static DefaultDrawingPrimitives()
{
RedToWhiteGradient = new LinearGradientBrush(Colors.Red, Colors.White, new Point(0, 0), new Point(1, 1));
RedToWhiteGradient.GradientStops.Add(new GradientStop(Colors.Red, 0.0));
RedToWhiteGradient.GradientStops.Add(new GradientStop(Colors.White, 1.0));
RedToWhiteGradient.Freeze();
WhiteToRedGradient = new LinearGradientBrush(Colors.LightGray, Colors.DarkRed, new Point(0, 0), new Point(1, 1));
WhiteToRedGradient.GradientStops.Add(new GradientStop(Colors.White, 0.0));
WhiteToRedGradient.GradientStops.Add(new GradientStop(Colors.Red, 1.0));
WhiteToRedGradient.Freeze();
BlackPen.Freeze();
}
/// <summary>
/// Get the current <see cref="GradientBrush"/> value for the specified progress between 0 to 1 inclusive.
/// </summary>
/// <param name="defaultOriginalBrush">
/// The default <see cref="GradientBrush"/> instance.
/// </param>
/// <param name="defaultDestinationBrush">
/// The default <see cref="GradientBrush"/> instance.
/// </param>
/// <param name="progress">
/// The current progress between 0 to 1 inclusive.
/// </param>
/// <returns>
/// The current <see cref="GradientBrush"/> value for the specified progress between 0 to 1 inclusive.
/// </returns>
protected override GradientBrush GetCurrentValue(
GradientBrush defaultOriginalBrush,
GradientBrush defaultDestinationBrush,
double progress)
{
if (AnimationBrush == null)
{
return(defaultOriginalBrush);
}
//
// Either no gradient stop defined or the current value is right at
// the start.
//
if (progress.IsCloseTo(MinimumValue) ||
distance.IsCloseTo(MinimumValue))
{
return(AnimationBrush);
}
GradientBrush brush = AnimationBrush.Clone();
brush.GradientStops.Clear();
double startOffset = StartOffset;
double offset = distance * progress;
foreach (GradientStop gradientStop in AnimationBrush.GradientStops)
{
double stepOffset = gradientStop.Offset + offset - startOffset;
if (stepOffset.IsLessThan(0))
{
continue;
}
// Stop shifting gradient stops further beyond maximum
if (stepOffset.IsCloseTo(MaximumValue))
{
break;
}
GradientStop step = new GradientStop(gradientStop.Color, gradientStop.Offset + offset);
brush.GradientStops.Add(step);
}
brush.Freeze();
return(brush);
}
