Manually parse SVG polygons for space arrangement

src/ifcopenshell-python/ifcopenshell/draw.py

@@ -21,6 +21,8 @@
 import math
 import json
 import functools
+import re
+import warnings
 
 import ifcopenshell
 import ifcopenshell.geom
@@ -213,11 +215,11 @@ def main(
     if not settings.cells:
         return svg_data_1.encode("ascii", "xmlcharrefreplace")
 
-    def yield_groups(n):
+    def yield_groups(n, tag='g'):
-        if n.nodeType == n.ELEMENT_NODE and n.tagName == "g":
+        if n.nodeType == n.ELEMENT_NODE and n.tagName == tag:
             yield n
         for c in n.childNodes:
-            yield from yield_groups(c)
+            yield from yield_groups(c, tag=tag)
 
     dom1 = parseString(svg_data_1)
     svg1 = dom1.childNodes[0]
@@ -427,7 +429,18 @@ def main(
             for j in range(len(root_groups)):
                 if i != j:
                     parent.removeChild(root_groups[j])
-            polies = W.svg_to_polygons(svg1.toxml(), "IfcSpace")
+
+            # wasteful and looses data for unknown reasons
+            # svg_contents = svg1.toxml()
+            # polies = W.svg_to_polygons(svg_contents, "IfcSpace")
+            
+            polies = [p.getAttribute('d') for p in yield_groups(svg1, "path") if 'IfcSpace' in p.parentNode.getAttribute('class')]
+            polies = [[[*map(float, s[1:].split(','))] for s in d.split(' ')] for d in polies]
+            def create_poly(b):
+                p = ifcopenshell.ifcopenshell_wrapper.polygon_2()
+                p.boundary = b
+                return p
+            polies = [create_poly(p) for p in polies]
 
             def min_bound_extent(p):
                 arr = numpy.array(p.boundary)