jtBaseApp/node_modules/@turf/boolean-point-in-polygon/dist/js/index.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var invariant_1 = require("@turf/invariant");
// http://en.wikipedia.org/wiki/Even%E2%80%93odd_rule
// modified from: https://github.com/substack/point-in-polygon/blob/master/index.js
// which was modified from http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
/**
 * Takes a {@link Point} and a {@link Polygon} or {@link MultiPolygon} and determines if the point
 * resides inside the polygon. The polygon can be convex or concave. The function accounts for holes.
 *
 * @name booleanPointInPolygon
 * @param {Coord} point input point
 * @param {Feature<Polygon|MultiPolygon>} polygon input polygon or multipolygon
 * @param {Object} [options={}] Optional parameters
 * @param {boolean} [options.ignoreBoundary=false] True if polygon boundary should be ignored when determining if
 * the point is inside the polygon otherwise false.
 * @returns {boolean} `true` if the Point is inside the Polygon; `false` if the Point is not inside the Polygon
 * @example
 * var pt = turf.point([-77, 44]);
 * var poly = turf.polygon([[
 *   [-81, 41],
 *   [-81, 47],
 *   [-72, 47],
 *   [-72, 41],
 *   [-81, 41]
 * ]]);
 *
 * turf.booleanPointInPolygon(pt, poly);
 * //= true
 */
function booleanPointInPolygon(point, polygon, options) {
    if (options === void 0) { options = {}; }
    // validation
    if (!point) {
        throw new Error("point is required");
    }
    if (!polygon) {
        throw new Error("polygon is required");
    }
    var pt = invariant_1.getCoord(point);
    var geom = invariant_1.getGeom(polygon);
    var type = geom.type;
    var bbox = polygon.bbox;
    var polys = geom.coordinates;
    // Quick elimination if point is not inside bbox
    if (bbox && inBBox(pt, bbox) === false) {
        return false;
    }
    // normalize to multipolygon
    if (type === "Polygon") {
        polys = [polys];
    }
    var insidePoly = false;
    for (var i = 0; i < polys.length && !insidePoly; i++) {
        // check if it is in the outer ring first
        if (inRing(pt, polys[i][0], options.ignoreBoundary)) {
            var inHole = false;
            var k = 1;
            // check for the point in any of the holes
            while (k < polys[i].length && !inHole) {
                if (inRing(pt, polys[i][k], !options.ignoreBoundary)) {
                    inHole = true;
                }
                k++;
            }
            if (!inHole) {
                insidePoly = true;
            }
        }
    }
    return insidePoly;
}
exports.default = booleanPointInPolygon;
/**
 * inRing
 *
 * @private
 * @param {Array<number>} pt [x,y]
 * @param {Array<Array<number>>} ring [[x,y], [x,y],..]
 * @param {boolean} ignoreBoundary ignoreBoundary
 * @returns {boolean} inRing
 */
function inRing(pt, ring, ignoreBoundary) {
    var isInside = false;
    if (ring[0][0] === ring[ring.length - 1][0] &&
        ring[0][1] === ring[ring.length - 1][1]) {
        ring = ring.slice(0, ring.length - 1);
    }
    for (var i = 0, j = ring.length - 1; i < ring.length; j = i++) {
        var xi = ring[i][0];
        var yi = ring[i][1];
        var xj = ring[j][0];
        var yj = ring[j][1];
        var onBoundary = pt[1] * (xi - xj) + yi * (xj - pt[0]) + yj * (pt[0] - xi) === 0 &&
            (xi - pt[0]) * (xj - pt[0]) <= 0 &&
            (yi - pt[1]) * (yj - pt[1]) <= 0;
        if (onBoundary) {
            return !ignoreBoundary;
        }
        var intersect = yi > pt[1] !== yj > pt[1] &&
            pt[0] < ((xj - xi) * (pt[1] - yi)) / (yj - yi) + xi;
        if (intersect) {
            isInside = !isInside;
        }
    }
    return isInside;
}
/**
 * inBBox
 *
 * @private
 * @param {Position} pt point [x,y]
 * @param {BBox} bbox BBox [west, south, east, north]
 * @returns {boolean} true/false if point is inside BBox
 */
function inBBox(pt, bbox) {
    return (bbox[0] <= pt[0] && bbox[1] <= pt[1] && bbox[2] >= pt[0] && bbox[3] >= pt[1]);
}