+// ATCProjection.cxx - 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.
+
#include "ATCProjection.hxx"
#include <math.h>
#include <simgear/constants.h>
}
Point3D FGATCProjection::ConvertFromLocal(Point3D pt) {
- return(Point3D(0,0,0));
+ double delta_lat = asin(pt.y() / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES;
+ double delta_lon = (asin(pt.x() / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES) / correction_factor;
+
+ return(Point3D(origin.lon()+delta_lon, origin.lat()+delta_lat, 0.0));
}
/**********************************************************************************/
double delta_lon = pt.lon() - origin.lon();
double y = sin(delta_lat * DCL_DEGREES_TO_RADIANS) * SG_EQUATORIAL_RADIUS_M;
double x = sin(delta_lon * DCL_DEGREES_TO_RADIANS) * SG_EQUATORIAL_RADIUS_M * correction_factor;
- //cout << "Before alignment, x = " << x << " y = " << y << '\n';
// Align
double xbar = x;
x = x*cos(theta) - y*sin(theta);
y = (xbar*sin(theta)) + (y*cos(theta));
- //cout << "After alignment, x = " << x << " y = " << y << '\n';
return(Point3D(x,y,0.0));
}
Point3D FGATCAlignedProjection::ConvertFromLocal(Point3D pt) {
- return(Point3D(0,0,0));
+ // de-align
+ double thi = theta * -1.0;
+ double x = pt.x()*cos(thi) - pt.y()*sin(thi);
+ double y = (pt.x()*sin(thi)) + (pt.y()*cos(thi));
+
+ // convert from orthogonal to lat/lon
+ double delta_lat = asin(y / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES;
+ double delta_lon = (asin(x / SG_EQUATORIAL_RADIUS_M) * DCL_RADIANS_TO_DEGREES) / correction_factor;
+
+ return(Point3D(origin.lon()+delta_lon, origin.lat()+delta_lat, 0.0));
}