first prototype for openscad rendering

src/c3nav/mapdata/management/commands/renderscad.py

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+import os
+from django.conf import settings
+from django.core.management.base import BaseCommand
+
+from c3nav.mapdata.utils.scad import polygon_scad
+
+
+class Command(BaseCommand):
+    help = 'render the map to openscad'
+
+    def handle(self, *args, **options):
+        from c3nav.mapdata.models import AltitudeArea
+        filename = os.path.join(settings.RENDER_ROOT, 'all.scad')
+        with open(filename, 'w') as f:
+            for area in AltitudeArea.objects.all():
+                f.write('translate([0, 0, %.2f]) ' % area.altitude)
+                f.write(polygon_scad(area.geometry)+';\n')

src/c3nav/mapdata/utils/scad.py

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+import json
+
+from shapely.geometry import mapping
+
+
+def polygon_scad(polygon):
+    return 'polygon(points='+json.dumps(mapping(polygon)['coordinates'][0], separators=(',', ':'))+')'