|
//------------------------------------------------------------------------------
// Microsoft Avalon
// Copyright (c) Microsoft Corporation, 2001
//
// File: GeneralTransformGroup.cs
//------------------------------------------------------------------------------
using System;
using System.Windows;
using System.Windows.Media;
using System.ComponentModel;
using System.ComponentModel.Design.Serialization;
using System.Reflection;
using System.Collections;
using System.Collections.Generic;
using MS.Internal;
using System.Windows.Media.Animation;
using System.Globalization;
using System.Text;
using System.Runtime.InteropServices;
using System.Windows.Markup;
using System.Windows.Media.Composition;
using System.Diagnostics;
using MS.Internal.PresentationCore;
using SR = MS.Internal.PresentationCore.SR;
using SRID = MS.Internal.PresentationCore.SRID;
namespace System.Windows.Media
{
/// <summary>
/// GeneralTrasnform group
/// </summary>
[ContentProperty("Children")]
[Localizability(LocalizationCategory.None, Readability = Readability.Unreadable)]
public sealed partial class GeneralTransformGroup : GeneralTransform
{
#region Constructors
///<summary>
/// Default Constructor
///</summary>
public GeneralTransformGroup() { }
#endregion
/// <summary>
/// Transform a point
/// </summary>
/// <param name="inPoint">input point</param>
/// <param name="result">output point</param>
/// <returns>True if the point is transformed successfully</returns>
public override bool TryTransform(Point inPoint, out Point result)
{
result = inPoint;
if ((Children == null) || (Children.Count == 0))
{
return false;
}
Point inP = inPoint;
bool fPointTransformed = true;
// transform the point through each of the transforms
for (int i = 0; i < Children.Count; i++)
{
if (Children.Internal_GetItem(i).TryTransform(inPoint, out result) == false)
{
fPointTransformed = false;
}
inPoint = result;
}
return fPointTransformed;
}
/// <summary>
/// Transforms the bounding box to the smallest axis aligned bounding box
/// that contains all the points in the original bounding box
/// </summary>
/// <param name="rect">Input bounding rect</param>
/// <returns>Transformed bounding rect</returns>
public override Rect TransformBounds(Rect rect)
{
if ((Children == null) || (Children.Count == 0))
{
return rect;
}
Rect result = rect;
for (int i = 0; i < Children.Count; i++)
{
result = Children.Internal_GetItem(i).TransformBounds(result);
}
return result;
}
/// <summary>
/// Returns the inverse transform if it has an inverse, null otherwise
/// </summary>
public override GeneralTransform Inverse
{
get
{
ReadPreamble();
if ((Children == null) || (Children.Count == 0))
{
return null;
}
GeneralTransformGroup group = new GeneralTransformGroup();
for (int i = Children.Count - 1; i >= 0; i--)
{
GeneralTransform g = Children.Internal_GetItem(i).Inverse;
// if any of the transforms does not have an inverse,
// then the entire group does not have one
if (g == null)
return null;
group.Children.Add(g);
}
return group;
}
}
/// <summary>
/// Returns a best effort affine transform
/// </summary>
internal override Transform AffineTransform
{
[FriendAccessAllowed] // Built into Core, also used by Framework.
get
{
if ((Children == null) || (Children.Count == 0))
{
return null;
}
Matrix matrix = Matrix.Identity;
foreach (GeneralTransform gt in Children)
{
Transform t = gt.AffineTransform;
if (t != null)
{
matrix *= t.Value;
}
}
return new MatrixTransform(matrix);
}
}
}
}
|