keySplines

The keySplines attribute defines a set of Bézier curve control points associated with the keyTimes list, defining a cubic Bézier function that controls interval pacing.

This attribute is ignored unless the calcMode attribute is set to spline.

If there are any errors in the keySplines specification (bad values, too many or too few values), the animation will not occur.

You can use this attribute with the following SVG elements:

Example

<svg viewBox="0 0 120 120" xmlns="http://www.w3.org/2000/svg">
  <circle cx="60" cy="10" r="10">
    <animate attributeName="cx" dur="4s" calcMode="spline" repeatCount="indefinite"
        values="60; 110; 60; 10; 60" keyTimes="0; 0.25; 0.5; 0.75; 1"
        keySplines="0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1"/>
    <animate attributeName="cy" dur="4s" calcMode="spline" repeatCount="indefinite"
        values="10; 60; 110; 60; 10" keyTimes="0; 0.25; 0.5; 0.75; 1"
        keySplines="0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1; 0.5 0 0.5 1"/>
  </circle>
</svg>

Usage notes

Value <control-point> [ ; <control-point> ]* ;?
Default value None
Animatable No

The attribute value is a semicolon-separated list of control point descriptions.

  • <control-point>
    • : Each control point description is a set of four values: x1 y1 x2 y2, describing the Bézier control points for one time segment. The keyTimes values that define the associated segment are the Bézier "anchor points", and the keySplines values are the control points. Thus, there must be one fewer sets of control points than there are keyTimes. The values of x1 y1 x2 y2 must all be in the range 0 to 1.
  • Safari issues
    • :keyTimes values should be separated with semicolon without space before, f.e: keyTimes="0; 0.25; 0.5; 0.75; 1"

Specifications

Specification Status Comment
SVG Animations Level 2
The definition of 'keySplines' in that specification.		 Editor's Draft No change
Scalable Vector Graphics (SVG) 1.1 (Second Edition)
The definition of 'keySplines' in that specification.		 Recommendation Initial definition

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See also