implement

dotnet/AipsRT/Model/Whiteboard/Shapes/Arrow.cs

@@ -7,4 +7,11 @@ public class Arrow : Shape
     public Position EndPosition { get; set; }
     
     public int Thickness { get; set; }
+    
+    public override void Move(Position newPosition)
+    {
+        var difference = newPosition - EndPosition;
+        EndPosition += difference;
+        base.Move(newPosition);
+    }
 }

dotnet/AipsRT/Model/Whiteboard/Shapes/Line.cs

@@ -7,4 +7,11 @@ public class Line : Shape
     public Position EndPosition { get; set; }
     
     public int Thickness { get; set; }
+    
+    public override void Move(Position newPosition)
+    {
+        var difference = newPosition - EndPosition;
+        EndPosition += difference;
+        base.Move(newPosition);
+    }
 }

dotnet/AipsRT/Model/Whiteboard/Shapes/Map/ShapeMappingExtensions.cs

@@ -11,6 +11,7 @@ public static class ShapeMappingExtensions
             return new Rectangle()
             {
                 Id = shape.Id,
+                OwnerId = shape.AuthorId,
                 Position = new Position(shape.PositionX, shape.PositionY),
                 Color = shape.Color,
                 EndPosition = new Position(shape.EndPositionX!.Value, shape.EndPositionY!.Value),
@@ -23,6 +24,7 @@ public static class ShapeMappingExtensions
             return new Arrow()
             {
                 Id = shape.Id,
+                OwnerId = shape.AuthorId,
                 Position = new Position(shape.PositionX, shape.PositionY),
                 Color = shape.Color,
                 EndPosition = new Position(shape.EndPositionX!.Value, shape.EndPositionY!.Value),
@@ -35,6 +37,7 @@ public static class ShapeMappingExtensions
             return new Line()
             {
                 Id = shape.Id,
+                OwnerId = shape.AuthorId,
                 Position = new Position(shape.PositionX, shape.PositionY),
                 Color = shape.Color,
                 EndPosition = new Position(shape.EndPositionX!.Value, shape.EndPositionY!.Value),
@@ -47,6 +50,7 @@ public static class ShapeMappingExtensions
             return new TextShape()
             {
                 Id = shape.Id,
+                OwnerId = shape.AuthorId,
                 Position = new Position(shape.PositionX, shape.PositionY),
                 Color = shape.Color,
                 TextValue = shape.TextValue!,

dotnet/AipsRT/Model/Whiteboard/Shapes/Rectangle.cs

@@ -7,4 +7,11 @@ public class Rectangle : Shape
     public Position EndPosition { get; set; }
     
     public int BorderThickness { get; set; }
+
+    public override void Move(Position newPosition)
+    {
+        var difference = newPosition - Position;
+        EndPosition += difference;
+        base.Move(newPosition);
+    }
 }

dotnet/AipsRT/Model/Whiteboard/Shapes/Shape.cs

@@ -11,4 +11,9 @@ public abstract class Shape
     public Position Position { get; set; }
     
     public string Color { get; set; }
+
+    public virtual void Move(Position newPosition)
+    {
+        Position = newPosition;
+    }
 }