Problem with the line adorner.

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C#

WPF

Hi,

I have the following code for line adorner. I don't know whats go wrong with it but it did not work to move a line. either line moves or we can change only size. Please make suggestion so as to correct it.

public class LineAdorner : Adorner
        {
            bool IsStartPoint = false;
            bool IsControlModeOn = false;
            bool IsMisPoint = false;

            Size size = new Size(10, 10);
            SnapToGrid snap = new SnapToGrid();

            public LineAdorner(UIElement adornedElement)
                : base(adornedElement)
            {
                this.MouseLeftButtonDown += new MouseButtonEventHandler(LineAdorner_MouseLeftButtonDown);
                this.MouseLeftButtonUp += new MouseButtonEventHandler(LineAdorner_MouseLeftButtonUp);
                this.MouseMove += new MouseEventHandler(LineAdorner_MouseMove);
            }

            void LineAdorner_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
            {
                if (Keyboard.Modifiers == ModifierKeys.Control)
                    IsControlModeOn = true;

                System.Windows.Shapes.Line line = this.AdornedElement as System.Windows.Shapes.Line;
                LineItem lineItem = line.DataContext as LineItem;
                Point p = snap.Snap(e.GetPosition(line), SnapToGrid.SnapMode.Move);

                double dStart = 0.0;
                double dEnd = 0.0;
                double dmid = 0.0;

                if (!this.IsMouseCaptured)
                {
                    dStart = Math.Sqrt(Math.Pow(line.X1 - p.X, 2) + Math.Pow(line.Y1 - p.Y, 2));
                    dEnd = Math.Sqrt(Math.Pow(line.X2 - p.X, 2) + Math.Pow(line.Y2 - p.Y, 2));
                    dmid = Math.Sqrt(Math.Pow((((line.X2 + line.X1) / 2) - p.X), 2) + Math.Pow((((line.Y2 + line.Y1) / 2) - p.Y), 2));
                }

                if (IsControlModeOn)
                {
                    if (this.IsMouseCaptured)
                    {
                        if (IsStartPoint)
                        {
                            line.X1 = p.X;
                            line.Y1 = p.Y;
                        }
                        else
                        {
                            line.X2 = p.X;
                            line.Y2 = p.Y;
                        }

                        this.InvalidateVisual();
                        this.ReleaseMouseCapture();

                        IsControlModeOn = false;
                    }
                    else
                    {
                        if (dStart < dEnd)
                            IsStartPoint = true;
                        else
                            IsStartPoint = false;

                        this.InvalidateVisual();
                        this.CaptureMouse();
                    }
                }
                else
                {
                    if (!this.IsMouseCaptured)
                    {
                        if (dStart < dEnd)
                            IsStartPoint = true;
                        else
                            IsStartPoint = false;

                        this.InvalidateVisual();
                        this.CaptureMouse();
                    }
                }
            }

            void LineAdorner_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
            {
                if (!IsControlModeOn)
                {
                    if (this.IsMouseCaptured)
                    {
                        System.Windows.Shapes.Line line = this.AdornedElement as System.Windows.Shapes.Line;
                        LineItem lineItem = line.DataContext as LineItem;
                        Point p = snap.Snap(e.GetPosition(line), SnapToGrid.SnapMode.Move);

                        if (IsStartPoint)
                        {
                            line.X1 = p.X;
                            line.Y1 = p.Y;
                        }
                        else
                        {
                            line.X2 = p.X;
                            line.Y2 = p.Y;
                        }
                        this.InvalidateVisual();
                        this.ReleaseMouseCapture();
                    }
                }
            }

            void LineAdorner_MouseMove(object sender, MouseEventArgs e)
            {
                if (this.IsMouseCaptured)
                {
                    if (this.AdornedElement.GetType() == typeof(System.Windows.Shapes.Line))
                    {
                        System.Windows.Shapes.Line line = this.AdornedElement as System.Windows.Shapes.Line;
                        LineItem lineItem = line.DataContext as LineItem;
                        Point p = snap.Snap(e.GetPosition(line), SnapToGrid.SnapMode.Move);

                        // mode: move start or end point


                        if (IsStartPoint)
                        {
                            line.X1 = p.X;
                            line.Y1 = p.Y;
                        }
                        else 
                        {
                            line.X2 = p.X;
                            line.Y2 = p.Y;
                        }

                        // mode: move line


                        //if (IsStartPoint)
                        //{
                        //    double dX = line.X1 - p.X;
                        //    double dY = line.Y1 - p.Y;
                        //    Point pEnd = new Point(line.X2 - dX, line.Y2 - dY);

                        //    line.X1 = p.X;
                        //    line.Y1 = p.Y;
                        //    line.X2 = pEnd.X;
                        //    line.Y2 = pEnd.Y;
                        //}
                        //else
                        //{
                        //    double dX = line.X2 - p.X;
                        //    double dY = line.Y2 - p.Y;
                        //    Point pStart = new Point(line.X1 - dX, line.Y1 - dY);

                        //    line.X1 = pStart.X;
                        //    line.Y1 = pStart.Y;
                        //    line.X2 = p.X;
                        //    line.Y2 = p.Y;
                        //}


                        this.InvalidateVisual();
                    }
                }
            }