function arcTween(a) {
    var i = d3.interpolate({x: a.x0, dx: a.dx0}, a);
    return function(t) {
      var b = i(t);
      a.x0 = b.x;
      a.dx0 = b.dx;
      return _this.arc(b);
    };
  }
// Interpolate the arcs in data space.
Interpolate the arcs in data space.
Interpolate the arcs in data space .
function arcTween(a) {
    var i = d3.interpolate({x: a.x0, dx: a.dx0}, a);
    return function(t) {
      var b = i(t);
      a.x0 = b.x;
      a.dx0 = b.dx;
      return _this.arc(b);
    };
  }
function arcTween ( a ) { var i = d3 . interpolate ( { x : a . x0 , dx : a . dx0 } , a ) ; return function ( t ) { var b = i ( t ) ; a . x0 = b . x ; a . dx0 = b . dx ; return _this . arc ( b ) ; } ; }
Interpolate the arcs in data space.
Interpolate the arcs in data space .