src/Projection/WindowProjection.cpp

   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 #include "WindowProjection.hpp"
  25
  26 bool
  27 WindowProjection::GeoVisible(const GeoPoint &loc) const
  28 {
  29   return screenbounds_latlon.IsInside(loc);
  30 }
  31
  32 bool
  33 WindowProjection::GeoToScreenIfVisible(const GeoPoint &loc, RasterPoint &sc) const
  34 {
  35   if (GeoVisible(loc)) {
  36     sc = GeoToScreen(loc);
  37     return ScreenVisible(sc);
  38   }
  39
  40   return false;
  41 }
  42
  43 bool
  44 WindowProjection::ScreenVisible(const RasterPoint &P) const
  45 {
  46   assert(screen_size_initialised);
  47
  48   return P.x >= 0 && (unsigned)P.x < screen_width &&
  49     P.y >= 0 && (unsigned)P.y < screen_height;
  50 }
  51
  52 void
  53 WindowProjection::SetScaleFromRadius(fixed radius)
  54 {
  55   SetScale(fixed(GetMinScreenDistance()) / (radius * 2));
  56 }
  57
  58 fixed
  59 WindowProjection::GetMapScale() const
  60 {
  61   return DistancePixelsToMeters(GetMapResolutionFactor());
  62 }
  63
  64 fixed
  65 WindowProjection::GetScreenDistanceMeters() const
  66 {
  67   return DistancePixelsToMeters(GetScreenDistance());
  68 }
  69
  70 GeoPoint
  71 WindowProjection::GetGeoScreenCenter() const
  72 {
  73   return ScreenToGeo(GetScreenWidth() / 2, GetScreenHeight() / 2);
  74 }
  75
  76 void
  77 WindowProjection::UpdateScreenBounds()
  78 {
  79   assert(screen_size_initialised);
  80
  81   if (!IsValid())
  82     return;
  83
  84   GeoBounds sb(ScreenToGeo(0, 0));
  85   sb.Extend(ScreenToGeo(screen_width, 0));
  86   sb.Extend(ScreenToGeo(screen_width, screen_height));
  87   sb.Extend(ScreenToGeo(0, screen_height));
  88
  89   screenbounds_latlon = sb;
  90 }