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. ThekeyTimes
values that define the associated segment are the Bézier "anchor points", and thekeySplines
values are the control points. Thus, there must be one fewer sets of control points than there arekeyTimes
.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 |
---|
SVG Animations Level 2 # KeySplinesAttribute |