Change in transparency or darkening when moving away from the center of the graph camera.

[noxmyn]

Since the graph is not planar, it is necessary to somehow weed out both the display and the selection of remote nodes of the graph.

I think 2 modifications are needed:

1. the ability to change the transparency and brightness of the graph node color as it moves away
2. limit the selection area of the graph conditions to a certain area