Oliver Schroeder:

[flightgear.git] / src / ATC / ATCProjection.hxx

diff --git a/src/ATC/ATCProjection.hxx b/src/ATC/ATCProjection.hxx
index d5cf306a77f759797c25dddd5a1818acabbe2d9c..739c91a74cbbb494376362b4c2136effc151c904 100644 (file)
--- a/src/ATC/ATCProjection.hxx
+++ b/src/ATC/ATCProjection.hxx
@@ -1,3 +1,23 @@
+// ATCProjection.hxx - A convienience projection class for the ATC/AI system.
+//
+// Written by David Luff, started 2002.
+//
+// Copyright (C) 2002  David C Luff - david.luff@nottingham.ac.uk
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
 #ifndef _FG_ATC_PROJECTION_HXX
 #define _FG_ATC_PROJECTION_HXX
 
@@ -8,15 +28,16 @@ class FGATCProjection {
 
 public:
     FGATCProjection();
+    FGATCProjection(const Point3D& centre);
     ~FGATCProjection();
 
-    void Init(Point3D centre);
+    void Init(const Point3D& centre);
 
-    // Convert a lat/lon co-ordinate to the local projection
-    Point3D ConvertToLocal(Point3D pt);
+    // Convert a lat/lon co-ordinate (degrees) to the local projection (meters)
+    Point3D ConvertToLocal(const Point3D& pt);
 
-    // Convert a local projection co-ordinate to lat/lon
-    Point3D ConvertFromLocal(Point3D pt);
+    // Convert a local projection co-ordinate (meters) to lat/lon (degrees)
+    Point3D ConvertFromLocal(const Point3D& pt);
 
 private:
     Point3D origin;    // lat/lon of local area origin
@@ -33,13 +54,13 @@ public:
     FGATCAlignedProjection();
     ~FGATCAlignedProjection();
 
-    void Init(Point3D centre, double heading);
+    void Init(const Point3D& centre, double heading);
 
-    // Convert a lat/lon co-ordinate to the local projection
-    Point3D ConvertToLocal(Point3D pt);
+    // Convert a lat/lon co-ordinate (degrees) to the local projection (meters)
+    Point3D ConvertToLocal(const Point3D& pt);
 
-    // Convert a local projection co-ordinate to lat/lon
-    Point3D ConvertFromLocal(Point3D pt);
+    // Convert a local projection co-ordinate (meters) to lat/lon (degrees)
+    Point3D ConvertFromLocal(const Point3D& pt);
 
 private:
     Point3D origin;    // lat/lon of local area origin (the threshold)