--- a/Indoor.cpp	Tue Apr 08 17:39:59 2014 +0600
+++ b/Indoor.cpp	Wed Apr 09 21:22:06 2014 +0200
@@ -6288,4 +6288,16 @@
     pIndoor->pDoors[door_id].uTimeSinceTriggered = 15360;
   }
   return;
+}
+
+
+//----- (004088E9) --------------------------------------------------------
+int __fastcall sub_4088E9(int x1, int y1, int x2, int y2, int x3, int y3)
+{
+  signed int result; // eax@1
+
+  result = integer_sqrt(abs(x2 - x1) * abs(x2 - x1) + abs(y2 - y1) * abs(y2 - y1));
+  if ( result )
+    result = abs(((x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3)) / result);
+  return result;
 }
\ No newline at end of file