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Normal Topic How to position a diagram so that a particular node is in the center (Read 1916 times)
jlj30
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How to position a diagram so that a particular node is in the center
Dec 31st, 2012 at 4:57pm
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Hi,

I have a diagram which is rendered using the Java applet and has an Overview control placed in the upper left corner.
The diagram will almost always be bigger than the physical screen and will have scroll bars.

When the diagram is initially displayed, I would like the root node (I'm using TreeLayout) to be centered vertically and horizontally.  See the attached screenshot for an example of what I would like to do - Incident Management is the node in question.

Any suggestions on an approach?

Thanks in advance and Happy New Year (if it's not already 2013 where you are).

Jim
  
NetDiagram_-_centering_process_name_on_mind_map.png (Attachment deleted)
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Stoyo
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Re: How to position a diagram so that a particular node is in the center
Reply #1 - Jan 2nd, 2013 at 8:02am
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Hi,

Try calling bringIntoView from the AppletStarted handler:

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function onAppletStarted()
{
	var diagram = <%= diagramView.AppletElement %>.getDiagram();
	var view = <%= diagramView.AppletElement %>.getDiagramView();

	var root = diagram.getNodes().get(0);
	view.bringIntoView(root);
}


bringIntoView will center on the specified node if it isn't already shown in the current viewport, so it should work for the root shown in your screenshot. If the node is initially visible, bringIntoView does nothing and wouldn't center on your root if the diagram was smaller. In such case you could first scroll to a position where the root is off-screen, before calling bringIntoView.

I hope that helps,
Stoyan
  
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