Kartograph config generator for QGis

readme.md

You can use this script to generate Kartograph configurations from the QGis Python console based on your current project. At the moment this works only for vector layers created from ESRI shapefiles.

1. Copy and paste the script into the console
2. Type qgis2kartograph('map.json') to generate the configuration

qgis2kartograph.py

# Very first draft of a Kartograph config generator for QGis

from qgis.core import *
import json


def hexcol(c):
    return '#%02x%02x%02x' % (c.red(), c.green(), c.blue())


def get_attrs_from_symbol(symbol):
    attrs = {}
    if isinstance(symbol, QgsLineSymbolV2):
        attrs['fill'] = 'none'
        attrs['stroke'] = hexcol(symbol.color())
        attrs['stroke-width'] = symbol.width() * 2
    elif isinstance(symbol, QgsFillSymbolV2):
        attrs['fill'] = hexcol(symbol.color())
        attrs['stroke'] = 'none'
    if symbol.alpha() < 1.0:
        attrs['opacity'] = symbol.alpha()
    return attrs


def qgis2kartograph(filename):
    out = []
    layers = qgis.utils.iface.mapCanvas().layers()
    for layer in layers:
        l = dict(id=str(layer.name()))
        l['src'] = unicode(layer.publicSource())
        l['styles'] = {}
        renderer = layer.rendererV2()
        if isinstance(renderer, QgsSingleSymbolRendererV2):
            l['styles']['single'] = get_attrs_from_symbol(renderer.symbol())
        elif isinstance(renderer, QgsCategorizedSymbolRendererV2):
            l['styles']['categorized'] = dict(column=str(renderer.classAttribute()), attrs={})
            for cat in renderer.categories():
                val = str(cat.value().toString())
                attrs = get_attrs_from_symbol(cat.symbol())
                l['styles']['categorized']['attrs'][val] = attrs
        out.append(l)
    out.reverse()
    cfg = dict(layers=out)
    open(filename, 'w').write(json.dumps(cfg))