395c317627
so we can split ATIS voice files into separate files, i.e. for airport names and phraseology, so we don't need to regenerate airport names when extending/changing phraseology. Also allows to add custom airport names. Enable switching voice files at run-time (different airports could have different voices...).
79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
// ATCProjection.cxx - A convenience projection class for the ATC/AI system.
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//
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// Written by David Luff, started 2002.
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//
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// Copyright (C) 2002 David C Luff - david.luff@nottingham.ac.uk
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "ATCProjection.hxx"
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#include <math.h>
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#include <simgear/constants.h>
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FGATCAlignedProjection::FGATCAlignedProjection() {
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_origin.setLatitudeRad(0);
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_origin.setLongitudeRad(0);
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_origin.setElevationM(0);
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_correction_factor = cos(_origin.getLatitudeRad());
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}
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FGATCAlignedProjection::FGATCAlignedProjection(const SGGeod& centre, double heading) {
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_origin = centre;
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_theta = heading * SG_DEGREES_TO_RADIANS;
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_correction_factor = cos(_origin.getLatitudeRad());
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}
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FGATCAlignedProjection::~FGATCAlignedProjection() {
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}
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void FGATCAlignedProjection::Init(const SGGeod& centre, double heading) {
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_origin = centre;
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_theta = heading * SG_DEGREES_TO_RADIANS;
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_correction_factor = cos(_origin.getLatitudeRad());
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}
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SGVec3d FGATCAlignedProjection::ConvertToLocal(const SGGeod& pt) {
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// convert from lat/lon to orthogonal
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double delta_lat = pt.getLatitudeRad() - _origin.getLatitudeRad();
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double delta_lon = pt.getLongitudeRad() - _origin.getLongitudeRad();
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double y = sin(delta_lat) * SG_EQUATORIAL_RADIUS_M;
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double x = sin(delta_lon) * SG_EQUATORIAL_RADIUS_M * _correction_factor;
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// Align
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if(_theta != 0.0) {
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double xbar = x;
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x = x*cos(_theta) - y*sin(_theta);
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y = (xbar*sin(_theta)) + (y*cos(_theta));
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}
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return SGVec3d(x, y, pt.getElevationM());
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}
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SGGeod FGATCAlignedProjection::ConvertFromLocal(const SGVec3d& pt) {
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// de-align
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double thi = _theta * -1.0;
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double x = pt.x()*cos(thi) - pt.y()*sin(thi);
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double y = (pt.x()*sin(thi)) + (pt.y()*cos(thi));
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// convert from orthogonal to lat/lon
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double delta_lat = asin(y / SG_EQUATORIAL_RADIUS_M);
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double delta_lon = asin(x / SG_EQUATORIAL_RADIUS_M) / _correction_factor;
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return SGGeod::fromRadM(_origin.getLongitudeRad()+delta_lon, _origin.getLatitudeRad()+delta_lat, pt.z());
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}
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