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import constant from "./constant";
import {x as pointX, y as pointY} from "./point";
import Diagram, {epsilon} from "./Diagram";

export default function() {
  var x = pointX,
      y = pointY,
      extent = null;

  function voronoi(data) {
    return new Diagram(data.map(function(d, i) {
      var s = [Math.round(x(d, i, data) / epsilon) * epsilon, Math.round(y(d, i, data) / epsilon) * epsilon];
      s.index = i;
      s.data = d;
      return s;
    }), extent);
  }

  voronoi.polygons = function(data) {
    return voronoi(data).polygons();
  };

  voronoi.links = function(data) {
    return voronoi(data).links();
  };

  voronoi.triangles = function(data) {
    return voronoi(data).triangles();
  };

  voronoi.x = function(_) {
    return arguments.length ? (x = typeof _ === "function" ? _ : constant(+_), voronoi) : x;
  };

  voronoi.y = function(_) {
    return arguments.length ? (y = typeof _ === "function" ? _ : constant(+_), voronoi) : y;
  };

  voronoi.extent = function(_) {
    return arguments.length ? (extent = _ == null ? null : [[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]], voronoi) : extent && [[extent[0][0], extent[0][1]], [extent[1][0], extent[1][1]]];
  };

  voronoi.size = function(_) {
    return arguments.length ? (extent = _ == null ? null : [[0, 0], [+_[0], +_[1]]], voronoi) : extent && [extent[1][0] - extent[0][0], extent[1][1] - extent[0][1]];
  };

  return voronoi;
}