RadDiagram PointToScreen and PointToClient accuracy

[Hocine]

Hi,

I"m working with RadDiagram where I added several RadDiagramContainerShape and RadDiagramShape. The main container is a RadDiagramContainerShape and it is positioned at (0, 0) according to the RadDiagram.

When I click on the top left corner of the main container, at the red dot in the attached image, the button click is (41,39). Then I use PointToClient to get the position in the RadDiagram and I have (35, -40), knowing that it is supposed to be around (0, 0). Then to make sure of this I calculated the  PointToScreen using the main container location which is (0, 0). The result was (6, 79), but it is supposed to be around the button click (41,39).

In addition, when I drag and drop shapes to my main container it never goes to the cursor position because all what is mentioned above is not accurate.

Is this normal, and what can I do to fix this?
Thanks in advance for your help!

[Peter]

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

[Hocine]

 

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);
        }

[Peter]

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