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I am using a DoubleAnimation to anamiate the Angle property of a RotationTransform. Several times per second, I need to change the rate of the rotation in response to external data so that the rotation speeds up and/or slows down (smoothly) over time. I am currently doing this by using a DoubleAnimation that repeats forever from 0.0 to 360.0 with duration X, then several times per second: Grab a new value from external data Modify the rate on the DoubleAnimation to that value Re-Apply the DoubleAnimation to the Angle property again Note: I did find that I had to change the To and From properties on the animation to "current angle" and "current angle+360" - lucky for me RotationTransform has no trouble with angles > 360 degrees - to prevent starting the rotation over again from zero angle. My question is: Is this reasonable? It does not seem so. Continously applying new DoubleAnimations to the Angle property on a rotation transform seems wrong - sort of like I am letting WPF animate the rotation, while I am animating the rotation speed myself. Is there a better way?

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