TypeScript invariant.getCoords函數代碼示例

        featureEach(tree.search(segment), function (match) {
            if (doesOverlaps === false) {
                var coordsSegment = getCoords(segment).sort();
                var coordsMatch: any = getCoords(match).sort();

                // Segment overlaps feature
                if (equal(coordsSegment, coordsMatch)) {
                    doesOverlaps = true;
                    // Overlaps already exists - only append last coordinate of segment
                    if (overlapSegment) overlapSegment = concatSegment(overlapSegment, segment);
                    else overlapSegment = segment;
                // Match segments which don't share nodes (Issue #901)
                } else if (
                    (tolerance === 0) ?
                        booleanPointOnLine(coordsSegment[0], match) && booleanPointOnLine(coordsSegment[1], match) :
                        nearestPointOnLine(match, coordsSegment[0]).properties.dist <= tolerance &&
                        nearestPointOnLine(match, coordsSegment[1]).properties.dist <= tolerance) {
                    doesOverlaps = true;
                    if (overlapSegment) overlapSegment = concatSegment(overlapSegment, segment);
                    else overlapSegment = segment;
                } else if (
                    (tolerance === 0) ?
                        booleanPointOnLine(coordsMatch[0], segment) && booleanPointOnLine(coordsMatch[1], segment) :
                        nearestPointOnLine(segment, coordsMatch[0]).properties.dist <= tolerance &&
                        nearestPointOnLine(segment, coordsMatch[1]).properties.dist <= tolerance) {
                    // Do not define (doesOverlap = true) since more matches can occur within the same segment
                    // doesOverlaps = true;
                    if (overlapSegment) overlapSegment = concatSegment(overlapSegment, match);
                    else overlapSegment = match;
                }
            }
        });

/**
 * Boolean-contains returns True if the second geometry is completely contained by the first geometry.
 * The interiors of both geometries must intersect and, the interior and boundary of the secondary (geometry b)
 * must not intersect the exterior of the primary (geometry a).
 * Boolean-contains returns the exact opposite result of the `@turf/boolean-within`.
 *
 * @name booleanContains
 * @param {Geometry|Feature<any>} feature1 GeoJSON Feature or Geometry
 * @param {Geometry|Feature<any>} feature2 GeoJSON Feature or Geometry
 * @returns {boolean} true/false
 * @example
 * var line = turf.lineString([[1, 1], [1, 2], [1, 3], [1, 4]]);
 * var point = turf.point([1, 2]);
 *
 * turf.booleanContains(line, point);
 * //=true
 */
export default function booleanContains(feature1: Feature<any> | Geometry, feature2: Feature<any> | Geometry) {
    const geom1 = getGeom(feature1);
    const geom2 = getGeom(feature2);
    const type1 = getType(feature1);
    const type2 = getType(feature2);
    const coords1 = getCoords(feature1);
    const coords2 = getCoords(feature2);

    switch (type1) {
    case 'Point':
        switch (type2) {
        case 'Point':
            return compareCoords(coords1, coords2);
        default:
            throw new Error('feature2 ' + type2 + ' geometry not supported');
        }
    case 'MultiPoint':
        switch (type2) {
        case 'Point':
            return isPointInMultiPoint(geom1, geom2);
        case 'MultiPoint':
            return isMultiPointInMultiPoint(geom1, geom2);
        default:
            throw new Error('feature2 ' + type2 + ' geometry not supported');
        }
    case 'LineString':
        switch (type2) {
        case 'Point':
            return isPointOnLine(geom2, geom1, {ignoreEndVertices: true});
        case 'LineString':
            return isLineOnLine(geom1, geom2);
        case 'MultiPoint':
            return isMultiPointOnLine(geom1, geom2);
        default:
            throw new Error('feature2 ' + type2 + ' geometry not supported');
        }
    case 'Polygon':
        switch (type2) {
        case 'Point':
            return booleanPointInPolygon(geom2, geom1, {ignoreBoundary: true});
        case 'LineString':
            return isLineInPoly(geom1, geom2);
        case 'Polygon':
            return isPolyInPoly(geom1, geom2);
        case 'MultiPoint':
            return isMultiPointInPoly(geom1, geom2);
        default:
            throw new Error('feature2 ' + type2 + ' geometry not supported');
        }
    default:
        throw new Error('feature1 ' + type1 + ' geometry not supported');
    }
}

/**
 * Concat Segment
 *
 * @private
 * @param {Feature<LineString>} line LineString
 * @param {Feature<LineString>} segment 2-vertex LineString
 * @returns {Feature<LineString>} concat linestring
 */
function concatSegment(line, segment) {
    var coords = getCoords(segment);
    var lineCoords = getCoords(line);
    var start = lineCoords[0];
    var end = lineCoords[lineCoords.length - 1];
    var geom = line.geometry.coordinates;

    if (equal(coords[0], start)) geom.unshift(coords[1]);
    else if (equal(coords[0], end)) geom.push(coords[1]);
    else if (equal(coords[1], start)) geom.unshift(coords[0]);
    else if (equal(coords[1], end)) geom.push(coords[0]);
    return line;
}

/**
 * Clean Coords
 *
 * @private
 * @param {Array<number>|LineString} line Line
 * @returns {Array<number>} Cleaned coordinates
 */
function cleanLine(line) {

    var points = getCoords(line);
    // handle "clean" segment
    if (points.length === 2 && !equals(points[0], points[1])) return points;

    var newPoints = [];
    var secondToLast = points.length - 1;
    var newPointsLength = newPoints.length;

    newPoints.push(points[0]);
    for (var i = 1; i < secondToLast; i++) {
        var prevAddedPoint = newPoints[newPoints.length - 1];
        if ((points[i][0] === prevAddedPoint[0]) && (points[i][1] === prevAddedPoint[1])) continue;
        else {
            newPoints.push(points[i]);
            newPointsLength = newPoints.length;
            if (newPointsLength > 2) {
                if (isPointOnLineSegment(newPoints[newPointsLength - 3], newPoints[newPointsLength - 1], newPoints[newPointsLength - 2])) newPoints.splice(newPoints.length - 2, 1);
            }
        }
    }
    newPoints.push(points[points.length - 1]);

    newPointsLength = newPoints.length;
    if (equals(points[0], points[points.length - 1]) && newPointsLength < 4) throw new Error('invalid polygon');
    if (isPointOnLineSegment(newPoints[newPointsLength - 3], newPoints[newPointsLength - 1], newPoints[newPointsLength - 2])) newPoints.splice(newPoints.length - 2, 1);

    return newPoints;
}

/**
 * Line Segment
 *
 * @private
 * @param {Feature<LineString|Polygon>} geojson Line or polygon feature
 * @param {Array} results push to results
 * @returns {void}
 */
function lineSegmentFeature(geojson, results) {
    var coords = [];
    var geometry = geojson.geometry;
    switch (geometry.type) {
    case 'Polygon':
        coords = getCoords(geometry);
        break;
    case 'LineString':
        coords = [getCoords(geometry)];
    }
    coords.forEach(function (coord) {
        var segments = createSegments(coord, geojson.properties);
        segments.forEach(function (segment) {
            segment.id = results.length;
            results.push(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);
         }
     }
 });

/**
 * Line Segment
 *
 * @private
 * @param {Feature<LineString|Polygon>} geojson Line or polygon feature
 * @param {Array} results push to results
 * @returns {void}
 */
function lineSegmentFeature(geojson: Feature<LineString|Polygon>, results: Array<Feature<LineString>>) {
    let coords: number[][][] = [];
    const geometry = geojson.geometry;
    if (geometry !== null) {
        switch (geometry.type) {
        case "Polygon":
            coords = getCoords(geometry);
            break;
        case "LineString":
            coords = [getCoords(geometry)];
        }
        coords.forEach((coord) => {
            const segments = createSegments(coord, geojson.properties);
            segments.forEach((segment) => {
                segment.id = results.length;
                results.push(segment);
            });
        });
    }
}

/**
 * Find a point that intersects LineStrings with two coordinates each
 *
 * @private
 * @param {Feature<LineString>} line1 GeoJSON LineString (Must only contain 2 coordinates)
 * @param {Feature<LineString>} line2 GeoJSON LineString (Must only contain 2 coordinates)
 * @returns {Feature<Point>} intersecting GeoJSON Point
 */
function intersects(line1, line2) {
    var coords1 = getCoords(line1);
    var coords2 = getCoords(line2);
    if (coords1.length !== 2) {
        throw new Error('<intersects> line1 must only contain 2 coordinates');
    }
    if (coords2.length !== 2) {
        throw new Error('<intersects> line2 must only contain 2 coordinates');
    }
    var x1 = coords1[0][0];
    var y1 = coords1[0][1];
    var x2 = coords1[1][0];
    var y2 = coords1[1][1];
    var x3 = coords2[0][0];
    var y3 = coords2[0][1];
    var x4 = coords2[1][0];
    var y4 = coords2[1][1];
    var denom = ((y4 - y3) * (x2 - x1)) - ((x4 - x3) * (y2 - y1));
    var numeA = ((x4 - x3) * (y1 - y3)) - ((y4 - y3) * (x1 - x3));
    var numeB = ((x2 - x1) * (y1 - y3)) - ((y2 - y1) * (x1 - x3));

    if (denom === 0) {
        if (numeA === 0 && numeB === 0) {
            return null;
        }
        return null;
    }

    var uA = numeA / denom;
    var uB = numeB / denom;

    if (uA >= 0 && uA <= 1 && uB >= 0 && uB <= 1) {
        var x = x1 + (uA * (x2 - x1));
        var y = y1 + (uA * (y2 - y1));
        return point([x, y]);
    }
    return null;
}

/**
 * Find a point that intersects LineStrings with two coordinates each
 *
 * @private
 * @param {Feature<LineString>} line1 GeoJSON LineString (Must only contain 2 coordinates)
 * @param {Feature<LineString>} line2 GeoJSON LineString (Must only contain 2 coordinates)
 * @returns {Feature<Point>} intersecting GeoJSON Point
 */
function intersects(line1: Feature<any>, line2: Feature<any>) {
    const coords1: any = getCoords(line1);
    const coords2: any = getCoords(line2);
    if (coords1.length !== 2) {
        throw new Error("<intersects> line1 must only contain 2 coordinates");
    }
    if (coords2.length !== 2) {
        throw new Error("<intersects> line2 must only contain 2 coordinates");
    }
    const x1 = coords1[0][0];
    const y1 = coords1[0][1];
    const x2 = coords1[1][0];
    const y2 = coords1[1][1];
    const x3 = coords2[0][0];
    const y3 = coords2[0][1];
    const x4 = coords2[1][0];
    const y4 = coords2[1][1];
    const denom = ((y4 - y3) * (x2 - x1)) - ((x4 - x3) * (y2 - y1));
    const numeA = ((x4 - x3) * (y1 - y3)) - ((y4 - y3) * (x1 - x3));
    const numeB = ((x2 - x1) * (y1 - y3)) - ((y2 - y1) * (x1 - x3));

    if (denom === 0) {
        if (numeA === 0 && numeB === 0) {
            return null;
        }
        return null;
    }

    const uA = numeA / denom;
    const uB = numeB / denom;

    if (uA >= 0 && uA <= 1 && uB >= 0 && uB <= 1) {
        const x = x1 + (uA * (x2 - x1));
        const y = y1 + (uA * (y2 - y1));
        return point([x, y]);
    }
    return null;
}