/// <summary>
/// Adds the values of the two specified brushes
/// and returns a new brush, which represents the addition's
/// result.
/// </summary>
/// <param name="a">the first brush.</param>
/// <param name="b">The second brush.</param>
/// <returns>
/// The result of the addition.
/// </returns>
protected override sealed Brush AddValues(Brush a, Brush b)
{
BrushAnimationInput transformedInput = BrushAnimationInputTransformer.Transform(a, b);
a = transformedInput.From;
b = transformedInput.To;
BrushAnimationValidator.ValidateBrushes(a, b);
return(BrushAnimationHelper.Instance.AddValues(a, b));
}
/// <summary>
/// Calculates the value of a key frame at the progress increment provided.
/// </summary>
/// <param name="baseValue">The value to animate from; typically the value of the previous key frame.</param>
/// <param name="keyFrameProgress">
/// A value between 0.0 and 1.0, inclusive, that specifies the percentage of time
/// that has elapsed for this key frame.
/// </param>
/// <returns>The output value of this key frame given the specified base value and progress.</returns>
protected override Brush InterpolateValueCore(Brush baseValue, double keyFrameProgress)
{
if (keyFrameProgress <= 0)
{
return(baseValue);
}
if (keyFrameProgress >= 1)
{
return(Value);
}
BrushAnimationValidator.ValidateBrushes(baseValue, Value);
return(BrushAnimationHelper.Instance.InterpolateValue(baseValue, Value, keyFrameProgress));
}
/// <summary>
/// Calculates the value of a key frame at the progress increment provided.
/// </summary>
/// <param name="baseValue">The value to animate from; typically the value of the previous key frame.</param>
/// <param name="easedProgress">
/// A value between 0.0 and 1.0, inclusive, that specifies the percentage of time
/// that has elapsed for this key frame.
/// This value has already been eased by the <see cref="IEasingFunction"/>.
/// </param>
/// <returns>The output value of this key frame given the specified base value and progress.</returns>
protected override Brush InterpolateValueAfterEase(Brush baseValue, double easedProgress)
{
if (easedProgress <= 0)
{
return(baseValue);
}
if (easedProgress >= 1)
{
return(Value);
}
BrushAnimationValidator.ValidateBrushes(baseValue, Value);
return(BrushAnimationHelper.Instance.InterpolateValue(baseValue, Value, easedProgress));
}
/// <summary>
/// Calculates the value of a key frame at the progress increment provided.
/// </summary>
/// <param name="baseValue">The value to animate from; typically the value of the previous key frame.</param>
/// <param name="splineProgress">
/// A value between 0.0 and 1.0, inclusive, that specifies the percentage of time
/// that has elapsed for this key frame.
/// The <see cref="KeySpline"/> has already been applied to this progress.
/// </param>
/// <returns>The output value of this key frame given the specified base value and progress.</returns>
protected override Brush InterpolateValueWithSplineProgress(Brush baseValue, double splineProgress)
{
if (splineProgress <= 0)
{
return(baseValue);
}
if (splineProgress >= 1)
{
return(Value);
}
BrushAnimationValidator.ValidateBrushes(baseValue, Value);
return(BrushAnimationHelper.Instance.InterpolateValue(baseValue, Value, splineProgress));
}
/// <summary>
/// Validates that the specified brushes satisfy all rules which
/// are required for the animation to be able to work.
/// </summary>
/// <param name="from">The origin brush.</param>
/// <param name="to">The destination brush.</param>
/// <exception cref="InvalidOperationException">
/// Thrown if one of the validation rules fails.
/// </exception>
protected override void ValidateAnimationValues(Brush from, Brush to)
{
BrushAnimationValidator.ValidateBrushes(from, to);
}