/
app.js
executable file
·66 lines (57 loc) · 1.8 KB
/
app.js
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#!/usr/bin/env node
// This example shows how to use node-mapnik with tilelive.js
// to render serve map tiles to polymaps client
//
// expected output at zoom 0: http://goo.gl/cyGwo
var http = require('http'),
Tile = require('tilelive').Tile,
path = require('path'),
sys = require('sys'),
fs = require('fs'),
util = require('../lib/utility.js'),
usage = 'usage: app.js <stylesheet> <port>\ndemo: app.js ../../stylesheet.xml 8000',
MAPFILE_DIR = '.',
stylesheet = process.ARGV[2],
port = process.ARGV[3];
if (!stylesheet) {
console.log(usage);
process.exit(1);
}
if (!port) {
console.log(usage);
process.exit(1);
}
var language = (path.extname(stylesheet).toLowerCase() == '.mml') ? 'carto' : 'xml';
http.createServer(function(req, res) {
util.parseXYZ(req,function(err,params) {
res.writeHead(500, {
'Content-Type': 'text/plain'
});
if (err) {
res.end(err);
} else {
try {
var tile = new Tile({
type: 'map',
scheme: 'xyz',
datasource: stylesheet,
language: language,
xyz: [params.x, params.y, params.z],
format: 'png',
mapfile_dir: MAPFILE_DIR
});
} catch (err) {
res.end('Tile invalid: ' + err.message + '\n');
}
tile.render(function(err, data) {
if (!err) {
res.writeHead(200, data[1]);
res.end(data[0]);
} else {
res.end('Tile rendering error: ' + err + '\n');
}
});
}
});
}).listen(port);
console.log('Test server listening on port %d', port);