work around ProjTransform crash with older Proj library

See also python-mapnik issue #273

mapnik/python-mapnik#273

ocitysmap/coords.py

@@ -33,6 +33,11 @@
     "Mapnik module version %s is too old, see ocitysmap's INSTALL " \
     "for more details." % mapnik.mapnik_version_string()
 
+import logging
+
+LOG = logging.getLogger('ocitysmap')
+
+
 EARTH_RADIUS = 6370986 # meters
 
 def dd2dms(value):
@@ -44,20 +49,21 @@ def dd2dms(value):
 
     return (degrees, minutes, seconds)
 
-def get_proj_transformation():
-    try:
-        # new Proj library versions (e.g. v9 on Debian 12)
-        proj_wgs84  = mapnik.Projection("epsg:4326") 
-        proj_google = mapnik.Projection("epsg:3857")
-    except:
-        # old Proj libraray versions (e.g. v7 on Debian 11)
-        proj_wgs84  = mapnik.Projection("+init=epsg:4326")
-        proj_google = mapnik.Projection( "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 " \
-                                         "+lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m   " \
-                                         "+nadgrids=@null +no_defs +over")
-
-    return mapnik.ProjTransform(proj_wgs84, proj_google)
+try:
+    # new Proj library versions (e.g. v9 on Debian 12)
+    _proj_wgs84  = mapnik.Projection("epsg:4326")
+    _proj_google = mapnik.Projection("epsg:3857")
+except:
+    # old Proj libraray versions (e.g. v7 on Debian 11)
+    _proj_wgs84  = mapnik.Projection("+init=epsg:4326")
+    _proj_google = mapnik.Projection( "+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 " \
+                                     "+lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m   " \
+                                     "+nadgrids=@null +no_defs +over")
 
+
+def get_proj_transformation():
+    return mapnik.ProjTransform(_proj_wgs84, _proj_google)
+
 class Point:
     def __init__(self, lat, long_):
         self._lat, self._long = float(lat), float(long_)

ocitysmap/layoutlib/single_page_renderer/no_index.py

@@ -1,5 +1,8 @@
 from gettext import gettext
 
+import logging
+LOG = logging.getLogger('ocitysmap')
+
 import ocitysmap
 from ocitysmap.layoutlib.abstract_renderer import Renderer
 from ocitysmap.layoutlib.single_page_renderers import SinglePageRenderer