Hi,

Try the ScrollX and ScrollY properties.

Stoyan

You could set ScrollX/Y to negative coordinates to achieve that. However that doesn't seem to work correctly when ExteriorBrush is enabled - the area to the left and top isn't repainted, so for now set ExteriorBrush to null.

To calculate the ScrollX/Y values that center the document in the visible area, use fc.ClientToDoc(fc.ClientRectangle) to find out the visible area size in document coordinates, subtract the DocExtents from it and divide the result by 2.

Stoyan

The scroll properties will do the job, e.g. try this code:

fc.DocExtents = new RectangleF(0, 0, 100, 100);
fc.CreateBox(0, 0, 100, 100);

fc.ExteriorBrush = null;
RectangleF visible = fc.ClientToDoc(fc.ClientRectangle);
RectangleF doc = fc.DocExtents;

if (visible.Width > doc.Width)
  fc.ScrollX = doc.Left - (visible.Width - doc.Width) / 2;
if (visible.Height > doc.Height)
  fc.ScrollY = doc.Top - (visible.Height - doc.Height) / 2;


You can put the calculations in an OnResize event handler to keep the diagram centered. To reproduce the exact look from your screenshots your must set ExteriorBrush. However it doesn't work correctly if the ScrollX/Y point is outside DocExtents, we will fix that in next release.

Stoyan

We used the box only to show you where and how big the document area is and how it is centered. Remove the box and set

fc.ExteriorBrush = new SolidBrush(Color.Gray)

and you will see that the whole document is centered in the document area, however the top and left parts won't be drawn correctly.

Here is the next version, now the top and left parts should be painted correctly with the ExteriorBrush:

https://mindfusion.org/_beta/fcnet41.zip

It is very much untested, do not send it to your users yet.

Also you might want to set RestrictObjectsToDoc to InsideOnly in order to prevent moving items into the gray area.

Stoyan