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Normal Topic How to auto arrange around a node (Read 3165 times)
karenm
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How to auto arrange around a node
Aug 6th, 2009 at 12:22am
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Hello,

I have a diagram using a spring layout. I want to be able to move a node to a new position, have that node retain its position, then automatically layout the remaining nodes around it. Not all the other nodes are directly linked to the node that is moved, but all nodes are linked together. Is there a way to implement this behaviour?

I tried using IgnoreLayout, which keeps the moved node where it is, but then all the other nodes do their layout without any reference to the moved node, this doesn't look any good.

Can someone provide any tips for this?

Thanks,
Karen.
  
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Stoyo
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Re: How to auto arrange around a node
Reply #1 - Aug 6th, 2009 at 9:21am
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Hi,

Try this:

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private void diagram_NodeModified(object sender, NodeEventArgs e)
{
	ArrangeAround(e.Node);
}

private void ArrangeAround(DiagramNode node)
{
	node.LayoutTraits[SpringLayoutTraits.Frozen] = true;

	SpringLayout layout = new SpringLayout();
	layout.NodeDistance = 80;
	layout.SplitGraph = false;

	// use the layout animation methods instead of Arrange, but
	// do not call EndArrange because it applies MultipleGraphsPlacement
	// and offsets all nodes to the top-left of the diagram
	layout.BeginArrange(diagram, diagram.Items);
	layout.Iterate(0, 500);

	node.LayoutTraits.Remove(SpringLayoutTraits.Frozen);
}


I hope that helps,
Stoyan
  
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karenm
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Re: How to auto arrange around a node
Reply #2 - Aug 7th, 2009 at 2:29am
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Perfect!  Thanks. 

I also tried this in the NodeModifying event to see if I could have the nodes following each other around the screen while the selected node is dragged about (i.e. before I release the mouse), but this caused choppy diagram view updates - is there an easy way to do this efficiently (i.e. to have smooth screen updates)?
  
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Stoyo
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Re: How to auto arrange around a node
Reply #3 - Aug 7th, 2009 at 9:21am
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In NodeModifying you could create the layout object, call BeginArrange and start a timer with a very small interval. In the timer event call Iterate with just a few iterations. You must also call the DiagramView.RecreateCacheImage method to refresh the cache image used while modifying items.

I hope that helps,
Stoyan
  
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