Intriguing diagram, really poor implementation. Can't figure out how to switch the group focus, most click and drag attempts drag the image instead of moving i

Intriguing diagram, really poor implementation. Can't figure out how to switch the group focus, most click and drag attempts drag the image instead of moving it, and the zoom in/zoom out is not implemented in a usable way. You might want to look at libraries such as jsPlumb, d3js or sigmajs. Chrome Version 32.0.1700.107