- [How to style labels](https://www.mapbox.com/tilemill/docs/guides/styling-labels/)
- [How to style lines](https://www.mapbox.com/tilemill/docs/guides/styling-lines/)
- [How to style polygons](https://www.mapbox.com/tilemill/docs/guides/styling-polygons/)
- See also the (Styling Concepts)[#styling-concepts] for explanations of advanced features.
## Developers
#### Installation
If you're using [TileMill](http://mapbox.com/tilemill/), you're already
using CartoCSS and don't need to do a thing.
If you're a developer-type and want to use the `carto` binary with
`node.js` (and you have [npm](http://npmjs.org/) installed),
npm install -g carto
Optionally you may also want to install millstone which is required for resolving data in the same way as TileMill does:
npm install -g millstone
Having `millstone` installed specifically enable support for localizing external resources (URLs and local files) referenced in your mml file, and detecting projections (using [node-srs](https://github.com/mapbox/node-srs))
Now that Carto is installed you should have a `carto` command line tool available that can be run on a TileMill project:
carto project.mml > mapnik.xml
#### From code
Currently CartoCSS is designed to be invoked from [node.js](http://nodejs.org/).
The `Renderer` interface is the main API for developers, and it takes an MML file as a string as input.
// defined variables:
// - input (the name or identifier of the file being parsed)
// - data (a string containing the MML or an object of MML)
var carto = require('carto');
new carto.Renderer({
filename: input,
local_data_dir: path.dirname(input),
}).render(data, function(err, output) {
if (err) {
if (Array.isArray(err)) {
err.forEach(function(e) {
carto.writeError(e, options);
});
} else { throw err; }
} else {
sys.puts(output);
}
});
### Vim
For details about how to install Carto from source and use on the command line see the [Installation section](#installation).
To install, download or clone this repository, then add the `vim-carto`
directory located at `build/vim-carto` to your `~/.vim` file.
## Credits
CartoCSS is based on [less.js](https://github.com/cloudhead/less.js), a CSS compiler written by Alexis Sellier.
@ -124,14 +63,6 @@ While attachments allow creating implicit "layers" with the same data, using **i
This makes Mapnik first draw the line of color #333 with a width of 6, and then immediately afterwards, it draws the same line again with width 4 and color #666. Contrast that to attachments: Mapnik would first draw all casings before proceeding to the actual lines.
## Rasters and Buildings
_new_
Rasters are supported in CartoCSS - it knows how to download `.vrt`, `.tiff`, and soon other raster formats, and the properties of the [RasterSymbolizer](http://trac.mapnik.org/wiki/RasterSymbolizer) are exposed in the language.
The [BuildingSymbolizer](http://trac.mapnik.org/wiki/BuildingSymbolizer) is also supported in `CartoCSS`. The code stores symbolizer types and properties in a JSON file (in `tree/reference.json`), so new Mapnik features can be quickly implemented here.
## Variables & Expressions
CartoCSS inherits from its basis in [less.js](http://lesscss.org/) some new features in CSS. One can define variables in stylesheets, and use expressions to modify them.
@ -243,6 +174,71 @@ String comparisons:
#world[name =~ "A.*"]
```
#### Installation
If you're using [TileMill](http://mapbox.com/tilemill/), you're already
using CartoCSS and don't need to do a thing.
If you're a developer-type and want to use the `carto` binary with
`node.js` (and you have [npm](http://npmjs.org/) installed),
npm install -g carto
Optionally you may also want to install millstone which is required for resolving data in the same way as TileMill does:
npm install -g millstone
Having `millstone` installed specifically enable support for localizing external resources (URLs and local files) referenced in your mml file, and detecting projections (using [node-srs](https://github.com/mapbox/node-srs))
Now that Carto is installed you should have a `carto` command line tool available that can be run on a TileMill project:
carto project.mml > mapnik.xml
#### From code
Currently CartoCSS is designed to be invoked from [node.js](http://nodejs.org/).
The `Renderer` interface is the main API for developers, and it takes an MML file as a string as input.
// defined variables:
// - input (the name or identifier of the file being parsed)
// - data (a string containing the MML or an object of MML)
var carto = require('carto');
new carto.Renderer({
filename: input,
local_data_dir: path.dirname(input),
}).render(data, function(err, output) {
if (err) {
if (Array.isArray(err)) {
err.forEach(function(e) {
carto.writeError(e, options);
});
} else { throw err; }
} else {
sys.puts(output);
}
});
### Vim
To install, download or clone this repository, then add the `vim-carto`
directory located at `build/vim-carto` to your `~/.vim` file.
## Credits
CartoCSS is based on [less.js](https://github.com/cloudhead/less.js), a CSS compiler written by Alexis Sellier.
Dane Springmeyer
11 years ago