problem in drawing image in QLabel!

[mismael85]

hi every body;
i am facing a problem in drawing Image in a QLabel
i used the follwoing code to draw the image

m_pQiblaImage = new QImage(QSize(289,289),QImage::Format_ARGB32_Premultiplied);
    m_pPainter = new QPainter(m_pQiblaImage);
    m_pPainter->setCompositionMode(QPainter::CompositionMode_SourceOver);
    m_pPainter->translate(144.5,144.5);
    m_pPainter->save();
 
    //Compass background
    QString fileName(IMAGES_PATH);
    fileName.append("compass.png");
    QImage source(fileName);
    m_pPainter->rotate(360 - angleToNorth);
    m_pPainter->drawImage(-144.5,-144.5,source);
    // m_pPainter->restore();
    //m_pPainter->save();
 
    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("Qibla-needle.png");
    source.load(fileName);
    m_pPainter->rotate(NormalizeTo360(m_qibla-90/*+ (360-angleToNorth)*/));
    m_pPainter->drawImage(-114.5,-20.5,source);
    // m_pPainter->restore();
    //m_pPainter->save();
 
    if(QTime::currentTime() < m_prayerTimes[4] && QTime::currentTime() > m_prayerTimes[1] && m_gpsMode != 2/*ON*/)
    {
        //qDebug()<<"current time is "<< QTime::currentTime();
        //qDebug()<<"prayer Time = "<<m_prayerTimes[5];
        fileName.clear();
        fileName.append(IMAGES_PATH);
        fileName.append("sun-needle.png");
        source.load(fileName);
        m_pPainter->rotate(360 - NormalizeTo360(getSunQiblaDir(m_CityInfo.longitude, m_CityInfo.latitude) * DPR)/*+(360 - angleToNorth)*/);
        m_pPainter->drawImage(-114.5,-20.5,source);
        m_pPainter->restore();
        m_pPainter->save();
    }
    else
    {
        m_pPainter->restore();
        m_pPainter->save();
    }
    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("Compass-needle.png");
    source.load(fileName);
    m_pPainter->rotate(360 - angleToNorth);
    m_pPainter->drawImage(-17.5,-106.5,source);
    m_pPainter->restore();
    m_pPainter->save();
 
    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("compass-center.png");
    source.load(fileName);
    m_pPainter->drawImage(-10.5,-10.5,source);
    m_pPainter->restore();
    m_pPainter->save();
 
    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("compass-glass.png");
    source.load(fileName);
    m_pPainter->drawImage(-144.5, -144.5,source);
    m_pPainter->end();
 
    ui->compass->setPixmap(QPixmap::fromImage(*m_pQiblaImage));
    delete m_pQiblaImage;
    m_pQiblaImage=NULL;
    delete m_pPainter;
    m_pPainter =NULL;
    update(47, 33, 289, 289);

m_pQiblaImage = new QImage(QSize(289,289),QImage::Format_ARGB32_Premultiplied);
    m_pPainter = new QPainter(m_pQiblaImage);
    m_pPainter->setCompositionMode(QPainter::CompositionMode_SourceOver);
    m_pPainter->translate(144.5,144.5);
    m_pPainter->save();

    //Compass background
    QString fileName(IMAGES_PATH);
    fileName.append("compass.png");
    QImage source(fileName);
    m_pPainter->rotate(360 - angleToNorth);
    m_pPainter->drawImage(-144.5,-144.5,source);
    // m_pPainter->restore();
    //m_pPainter->save();

    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("Qibla-needle.png");
    source.load(fileName);
    m_pPainter->rotate(NormalizeTo360(m_qibla-90/*+ (360-angleToNorth)*/));
    m_pPainter->drawImage(-114.5,-20.5,source);
    // m_pPainter->restore();
    //m_pPainter->save();

    if(QTime::currentTime() < m_prayerTimes[4] && QTime::currentTime() > m_prayerTimes[1] && m_gpsMode != 2/*ON*/)
    {
        //qDebug()<<"current time is "<< QTime::currentTime();
        //qDebug()<<"prayer Time = "<<m_prayerTimes[5];
        fileName.clear();
        fileName.append(IMAGES_PATH);
        fileName.append("sun-needle.png");
        source.load(fileName);
        m_pPainter->rotate(360 - NormalizeTo360(getSunQiblaDir(m_CityInfo.longitude, m_CityInfo.latitude) * DPR)/*+(360 - angleToNorth)*/);
        m_pPainter->drawImage(-114.5,-20.5,source);
        m_pPainter->restore();
        m_pPainter->save();
    }
    else
    {
        m_pPainter->restore();
        m_pPainter->save();
    }
    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("Compass-needle.png");
    source.load(fileName);
    m_pPainter->rotate(360 - angleToNorth);
    m_pPainter->drawImage(-17.5,-106.5,source);
    m_pPainter->restore();
    m_pPainter->save();

    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("compass-center.png");
    source.load(fileName);
    m_pPainter->drawImage(-10.5,-10.5,source);
    m_pPainter->restore();
    m_pPainter->save();

    fileName.clear();
    fileName.append(IMAGES_PATH);
    fileName.append("compass-glass.png");
    source.load(fileName);
    m_pPainter->drawImage(-144.5, -144.5,source);
    m_pPainter->end();

    ui->compass->setPixmap(QPixmap::fromImage(*m_pQiblaImage));
    delete m_pQiblaImage;
    m_pQiblaImage=NULL;
    delete m_pPainter;
    m_pPainter =NULL;
    update(47, 33, 289, 289);

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and i get the follwong result

the compass image is a transparent PNG , the blue color should not be displayed because the part that contain blue color are in fact transparent so why it is displayed in blue rather than transparent?
what is wrong? please help me to find a solution to this problem

[Lykurg]

What image contains that blue color which should be transparent? Try to fill your m_pQiblaImage image with transparent "color" first. Maybe that helps.

[mismael85]

thank you very much ,now it works fine