328 lines
11 KiB
JavaScript
328 lines
11 KiB
JavaScript
import { GeoGraphics, GeoShape, GeoMultiShape, GeoLine, GeoPoint } from './geographics.js'
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/**
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* Helper class for handling GeoJson data.
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* As specified by [RFC7946](https://tools.ietf.org/html/rfc7946).
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*
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* @static
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* @export
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* @class
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*/
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export default class GeoJson {
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static isLineType(type) {
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return type == 'LineString' || type == 'MultiLineString'
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}
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static _getFormatStringOfType(type) {
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let description = ', where p represents a coordinate point'
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let format = ''
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switch (type) {
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case 'Point':
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format = 'p'
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break
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case 'LineString':
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format = '[p1,p2,p3,...,pn]'
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break
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case 'Polygon':
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format = '[ [p1,p2,...,pn], [h1,h2,...,hn] ]'
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description += ' and h also represents a coordinate point, but it creates a hole.'
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break
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default:
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format = type
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description = " is either not valid or not yet implemented in method '_getFormatStringOfType(type)'."
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}
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return format + ' - ' + description
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}
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static get types() {
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return ['Point', 'LineString', 'Polygon', 'MultiPoint', 'MultiLineString', 'MultiPolygon']
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}
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static unwrapFeatureCollection(featureCollection) {
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if (featureCollection.features == null) {
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console.error(
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'Error at GeoJson.unrwapFeatureCollection(collection): Provided object was no valid FeatureCollection.',
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featureCollection
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)
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return
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}
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let list = []
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featureCollection.features.forEach(feature => {
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let { type, coordinates } = feature
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if (feature.type.toLowerCase() == 'feature') {
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;({ type, coordinates } = feature.geometry)
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}
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list.push({ type, coordinates })
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})
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return list
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}
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static validateAndConvert(type, coordinates) {
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if (!GeoJson.validateType(type)) throw new GeoJson.InvalidTypeError(type)
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else {
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if (GeoJson.validateCoordinates(type, coordinates)) {
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let converted = GeoJson.convert(type, coordinates)
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return converted
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} else {
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console.error(
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`Coordinates are invalid. They must be in format of type '${type} - ${GeoJson._getFormatStringOfType(
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type
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)}'`
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)
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}
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}
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}
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static validateType(type) {
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return GeoJson.types.indexOf(type) != -1
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}
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static validateCoordinates(type, coordinates) {
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let valid = false
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switch (type) {
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case 'Point':
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valid = !!GeoJson.validateAndConvertPoint(coordinates)
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break
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case 'LineString':
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valid = GeoJson.validateLineString(coordinates)
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break
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case 'Polygon':
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valid = GeoJson.validatePolygon(coordinates)
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break
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case 'MultiPolygon':
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valid = true
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for (let i = 0; i < coordinates.length; i++) {
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if (!GeoJson.validatePolygon(coordinates[i])) {
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valid = false
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break
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}
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}
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break
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case 'MultiPoint':
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case 'MultiLineString':
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default:
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console.error('Type was not yet implemented: ', type)
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}
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return valid
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}
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/**
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* Validates a point if it's an valid coordinate.
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*
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* NOTE: Here we are not following the GeoJSON standard.
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* For convenience multiple forms of representing a coordinate are
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* considered valid. A complete list is provided in the GeoUtils.
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*
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* @param {object} point - The point that is tested for validity.
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* @returns {boolean}
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* @memberof GeoJson
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*/
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static validateAndConvertPoint(point) {
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return GeoUtils.validateCoordinate(point)
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}
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/**
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*Validates if the given points represent a 'LineString'.
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*
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* @param {array} points - A list of coordinates that represent a line.
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* @returns {boolean} - Returns true, if the array is in formes as: [x1,x2,x3,...,xn]. Where x# represent a valid coordinate.
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* @memberof GeoJson
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*/
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static validateLineString(points) {
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let valid = false
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if (Array.isArray(points)) valid = points.every(GeoJson.validateAndConvertPoint)
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return valid
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}
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static validatePolygon(points) {
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let valid = false
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if ((Array.isArray(points) && points.length >= 1) || points.length <= 2)
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valid = points.every(this.validateLineString)
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return valid
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}
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static convert(type, coordinates) {
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let converted = null
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switch (type) {
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case 'Point':
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converted = GeoJson.validateAndConvertPoint(coordinates)
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break
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case 'LineString':
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converted = GeoJson._convertLineString(coordinates)
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break
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case 'Polygon':
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converted = GeoJson._convertPolygon(coordinates)
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break
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case 'MultiPolygon':
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converted = GeoJson._convertMultiPolygon(coordinates)
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break
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default:
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throw new GeoJson.InvalidTypeError(type)
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}
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return converted
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}
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static _convertLineString(coordinates) {
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return coordinates.map(point => {
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return GeoJson.validateAndConvertPoint(point)
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})
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}
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static _convertPolygon(coordinates) {
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return coordinates.map(shape => {
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return GeoJson._convertLineString(shape)
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})
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}
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static _convertMultiPolygon(coordinates) {
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return coordinates.map(polygon => {
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return GeoJson._convertPolygon(polygon)
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})
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}
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}
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GeoJson.InvalidTypeError = class extends Error {
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constructor(type) {
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super(`The requested Type was not implemented: ${type}.`)
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}
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}
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/**
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* GeoUtils contains a collection of useful functions when working with maps.
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*
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* @static
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*/
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export class GeoUtils {
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static transformToGeoGraphics(list) {
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let geographicsList = []
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list.forEach(item => {
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if (item.type == 'FeatureCollection') {
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item.features.forEach(feature => {
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let { type, coordinates } = feature
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if (type.toLowerCase() == 'feature') ({ type, coordinates } = feature.geometry)
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coordinates = GeoJson.validateAndConvert(type, coordinates)
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let geographics = this.fromGeoJsonToGeoGraphics(type, coordinates)
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if (geographics) geographicsList.push(geographics)
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})
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} else {
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let geo = fromGeoJsonToGeoGraphics(item.type, item.geometry)
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if (geo) geographicsList.push(geo)
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}
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})
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return geographicsList
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}
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static resolveFeatureCollection(collection) {
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if (!collection.features) {
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console.error(
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'Error in GeoUtils.resolveFeatureCollection(colelction): Passed parameter was no feature collection.',
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collection
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)
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return
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}
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let geojson = []
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collection.features.forEach(feature => {
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let { type, coordinates } = feature
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if (feature.type == feature) {
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coordinates = feature.geometry.coordinates
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type = feature.geometry.type
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}
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geojson.push({ type, coordinates })
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})
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return geojson
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}
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/**
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* Creates the appropriate GeoGraphics object from a GeoJson type.
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* The coordinates need to be alread in the appropriate PIXI format.
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* If not already - this can be achieved by calling 'GeoJson.validateAndConvert(type, points)'
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* beforehand.
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*
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* @static
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* @param {string} type - Any of the GeoJson types ('Point', 'LineString', 'Polygon', 'MultiPoint', 'MultiLineString', 'MultiPolygon').
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* @param {array} coordinates - Array of coordinates that fit the type. The positions within these must be in PIXI format: {x:a, y:b}.
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* @returns {GeoGraphics} - Returns a GeoGraphics object. If the conversion fails, it returns null.
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* @memberof GeoGraphics
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*/
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static fromGeoJsonToGeoGraphics(type, coordinates, opts = {}) {
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let geographics = null
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/**
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* TODO: REMOVE
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* Just for initial debugging purposes
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*/
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Object.assign(opts, {
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debug: true
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})
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switch (type) {
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case 'Polygon':
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geographics = new GeoShape(coordinates, opts)
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break
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case 'MultiPolygon':
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geographics = new GeoMultiShape(coordinates, opts)
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break
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case 'LineString':
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geographics = new GeoLine(coordinates, opts)
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break
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case 'Point':
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geographics = new GeoPoint(coordinates, opts)
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break
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default:
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console.log('Could not create Geographics for type: ' + type + '. This was not implemented yet.')
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//Nothing
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}
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return geographics
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}
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/**
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* Validates an object, if it's an coordinate object.
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* Coordinate objects can be in the following forms:
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*
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* [lng, lat] - GeoJSON array format. !Attention lng and lat are swapped compared to the x,y format.
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* {x: lat, y: lng} - 'correct' PIXI.format
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* {lat, lng}
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* {latitude: lat, longitude: lng}
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*
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* @static
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* @param {object|array} coordinate - Coordinate to be tested, if it is an valid coordinate.
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* @returns - Returns the coordinate properly transformed. If transformation was not possible, it returns null.
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* @memberof GeoGraphics
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*/
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static validateCoordinate(coordinate) {
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if (Array.isArray(coordinate)) {
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if (coordinate.length == 2 && typeof coordinate[0] == 'number' && typeof coordinate[1] == 'number')
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return new PIXI.Point(coordinate[1], coordinate[0])
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else return false
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} else {
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const latvalues = ['x', 'lat', 'latitude']
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const lngvalues = ['y', 'lng', 'longitude']
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let result = {}
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for (let key of Object.keys(coordinate)) {
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let target = key.toLowerCase()
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if (latvalues.indexOf(target) !== -1) result.x = coordinate[key]
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else if (lngvalues.indexOf(target) !== -1) result.y = coordinate[key]
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}
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if (result.hasOwnProperty('x') && result.hasOwnProperty('y')) return new PIXI.Point(result.x, result.y)
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else return false
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}
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}
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}
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