Wpf中画板墨迹的移动与复位

之前做墨迹复位时总是会偏移，其实还是顺序的问题：下面是代码

前台界面：
<Window x:Class="_1_7Matrix.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="600" Width="1000">
    <Grid Name="grid" Background="White" >
        <InkCanvas Name="ink" Background="AliceBlue" Margin="0,60,0,0">InkCanvas>
        <Button Content="漫游" Height="23" HorizontalAlignment="Left" Margin="40,20,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
        <Button Content="复位" Height="23" HorizontalAlignment="Left" Margin="140,20,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />
        <Button Content="画图" Height="24" HorizontalAlignment="Left" Margin="249,20,0,0" Name="button3" VerticalAlignment="Top" Width="75" Click="button3_Click" />
        <Button Content="放大" Height="23" HorizontalAlignment="Left" Margin="347,21,0,0" Name="button4" VerticalAlignment="Top" Width="79" Click="button4_Click" />
        <Button Content="缩小" Height="23" HorizontalAlignment="Left" Margin="452,21,0,0" Name="button5" VerticalAlignment="Top" Width="75" Click="button5_Click" />
        <Button Content="清空" Height="23" HorizontalAlignment="Left" Margin="550,21,0,0" Name="button6" VerticalAlignment="Top" Width="75" Click="button6_Click" />
    Grid>
Window>

后台：
public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            grid.MouseDown += new MouseButtonEventHandler (grid_PreviewMouseDown);
            grid.MouseMove += new MouseEventHandler (grid_PreviewMouseMove);
            grid.MouseUp += new MouseButtonEventHandler (grid_PreviewMouseUp);
        }

        void grid_PreviewMouseUp(object sender, MouseButtonEventArgs e)
        {
            hashcode = 0;
            grid.ReleaseMouseCapture();
        }

        void grid_PreviewMouseMove(object sender, MouseEventArgs e)
        {
            if (sender.GetHashCode() != hashcode) return;
            Point NewPoint = e.GetPosition(grid);
            Vector v = NewPoint - oldpoint;
            oldpoint = NewPoint;

            Matrix m = Matrix .Identity;
            m.Translate(v.X, v.Y);
            ink.Strokes.Transform(m, false);
            matrixlist.Add(m);
            m.Invert();                                                //**所以提前反转**
            matrixlist2.Add( new MatrixAndBool (m, false));
        }

        int hashcode = 0;
        Point oldpoint = new Point();
        void grid_PreviewMouseDown(object sender, MouseButtonEventArgs e)
        {
            if (!canMove) return ;
            hashcode = sender.GetHashCode();
            oldpoint = e.GetPosition(grid);
            grid.CaptureMouse();
        }
        bool canMove = false ;
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            canMove = true;
        }
        List matrixlist = new List();
        List matrixlist2 = new List(); 
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            //matrixlist.Reverse();
            //matrixlist.ForEach(_ => {
            //    _.Invert();
            //    ink.Strokes.Transform(_,false);
            //});
            //matrixlist.Clear();

            matrixlist2.Reverse();
            matrixlist2.ForEach(_ =>
            {
                //_.M.Invert();                           //**此种集合在这里反转已经没有作用**
                ink.Strokes.Transform(_.M, true);
            });
            matrixlist2.Clear();
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            canMove = false;
        }

        private void button4_Click(object sender, RoutedEventArgs e)
        {
            Matrix m = Matrix .Identity;
            m.ScaleAt(1.1,1.1,ink.Width / 2, ink.Height / 2);
            m.OffsetX = 0;
            m.OffsetY = 0;
            ink.Strokes.Transform(m, true);
            //matrixlist.Add(m);
            m.Invert();
            matrixlist2.Add( new MatrixAndBool (m, true));
        }

        private void button5_Click(object sender, RoutedEventArgs e)
        {
            Matrix m = Matrix .Identity;
            m.ScaleAt(0.9, 0.9, ink.Width / 2, ink.Height / 2);
            m.OffsetX = 0;
            m.OffsetY = 0;
            ink.Strokes.Transform(m, true);
            //matrixlist.Add(m);
            m.Invert();
            matrixlist2.Add( new MatrixAndBool (m, true));
        }

        private void button6_Click(object sender, RoutedEventArgs e)
        {
            ink.Strokes.Clear();
        }

    }

    public class MatrixAndBool
    {
        public Matrix M { get; set; }
        public bool Value { get; set; }

        public MatrixAndBool(Matrix matrix,bool b)
        {
            M = matrix;
            Value = b;
        }
    }

效果图：