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.
If you hit an error like:
Error: /usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.18' not found
This means your Linux distributions libstdc++ library is too old (for example you are running Ubuntu Precise rather than Trusty). To work around this upgrade libstdc++:
sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
sudo apt-get update -q
sudo apt-get install -y libstdc++6
To upgrade libstdc++ on travis (without sudo) you can do:
language: cpp
sudo: false
addons:
apt:
sources:
- ubuntu-toolchain-r-test
packages:
- libstdc++6 # upgrade libstdc++ on linux to support C++11
Just do:
npm install mapnik@3.x
Note: This will install the latest node-mapnik 3.x series, which is recommended. There is also an 1.x series which maintains API compatibility with Mapnik 2.3.x and 2.2.x and a v0.7.x series which is not recommended unless you need to support Mapnik 2.1 or older.
By default, binaries are provided for:
On those platforms no external dependencies are needed.
Other platforms will fall back to a source compile: see Source Build for details.
Binaries started being provided at node-mapnik >= 1.4.2 for OSX and Linux and at 1.4.8 for Windows.
NOTE: Windows binaries for the 3.x series require the Visual C++ Redistributable Packages for Visual Studio 2015:
See https://github.com/mapnik/node-mapnik/wiki/WindowsBinaries for more details.
The 1.x series require the Visual C++ Redistributable Packages for Visual Studio 2013:
To build from source you need:
Install Mapnik using the instructions at: https://github.com/mapnik/mapnik/wiki/Mapnik-Installation
Confirm that the mapnik-config program is available and on your $PATH.
Then run:
npm install mapnik --build-from-source
Windows builds are maintained in https://github.com/mapbox/windows-builds
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
3.5.0
This is a major update and reflects a large number of changes added into node-mapnik due to update of the Mapbox Vector Tile Specification. As part of this the mapnik-vector-tile library was updated to 1.0.0. Therefore, a large number of interfaces changes have taken place around the mapnik.VectorTile object.
It is important to know that the concept of width and height have been removed from mapnik.VectorTile objects. This is replaced by the concept of tileSize. While width and height were based on the concept of an Image size created from a vector tile, tileSize is directly related to the extent as defined in the Layer of a vector tile. For understanding what the Layer and extent is please see the Vector Tile Specification. This also changed the buffer_size arguments that were commonly used in many Vector Tile methods, which was also based on the Image size. The vector tile object now contains a bufferSize which represents the buffer added to the layer extent in a tile.
Internally, all methods now depend on V2 tiles, however, any V1 tiles that are loaded into a mapnik.VectorTile object will automatically be updated.
Summary of changes:
mapnik.VectorTile.addData now verifies buffers validity and internally updates v1 tiles to v2mapnik.VectorTile.addDataSync now verifies buffers validity and internally updates v1 tiles to v2mapnik.VectorTile.setData now verifies buffers validity and internally updates v1 tiles to v2mapnik.VectorTile.setDataSync now verifies buffers validity and internally updates v1 tiles to v2mapnik.VectorTile.addImage now takes a mapnik.Image object rather then a buffer, it also takes optional arguments image_scaling and image_format.mapnik.VectorTile.addImageBuffer replaces the old functionality of of mapnik.VectorTile.addImagemapnik.VectorTile.addImageSync and made mapnik.VectorTile.addImage accept a callback.mapnik.VectorTile.addImageBufferSync and made mapnik.VectorTile.addImageBuffer accept a callback.mapnik.VectorTile.height() method is removedmapnik.VectorTile.width() method is removedmapnik.VectorTile.parse() method is removedmapnik.VectorTile.IsSolid() method is removedmapnik.shutdown() is removedmapnik.VectorTile objects are no longer permitted.mapnik.VectorTile.extent() method which returns the bounding box of a tile in EPSG:3857mapnik.VectorTile.bufferedExtent() method which returns the bounding box including buffer of a tile in EPSG:3857mapnik.VectorTile.emptyLayers() method which returns the name of layers which were not added to a tile during any tile rendering operation.mapnik.VectorTile.paintedLayers() method which returns the name of layers which were considered painted during rendering or layers that contain data.mapnik.VetorTile.tileSize property.mapnik.VetorTile.bufferSize property.mapnik.VectorTile class methodspath_multiplier from the code entirely.tile_size and buffer_size to mapnik.VectorTile constructor.FAQs
Tile rendering library for node
The npm package mapnik receives a total of 1,565 weekly downloads. As such, mapnik popularity was classified as popular.
We found that mapnik demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 9 open source maintainers collaborating on the project.
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