Hi ALL,

I have currently created a ShapeNode in the diagram. In the Diagram.MouseWheel event, the zoom setting has been set, and the minimum value of the zooming-out has been set to the size of the ShapeNode. When zooming-out reaches the minimum, it will cause ShapeNode to cover the Diagram.

When zooming-out reaches the minimum, I want to prevent ShapeNode from covering the Diagram. Where does the code need to be changed?

           var zoomRect = diagram.Viewport;
           var zoomStep = 10;
           if (e.Delta < 0)
            {
                zoomRect = new Rect
                (
                    Math.Max(ShapeBounds.X, zoomRect.X - zoomStep / 2),
                    Math.Max(ShapeBounds.Y, zoomRect.Y - zoomStep / 2),
                    Math.Min(ShapeBounds.Width, zoomRect.Width + zoomStep),
                    Math.Min(ShapeBounds.Height, zoomRect.Height + zoomStep)
                );
            }

Any assistance would be appreciated.

Cheers,

Jack

Yes, you are right. But I thought of another better. Is it possible to limit the maximum multiple of zoom-out operation under the condition of if (e.Delta <0), and the maximum multiple of zoom-in operation under the condition of if (e.Delta> 0). Is there sample code for my reference?

Yes, the code you gave me is zooming in and out at the center of the view, which is really nice.
For now I want to do this: I just told you to disable the ShapeNode from overwriting the view without changing the size of the original ShapdeNode.So I tried a new value for zoomOutMax: imageNode. Inflate (20, 20). Bounds. The results suggest imageNode does not contain the Inflate method.

Thanks to you, Lyubo. I did everything you said.