />
<circle id="pointB" cx="250" cy="50" r="4" />
<circle id="pointC" cx="400" cy="350" r="4" />
</g>

<!-- Label the points -->
<g font-size="30" font-family="sans-serif" fill="green" text-anchor="middle">
<text x="100" y="350" dx="-30">A</text>
<text x="250" y="50" dy="-10">B</text>
<text x="400" y="350" dx="30">C</text>
</g>

</svg>