Function ShrinkAndScaleInto

libs/drape_frontend/screen_operations.cpp:146–222

}

ScreenBase const ShrinkAndScaleInto(ScreenBase const & screen, m2::RectD const & boundRect)
{
  ScreenBase res = screen;

  m2::RectD globalRect = res.ClipRect();

  m2::PointD newOrg = res.GetOrg();
  double scale = 1;
  double offs = 0;

  if (globalRect.minX() < boundRect.minX())
  {
    offs = boundRect.minX() - globalRect.minX();
    globalRect.Offset(offs, 0);
    newOrg.x += offs;

    if (globalRect.maxX() > boundRect.maxX())
    {
      double k = boundRect.SizeX() / globalRect.SizeX();
      scale /= k;
      /// scaling always occur pinpointed to the rect center...
      globalRect.Scale(k);
      /// ...so we should shift a rect after scale
      globalRect.Offset(boundRect.minX() - globalRect.minX(), 0);
    }
  }

  if (globalRect.maxX() > boundRect.maxX())
  {
    offs = boundRect.maxX() - globalRect.maxX();
    globalRect.Offset(offs, 0);
    newOrg.x += offs;

    if (globalRect.minX() < boundRect.minX())
    {
      double k = boundRect.SizeX() / globalRect.SizeX();
      scale /= k;
      globalRect.Scale(k);
      globalRect.Offset(boundRect.maxX() - globalRect.maxX(), 0);
    }
  }

  if (globalRect.minY() < boundRect.minY())
  {
    offs = boundRect.minY() - globalRect.minY();
    globalRect.Offset(0, offs);
    newOrg.y += offs;

    if (globalRect.maxY() > boundRect.maxY())
    {
      double k = boundRect.SizeY() / globalRect.SizeY();
      scale /= k;
      globalRect.Scale(k);
      globalRect.Offset(0, boundRect.minY() - globalRect.minY());
    }
  }

  if (globalRect.maxY() > boundRect.maxY())