EliteDangerousRegionMap/RegionMap.js at master · klightspeed/EliteDangerousRegionMap · GitHub

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'use strict';

const crossfetch = require('cross-fetch');
const regionmapdata = require('./RegionMapData.json');
const regions = regionmapdata.regions;
const regionmap = regionmapdata.regionmap;

const x0 = -49985;
const y0 = -40985;
const z0 = -24105;

function findRegion(x, y, z){
    let px = Math.floor((x - x0) * 83 / 4096);
    let pz = Math.floor((z - z0) * 83 / 4096);

    if (px < 0 || pz < 0 || pz > regionmap.length){
        return null;
    } else {
        let row = regionmap[pz];
        let rx = 0;
        let pv = 0;

        for (var v of row) {
            let rl = v[0];
            if (px < rx + rl){
                pv = v[1];
                break;
            } else {
                rx += rl;
            }
        }

        if (pv == 0){
            return { id: 0, name: null };
        } else {
            return { id: pv, name: regions[pv] };
        }
    }
}

function findRegionForBoxel(id64){
    let masscode = id64 & 7;

    let xdiv = 1 << (30 - masscode * 2);
    let ydiv = 1 << (17 - masscode)
    let zdiv = 1 << 3

    let x = ((Math.floor(id64 / xdiv) & (0x3FFF >> masscode)) << masscode) * 10 + x0;
    let y = ((Math.floor(id64 / ydiv) & (0x1FFF >> masscode)) << masscode) * 10 + y0;
    let z = ((Math.floor(id64 / zdiv) & (0x3FFF >> masscode)) << masscode) * 10 + z0;

    return {
        x: x,
        y: y,
        z: z,
        region: findRegion(x, y, z)
    }
}

async function findRegionsForSystems(sysname){
    const response = await crossfetch.fetch('https://www.edsm.net/api-v1/systems?systemName=' + encodeURIComponent(sysname) + '&coords=1&showId=1');
    const systems = await response.json();
    return systems.map(system => {
        let systemdata = {
            name: system.name,
            id64: system.id64
        };

        if (system.coords) {
            let x = systemdata.x = system.coords.x;
            let y = systemdata.y = system.coords.y;
            let z = systemdata.z = system.coords.z;

            systemdata.region = findRegion(x, y, z);
        }

        if (system.id64) {
            system.boxel = findRegionForBoxel(system.id64);
        }

        return systemdata;
    });
}

async function main(args){
    if (args.length == 0) {
        console.log("Usage: " + process.argv[0] + " " + process.argv[1] + " \"System Name\" [..]");
        return;
    }

    for (var sysname of args){
        for (var sysdata of await findRegionsForSystems(sysname)){
            let region = { id: 0, name: null };

            if (sysdata.region !== undefined){
                region = sysdata.region;
                let x = sysdata.x;
                let y = sysdata.y;
                let z = sysdata.z;

                if (region.id != 0){
                    console.log("System %s at (%f,%f,%f) is in region %d (%s)", sysdata.name, x, y, z, region.id, region.name);
                } else {
                    console.log("System %s at (%f,%f,%f) is outside the region map", sysdata.name, x, y, z);
                }
            }

            if (sysdata.boxel !== undefined && sysdata.boxel.region.id != region.id){
                let boxel = sysdata.boxel;
                let boxelregion = boxel.region;
                let x = boxel.x;
                let y = boxel.y;
                let z = boxel.z;

                if (boxelregion.id != 0){
                    console.log("Boxel of system %s at (%f,%f,%f) is in region %d (%s)", sysdata.name, x, y, z, boxelregion.id, boxelregion.name);
                } else {
                    console.log("Boxel of system %s at (%f,%f,%f) is outside the region map", sysdata.name, x, y, z);
                }
            }
        }
    }
}

module.exports.findRegion = findRegion;
module.exports.findRegionForBoxel = findRegionForBoxel;
module.exports.findRegionsForSystems = findRegionsForSystems;

if (require.main == module){
    main(process.argv.slice(2));
}