How can I get node screen Point

I find a node by key and I want to eject a dialog . So I want to get the node screen position.
I use below code, but it don’t work.

node = diagram.findNodeForKey(1);
var position = node.position;

the position value is not the screen position.

help me! thank you !

A node’s position is in document coordinates. You can translate document coordinates into view coordinates with: Diagram.transformDocToView(position):

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