Initial

BrightSharp/Diagrams/Thumbs/MoveThumb.cs

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+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Controls.Primitives;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace Diagrams
+{
+    public class MoveThumb : Thumb
+    {
+        private RotateTransform rotateTransform;
+        private ContentControl designerItem;
+
+        public MoveThumb()
+        {
+            DragStarted += new DragStartedEventHandler(this.MoveThumb_DragStarted);
+            DragDelta += new DragDeltaEventHandler(this.MoveThumb_DragDelta);
+        }
+
+
+        private void MoveThumb_DragStarted(object sender, DragStartedEventArgs e)
+        {
+            this.designerItem = DataContext as ContentControl;
+
+            if (this.designerItem != null)
+            {
+                this.rotateTransform = this.designerItem.RenderTransform as RotateTransform;
+            }
+        }
+
+        private void MoveThumb_DragDelta(object sender, DragDeltaEventArgs e)
+        {
+            if (this.designerItem != null)
+            {
+                Point dragDelta = new Point(e.HorizontalChange, e.VerticalChange);
+
+                if (this.rotateTransform != null)
+                {
+                    dragDelta = this.rotateTransform.Transform(dragDelta);
+                }
+                if (double.IsNaN(Canvas.GetLeft(this.designerItem))) Canvas.SetLeft(this.designerItem, 0);
+                if (double.IsNaN(Canvas.GetTop(this.designerItem))) Canvas.SetTop(this.designerItem, 0);
+
+                Canvas.SetLeft(this.designerItem, Canvas.GetLeft(this.designerItem) + dragDelta.X);
+                Canvas.SetTop(this.designerItem, Canvas.GetTop(this.designerItem) + dragDelta.Y);
+            }
+        }
+    }
+}