src/Terrain/RasterLocation.hpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #ifndef XCSOAR_TERRAIN_RASTER_LOCATION_HPP
  25 #define XCSOAR_TERRAIN_RASTER_LOCATION_HPP
  26
  27 #include "Compiler.h"
  28
  29 #include <cstdlib>
  30
  31 /**
  32  * A point within a RasterMap.
  33  */
  34 struct RasterLocation {
  35   unsigned x, y;
  36
  37   RasterLocation() = default;
  38   constexpr RasterLocation(unsigned _x, unsigned _y):x(_x), y(_y) {}
  39
  40   constexpr bool operator==(const RasterLocation &other) const {
  41     return x == other.x && y == other.y;
  42   }
  43
  44   constexpr bool operator!=(const RasterLocation &other) const {
  45     return !(*this == other);
  46   }
  47
  48   constexpr RasterLocation operator>>(unsigned bits) const {
  49     return RasterLocation(x >> bits, y >> bits);
  50   }
  51
  52   constexpr RasterLocation operator<<(unsigned bits) const {
  53     return RasterLocation(x << bits, y << bits);
  54   }
  55
  56   gcc_pure
  57   unsigned ManhattanDistance(const RasterLocation &other) const {
  58     return std::abs((int)x - (int)other.x) +
  59       std::abs((int)y - (int)other.y);
  60   }
  61 };
  62
  63 #endif