void
DisplayWindow::UseGlobalScale()
{
#ifndef RELEASE
    CallStackEntry entry("DisplayWindow::UseGlobalScale");
#endif
    const double minVal = MinRealWindowVal();
    const double maxVal = MaxRealWindowVal();
    display_->DisplayReal( matrix_, minVal, maxVal );
}
void
DisplayWindow::SetScale( bool global )
{
#ifndef RELEASE
    CallStackEntry entry("DisplayWindow::SetScale");
#endif
    if( global )
    {
        const double minVal = MinRealWindowVal();
        const double maxVal = MaxRealWindowVal();
        display_->DisplayReal( matrix_, minVal, maxVal );
    }
    else
    {
        display_->DisplayReal( matrix_ );
    }
}