How to find and locate center of screen(drawing area)

@rahimhaji wrote:

Dear friends,

i have set of nodes and subnodes (left & right both the sides), i have to align and rearrafe it in the screen in their respective places while add/delete a node. Please help me to find center of the screen(chart drawing area). and if any easy way to place those in respective order pls help me.

please explain me, if i create a node, from where its x,y starts i mean center of node(box) or topleft of the node (box).

Thanks and Regards,
Syed Abdul Rahim

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