How to Increase Winforms Diagram Page size?

In our WinForms Diagram control, you can increase the diagram page size when dragging nodes beyond the diagram page border by using the PinPointChanged event. In this event, you can update the diagram model’s DocumentSize based on the node’s bounds to ensure that the page size expands as needed. We have provided the code snippet to achieve this.

Code Snippet:

(diagram1.Model.EventSink).PinPointChanged += Form1_PinPointChanged;


private void Form1_PinPointChanged(PinPointChangedEventArgs evtArgs)
{
   var currentWidth = diagram1.Model.DocumentSize.Width;
   var currentHeight = diagram1.Model.DocumentSize.Height;
   var nodeRight = (evtArgs.NodeAffected as Node).BoundingRectangle.Right;
   var nodeBottom = (evtArgs.NodeAffected as Node).BoundingRectangle.Bottom;
   diagram1.Model.DocumentSize = new PageSize(Math.Max(currentWidth, nodeRight), Math.Max(currentHeight, nodeBottom));
} 

Conclusion:

I hope you enjoyed learning about how to increase Winforms Diagram Page when dragging nodes beyond Page.

You can refer to our WinForms Diagram feature tour page to learn about its other groundbreaking feature representations and documentation. You can also explore our WinForms Diagram example to understand how to create and manipulate data.

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