iTowns / itowns / 12395220482

import proj4 from 'proj4';

import LASParser from 'Parser/LASParser';

import PotreeBinParser from 'Parser/PotreeBinParser';

import Fetcher from 'Provider/Fetcher';

import Source from 'Source/Source';

/**

 * 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).

 *

 * @extends Source

 *

 * @property {boolean} isEntwinePointTileSource - Used to checkout whether this

 * source is a EntwinePointTileSource. Default is true. You should not change

 * this, as it is used internally for optimisation.

 * @property {string} url - The URL of the directory containing the whole

 * Entwine Point Tile structure.

 */

class EntwinePointTileSource extends Source {

    /**

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

     * available values.

     * @param {number|string} [config.colorDepth='auto'] - Does the color

     * encoding is known ? Is it `8` or `16` bits ? By default it is to

     * `'auto'`, but it will be more performant if a specific value is set.

     */

    constructor(config) {

        super(config);

        this.isEntwinePointTileSource = true;

        this.colorDepth = config.colorDepth;

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

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

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

        this.whenReady = Fetcher.json(`${this.url}/ept.json`, this.networkOptions).then((metadata) => {

            // 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) {

                    proj4.defs('unknown', metadata.srs.wkt);

                    const projCS = proj4.defs('unknown');

                    this.crs = projCS.title || projCS.name;

                    if (!(this.crs in proj4.defs)) {

                        proj4.defs(this.crs, projCS);

                    }

                }

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

                    console.warn('EntwinePointTileSource: Vertical coordinates system code is not yet supported.');

                }

            }

            // 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(metadata.boundsConforming[3] - metadata.boundsConforming[0])

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

            this.boundsConforming = metadata.boundsConforming;

            this.bounds = metadata.bounds;

            this.span = metadata.span;

            return this;

        });

        this.fetcher = Fetcher.arrayBuffer;

    }

}

export default EntwinePointTileSource;