Drawing a static grid on a pixmap/Qlabel

[gone_bush]

I have an app that displays an image in a QLabel. I zoom and drag the image with the mouse - this works! (yea for me)

What I want to do now is to draw a (Rule of Thirds) grid over the image.

The problem is that the grid moves whenever I drag the image.

I've tried using coordinates bases on width() and height() of the ImageLabel and of the pixmap returned via pixmap();

Neither results in a static grid.

HELP!!!

[ChrisW67]

How are you drawing the grid and image?

[gone_bush]

@ChrisW67 image via

setPixmap( QPixmap::fromImage( image ));

zoom via

wheelEvent

dragging via

mousePress/Move/Release

grid via

paintEvent

[gone_bush]

For the historical record, I finally got it working. My code:

`

  QRect screenGeometry = QGuiApplication::primaryScreen( )->geometry( );

    int x13;
    int x23;
    int y13;
    int y23;

    if( screenGeometry.width( ) < width( ))
    {       x13 = m_image->getScrollX( ) +     screenGeometry.width( ) / 3.0;
            x23 = m_image->getScrollX( ) + 2 * screenGeometry.width( ) / 3.0;
    }
    else
    {       x13 = m_image->getScrollX( ) +     width( ) / 3.0;
            x23 = m_image->getScrollX( ) + 2 * width( ) / 3.0;
    }

    if( screenGeometry.height( ) < height( ))
    {       y13 = m_image->getScrollY( ) +     screenGeometry.height( ) / 3.0;
            y23 = m_image->getScrollY( ) + 2 * screenGeometry.height( ) / 3.0;
    }
    else
    {       y13 = m_image->getScrollY( ) +     height( ) / 3.0;
            y23 = m_image->getScrollY( ) + 2 * height( ) / 3.0;
    }

    QPainter painter( this );
    painter.setPen( QPen( Qt::red, 4, Qt::SolidLine, Qt::FlatCap ));

    painter.drawLine( 0, y13, width( ), y13 );
    painter.drawLine( 0, y23, width( ), y23 );

    painter.drawLine( x13, 0, x13, height( ));
    painter.drawLine( x23, 0, x23, height( ));

}

`