Custom Connectors Tool Error When Zoom the Diagram

[Li]

Hi ,I'm Using The sample of  Custom Connectors Tools, But after I zoom the Diagram,and  Then I use Control+Shift+mouse click to add a custom connector ,It can not add a Correct Connector on the shape, Where should I modify the code？Thanks

[Dinko | Tech Support Engineer]

Hello Li,

Thank you for your interest in our RadDiagram control for WPF.

To calculate the correct position when the diagram is zoom, you need to use the GetTransformedPoint() method of the RadDiagram. You can check the modified version of the MouseDown event handler from the mentioned example in your post.

public bool MouseDown(PointerArgs e)
{          
    this.areCtrlShiftDown = (Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift &&
                            (Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control;
    if (this.areCtrlShiftDown)
    {
        Point transformedPoint = Diagram.GetTransformedPoint(Mouse.GetPosition(Diagram));
        RadDiagramShape topShape = this.HitService.GetTopItemNearPoint(transformedPoint, 0) as RadDiagramShape;
        if (topShape != null)
        {
            var zoomLevel = this.diagram.Zoom;
                    
            RadDiagramConnector connector = new RadDiagramConnector() { }; 
            connector.Name = "NewConnector" + connector.GetHashCode().ToString();

            double xRatio = (transformedPoint.X - topShape.Bounds.X) / topShape.Width;
            double yRatio = (transformedPoint.Y - topShape.Bounds.Y) / topShape.Height;

            connector.Offset = new Point(xRatio, yRatio);
            topShape.Connectors.Add(connector);

            this.lastUsedShape = topShape;
            return true;
        }
    }
    return false;
}

Regards,
Dinko
Progress Telerik

[Li]

It works! Thanks a lot Dinko~Have a nice day