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This is known variously as a spider chart or radar chart. enter image description here

There are a lot of JS libraries out there to draw them. My favo(u)rite is D3JS, which also has some good wrappers to facilitate use with AngularJs.

However, they are, as far as I can see, all one way data binding, meaning that my code provides the data and the library draws the chart.

I am looking for a similar library, or D3JS wrapper, with two way data binding. What I mean is that the user should be able to click on the data values (I have marked 3 of them in red) and drag them, and that should update my AngularJs data ($scope).

Preferably free for commercial use. Failing that, try to keep the price down :-)

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