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Custom Connectors Tool Error When Zoom the Diagram

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Li
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Li asked on 14 May 2020, 10:40 AM
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 codeļ¼ŸThanks

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Dinko | Tech Support Engineer
Telerik team
answered on 19 May 2020, 06:50 AM

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
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Li
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answered on 22 May 2020, 10:00 AM
It works! Thanks a lot Dinko~Have a nice day
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Dinko | Tech Support Engineer
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Li
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