display QImage on QLabel

[akasi]

Hi! I am trying to display image on the label:

Creating the image:

static const QRgb s_rgnColors[256] = 
    { 
        (unsigned int)0x000000,
        (unsigned int)0xFF0000,
        (unsigned int)0x00FF00,
        (unsigned int)0xFFFF00,
        (unsigned int)0x0000FF,
        (unsigned int)0xFF00FF,
        (unsigned int)0x00FFFF,
        (unsigned int)0xFFFFFF,
 
        // TODO: think about other colors
        (unsigned int)0x000000 
 
    };
 
QImage *m_imageFloor = new QImage(nWidth, nHeight, QImage::Format_Indexed8);
m_imageFloor->setColorTable(QVector<QRgb>::fromStdVector(
            std::vector<QRgb>(s_rgnColors, s_rgnColors + _countof(s_rgnColors)))
                        );
m_imageFloor->fill(7);

static const QRgb s_rgnColors[256] = 
    { 
        (unsigned int)0x000000,
        (unsigned int)0xFF0000,
        (unsigned int)0x00FF00,
        (unsigned int)0xFFFF00,
        (unsigned int)0x0000FF,
        (unsigned int)0xFF00FF,
        (unsigned int)0x00FFFF,
        (unsigned int)0xFFFFFF,

        // TODO: think about other colors
        (unsigned int)0x000000 

    };

QImage *m_imageFloor = new QImage(nWidth, nHeight, QImage::Format_Indexed8);
m_imageFloor->setColorTable(QVector<QRgb>::fromStdVector(
            std::vector<QRgb>(s_rgnColors, s_rgnColors + _countof(s_rgnColors)))
                        );
m_imageFloor->fill(7);

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and showing it on the label

m_labelFloorPlan = new QLabel();    
m_labelFloorPlan->setSizePolicy(QSizePolicy::Expanding,
                                    QSizePolicy::Expanding);
m_labelFloorPlan->setAlignment(Qt::AlignCenter);
m_labelFloorPlan->setMinimumSize(400, 400);
m_labelFloorPlan->setPixmap(QPixmap::fromImage(*m_imageFloor, Qt::AutoColor));
setCentralWidget(m_labelFloorPlan);

m_labelFloorPlan = new QLabel();    
m_labelFloorPlan->setSizePolicy(QSizePolicy::Expanding,
                                    QSizePolicy::Expanding);
m_labelFloorPlan->setAlignment(Qt::AlignCenter);
m_labelFloorPlan->setMinimumSize(400, 400);
m_labelFloorPlan->setPixmap(QPixmap::fromImage(*m_imageFloor, Qt::AutoColor));
setCentralWidget(m_labelFloorPlan);

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But the image does not appear
What am I doing wrong??

Thank you.

[jpn]

#include <QtGui>
 
static const QVector<QRgb> colors = QVector<QRgb>()
        << qRgb(  0,   0,   0)
        << qRgb(255,   0,   0)
        << qRgb(  0, 255,   0)
        << qRgb(255, 255,   0)
        << qRgb(  0,   0, 255)
        << qRgb(255,   0, 255)
        << qRgb(  0, 255, 255)
        << qRgb(255, 255, 255);
 
int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
 
    QImage image(320, 240, QImage::Format_Indexed8);
    image.setColorTable(colors);
    image.fill(2);
 
    QLabel label;
    label.setPixmap(QPixmap::fromImage(image));
    label.show();
 
    return app.exec();
}

#include <QtGui>

static const QVector<QRgb> colors = QVector<QRgb>()
        << qRgb(  0,   0,   0)
        << qRgb(255,   0,   0)
        << qRgb(  0, 255,   0)
        << qRgb(255, 255,   0)
        << qRgb(  0,   0, 255)
        << qRgb(255,   0, 255)
        << qRgb(  0, 255, 255)
        << qRgb(255, 255, 255);

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);

    QImage image(320, 240, QImage::Format_Indexed8);
    image.setColorTable(colors);
    image.fill(2);

    QLabel label;
    label.setPixmap(QPixmap::fromImage(image));
    label.show();

    return app.exec();
}

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[akasi]

thank you for your answer but I still do not understand where is the problem in my code..
one more question:
why I cannot paint on the image which was created as QImage::Format_Indexed8
here is the example:

m_pImageFloor = new QImage(nWidth, nHeight, QImage::Format_Indexed8);
	m_pImageFloor->setColorTable(s_rgnColors);
	m_pImageFloor->fill(0);
 
	QBrush brush(Qt::SolidPattern);  
	brush.setColor(Qt::darkGreen);
	QPainter painter(m_pImageFloor);
	painter.fillRect(0, 0, nWidth, nHeight, brush);

m_pImageFloor = new QImage(nWidth, nHeight, QImage::Format_Indexed8);
	m_pImageFloor->setColorTable(s_rgnColors);
	m_pImageFloor->fill(0);
	
	QBrush brush(Qt::SolidPattern);  
	brush.setColor(Qt::darkGreen);
	QPainter painter(m_pImageFloor);
	painter.fillRect(0, 0, nWidth, nHeight, brush);

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the painter does not become active..
thanks