RadDiagram PointToScreen and PointToClient accuracy

Hi Hocine,

The diagram container which contains all shapes and connectors can be zoomed (In or Out) and can be panned as well. So, you should transform the Mouse Location to diagram container (named MainPanel) coordinate in this way:

Telerik.WinControls.Layouts.RadMatrix transform = this.radDiagram1.DiagramElement.MainPanel.TotalTransform;
transform.Invert();
var transformedPosition = transform.TransformPoint(e.Location);//e.Location is Mouse Location

For example, you can print out and compare both coordinates: Mouse and Transformed coordinates in the Mouse Down Event:

        private void RadDiagram1_MouseDown(object sender, MouseEventArgs e)
        {
            Console.Write(e.Location + "");

            Telerik.WinControls.Layouts.RadMatrix transform = this.radDiagram1.DiagramElement.MainPanel.TotalTransform;
            transform.Invert();
            var transformedPosition = transform.TransformPoint(e.Location);

            Console.WriteLine(" " + transformedPosition);
        }

I hope this information is useful. 

Regards,
Peter
Progress Telerik

Hi Peter,

Knowing that the main container can be zoomed and moved using the pan tool I was able to solve my problem using this small method, note that Viewport is my RadDiagram.

   private void SetPoint(DragEventArgs e)
        {
            //Set the location of the drop
            var panOffset = Viewport.DiagramElement.MainPanel.PositionOffset;

            Point pointInViewport = Viewport.PointToClient(new System.Drawing.Point(e.X, e.Y));

            int iRealPositionX = Convert.ToInt32((pointInViewport.X - panOffset.Width) / Viewport.Zoom);
            int iRealPositionY = Convert.ToInt32((pointInViewport.Y - panOffset.Height) / Viewport.Zoom);

            MouseDropPoint = new Point(iRealPositionX, iRealPositionY);
        }

Hi Hocine,

I can confirm that these calculations are looks correct. Also, the way that you get the pan offset is OK.

Let me know if have other questions.

Regards,
Peter
Progress Telerik