src/Projection/MapWindowProjection.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_MAPWINDOW_PROJECTION_HPP
  25 #define XCSOAR_MAPWINDOW_PROJECTION_HPP
  26
  27 #include "WindowProjection.hpp"
  28 #include "Math/fixed.hpp"
  29 #include "Compiler.h"
  30
  31 struct Waypoint;
  32
  33 class MapWindowProjection:
  34   public WindowProjection
  35 {
  36 public:
  37   /**
  38    * Sets a map scale which is not affected by the hard-coded scale
  39    * list.
  40    */
  41   void SetFreeMapScale(const fixed x);
  42
  43   void SetMapScale(const fixed x);
  44
  45 public:
  46   bool HaveScaleList() const {
  47     return true;
  48   }
  49
  50   /**
  51    * Calculates a scale index.
  52    */
  53   gcc_pure
  54   fixed CalculateMapScale(unsigned scale) const;
  55
  56   gcc_pure
  57   fixed StepMapScale(const fixed scale, int Step) const;
  58
  59   gcc_pure
  60   bool WaypointInScaleFilter(const Waypoint &way_point) const;
  61
  62 private:
  63   fixed LimitMapScale(const fixed value) const;
  64
  65   gcc_pure
  66   unsigned FindMapScale(const fixed Value) const;
  67 };
  68
  69 #endif