Change Layout Dynamically

GoXam
1

Hi,

I am trying to change the diagram layout dynamically from TreeLayout to ForceDirected layout using the following code. The line of code I thought would work gets a compile error. How can I make the layout change? AnimationTime property and LayoutDiagram() work.

    private void DoLayout_Click(object sender, RoutedEventArgs e)
    {
        myDiagram.LayoutManager.AnimationTime = 2000;
        <font color="#cc3333">//myDiagram.Layout = Northwoods.GoXam.Layout.ForceDirectedLayout;</font>
        myDiagram.LayoutDiagram();   
    }

Also, could show me how to zoom layout to 50% and zoom to fit?

Thanks
Rich

2

That’s not an enum, but a class, so you need to allocate it:
myDiagram.Layout = new ForceDirectedLayout();

You can “zoom” by setting the DiagramPanel.Scale property.
At any time you can do:
myDiagram.Panel.Scale = 0.5;

If you just want the diagram to start off at that scale:
<go:Diagram InitialScale=“0.5” … />

If you want the diagram to always be zoomed-to-fit, set:
<go:Diagram Stretch=“Uniform” … />
or set the DiagramPanel.Stretch property.
(FYI, this is what the default ControlTemplate for Overview does.)

If you want the diagram to be zoomed-to-fit only initially:
<go:Diagram InitialStretch=“Uniform” …/>
or set the Diagram.InitialStretch property.

If you want to only do it once in a while, you can calculate the scale you want and set the DiagramPanel.Scale. By default it does:

Rect oldbounds = this.DiagramBounds; double xscale = this.ViewportWidth/Math.Max(oldbounds.Width, 1); double yscale = this.ViewportHeight/Math.Max(oldbounds.Height, 1); xscale = Math.Min(xscale, 1); yscale = Math.Min(yscale, 1); this.Scale = Math.Min(xscale, yscale);
I suppose an alternative is to set DiagramPanel.Stretch to Uniform and then immediately back to Unstretched again.