iTowns / itowns / 21704984010

import { CRS } from '@itowns/geographic';

import LASParser from 'Parser/LASParser';

import PotreeBinParser from 'Parser/PotreeBinParser';

import Fetcher from 'Provider/Fetcher';

import Source from 'Source/Source';

/**

 * @param colorDepth - Color depth (in bits).

 * Either 8 or 16 bits. By defaults it will be set to 8 bits for LAS 1.2 and

 * 16 bits for later versions (as mandatory by the specification).

 */

interface EntwinePointTileSourceParameters {

    /** he URL of the directory containing the whole

     * Entwine Point Tile structure. */

    url: string;

    crs: string;

    colorDepth: number;

    networkOptions?: RequestInit;

}

interface EntwinePointTileMetadata {

    bounds: [number, number, number, number, number, number];

    boundsConforming: [number, number, number, number, number, number];

    span: number;

    dataType: 'laszip' | 'bin';

    srs: {

        authority?: string;

        horizontal?: string;

        vertical?: string;

        wkt: string;

    };

}

/**

 * An object defining the source of Entwine Point Tile data. It fetches and

 * parses the main configuration file of Entwine Point Tile format,

 * [`ept.json`](https://entwine.io/entwine-point-tile.html#ept-json).

 */

class EntwinePointTileSource extends Source {

    /** Used to checkout whether this source is a EntwinePointTileSource.

     * Default is true. You should not change this,

     * as it is used internally for optimisation. */

    readonly isEntwinePointTileSource: true;

    colorDepth: number;

    // Properties initialized after fetching ept.json file

    boundsConforming!: [number, number, number, number, number, number];

    bounds!: [number, number, number, number, number, number];

    span!: number;

    zmin!: number;

    zmax!: number;

    spacing!: number;

    extension!: 'laz' | 'bin';

    /**

     * @param config - The configuration, see {@link Source} for

     * available values.

     */

    constructor(config: EntwinePointTileSourceParameters) {

        super(config);

        this.isEntwinePointTileSource = true;

        this.colorDepth = config.colorDepth;

        this.fetcher = Fetcher.arrayBuffer;

        // Necessary because we use the url without the ept.json part as a base

        this.url = this.url.replace('/ept.json', '');

        const jsonPromise = Fetcher

            .json(`${this.url}/ept.json`, this.networkOptions) as Promise<EntwinePointTileMetadata>;

        // https://entwine.io/entwine-point-tile.html#ept-json

        this.whenReady = jsonPromise.then((metadata) => {

            this.boundsConforming = metadata.boundsConforming;

            this.bounds = metadata.bounds;// xMin, yMin, zMin, xMax, yMax, zMax

            this.span = metadata.span;

            this.zmin = this.boundsConforming[2];

            this.zmax = this.boundsConforming[5];

            // NOTE: this spacing is kinda arbitrary here, we take the width and

            // length (height can be ignored), and we divide by the specified

            // span in ept.json. This needs improvements.

            this.spacing = (Math.abs(this.bounds[3] - this.bounds[0])

                + Math.abs(this.bounds[4] - this.bounds[1])) / (2 * this.span);

            // Set parser and its configuration from schema

            if (metadata.srs) {

                if (metadata.srs.authority && metadata.srs.horizontal) {

                    this.crs = `${metadata.srs.authority}:${metadata.srs.horizontal}`;

                } else if (metadata.srs.wkt) {

                    this.crs = CRS.defsFromWkt(metadata.srs.wkt);

                }

                if (metadata.srs.vertical && metadata.srs.vertical !== metadata.srs.horizontal) {

                    console.warn('EntwinePointTileSource:' +

                        'Vertical coordinates system code is not yet supported.');

                }

            }

            return this;

        });

    }

}

export default EntwinePointTileSource;