TypeScript helpers.multiLineString函數代碼示例

/**
 * Takes a {@link Feature} and a bbox and clips the feature to the bbox using
 * [lineclip](https://github.com/mapbox/lineclip).
 * May result in degenerate edges when clipping Polygons.
 *
 * @name bboxClip
 * @param {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} feature feature to clip to the bbox
 * @param {BBox} bbox extent in [minX, minY, maxX, maxY] order
 * @returns {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} clipped Feature
 * @example
 * var bbox = [0, 0, 10, 10];
 * var poly = turf.polygon([[[2, 2], [8, 4], [12, 8], [3, 7], [2, 2]]]);
 *
 * var clipped = turf.bboxClip(poly, bbox);
 *
 * //addToMap
 * var addToMap = [bbox, poly, clipped]
 */
export default function bboxClip<G extends Polygon | MultiPolygon | LineString | MultiLineString, P = Properties>(
    feature: Feature<G, P> | G,
    bbox: BBox,
) {
    const geom = getGeom(feature);
    const type = geom.type;
    const properties = feature.type === "Feature" ? feature.properties : {};
    let coords: any[] = geom.coordinates;

    switch (type) {
    case "LineString":
    case "MultiLineString":
        const lines: any[] = [];
        if (type === "LineString") { coords = [coords]; }
        coords.forEach((line) => {
            lineclip.polyline(line, bbox, lines);
        });
        if (lines.length === 1) { return lineString(lines[0], properties); }
        return multiLineString(lines, properties);
    case "Polygon":
        return polygon(clipPolygon(coords, bbox), properties);
    case "MultiPolygon":
        return multiPolygon(coords.map((poly) => {
            return clipPolygon(poly, bbox);
        }), properties);
    default:
        throw new Error("geometry " + type + " not supported");
    }
}

export function coordsToLine<P = Properties>(
    coords: number[][][],
    properties: P,
): Feature<LineString | MultiLineString, P> {
    if (coords.length > 1) { return multiLineString(coords, properties); }
    return lineString(coords[0], properties);
}

/**
 * Takes a {@link Feature} and a bbox and clips the feature to the bbox using [lineclip](https://github.com/mapbox/lineclip).
 * May result in degenerate edges when clipping Polygons.
 *
 * @name bboxClip
 * @param {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} feature feature to clip to the bbox
 * @param {BBox} bbox extent in [minX, minY, maxX, maxY] order
 * @returns {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} clipped Feature
 * @example
 * var bbox = [0, 0, 10, 10];
 * var poly = turf.polygon([[[2, 2], [8, 4], [12, 8], [3, 7], [2, 2]]]);
 *
 * var clipped = turf.bboxClip(poly, bbox);
 *
 * //addToMap
 * var addToMap = [bbox, poly, clipped]
 */
function bboxClip<G extends Polygon | MultiPolygon | LineString | MultiLineString, P = Properties>(
    feature: Feature<G, P> | G,
    bbox: BBox
) {
    const geom = getGeom(feature);
    const type = geom.type;
    const properties = feature.type === 'Feature' ? feature.properties : {};
    let coords: any[] = geom.coordinates;

    switch (type) {
    case 'LineString':
    case 'MultiLineString':
        const lines = [];
        if (type === 'LineString') coords = [coords];
        coords.forEach(function (line) {
            lineclip.polyline(line, bbox, lines);
        });
        if (lines.length === 1) return lineString(lines[0], properties);
        return multiLineString(lines, properties);
    case 'Polygon':
        return polygon(clipPolygon(coords, bbox), properties);
    case 'MultiPolygon':
        return multiPolygon(coords.map((polygon) => {
            return clipPolygon(polygon, bbox);
        }), properties);
    default:
        throw new Error('geometry ' + type + ' not supported');
    }
}

/**
 * Merges all connected (non-forking, non-junctioning) line strings into single lineStrings.
 * [LineString] -> LineString|MultiLineString
 *
 * @param {FeatureCollection<LineString|MultiLineString>} geojson Lines to dissolve
 * @param {Object} [options={}] Optional parameters
 * @param {boolean} [options.mutate=false] Prevent input mutation
 * @returns {Feature<LineString|MultiLineString>} Dissolved lines
 */
function lineDissolve(
    geojson: FeatureCollection<LineString|MultiLineString>,
    options: {mutate?: boolean} = {},
): Feature<LineString|MultiLineString> | null {
    // Optional parameters
    options = options || {};
    if (!isObject(options)) { throw new Error("options is invalid"); }
    const mutate = options.mutate;

    // Validation
    if (getType(geojson) !== "FeatureCollection") { throw new Error("geojson must be a FeatureCollection"); }
    if (!geojson.features.length) { throw new Error("geojson is empty"); }

    // Clone geojson to avoid side effects
    if (mutate === false || mutate === undefined) { geojson = clone(geojson); }

    const result: any[] = [];
    const lastLine = lineReduce(geojson, (previousLine: any, currentLine: any) => {
        // Attempt to merge this LineString with the other LineStrings, updating
        // the reference as it is merged with others and grows.
        const merged = mergeLineStrings(previousLine, currentLine);

        // Accumulate the merged LineString
        if (merged) { return merged;
        // Put the unmerged LineString back into the list
        } else {
            result.push(previousLine);
            return currentLine;
        }
    });
    // Append the last line
    if (lastLine) { result.push(lastLine); }

    // Return null if no lines were dissolved
    if (!result.length) {
        return null;
    // Return LineString if only 1 line was dissolved
    } else if (result.length === 1) {
        return result[0];
    // Return MultiLineString if multiple lines were dissolved with gaps
    } else { return multiLineString(result.map((line) => {
        return line.coordinates;
    })); }
}

import {polygon, lineString, multiLineString, multiPolygon} from '@turf/helpers'
import * as rewind from './'

const coords = [[121, -29], [138, -29], [138, -18], [121, -18], [121, -29]]
const poly = polygon([coords])
const line = lineString(coords)
const multiPoly = multiPolygon([[coords], [coords]])
const multiLine = multiLineString([coords, coords])

rewind(line)
rewind(poly)
rewind(multiPoly)
rewind(multiLine)
rewind(poly, true)
rewind(poly, true, true)

import buffer from './'

// Standard Geometry
const pt = point([100, 0]);
const line = lineString([[100, 0], [50, 0]]);
const poly = polygon([[[100, 0], [50, 0], [0, 50], [100, 0]]]);

buffer(pt, 5);
buffer(line, 5);
buffer(poly, 5);
buffer(pt, 5, {units: 'miles'});
buffer(pt, 10, {units: 'meters', steps: 64});

// Multi Geometry
const multiPt = multiPoint([[100, 0], [0, 100]]);
const multiLine = multiLineString([[[100, 0], [50, 0]], [[100, 0], [50, 0]]]);
const multiPoly = multiPolygon([[[[100, 0], [50, 0], [0, 50], [100, 0]]], [[[100, 0], [50, 0], [0, 50], [100, 0]]]]);

buffer(multiPt, 5);
buffer(multiLine, 5);
buffer(multiPoly, 5);

// Collections
const fc = featureCollection<Point|LineString>([pt, line]);
const gc = geometryCollection([pt.geometry, line.geometry]);

buffer(fc, 5);
buffer(gc, 5);

// Mixed Collections
const fcMixed = featureCollection<any>([pt, line, multiPt, multiLine]);

import * as lineOffset from '../'
import {lineString, multiLineString} from '@turf/helpers'

const line = lineString([[0, 0], [10, 10]])
const multiLine = multiLineString([[[0, 0], [10, 10]], [[5, 5], [15, 15]]])

lineOffset(line, 50)
lineOffset(line.geometry, 50)
lineOffset(multiLine, 50)
lineOffset(multiLine.geometry, 50)
lineOffset(line, 50, 'miles')

import {lineString, multiLineString, polygon, multiPolygon} from '@turf/helpers'
import * as lineOverlap from './'

const line = lineString([[0, 0], [10, 10]]);
const multiLine = multiLineString([[[0, 0], [10, 10]], [[30, 30], [50, 50]]]);
const poly = polygon([[[0, 0], [10, 10], [15, 15], [0, 0]]]);
const multiPoly = multiPolygon([
  [[[0, 0], [10, 10], [15, 15], [0, 0]]],
  [[[5, 5], [30, 30], [45, 45], [5, 5]]]
])

lineOverlap(line, poly)
lineOverlap(line, line)
lineOverlap(multiPoly, line)
lineOverlap(multiPoly, multiLine)

    geomReduce,
    geomEach,
    flattenReduce,
    flattenEach,
    segmentReduce,
    segmentEach,
    lineReduce,
    lineEach
} from './'

// Fixtures
const pt = helpers.point([0, 0])
const line = helpers.lineString([[0, 0], [1, 1]])
const poly = helpers.polygon([[[0, 0], [1, 1], [0, 1], [0, 0]]])
const multiPoly = helpers.multiPolygon([[[[0, 0], [1, 1], [0, 1], [0, 0]]]])
const multiLine = helpers.multiLineString([[[0, 0], [1, 1], [0, 1], [0, 0]], [[2, 2], [3, 3]]])
const geomCollection = helpers.geometryCollection([pt.geometry, line.geometry])
const features = helpers.featureCollection([pt, line])

const customPoint = point([10, 20], {foo: 'abc', bar: 123})
const customPoints = featureCollection([customPoint])
const customLineString = lineString([[0, 0], [10, 20]], {foo: 'abc', bar: 123})
const customLineStrings = featureCollection([customLineString])

/**
 * meta.coordEach
 */
const coordEachValue: void = meta.coordEach(pt, coords => coords)
coordEach(pt, (coords, index) => coords)
meta.coordEach(pt, (coords, index) => coords)
meta.coordEach(pt.geometry, coords => { const equal: number[] = coords })

import {multiPoint, multiLineString, geometryCollection} from '@turf/helpers'
import * as flatten from './'

const multiPt = multiPoint([[0, 0], [10, 10]])
const multiLine = multiLineString([[[20, 20], [30, 30]], [[0, 0], [10, 10]]])

flatten(multiPt);
flatten(multiLine);
flatten(multiPt.geometry);
flatten(multiLine.geometry);
flatten(geometryCollection([multiPt.geometry, multiLine.geometry]));