src/Geo/GeoVector.cpp

   1 /* Copyright_License {
   2
   3   XCSoar Glide Computer - http://www.xcsoar.org/
   4   Copyright (C) 2000-2013 The XCSoar Project
   5   A detailed list of copyright holders can be found in the file "AUTHORS".
   6
   7   This program is free software; you can redistribute it and/or
   8   modify it under the terms of the GNU General Public License
   9   as published by the Free Software Foundation; either version 2
  10   of the License, or (at your option) any later version.
  11
  12   This program is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with this program; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20 }
  21  */
  22
  23 #include "GeoVector.hpp"
  24 #include "GeoPoint.hpp"
  25 #include "Math.hpp"
  26
  27 GeoVector::GeoVector(const GeoPoint &source, const GeoPoint &target)
  28 {
  29   *this = source.DistanceBearing(target);
  30 }
  31
  32 GeoPoint
  33 GeoVector::EndPoint(const GeoPoint &source) const
  34 {
  35   if (!positive(distance))
  36     return source;
  37
  38   return ::FindLatitudeLongitude(source, bearing, distance);
  39 }
  40
  41 GeoPoint
  42 GeoVector::MidPoint(const GeoPoint &source) const
  43 {
  44   if (!positive(distance))
  45     return source;
  46
  47   return ::FindLatitudeLongitude(source, bearing, Half(distance));
  48 }
  49
  50 fixed
  51 GeoVector::MinimumDistance(const GeoPoint &source,
  52                             const GeoPoint &ref) const
  53 {
  54   return ::CrossTrackError(source, EndPoint(source), ref, nullptr);
  55 }