Code:
/ DotNET / DotNET / 8.0 / untmp / WIN_WINDOWS / lh_tools_devdiv_wpf / Windows / wcp / Framework / MS / Internal / AnimatedTypeHelpers.cs / 1 / AnimatedTypeHelpers.cs
// AnimatedTypeHelpers.cs using System; using System.Windows; using System.Windows.Media; using System.Windows.Media.Media3D; namespace MS.Internal.PresentationFramework { internal static class AnimatedTypeHelpers { #region Interpolation Methods ////// To support "By" animations and to make our internal code easily readable /// this method will interpolate between Auto and non-Auto values treating /// the Auto value essentially as a zero value for whatever the UnitType /// of the other value is via the fact that Auto returns 0.0 for the Value /// property rather than throwing an exception as a Nullable would. /// /// If both values are Auto, we return Auto. /// /// The from value. /// The to value. /// The progress value used for interpolation. ///The interpolated value. ////// Thrown if one of the values is a percent and the other is not. /// private static Double InterpolateDouble(Double from, Double to, Double progress) { return from + ((to - from) * progress); } internal static Thickness InterpolateThickness(Thickness from, Thickness to, double progress) { return new Thickness( InterpolateDouble(from.Left, to.Left, progress), InterpolateDouble(from.Top, to.Top, progress), InterpolateDouble(from.Right, to.Right, progress), InterpolateDouble(from.Bottom, to.Bottom, progress)); } #endregion #region Add Methods private static Double AddDouble(Double value1, Double value2) { return value1 + value2; } internal static Thickness AddThickness(Thickness value1, Thickness value2) { return new Thickness( AddDouble(value1.Left, value2.Left), AddDouble(value1.Top, value2.Top), AddDouble(value1.Right, value2.Right), AddDouble(value1.Bottom, value2.Bottom)); } #endregion #region Subtract Methods internal static Thickness SubtractThickness(Thickness value1, Thickness value2) { return new Thickness( value1.Left - value2.Left, value1.Top - value2.Top, value1.Right - value2.Right, value1.Bottom - value2.Bottom); } #endregion #region GetSegmentLength Methods private static Double GetSegmentLengthDouble(Double from, Double to) { return Math.Abs(to - from); } internal static double GetSegmentLengthThickness(Thickness from, Thickness to) { double totalLength = Math.Pow(GetSegmentLengthDouble(from.Left, to.Left), 2.0) + Math.Pow(GetSegmentLengthDouble(from.Top, to.Top), 2.0) + Math.Pow(GetSegmentLengthDouble(from.Right, to.Right), 2.0) + Math.Pow(GetSegmentLengthDouble(from.Bottom, to.Bottom), 2.0); return Math.Sqrt(totalLength); } #endregion #region Scale Methods private static Double ScaleDouble(Double value, Double factor) { return value * factor; } internal static Thickness ScaleThickness(Thickness value, double factor) { return new Thickness( ScaleDouble(value.Left, factor), ScaleDouble(value.Top, factor), ScaleDouble(value.Right, factor), ScaleDouble(value.Bottom, factor)); } #endregion #region IsValidAnimationValue Methods private static bool IsValidAnimationValueDouble(Double value) { if (IsInvalidDouble(value)) { return false; } return true; } internal static bool IsValidAnimationValueThickness(Thickness value) { // At least one of the sub-values must be an interpolatable length. if ( IsValidAnimationValueDouble(value.Left) || IsValidAnimationValueDouble(value.Top) || IsValidAnimationValueDouble(value.Right) || IsValidAnimationValueDouble(value.Bottom)) { return true; } return false; } #endregion #region GetZeroValueMethods private static Double GetZeroValueDouble(Double baseValue) { return 0.0; } internal static Thickness GetZeroValueThickness(Thickness baseValue) { return new Thickness( GetZeroValueDouble(baseValue.Left), GetZeroValueDouble(baseValue.Top), GetZeroValueDouble(baseValue.Right), GetZeroValueDouble(baseValue.Bottom)); } #endregion #region Helpers private static bool IsInvalidDouble(double value) { return Double.IsInfinity(value) || DoubleUtil.IsNaN(value); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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