public override IObservable <Color> DoTransition(IObservable <double> progress, Color oldValue, Color newValue)
{
return(progress.Select(p =>
{
(double L1, double a1, double b1) = Lab.ToLab(oldValue);
(double L2, double a2, double b2) = Lab.ToLab(newValue);
double f = Easing.Ease(p);
byte A = (byte)(oldValue.A + ((double)newValue.A - oldValue.A) * f);
Lab.FromLab(L1 + (L2 - L1) * f, a1 + (a2 - a1) * f, b1 + (b2 - b1) * f, out byte R, out byte G, out byte B);
return Color.FromArgb(A, R, G, B);
}));
}
public override IObservable <IBrush> DoTransition(IObservable <double> progress, IBrush oldBrush, IBrush newBrush)
{
return(progress.Select(p =>
{
if (oldBrush is SolidColorBrush oldSolidBrush && newBrush is SolidColorBrush newSolidBrush)
{
Color oldValue = oldSolidBrush.Color;
Color newValue = newSolidBrush.Color;
(double L1, double a1, double b1) = Lab.ToLab(oldValue);
(double L2, double a2, double b2) = Lab.ToLab(newValue);
double f = Easing.Ease(p);
byte A = (byte)(oldValue.A + ((double)newValue.A - oldValue.A) * f);
Lab.FromLab(L1 + (L2 - L1) * f, a1 + (a2 - a1) * f, b1 + (b2 - b1) * f, out byte R, out byte G, out byte B);
return new SolidColorBrush(Color.FromArgb(A, R, G, B));
}