1 files changed, 17 insertions, 1 deletions
diff --git a/mensa/base.py b/mensa/base.py
index a6e8cfa..8db5b8c 100644
--- a/mensa/base.py
+++ b/mensa/base.py
@@ -36,17 +36,33 @@ def formt (food) :
         if i.desc :
             r = r+"\t  "+i.desc+"\n"
     return r
+from math import acos, radians, pi, cos, sin
+def dist(pos1, pos2) :
+    # gives a rough estimate of the distance Accuracy: +/- cos(angle
+    # between coordinates)*37/2pi. (about +/- 50 m for distances).
+    # Distance is returned in km
+    if pos1 is None or pos2 is None :
+        return float("Inf")
+    lat1, long1 = pos1
+    lat2, long2 = pos2
+
+    a = radians(90 - lat1);
+    b = radians(90 - lat2);
+    C = radians(abs(long1-long2));
+    return acos(cos(a)*cos(b)+sin(a)*sin(b)*cos(C))*40040/(2*pi);
+
 
 foodsources = {}
 renderers = {}
 
 class Restaurant(object):
-    def __init__(self, name, human_name, module, optional_args=[], obligatory_args=()):
+    def __init__(self, name, human_name, module, optional_args=[], obligatory_args=(), pos=None):
         self.name = name
         self.human_name = human_name
         self.module = module
         self.optional_args = optional_args
         self.obligatory_args = obligatory_args
+        self.pos = pos
 
     def get_food(self,**opt_args) :
         return self.module.get_food_items(*self.obligatory_args, **opt_args)