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Cascadenik

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Cascading Sheets Of Style for Mapnik

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- __init__.py
- compile.py
- nonposix.py
- output.py
- parse.py
- safe64.py
- sources.py
- style.py
- tests.py
- points.json
- test.tif
- world_merc.dbf
- world_merc.prj
- world_merc.shp
- world_merc.shx
- world_merc.zip
- example1.mml
- example1.png
- example2.mml
- example2.png
- example3.mml
- example3.png
- example4.mml
- example4.mss
- example4.png
- example5.mml
- example6.mml
- example7.mml
- example8.mml
- index.html
- purple-point.png
- - graveyard-z.png
  - horizontal-shield-1.png
  - horizontal-shield-2.png
  - horizontal-shield-3.png
  - horizontal-shield-4.png
  - horizontal-shield-5.png
  - horizontal-shield-6.png
  - horizontal-shield-7.png
  - horizontal-shield-8.png
  - horizontal-shield-9.png
  - horizontal-shield.png
  - oneway-arrow.png
  - rail-medium.png
  - rail-narrow.png
  - rail-normal.png
  - rail-wide.png
  - station-large.png
  - station-small.png
  - trees-z.png
- figure.mml
- ground.mml
- ground.mss
- paths.mss
- places.mss
- rail.mss
- roads.mss
- style.mml
- style_alt_config.patch
.gitignore
AUTHORS.txt
cascadenik-compile.py
cascadenik-extract-dscfg.py
cascadenik-style.py
CHANGELOG.md
example.cfg
example.mml
example.mss
example_dscfg.mml
INSTALL.md
LICENSE.txt
Makefile
MANIFEST.in
README.md
requirements.txt
setup.py

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Cascadenik
==========

Cascadenik implements cascading stylesheets for Mapnik.

It’s an abstraction layer and preprocessor that converts special, CSS-like
syntax into Mapnik-compatible style definitions. It’s easier to write complex
style rules using the alternative syntax, because it allows for separation of
symbolizers and provides a mechanism for inheritance.

Cascadenik supports many of Mapnik’s features in a simple declarative form:

/* Define a few colors */
    @black: #000;
    @orange: #f90;
    
    /* Start with a white background */
    Map
    {
        map-bgcolor: #fff;
    }
    
    /* Draw roads as orange lines */
    #roads
    {
        /* Usually, 3px wide */
        line-width: 3;
        line-color: @orange;
        
        /* Make the important ones wider */
        &[kind=major] { line-width: 4 }
        &[kind=highway] { line-width: 5 }
        
        /* Add the road names in black */
        name
        {
            text-placement: line;
            text-face-name: "DejaVu Sans Book";
            text-fill: @black;
            text-size: 12;
        }
    }

See more examples at https://github.com/mapnik/Cascadenik/wiki/Examples.

Usage
-----

See `INSTALL.md` for installation instructions.

See the `doc/` folder for more usage examples.

Unroll the rules in example.mss and show their cascade order:

% cascadenik-style.py example.mss > example-ordered-unrolled.mss

Compile `example.mml` into a Mapnik-suitable XML file:

% cascadenik-compile.py example.mml example-compiled.xml

Render a MML file directly to an image using nik2img.py:

% nik2img.py example.mml example.png