From 627a31d3e3392e0d4121093de986689e32782715 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Laura=20Kl=C3=BCnder?= <laura@codingcatgirl.de>
Date: Fri, 20 Oct 2017 00:51:30 +0200
Subject: [PATCH] filter out undrawable geometries

---
 src/c3nav/mapdata/utils/svg.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/c3nav/mapdata/utils/svg.py b/src/c3nav/mapdata/utils/svg.py
index 20379dfb..d2e312c5 100644
--- a/src/c3nav/mapdata/utils/svg.py
+++ b/src/c3nav/mapdata/utils/svg.py
@@ -201,6 +201,17 @@ class SVGImage:
         # if altitude is set, the geometry will get a calculated shadow relative to the other geometries
         # if elevation is set, the geometry will get a shadow with exactly this elevation
 
+        # if fill_color is set, filter out geometries that cannot be filled
+        if fill_color is not None:
+            try:
+                geometry.geoms
+            except AttributeError:
+                pass
+            else:
+                geometry = type(geometry)(tuple(geom for geom in geometry.geoms if hasattr(geom, 'exterior')))
+        if geometry.is_empty:
+            pass
+
         attribs = ' fill="'+(fill_color or 'none')+'"'
         if fill_opacity:
             attribs += ' fill-opacity="'+str(fill_opacity)[:4]+'"'