Trouble displaying image in PictureBox with Zoom and Pan

Question

I'm having some trouble displaying an image in a PictureBox in my Windows Forms application. I want to zoom and move the Bitmap inside the PictureBox. I have an object RectangleF that hold the location and the size of the Bitmap inside the PictureBox. I need to process the Bitmap before to assign to the PictureBox and for this reason I'm using a method called Apply to create a new Bitmap image from an existing one and then trying to display it in the PictureBox.

This is the code:

public Bitmap Apply(Bitmap image)
        {
        
            //_drawingRect contains the location of the Bitmap in the PictureBox and the size of the Bitmap
            
            //The result image
            Bitmap result = new Bitmap((int)_drawingRect.Width, (int)_drawingRect.Height);
            result.SetResolution(image.HorizontalResolution, image.VerticalResolution);

            using (Graphics graphics = Graphics.FromImage(result))
            {
                graphics.SetClip(_clipRect);


                graphics.DrawImage(image, _drawingRect,  new RectangleF(0,0 , image.Width, image.Height), GraphicsUnit.Pixel);
                return result;
            }


        }

I use the method in this way:

myPictureBox.SizeMode = PictureBoxSizeMode.CenterImage;
myPictureBox.Image = Apply(myBitmap);
myPictureBox.Refresh();

The image is being created and displayed successfully the first time but when I move the Image inside the PictureBox or when I zoom the Image, _drawingRect will change correctly, but the Image is cropped.

I think the problem could be the setting of myPictureBox.SizeMode = PictureBoxSizeMode.CenterImage;

Thanks in advice