Hi,

I do have Zoom-In and Zoom-Out functionality on mouse scroll in my application.

The code used by me is as follows :

ScrollViewer scrollViewer = new ScrollViewer();
e.Handled = true;
Point p = e.GetPosition(Parent as ScrollViewer);
Point oldcurpos = diagram.ClientToDoc(p);

double newScrollX = diagram.ScrollX;
double newScrollY = diagram.ScrollY;

diagram.ZoomFactor += e.Delta / 60;

Rect newBounds = diagram.ClientToDoc(
new Rect(0, 0, scrollViewer.ActualWidth, scrollViewer.ActualHeight));

Point newcurpos = diagram.ClientToDoc(e.GetPosition(Parent as ScrollViewer));
double diffx = (oldcurpos.X - newcurpos.X);
double diffy = (oldcurpos.Y - newcurpos.Y);
newScrollX += diffx;
newScrollY += diffy;

newBounds.X = newScrollX;
newBounds.Y = newScrollY;
newBounds.Union(diagram.GetContentBounds(false, false));
newBounds.Inflate( 200, 200 );
diagram.Bounds = newBounds;

diagram.ScrollTo(new Point(newScrollX, newScrollY));

I want the diagram to always occupy the full containers area both in Zoom-Out and Zoom-In functionality. The code seems to work upto a certain extent of Zoom-Out value then it stops working and diagram start shrinking leaving white spaces.

Also I want the diagram to zoom to fit all the items in the diagram when its initialized. I have used the ZoomToFit method for that but it doesnt seems to work.

Any suggestions what is wrong with the code.

Thanks and Regards,
Anant Shukla.