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WebVis contributions bubble chart

(This gist contains server-side code. In order to see it running, you should open it on WebVis.)

This example displays a simple bubble chart, in which each bubble is sized according to the amount of contributions a certain user has made to the WebVis laboratory. Data is read live from the underlying Neo4j graph DB through PHP.

The bubble chart is implemented as a force layout with a non-overlapping constraint (see this example), initialized with a radial displacement of the circles. A simpler, more efficient implementation using a circle packing layout can be found in this example.