score:1
I am no expert in d3.js but I will share what I found out. The implemented algorithm for Voronoi diagrams is Fortune's algorithm. This is the classical algorithm to compute a Voronoi diagram. Inserting a new point is neither part of this algorithm nor of the function set documented for d3.js. But you are correct, inserting one new site does not require to redraw the whole diagram in theory.
You use the Voronoi diagram for NNS (nearest neighbour search). You could also use a 2d-tree to accomplish NNS. There insertion and removal is easier. A quick search revealed two implementations in javascript: kd-tree-javascript and kd-tree-js.
Source: stackoverflow.com
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