Keep a copy of starting positions in label[i].sx & label[i].sy#6
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`label_array[i].sx` and `label_array[i].sy` are a copy of the initial positions; makes it easy to use the distance moved to change the label or the label class
Basic example:
```
.text(function(d) { return d.name + ' ' + Math.ceil(Math.sqrt((d.x-d.sx)*(d.x-d.sx) + (d.y-d.sy)*(d.y-d.sy))) });
```
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Makes it easier to draw lines from the starting point to the label, or do some computations with distances moved.