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Thread: X axis tick label - font size

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    Default X axis tick label - font size

    Hi All,

    I would like to change the font size of the x axis tick label in the exmaple of "friedberg".

    Any suggestion or advice would be really appreciated.

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    Default Re: X axis tick label - font size

    Use void QwtPlot::setAxisFont ( int axisId,const QFont & f ) to set axis font.
    For different labels use your own QwtScaleDraw.
    1. Inherit from QwtScaleDraw and overload the virtual function QwtText QwtScaleDraw::label(double v) const
    2. Return the label with the type of font, size etc. from the function.
    3. Use QwtPlot::setAxisScaleDraw to set the scale for the axis in Qwtplot inherited class constructor.

  3. The following user says thank you to pkj for this useful post:

    junhonguk (26th April 2012)

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    Default Re: X axis tick label - font size

    For axis font like said pkj use QwtPlot::setAxisFont( int axisId,const QFont & f ).

    And for scale labels, use the same method as the title (it's more simple...):
    Qt Code:
    1. QwtText scaleLabel = QwtText("...");
    2. scaleLabel.setFont(...);
    3. plot->setAxisTitle(QwtPlot::yLeft, scaleLabel);
    To copy to clipboard, switch view to plain text mode 


    Added after 6 minutes:


    I have a question more general on Qwt font management:
    Why Qwt does not use a relative font definition with the QApplication::font() ?
    I think it's a more useful managment...
    Last edited by Guiom; 26th April 2012 at 14:22.

  5. The following user says thank you to Guiom for this useful post:

    junhonguk (26th April 2012)

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    Default Re: X axis tick label - font size

    Quote Originally Posted by Guiom View Post
    Why Qwt does not use a relative font definition with the QApplication::font() ?
    It does - Qwt widgets work exactly like any other widget how to find the font for drawing itsself.

    But this doesn't work when you need more than one font in one widget ( f.e QwtScaleWidget needs 2 - or even more - different fonts for title and tick labels ) or the element is no widget at all.
    But even a QLabel takes the widget font as default only, when no font is explicitely assigned - f.e embedded in rich text, where you could use different fonts for each letter.

    Uwe

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    Default Re: X axis tick label - font size

    Quote Originally Posted by Uwe View Post
    It does - Qwt widgets work exactly like any other widget how to find the font for drawing itsself.
    But in QwtPlot::initPlot the tilte is initialized with an absolute size...
    Qt Code:
    1. d_data->lblTitle->setFont( QFont( fontInfo().family(), 14, QFont::Bold ) );
    To copy to clipboard, switch view to plain text mode 

    Same in QwtPlot::initAxesData()
    Qt Code:
    1. QFont fscl( fontInfo().family(), 10 );
    2. QFont fttl( fontInfo().family(), 12, QFont::Bold )
    To copy to clipboard, switch view to plain text mode 

    If my application is defined with a font size to 8, plot title, scale label and scales are very big !!

  8. #6
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    Default Re: X axis tick label - font size

    Ah o.k - now I got what you meant.

    But whatever ( or no ) default setting is implemented - it will be overwritten in almost every application. Nobody wants to have the same fonts for titles and tick labels.
    Taking this into count I agree it might be better to do a useless, but "logical" implementation instead of trying to please a minority.

    Uwe

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