Hello

First of all thanks for pyqtgraph, it's been really helpful.
I am trying to run a simulation on user defined graph so I wanted to let 
user create GraphItem.

Best way would be through mouse interactions - left click creates a node, 
drag between nodes creates a vertex,
right click on a vertex opens up a context menu for choosing vertex-cost.

Second way would be creating a graph with buttons/slidelists.

The problem is that I need to create and update the graph live.
Any idea how to do it ?

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