TypeScript line-segment.default函數代碼示例

/**
 * Takes any LineString or Polygon GeoJSON and returns the intersecting point(s).
 *
 * @name lineIntersect
 * @param {GeoJSON} line1 any LineString or Polygon
 * @param {GeoJSON} line2 any LineString or Polygon
 * @returns {FeatureCollection<Point>} point(s) that intersect both
 * @example
 * var line1 = turf.lineString([[126, -11], [129, -21]]);
 * var line2 = turf.lineString([[123, -18], [131, -14]]);
 * var intersects = turf.lineIntersect(line1, line2);
 *
 * //addToMap
 * var addToMap = [line1, line2, intersects]
 */
function lineIntersect<
    G1 extends LineString|MultiLineString|Polygon|MultiPolygon,
    G2 extends LineString|MultiLineString|Polygon|MultiPolygon
>(
    line1: FeatureCollection<G1> | Feature<G1> | G1,
    line2: FeatureCollection<G2> | Feature<G2> | G2,
): FeatureCollection<Point> {
    const unique: any = {};
    const results: any[] = [];

    // First, normalize geometries to features
    // Then, handle simple 2-vertex segments
    if (line1.type === "LineString") { line1 = feature(line1); }
    if (line2.type === "LineString") { line2 = feature(line2); }
    if (line1.type === "Feature" &&
        line2.type === "Feature" &&
        line1.geometry !== null &&
        line2.geometry !== null &&
        line1.geometry.type === "LineString" &&
        line2.geometry.type === "LineString" &&
        line1.geometry.coordinates.length === 2 &&
        line2.geometry.coordinates.length === 2) {
        const intersect = intersects(line1, line2);
        if (intersect) { results.push(intersect); }
        return featureCollection(results);
    }

    // Handles complex GeoJSON Geometries
    const tree = rbush();
    tree.load(lineSegment(line2));
    featureEach(lineSegment(line1), (segment) => {
        featureEach(tree.search(segment), (match) => {
            const intersect = intersects(segment, match);
            if (intersect) {
                // prevent duplicate points https://github.com/Turfjs/turf/issues/688
                const key = getCoords(intersect).join(",");
                if (!unique[key]) {
                    unique[key] = true;
                    results.push(intersect);
                }
            }
        });
    });
    return featureCollection(results);
}

/**
 * Boolean-Parallel returns True if each segment of `line1` is parallel to the correspondent segment of `line2`
 *
 * @name booleanParallel
 * @param {Geometry|Feature<LineString>} line1 GeoJSON Feature or Geometry
 * @param {Geometry|Feature<LineString>} line2 GeoJSON Feature or Geometry
 * @returns {boolean} true/false if the lines are parallel
 * @example
 * var line1 = turf.lineString([[0, 0], [0, 1]]);
 * var line2 = turf.lineString([[1, 0], [1, 1]]);
 *
 * turf.booleanParallel(line1, line2);
 * //=true
 */
function booleanParallel(line1: Feature<LineString> | LineString, line2: Feature<LineString> | LineString): boolean {
    // validation
    if (!line1) throw new Error('line1 is required');
    if (!line2) throw new Error('line2 is required');
    var type1 = getType(line1, 'line1');
    if (type1 !== 'LineString') throw new Error('line1 must be a LineString');
    var type2 = getType(line2, 'line2');
    if (type2 !== 'LineString') throw new Error('line2 must be a LineString');

    var segments1 = lineSegment(cleanCoords(line1)).features;
    var segments2 = lineSegment(cleanCoords(line2)).features;

    for (var i = 0; i < segments1.length; i++) {
        var segment1 = segments1[i].geometry.coordinates;
        if (!segments2[i]) break;
        var segment2 = segments2[i].geometry.coordinates;
        if (!isParallel(segment1, segment2)) return false;
    }
    return true;
}

/**
 * Takes any LineString or Polygon GeoJSON and returns the intersecting point(s).
 *
 * @name lineIntersect
 * @param {Geometry|FeatureCollection|Feature<LineString|MultiLineString|Polygon|MultiPolygon>} line1 any LineString or Polygon
 * @param {Geometry|FeatureCollection|Feature<LineString|MultiLineString|Polygon|MultiPolygon>} line2 any LineString or Polygon
 * @returns {FeatureCollection<Point>} point(s) that intersect both
 * @example
 * var line1 = turf.lineString([[126, -11], [129, -21]]);
 * var line2 = turf.lineString([[123, -18], [131, -14]]);
 * var intersects = turf.lineIntersect(line1, line2);
 *
 * //addToMap
 * var addToMap = [line1, line2, intersects]
 */
function lineIntersect<G1 extends LineString|MultiLineString|Polygon|MultiPolygon, G2 extends LineString|MultiLineString|Polygon|MultiPolygon>(
    line1: FeatureCollection<G1> | Feature<G1> | G1,
    line2: FeatureCollection<G2> | Feature<G2> | G2,
): FeatureCollection<Point> {
    var unique = {};
    var results = [];

    // First, normalize geometries to features
    // Then, handle simple 2-vertex segments
    if (line1.type === 'LineString') line1 = feature(line1);
    if (line2.type === 'LineString') line2 = feature(line2);
    if (line1.type === 'Feature' &&
        line2.type === 'Feature' &&
        line1.geometry.type === 'LineString' &&
        line2.geometry.type === 'LineString' &&
        line1.geometry.coordinates.length === 2 &&
        line2.geometry.coordinates.length === 2) {
        var intersect = intersects(line1, line2);
        if (intersect) results.push(intersect);
        return featureCollection(results);
    }

    // Handles complex GeoJSON Geometries
    var tree = rbush();
    tree.load(lineSegment(line2));
    featureEach(lineSegment(line1), function (segment) {
        featureEach(tree.search(segment), function (match) {
            var intersect = intersects(segment, match);
            if (intersect) {
                // prevent duplicate points https://github.com/Turfjs/turf/issues/688
                var key = getCoords(intersect).join(',');
                if (!unique[key]) {
                    unique[key] = true;
                    results.push(intersect);
                }
            }
        });
    });
    return featureCollection(results);
}