The user can push a node by dragging it to stick a bit into the negative X or Y (left of, or upwards) of the visible viewport. Such a node is only half-shown in the diagram.

I have built a little toolbar button endowed with the function "fit to view" in which i do a union of nodes' sizes, with the intention to ZoomToRect.

e.g.

foreach (DiagramNode c in Diagram.Nodes)
{
if (c is MyVisual && c.Visible)
{
sizeup.Union(c.Bounds);
}
}
Diagram.ZoomToRect(sizeup);

which works nice UNLESS the node sticks e.g. left bit outside the (scrollviewer endowed) viewport, in which case it zoomsTo only from 0,0 and leaves the half-shown node outside.

____

I also tried using the Diagram.ZoomToFit() but it looks like this method also ignores the negative values of the nodes i.e. nodes sticking atop or to left out of viewport.

Any idea how to snap to Rect that is beginning bit to left or above the 0 ?


cheers

Thank you!

actually then, 3 little lines do the job:

            Diagram.Bounds = sizeup;
            //resize with gap of 40 px & only visible items
            Diagram.ResizeToFitItems(40.0, true);
            Diagram.ZoomToFit();

If you mean the auto-resize feature, it sounds as you have set AutoResize to RightAndDown; set it to AllDirections instead.

I hope that helps,
Stoyan

Try this:

private void OnDiagramZoomFill(object sender, RoutedEventArgs e)
{
	var diagBounds = diagram.Bounds;
	diagram.ZoomToFit();

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

	var dx = viewerRect.Width > diagBounds.Width ?
		(viewerRect.Width - diagBounds.Width) / 2 : 0;
	var dy = viewerRect.Height > diagBounds.Height ?
		(viewerRect.Height - diagBounds.Height) / 2 : 0;

	diagBounds.Inflate(dx, dy);
	diagram.Bounds = diagBounds;
} 

I hope that helps,
Stoyan

i also added a derivate function/method segment of the one above, that trims the scrollviewer back to diagram size, so it does not get wildly oversized through zooming/moving nodes around:

            SequenceVisualDiagram.ResizeToFitItems(0.0, true);
            var viewerRect = new Rect(0, 0,
                             ScrollV.ActualWidth,
                             ScrollV.ActualHeight);
            viewerRect = SequenceVisualDiagram.ClientToDoc(viewerRect);
            Log.Debug("diag trim..");
            SequenceVisualDiagram.Bounds = viewerRect; 

that one i bound to "resize to fit" toolbar button that centers all nodes & trims down the scrollviewer i.e. diagram size.