//---------------------------------------------------------------------------
//
// <copyright file=Matrix3DStack.cs company=Microsoft>
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// Description: This is a super simple Matrix3DStack implementation.
// MatrixStack (2D) is optimized to avoid boxig and copying
// of structs. This was written as a stop-gap to address
// a bug until we can use CodeGen here.
//
// History:
// 1/19/2004 : Microsoft - Created
//
//---------------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
namespace System.Windows.Media.Media3D
{
//
internal class Matrix3DStack
{
//------------------------------------------------------
//
// Constructors
//
//------------------------------------------------------
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
public void Clear()
{
_stack.Clear();
}
public Matrix3D Pop()
{
Matrix3D top = Top;
_stack.RemoveAt(_stack.Count - 1);
return top;
}
/// <summary>
/// Empty => [matrix]
/// tail | [top] => tail | [top] | [matrix * top]
/// </summary>
public void Push(Matrix3D matrix)
{
if (_stack.Count > 0)
{
matrix.Append(Top);
}
_stack.Add(matrix);
}
//------------------------------------------------------
//
// Public Properties
//
//------------------------------------------------------
public int Count
{
get
{
return _stack.Count;
}
}
public bool IsEmpty
{
get
{
return (_stack.Count == 0);
}
}
public Matrix3D Top
{
get
{
return _stack[_stack.Count - 1];
}
}
//------------------------------------------------------
//
// Public Events
//
//------------------------------------------------------
//------------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
private readonly List<Matrix3D> _stack = new List<Matrix3D>();
#endregion Private Fields
}
}
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