Render a map from a stylesheet:
var mapnik = require('mapnik');
var fs = require('fs');
// register fonts and datasource plugins
mapnik.register_default_fonts();
mapnik.register_default_input_plugins();
var map = new mapnik.Map(256, 256);
map.load('./test/stylesheet.xml', function(err,map) {
if (err) throw err;
map.zoomAll();
var im = new mapnik.Image(256, 256);
map.render(im, function(err,im) {
if (err) throw err;
im.encode('png', function(err,buffer) {
if (err) throw err;
fs.writeFile('map.png',buffer, function(err) {
if (err) throw err;
console.log('saved map image to map.png');
});
});
});
});Convert a jpeg image to a png:
var mapnik = require('mapnik');
new mapnik.Image.open('input.jpg').save('output.png');Convert a shapefile to GeoJSON:
var mapnik = require('mapnik');
mapnik.register_datasource(path.join(mapnik.settings.paths.input_plugins,'shape.input'));
var ds = new mapnik.Datasource({type:'shape',file:'test/data/world_merc.shp'});
var featureset = ds.featureset()
var geojson = {
"type": "FeatureCollection",
"features": [
]
}
var feat = featureset.next();
while (feat) {
geojson.features.push(JSON.parse(feat.toJSON()));
feat = featureset.next();
}
fs.writeFileSync("output.geojson",JSON.stringify(geojson,null,2));For more sample code see the tests and sample code.
Starting from v4.5.0, node-mapnik module is published as "universal" binaries using node-addon-api
All Node.js versions >= 10 are known to work, consult N-API documentation for more details: https://nodejs.org/dist/latest/docs/api/n-api.html#n_api_node_api_version_matrix
An installation error like below indicates your system does not have a modern enough libstdc++/gcc-base toolchain:
Error: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version GLIBCXX_3.4.21 not found (required by /node_modules/mapnik/lib/binding/mapnik.node)
If you are running Ubuntu older than 16.04 you can easily upgrade your libstdc++ version like:
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update -y
sudo apt-get install -y libstdc++-6-dev
To upgrade libstdc++ on travis (without sudo) you can do:
language: cpp
sudo: false
addons:
apt:
sources:
- ubuntu-toolchain-r-test
packages:
- libstdc++-6-dev # upgrade libstdc++Just do:
npm install mapnik
Note: This will install the latest node-mapnik 4.5.x series, which is recommended.
There are two ways to build from source. These work on both OS X and Linux:
- A) Against a binary package from Mapnik from mason
- B) Against an existing version of Mapnik on your system
Using A) is recommended. You do not need to have Mapnik installed already, so this is the easiest and most predictable approach. When you use the route a binary package of Mapnik is downloaded dynamically from mason.
You can invoke this method simply by running:
make release
Or, for debug builds:
make debug
If you want to do a full rebuild do:
make distclean
And then re-run the build:
make release
Using B) is also possible, if you would like to build node-mapnik against an external, already installed Mapnik version.
In this case you need to have a Mapnik version installed that is at least as recent as the mapnik_version property in the package.json for the branch of node-mapnik you want to build.
And you need to have the mapnik-config program is available and on your ${PATH}.
Then run (within the cloned node-mapnik directory:
make release_base
or
make debug_base
for release and debug builds, respectively.
By default node mapnik is built with SSE support. If you are building on a platform that is not x86_64 you will need to disable feature by setting the environment variable SSE_MATH=false.
SSE_MATH=false make
The master branch of node-mapnik is not compatible with 3.0.x series of Mapnik. To build against Mapnik 3.0.x, use v3.0.x branch.
To require node-mapnik as a dependency of another package put in your package.json:
"dependencies" : { "mapnik":"*" } // replace * with a given semver version string
To run the tests do:
npm test
BSD, see LICENSE.txt
React
Typescript
Django
Laravel
Facebook
Microsoft
Google
Alibaba
D3
Tencent