Looking for a way for the user to rotate an annotation

Hi Andrew, thanks for the response and it makes sense. I am trying to implement rotation behavior for the box annotation in my app. I am able to achieve that but the problem I am right now I am facing is, when I rotate the box, the original thumbs (for resizing the box there inside AdornerLayer canvas) are stick with their location only. Please check the image I have attached. So I do not know how to make the orignal adorner and thumbs by in sync when the box rotate. Also here is the code I have created for rotatedbox. It would be a great help if you can look into it. public class RotatedRactangle : BoxAnnotation { #region Variables private Canvas _adornerCanvas; private Thumb _rotateThumb; private double _initialAngle; private RotateTransform _rotateTransform; private Vector _startVector; private Point _centerPoint; private IAnnotationResizeAdorner _adorner; #endregion #region Constructor public RotatedRactangle() { // DefaultStyleKey = “RotatedRactangleStyle”; } #endregion #region Override Methods public override void OnApplyTemplate() { base.OnApplyTemplate(); this.RenderTransformOrigin = new Point(0.5d, 0.5d); } protected override void RemoveAdorners(Canvas adornerLayer) { //Delete any existing explicite added thumb. if (adornerLayer.Children.Count > 0) { for (int index = 0; index < adornerLayer.Children.Count; index++) { if (adornerLayer.Children[index] is Thumb childThumb) { _rotateThumb.DragDelta -= _rotateThumb_DragDelta; _rotateThumb.DragStarted -= _rotateThumb_DragStarted; adornerLayer.Children.Remove(childThumb); } } } base.RemoveAdorners(adornerLayer); } protected override void AddAdorners(Canvas adornerLayer) { _adornerCanvas = adornerLayer; base.AddAdorners(adornerLayer); _adorner = adornerLayer.Children[0] as IAnnotationResizeAdorner; if (adornerLayer.Children[1] is Thumb thumb) { _rotateThumb = new Thumb { Style = thumb.Style }; _rotateThumb.DragDelta += _rotateThumb_DragDelta; _rotateThumb.DragStarted += _rotateThumb_DragStarted; //adornerLayer.Children.Add(_rotateThumb); if(this.VisualChildrenCount == 1) this.AddChild(_rotateThumb); SetRotateThumbLocation(); } } public override void OnDragDelta() { base.OnDragDelta(); SetRotateThumbLocation(); } protected override void SetBasePoint(Point newPoint, int index, IAxis xAxis, IAxis yAxis) { Debug.WriteLine(index); base.SetBasePoint(newPoint, index, xAxis, yAxis); } protected override Size ArrangeOverride(Size arrangeBounds) { return base.ArrangeOverride(arrangeBounds); } #endregion #region Methods private void _rotateThumb_DragStarted(object sender, DragStartedEventArgs e) { _centerPoint = this.TranslatePoint( new Point(this.Width * this.RenderTransformOrigin.X, this.Height * this.RenderTransformOrigin.Y), _adornerCanvas); Point startPoint = Mouse.GetPosition(_adornerCanvas); _startVector = Point.Subtract(startPoint, _centerPoint); _rotateTransform = this.RenderTransform as RotateTransform; if (_rotateTransform == null) { RenderTransform = new RotateTransform(0); _initialAngle = 0; } else { _initialAngle = _rotateTransform.Angle; } } private void _rotateThumb_DragDelta(object sender, DragDeltaEventArgs e) { Point currentPoint = Mouse.GetPosition(_adornerCanvas); Vector deltaVector = Point.Subtract(currentPoint, _centerPoint); double angle = Vector.AngleBetween(_startVector, deltaVector); RotateTransform rotateTransform = this.RenderTransform as RotateTransform; rotateTransform.Angle = _initialAngle + Math.Round(angle, 0); _adorner.UpdatePositions(); SetRotateThumbLocation(); } private void SetRotateThumbLocation() { _rotateThumb.VerticalAlignment = VerticalAlignment.Center; _rotateThumb.HorizontalAlignment = HorizontalAlignment.Left; } private void UpdateAdornerLocation() { } #endregion }

Sorry for this unformatted comment above, I am not sure how to formate the code so it looks readable from the comment I have made. Also not able to attached image here. But I guess if you paste the code and run it, things will make sense, which I trying to convey here. Thanks.