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Thread: changing QLabel font size(label created on the graphicsView)

  1. #1
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    Default changing QLabel font size(label created on the graphicsView)

    HI guys,

    I have created QLabel on the QGraphicsView widget, but I can't set the font size. HEre is the code I am using, and it's not changing the font( I have a standardt (point 12) font);
    Qt Code:
    1. m_textOCOG = new QLabel(m_view->viewport());
    2. QFont font("Helvetica", 20, QFont::Bold);
    3. m_textOCOG->setFont(font);
    4. m_textOCOG->setText("COG: N A");
    5. m_textOCOG->setGeometry(452,10,100,20);
    6. m_textOCOG->setFrameStyle(QFrame::NoFrame);
    7. m_textOCOG->show();
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    Any idea? Thank you beforehand.

    Maverick
    Qt allows you to use everything you want
    wysota
    --------------------------------------------------------------------------------
    #if defined(Q_OS_UNIX) && defined(QT_DEBUG)
    abort(); // trap; generates core dump
    #else
    exit(1); // goodbye cruel world
    #endif

  2. #2
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    Default Re: changing QLabel font size(label created on the graphicsView)

    I just tested and it works for me. What does this output?
    Qt Code:
    1. QFontInfo info(font);
    2. qDebug() << info.family() << info.pointSize();
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    J-P Nurmi

  3. #3
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    Default Re: changing QLabel font size(label created on the graphicsView)

    easy question:
    What should there be included to use qDebug? Anything added to the .pro file?

    Maverick
    Qt allows you to use everything you want
    wysota
    --------------------------------------------------------------------------------
    #if defined(Q_OS_UNIX) && defined(QT_DEBUG)
    abort(); // trap; generates core dump
    #else
    exit(1); // goodbye cruel world
    #endif

  4. #4
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    Default Re: changing QLabel font size(label created on the graphicsView)

    #include <QtCore/QtDebug>
    The biggest difference between time and space is that you can't reuse time.
    -- Merrick Furst

  5. #5
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    Default Re: changing QLabel font size(label created on the graphicsView)

    "Helvetica" 20

    This is the result.

    Maverick
    Qt allows you to use everything you want
    wysota
    --------------------------------------------------------------------------------
    #if defined(Q_OS_UNIX) && defined(QT_DEBUG)
    abort(); // trap; generates core dump
    #else
    exit(1); // goodbye cruel world
    #endif

  6. #6
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    Default Re: changing QLabel font size(label created on the graphicsView)

    This is what was expected right ?
    The biggest difference between time and space is that you can't reuse time.
    -- Merrick Furst

  7. #7
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    Default Re: changing QLabel font size(label created on the graphicsView)

    This works, right?
    Qt Code:
    1. // main.cpp
    2. #include <QtGui>
    3.  
    4. int main(int argc, char *argv[])
    5. {
    6. QApplication a(argc, argv);
    7. QLabel* label = new QLabel("COG: N A", view.viewport());
    8. label->setFont(QFont("Helvetica", 20, QFont::Bold));
    9. view.show();
    10. return a.exec();
    11. }
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    J-P Nurmi

  8. #8
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    Default Re: changing QLabel font size(label created on the graphicsView)

    Yes it works . Not working in "my" view though.

    Maverick
    Qt allows you to use everything you want
    wysota
    --------------------------------------------------------------------------------
    #if defined(Q_OS_UNIX) && defined(QT_DEBUG)
    abort(); // trap; generates core dump
    #else
    exit(1); // goodbye cruel world
    #endif

  9. #9
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    Default Re: changing QLabel font size(label created on the graphicsView)

    Then, are you by any chance adjusting the font of the label anywhere else? And which other widgets do you set a font explicitly?
    J-P Nurmi

  10. The following user says thank you to jpn for this useful post:

    maverick_pol (16th August 2007)

  11. #10
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    Default Re: changing QLabel font size(label created on the graphicsView)

    I've tried changing the font size in the other "part" of the program and it works fine.
    Give me 10 minutes and I will find the stupid mistake of mine.

    All in all thank you for help.

    Maverick


    It looks like ... when I try to set the font outside the constructor it works fine. While my function setting the font is placed inside the constructor there is no "change in display" even though the qDebug says it has changed.
    Last edited by maverick_pol; 16th August 2007 at 13:59.
    Qt allows you to use everything you want
    wysota
    --------------------------------------------------------------------------------
    #if defined(Q_OS_UNIX) && defined(QT_DEBUG)
    abort(); // trap; generates core dump
    #else
    exit(1); // goodbye cruel world
    #endif

  12. #11
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    Default Re: changing QLabel font size(label created on the graphicsView)

    Are you by any chance using static or global instances of QFont ?
    The biggest difference between time and space is that you can't reuse time.
    -- Merrick Furst

  13. #12
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    Default Re: changing QLabel font size(label created on the graphicsView)

    I am using an (auto) local font object.

    Maverick
    Qt allows you to use everything you want
    wysota
    --------------------------------------------------------------------------------
    #if defined(Q_OS_UNIX) && defined(QT_DEBUG)
    abort(); // trap; generates core dump
    #else
    exit(1); // goodbye cruel world
    #endif

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