DoubleKeyFrame is the base class for three types of double key frames: discrete, linear, and spline. Each of the three subclasses of DoubleKeyFrame represents a key frame with a distinct interpolation technique, indicated by its name: <LinearDoubleKeyFrame KeyTime="0:0:5|Uniform|Paced|30%" Value="3.0" /> <DiscreteDoubleKeyFrame KeyTime="0:0:5|Uniform|Paced|30%" Value="3.0" /> <SplineDoubleKeyFrame KeyTime="0:0:5|Uniform|Paced|30%" Value="3.0" > <SplineDoubleKeyFrame.KeySpline> <KeySpline ControlPoint1="5,5" ControlPoint2="10,10" /> </SplineDoubleKeyFrame.KeySpline> </SplineDoubleKeyFrame> All three DoubleKeyFrame subclasses determine when (KeyTime) the frame will reach the designated value (Value). KeyTime is specified in terms of hours:minutes:seconds. The Value attribute of all DoubleKeyFrame subclasses is a Double.
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