Esempi in C++ (Cpp) per WindowProjection::PixelsToAngle

Esempio n. 1

File: HeightMatrix.cpp Progetto: galippi/xcsoar

void
HeightMatrix::Fill(const RasterMap &map, const WindowProjection &projection,
                   unsigned quantisation_pixels, bool interpolate)
{
  const unsigned screen_width = projection.GetScreenWidth();
  const unsigned screen_height = projection.GetScreenHeight();

  SetSize((screen_width + quantisation_pixels - 1) / quantisation_pixels,
          (screen_height + quantisation_pixels - 1) / quantisation_pixels);

  minimum = 0x7fff;
  maximum = 0;

  for (unsigned y = 0; y < screen_height; y += quantisation_pixels) {
    const FastRowRotation rotation =
      projection.GetScreenAngleRotation(y - projection.GetScreenOrigin().y);

    short *p = data.begin() + y * width / quantisation_pixels;

    for (unsigned x = 0; x < screen_width; x += quantisation_pixels) {
#ifndef SLOW_TERRAIN_STUFF
      const FastRowRotation::Pair r =
        rotation.Rotate(x - projection.GetScreenOrigin().x);

      GeoPoint gp;
       gp.Latitude = projection.GetGeoLocation().Latitude
         - projection.PixelsToAngle(r.second);
       gp.Longitude = projection.GetGeoLocation().Longitude
         + projection.PixelsToAngle(r.first)
        * gp.Latitude.invfastcosine();
#else
      GeoPoint gp = projection.ScreenToGeo(x, y);
#endif

      short h = interpolate ? map.GetFieldInterpolated(gp) : map.GetField(gp);
      if (!RasterBuffer::is_special(h)) {
        if (h < minimum)
          minimum = h;
        if (h > maximum)
          maximum = h;
      }

      *p++ = h;
    }

    assert(p <= data.end());
  }
}