Added:
These two scroll bars will affect the normal drag of the ShapeNode in the diagram. I don't want this action to happen. How can I achieve this? And I want to delete this scroll bar.

If there are no restrictions on the scroll bar, but why does it not drag to the right and drag down? I don’t want to let this happen, how can I solve it?

Hi,

Again, scrollbars do not restrict anything, just like any scrollbar in any application ever. They indicate your viewport location in a bigger document and allow you to navigate in it.

In your example, you can't scroll anymore, because you've reached the edge of the diagram documents bounding rectangle - as you see at the top left corner, the ruler shows the point -500,-500, which is the corner of your diagram document. To be able to scroll more, you need to increase the size of the diagram Bounds.

Regards,
Lyubo
MindFusion

Do you mean zooming in?

Try this:

        private void OnDiagramMouseWheel(object sender, MouseWheelEventArgs e)
        {
            var zoomRect = diagram.Viewport;
            if (e.Delta < 0)
                zoomRect.Inflate(10, 10);
            else
                zoomRect.Inflate(-10, -10);
            if (diagram.Bounds.Width >= zoomRect.Width && diagram.Bounds.Height >= zoomRect.Height &&
                zoomRect.Contains(imageNode.Bounds))
                diagram.ZoomToRect(zoomRect, true);

            // stop the scrollviewer from scrolling
            e.Handled = true;
        } 

Regards,
Lyubo
MindFusion

Hi Lyubo, I have been waiting for your answer

Sorry, Lyubo,
I wanted to say zooming-out last time, but the result:(zooming in) was sent to you. My requirement is that the minimum degree of zooming-out is the image size.How to achieve it?