/// <summary>
/// Returns highlight color for empty gantt element.
/// </summary>
/// <param name="parentColor">Parent color.</param>
/// <returns>Fill brush.</returns>
private static Brush _GetEmptyFillBrush(System.Drawing.Color parentColor)
{
Color color = Color.FromArgb(parentColor.A,
parentColor.R,
parentColor.G,
parentColor.B);
color.A = Convert.ToByte(color.A * HIGHLIGHTED_EMPTY_ELEMENT_MIN_TRANSPARENCY);
LinearGradientBrush resultBrush = new LinearGradientBrush();
resultBrush.StartPoint = new System.Windows.Point(0.5, 0);
resultBrush.EndPoint = new System.Windows.Point(0.5, 1);
resultBrush.GradientStops.Add(new GradientStop(color, 1));
color.A = Convert.ToByte(color.A * HIGHLIGHTED_EMPTY_ELEMENT_MAX_TRANSPARENCY);
resultBrush.GradientStops.Add(new GradientStop(color, 0));
// Freeze brush.
resultBrush = (LinearGradientBrush)resultBrush.GetCurrentValueAsFrozen();
return resultBrush;
}
