stroke-linejoin - SVG: Scalable Vector Graphics 编辑

The stroke-linejoin attribute is a presentation attribute defining the shape to be used at the corners of paths when they are stroked.

Note: As a presentation attribute stroke-linejoin 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 nine elements: <altGlyph>, <path>, <polygon>, <polyline>, <rect>, <text>, <textPath>, <tref>, and <tspan>

html,body,svg { height:100% }

<svg viewBox="0 0 18 12" xmlns="http://www.w3.org/2000/svg">
  <!--
  Upper left path:
  Effect of the "miter" value
  -->
  <path d="M1,5 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3.5" stroke="black" fill="none"
        stroke-linejoin="miter" />

  <!--
  Center path:
  Effect of the "round" value
  -->
  <path d="M7,5 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3.5" stroke="black" fill="none"
        stroke-linejoin="round" />

  <!--
  Upper right path:
  Effect of the "bevel" value
  -->
  <path d="M13,5 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3.5" stroke="black" fill="none"
        stroke-linejoin="bevel" />

  <!--
  Bottom left path:
  Effect of the "miter-clip" value
  with fallback to "miter" if not supported.
  -->
  <path d="M3,11 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3.5" stroke="black" fill="none"
        stroke-linejoin="miter-clip" />

  <!--
  Bottom right path:
  Effect of the "arcs" value
  with fallback to "miter" if not supported.
  -->
  <path d="M9,11 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3.5" stroke="black" fill="none"
        stroke-linejoin="arcs" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <g id="highlight">
    <path d="M1,5 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3.5"
          stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="1" cy="5"   r="0.05" fill="pink" />
    <circle cx="3" cy="2"   r="0.05" fill="pink" />
    <circle cx="5" cy="5.5" r="0.05" fill="pink" />
  </g>
  <use xlink:href="#highlight" x="6" />
  <use xlink:href="#highlight" x="12" />
  <use xlink:href="#highlight" x="2" y="6" />
  <use xlink:href="#highlight" x="8" y="6" />
</svg>

Usage context

Value	arcs | bevel |miter | miter-clip | round
Default value	miter
Animatable	discrete

arcs

Note: the arcs value as been introduced in SVG2 and it isn't widely supported yet, see Browser compatibility bellow for details.

The arcs value indicates that an arcs corner is to be used to join path segments. The arcs shape is formed by extending the outer edges of the stroke at the join point with arcs that have the same curvature as the outer edges at the join point.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 6 6" xmlns="http://www.w3.org/2000/svg">
  <!-- Effect of the "arcs" value -->
  <path d="M1,5 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3" stroke="black" fill="none"
        stroke-linejoin="arcs" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <g id="p">
    <path d="M1,5 a2,2 0,0,0 2,-3 a3,3 0 0 1 2,3"
          stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="1" cy="5" r="0.05" fill="pink" />
    <circle cx="3" cy="2" r="0.05" fill="pink" />
    <circle cx="5" cy="5" r="0.05" fill="pink" />
  </g>
</svg>

bevel

The bevel value indicates that a bevelled corner is to be used to join path segments.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 6 6" xmlns="http://www.w3.org/2000/svg">
  <!-- Effect of the "bevel" value -->
  <path d="M1,5 l2,-3 l2,3" stroke="black" fill="none"
        stroke-linejoin="bevel" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <g id="p">
    <path d="M1,5 l2,-3 l2,3"
          stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="1" cy="5" r="0.05" fill="pink" />
    <circle cx="3" cy="2" r="0.05" fill="pink" />
    <circle cx="5" cy="5" r="0.05" fill="pink" />
  </g>
</svg>

miter

The miter value indicates that a sharp corner is to be used to join path segments. The corner is formed by extending the outer edges of the stroke at the tangents of the path segments until they intersect.

Note: If the stroke-miterlimit is exceeded, the line join falls back to bevel.

Example

html,body,svg { height:100% }

<svg viewBox="0 -1 10 7" xmlns="http://www.w3.org/2000/svg">
  <!-- Effect of the "miter" value -->
  <path d="M1,5 l2,-3 l2,3" stroke="black" fill="none"
        stroke-linejoin="miter" />

  <!-- Effect of the "miter" value on a sharp angle
       where de default miter limit is exceeded -->
  <path d="M7,5 l0.75,-3 l0.75,3" stroke="black" fill="none"
        stroke-linejoin="miter" />

  <!-- the following red dotted line show where
       the miter value falls back to the bevel value -->
  <path d="M0,0 h10" stroke="red" stroke-dasharray="0.05"  stroke-width="0.025"/>

  <!-- the following pink lines highlight the position of the path for each stroke -->
  <g>
    <path d="M1,5 l2,-3 l2,3" stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="1" cy="5" r="0.05" fill="pink" />
    <circle cx="3" cy="2" r="0.05" fill="pink" />
    <circle cx="5" cy="5" r="0.05" fill="pink" />

    <path d="M7,5 l0.75,-3 l0.75,3" stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="7"    cy="5" r="0.05" fill="pink" />
    <circle cx="7.75" cy="2" r="0.05" fill="pink" />
    <circle cx="8.5"  cy="5" r="0.05" fill="pink" />
  </g>
</svg>

miter-clip

Note: the miter-clip value as been introduced in SVG2 and it isn't widely supported yet, see Browser compatibility bellow for details.

The miter-clip value indicates that a sharp corner is to be used to join path segments. The corner is formed by extending the outer edges of the stroke at the tangents of the path segments until they intersect.

If the stroke-miterlimit is exceeded, the miter is clipped at a distance equal to half the stroke-miterlimit value multiplied by the stroke width from the intersection of the path segments. This provides a better rendering than miter on very sharp join or in case of an animation.

Example

html,body,svg { height:100% }

<svg viewBox="0 -1 10 7" xmlns="http://www.w3.org/2000/svg">
  <!-- Effect of the "miter-clip" value -->
  <path d="M1,5 l2,-3 l2,3" stroke="black" fill="none"
        stroke-linejoin="miter-clip" />

  <!-- Effect of the "miter-clip" value on a sharp angle
       where de default miter limit is exceeded -->
  <path d="M7,5 l0.75,-3 l0.75,3" stroke="black" fill="none"
        stroke-linejoin="miter-clip" />

  <!-- the following red dotted line show where the clip should happen -->
  <path d="M0,0 h10" stroke="red" stroke-dasharray="0.05"  stroke-width="0.025"/>

  <!-- the following pink lines highlight the position of the path for each stroke -->
  <g>
    <path d="M1,5 l2,-3 l2,3" stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="1" cy="5" r="0.05" fill="pink" />
    <circle cx="3" cy="2" r="0.05" fill="pink" />
    <circle cx="5" cy="5" r="0.05" fill="pink" />

    <path d="M7,5 l0.75,-3 l0.75,3" stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="7"    cy="5" r="0.05" fill="pink" />
    <circle cx="7.75" cy="2" r="0.05" fill="pink" />
    <circle cx="8.5"  cy="5" r="0.05" fill="pink" />
  </g>
</svg>

round

The round value indicates that a round corner is to be used to join path segments.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 6 6" xmlns="http://www.w3.org/2000/svg">
  <!-- Effect of the "round" value -->
  <path d="M1,5 l2,-3 l2,3" stroke="black" fill="none"
        stroke-linejoin="round" />

  <!--
  the following pink lines highlight the
  position of the path for each stroke
  -->
  <g id="p">
    <path d="M1,5 l2,-3 l2,3"
          stroke="pink" fill="none" stroke-width="0.025" />
    <circle cx="1" cy="5" r="0.05" fill="pink" />
    <circle cx="3" cy="2" r="0.05" fill="pink" />
    <circle cx="5" cy="5" r="0.05" fill="pink" />
  </g>
</svg>

Specifications

Specification	Status	Comment
Scalable Vector Graphics (SVG) 2 The definition of 'stroke-linejoin' in that specification.	Candidate Recommendation	Definition for shapes and texts
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'stroke-linejoin' in that specification.	Recommendation	Initial definition for shapes and texts

Browser compatibility

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