protected override Color GetCurrentValueCore(Color defaultOriginValue, Color defaultDestinationValue, AnimationClock animationClock)
{
System.Diagnostics.Debug.Assert(animationClock.CurrentState != ClockState.Stopped);
if (!_isAnimationFunctionValid)
{
ValidateAnimationFunction();
}
double progress = animationClock.CurrentProgress.Value;
IEasingFunction easingFunction = EasingFunction;
if (easingFunction != null)
{
progress = easingFunction.Ease(progress);
}
double fromVal = _keyvalues[0];
double toVal = _keyvalues[1];
double target;
if (fromVal > toVal)
{
target = (1 - progress) * (fromVal - toVal) + toVal;
}
else
{
target = (toVal - fromVal) * progress + fromVal;
}
Color originColor = OriginColor;
if (target == 0)
{
return(originColor);
}
return(ColorEx.ChangeColorBrightness(originColor, target));
}