react-aim/lib/utils/pointInPolygon.js

Determine the cursor aim for triggering mouse events.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

exports.default = function (point, vs) {
  // ray-casting algorithm based on
  // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html

  var x = point[0],
      y = point[1];

  var inside = false;
  for (var i = 0, j = vs.length - 1; i < vs.length; j = i++) {
    var xi = vs[i][0],
        yi = vs[i][1];
    var xj = vs[j][0],
        yj = vs[j][1];

    var intersect = yi > y != yj > y && x < (xj - xi) * (y - yi) / (yj - yi) + xi;
    if (intersect) inside = !inside;
  }

  return inside;
};

; /**
   * @license MIT
   * @url https://github.com/substack/point-in-polygon
   */