/// <summary>
/// Given the easing functions output, find the approximate input that would generate it.
/// </summary>
/// <param name="easeType">The easing type</param>
/// <param name="easeOption">The easing option</param>
/// <param name="k">The output value to find the input for</param>
/// <returns></returns>
public static double CalculateInverse(EaseType easeType, EaseOption easeOption, double k, double errorTolerance = .000000001)
{
if (easeType == EaseType.Linear)
{
return(k);
}
return(CalculateInverse(GetEasingFunction(easeType, easeOption), k, errorTolerance));
}
public static Func <double, double> GetEasingFunction(EaseType easeType, EaseOption easeOption)
{
switch (easeType)
{
case EaseType.Quadratic:
switch (easeOption)
{
case EaseOption.In:
return(Quadratic.In);
case EaseOption.Out:
return(Quadratic.Out);
case EaseOption.InOut:
return(Quadratic.InOut);
}
break;
case EaseType.Cubic:
switch (easeOption)
{
case EaseOption.In:
return(Cubic.In);
case EaseOption.Out:
return(Cubic.Out);
case EaseOption.InOut:
return(Cubic.InOut);
}
break;
case EaseType.Quartic:
switch (easeOption)
{
case EaseOption.In:
return(Quartic.In);
case EaseOption.Out:
return(Quartic.Out);
case EaseOption.InOut:
return(Quartic.InOut);
}
break;
case EaseType.Quintic:
switch (easeOption)
{
case EaseOption.In:
return(Quintic.In);
case EaseOption.Out:
return(Quintic.Out);
case EaseOption.InOut:
return(Quintic.InOut);
}
break;
case EaseType.Sinusoidal:
switch (easeOption)
{
case EaseOption.In:
return(Sinusoidal.In);
case EaseOption.Out:
return(Sinusoidal.Out);
case EaseOption.InOut:
return(Sinusoidal.InOut);
}
break;
}
return(Linear);
}
public static double Calculate(EaseType easeType, EaseOption easeOption, double k)
{
return(GetEasingFunction(easeType, easeOption)(k));
}
public static double Specify(EaseType easeType, EaseOption easeOption, double k)
{
switch (easeType)
{
case EaseType.Quadratic:
switch (easeOption)
{
case EaseOption.In:
return(Quadratic.In(k));
case EaseOption.Out:
return(Quadratic.Out(k));
case EaseOption.InOut:
return(Quadratic.InOut(k));
}
break;
case EaseType.Cubic:
switch (easeOption)
{
case EaseOption.In:
return(Cubic.In(k));
case EaseOption.Out:
return(Cubic.Out(k));
case EaseOption.InOut:
return(Cubic.InOut(k));
}
break;
case EaseType.Quartic:
switch (easeOption)
{
case EaseOption.In:
return(Quartic.In(k));
case EaseOption.Out:
return(Quartic.Out(k));
case EaseOption.InOut:
return(Quartic.InOut(k));
}
break;
case EaseType.Quintic:
switch (easeOption)
{
case EaseOption.In:
return(Quintic.In(k));
case EaseOption.Out:
return(Quintic.Out(k));
case EaseOption.InOut:
return(Quintic.InOut(k));
}
break;
case EaseType.Sinusoidal:
switch (easeOption)
{
case EaseOption.In:
return(Sinusoidal.In(k));
case EaseOption.Out:
return(Sinusoidal.Out(k));
case EaseOption.InOut:
return(Sinusoidal.InOut(k));
}
break;
}
return(Linear(k));
}