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- var zlib = require('zlib');
- var express = require('express');
- var mapnik = require('mapnik');
- var Promise = require('promise');
- var SphericalMercator = require('sphericalmercator');
- var mercator = new SphericalMercator({
- size: 256 //tile size
- });
- mapnik.register_default_input_plugins();
- var app = express();
- app.get('/:namelayer/:z/:x/:y.pbf', (req, res, next) => {
- var options = {
- x: parseInt(req.params.x),
- y: parseInt(req.params.y),
- z: parseInt(req.params.z),
- layerName: req.params.namelayer
- };
- makeVectorTile(options).then( (vectorTile) => {
- zlib.deflate(vectorTile, (err, data) => {
- if (err) {
- return res.status(500).send(err.message);
- }
- res.setHeader('Content-Encoding', 'deflate');
- res.setHeader('Content-Type', 'application/x-protobuf');
- return res.send(data);
- });
- });
- });
- function makeVectorTile(options) {
- var extent = mercator.bbox(options.x, options.y, options.z, false, '3857');
- var map = new mapnik.Map(256, 256, '+init=epsg:3857');
- map.extent = extent;
- var layer = new mapnik.Layer(options.layerName);
- layer.datasource = new mapnik.Datasource({
- type: process.env.DB_TYPE,
- dbname: process.env.DB_DATABASE,
- table: options.layerName,
- user: process.env.DB_USER,
- password: process.env.DB_PASSWORD
- });
- layer.styles = ['default'];
- map.add_layer(layer);
- return new Promise( (resolve, reject) => {
- var vtile = new mapnik.VectorTile(parseInt(options.z), parseInt(options.x), parseInt(options.y));
- map.render(vtile, function (err, vtile) {
- if (err) {
- console.log('Error: ', err)
- return reject(err);
- }
- console.log(`${vtile.getData().length} KB`);
- resolve(vtile.getData());
- });
- });
- };
- module.exports = app;
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