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Normal Topic Centre align tree layout (Read 2271 times)
binuvc
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Centre align tree layout
Feb 3rd, 2012 at 11:50am
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Hi,

We were looking in to the possibility of aligning a treelayout diagram to the center.

Now after applying the layout it is aligning to the left of the diagramlite control.
We are setting the width and height of the base control to some value.

The center aligning is required espicially when there are very few nodes in the diagram.

We are applying the layout as follows


            TreeLayout layout = new TreeLayout();
            layout.Balance = TreeLayoutBalance.Original;             
            layout.Type = TreeLayoutType.Centered;
            layout.Direction = TreeLayoutDirections.TopToBottom;
            layout.LinkStyle = TreeLayoutLinkType.Cascading3;
            layout.LevelDistance = 25;
            layout.NodeDistance = 10;
            layout.Arrange(diagramLite);


Please advice.

Thanks
BinuVC
  
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Stoyo
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Re: Centre align tree layout
Reply #1 - Feb 6th, 2012 at 7:46am
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Hi,

Try the following if you need to center the tree relatively to the visible area of the diagram:

Code
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private void OnCenterLayout(object sender, RoutedEventArgs e)
{
      if (diagram.Nodes.Count == 0)
            return;

      var root = diagram.Nodes[0];
      var r = root.Bounds;

      var view = diagram.Viewport;
      var centerX = view.X + view.Width / 2 - r.Width / 2;
      root.Bounds = new Rect(
            centerX, diagram.Bounds.Y + 5, r.Width, r.Height);

      var layout = new TreeLayout(root);
      layout.KeepRootPosition = true;
      // other layout settings ...
      layout.Arrange(diagram);
}


I hope that helps,
Stoyan
  
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