pie.endAngle()

pie.endAngle([angle])

If angle is specified, sets the overall end angle of the pie to the specified function or number and returns this pie generator. If angle is not specified, returns the current end angle accessor, which defaults to:

function endAngle() {
  return 2 * Math.PI;
}

The end angle here means the overall end angle of the pie, i.e., the end angle of the last arc. The end angle accessor is invoked once, being passed the same arguments and this context as the pie generator. The units of angle are arbitrary, but if you plan to use the pie generator in conjunction with an arc generator, you should specify an angle in radians, with 0 at -y (12 o’clock) and positive angles proceeding clockwise.

The value of the end angle is constrained to startAngle ± τ, such that |endAngle - startAngle| ≤ τ.