score:2

Accepted answer

Donut3D definition is right there in the page and its draw method as well

Donut3D.draw=function(id, data, x /*center x*/, y/*center y*/, 
        rx/*radius x*/, ry/*radius y*/, h/*height*/, ir/*inner radius*/)

there you can see what each value stands for

score:2

From https://gist.github.com/NPashaP/9994181

         Donut3D.draw=function(id, data, x /*center x*/, y/*center y*/, 
        rx/*radius x*/, ry/*radius y*/, h/*height*/, ir/*inner radius*/)

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