stroke-linecap - SVG: Scalable Vector Graphics 编辑

The stroke-linecap attribute is a presentation attribute defining the shape to be used at the end of open subpaths when they are stroked.

Note: As a presentation attribute stroke-linecap can be used as a CSS property.

As a presentation attribute, it can be applied to any element but it has effect only on the following eight elements: <altGlyph>, <path>, <polyline>, <line>, <text>, <textPath>, <tref>, and <tspan>

html,body,svg { height:100% }

<svg viewBox="0 0 6 6" xmlns="http://www.w3.org/2000/svg">

  <!-- Effect of the (default) "butt" value -->
  <line x1="1" y1="1" x2="5" y2="1" stroke="black"
        stroke-linecap="butt" />

  <!-- Effect of the "round" value -->
  <line x1="1" y1="3" x2="5" y2="3" stroke="black"
        stroke-linecap="round" />

  <!-- Effect of the "square" value -->
  <line x1="1" y1="5" x2="5" y2="5" stroke="black"
        stroke-linecap="square" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <path d="M1,1 h4 M1,3 h4 M1,5 h4" stroke="pink" stroke-width="0.025" />
</svg>

Usage notes

butt

The butt value indicates that the stroke for each subpath does not extend beyond its two endpoints. On a zero length subpath, the path will not be rendered at all.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 6 4" xmlns="http://www.w3.org/2000/svg">

  <!-- Effect of the "butt" value -->
  <path d="M1,1 h4" stroke="black"
        stroke-linecap="butt" />

  <!-- Effect of the "butt" value on a zero length path -->
  <path d="M3,3 h0" stroke="black"
        stroke-linecap="butt" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <path d="M1,1 h4" stroke="pink" stroke-width="0.025" />
  <circle cx="1" cy="1" r="0.05" fill="pink" />
  <circle cx="5" cy="1" r="0.05" fill="pink" />
  <circle cx="3" cy="3" r="0.05" fill="pink" />
</svg>

round

The round value indicates that at the end of each subpath the stroke will be extended by a half circle with a diameter equal to the stroke width. On a zero length subpath, the stroke consists of a full circle centered at the subpath's point.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 6 4" xmlns="http://www.w3.org/2000/svg">

  <!-- Effect of the "round" value -->
  <path d="M1,1 h4" stroke="black"
        stroke-linecap="round" />

  <!-- Effect of the "round" value on a zero length path -->
  <path d="M3,3 h0" stroke="black"
        stroke-linecap="round" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <path d="M1,1 h4" stroke="pink" stroke-width="0.025" />
  <circle cx="1" cy="1" r="0.05" fill="pink" />
  <circle cx="5" cy="1" r="0.05" fill="pink" />
  <circle cx="3" cy="3" r="0.05" fill="pink" />
</svg>

square

The square value indicates that at the end of each subpath the stroke will be extended by a rectangle with a width equal to half the width of the stroke and a height equal to the width of the stroke. On a zero length subpath, the stroke consists of a square with its width equal to the stroke width, centered at the subpath's point.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 6 4" xmlns="http://www.w3.org/2000/svg">

  <!-- Effect of the "square" value -->
  <path d="M1,1 h4" stroke="black"
        stroke-linecap="square" />

  <!-- Effect of the "square" value on a zero length path -->
  <path d="M3,3 h0" stroke="black"
        stroke-linecap="square" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <path d="M1,1 h4" stroke="pink" stroke-width="0.025" />
  <circle cx="1" cy="1" r="0.05" fill="pink" />
  <circle cx="5" cy="1" r="0.05" fill="pink" />
  <circle cx="3" cy="3" r="0.05" fill="pink" />
</svg>

Browser compatibility

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Specifications