Draw Graphhopper search space

I am really interested in how to draw the algorithm search space, possibly during the execution. This is especially useful for educational purposes.
I am mostly interested in CH, but also Dijkstra, A* and others are very relevant.
Thank you!

I have used MiniGraphUI (desktop/swing):

But in recent times you should also try deck.gl for this:

E.g. use our new /spt endpoint here https://github.com/graphhopper/graphhopper/pull/1577

Or our debugging tiles view: https://github.com/graphhopper/graphhopper/pull/1572

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