y1 - SVG: Scalable Vector Graphics 编辑

The y1 attribute is used to specify the first y-coordinate for drawing an SVG element that requires more than one coordinate. Elements that only need one coordinate use the y attribute instead.

Two elements are using this attribute: <line>, and <linearGradient>

html,body,svg { height:100% }

<svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
  <line x1="1" x2="9" y1="1" y2="5" stroke="red" />
  <line x1="1" x2="9" y1="5" y2="5" stroke="green" />
  <line x1="1" x2="9" y1="9" y2="5" stroke="blue" />
</svg>

line

For <line>, y1 defines the y coordinate of the starting point of the line.

Example

html,body,svg { height:100% }

<svg viewBox="0 0 10 10" xmlns="http://www.w3.org/2000/svg">
  <line x1="1" x2="9" y1="1" y2="5" stroke="red"   />
  <line x1="1" x2="9" y1="5" y2="5" stroke="green" />
  <line x1="1" x2="9" y1="9" y2="5" stroke="blue"  />
</svg>

linearGradient

For <linearGradient>, y1 defines the y coordinate of the starting point of the gradient vector used to map the gradient stop values. The exact behavior of this attribute is influenced by the gradientUnits attributs

Example

html,body,svg { height:100% }

<svg viewBox="0 0 20 10" xmlns="http://www.w3.org/2000/svg">
  <!--
  By default the gradient vector start at the top left
  corner of the bounding box of the shape it is applied to.
  -->
  <linearGradient y1="0%" id="g0">
    <stop offset="5%"  stop-color="black" />
    <stop offset="50%" stop-color="red"   />
    <stop offset="95%" stop-color="black" />
  </linearGradient>

  <rect x="1"  y="1" width="8" height="8" fill="url(#g0)" />

  <!--
  Here the gradient vector start at the bottom left
  corner of the bounding box of the shape it is applied to.
  -->
  <linearGradient y1="100%" id="g1">
    <stop offset="5%"  stop-color="black" />
    <stop offset="50%" stop-color="red"   />
    <stop offset="95%" stop-color="black" />
  </linearGradient>

  <rect x="11" y="1" width="8" height="8" fill="url(#g1)" />
</svg>

Specifications