(svn r23290) -Fix [FS#2379,FS#3569]: Change the centre of train vehicles to depend on the vehicle length instead of being fixed at 4/8th of the original vehicle length to make sure shortened vehicles don't block tiles they shouldn't block.

src/direction_func.h

@@ -239,4 +239,15 @@ static inline bool IsValidAxis(Axis d)
 	return d < AXIS_END;
 }
 
+/**
+ * Checks if a given Direction is diagonal.
+ *
+ * @param dir The given direction.
+ * @return True if the direction is diagonal.
+ */
+static inline bool IsDiagonalDirection(Direction dir)
+{
+	return (dir & 1) != 0;
+}
+
 #endif /* DIRECTION_FUNC_H */