d2bTween Centroid

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This function is used to tween a centroid from one position to another.

# d2b.tweenCentroid(context, arc, [rotate])

Tween the context centroid position, which may be either a d3-selection of svg path elements or a corresponding d3-transition.

The previous centroid will be derived from the node's this.current "sticky" property.

The arc should be a d3-arc. This will help the tween function locate the centroid properties (e.g. innerRadius, outerRadius, startAngle, endAngle).

Additionally, a rotate accessor may be supplied as a function or degree value. This will be used to decide the rotation transformation to be used in tweening the context.

var arc = d3.arc();

  .innerRadius(function (d) { return d.innerRadius; })
  .outerRadius(function (d) { return d.outerRadius; })
  .startAngle(function (d) { return d.startAngle; })
  .endAngle(function (d) { return d.endAngle; });

var path = d3.select('path'),
    text = d3.select('text');

var datum = {
  innerRadius: 140,
  outerRadius: 150,
  startAngle: 0,
  endAngle: Math.PI / 2

    .call(d2b.tweenArc, arc);

    .call(d2b.tweenCentroid, arc);

Every tick of the tweening transition or the instantaneous update when no transition is used, the current state of the centroid position will be saved on the node's this.current property. This means that only one d2b tween should be applied to a specific node. If multiple tweens are needed it is recommended to use nested svg g containers.

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