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Thread: Axis problem with tiling QWTplots

  1. #1
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    Default Axis problem with tiling QWTplots

    Hello,

    I use qwt-5.2.1. I want to make a grid of graphs and to put y-axis only in the graphs on the left column and put x-axis only in the graphs on the bottom row. A picture is attached to give the idea. I have done this with Qwtplot with enableAxis and QGridLayout. However, as one can see in the picture, the size of a plot window with axes becomes smaller than that witout axis. For example, the size of the top left graph is smaller than the one on the right.

    Would there be a way to fix this without changing the code too much? If not, what is the best way to handle this?

    Thanks a lot,

    Daisuke
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  2. #2
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    Default Re: Axis problem with tiling QWTplots

    just an idea:

    Qt Code:
    1. plotWithoutAxis->setWidth(plotWithAxis->canvas()->width())
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  3. #3
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    Default Re: Axis problem with tiling QWTplots

    Thank you for the reply. Would it be possible to get a width (or size) of a canvas? canvas()->width() doesn't seem to work and I can't find a relevant member function in the document on QwtPlotCanvas class.

    Thanks,

    daisuke

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    Default Re: Axis problem with tiling QWTplots

    since QwtPlotCanvas) is inherited from QFrame, "int QFrame::frameWidth()" should do it...

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

    dtakeshita (6th December 2010)

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    Default Re: Axis problem with tiling QWTplots

    You could calculate the additional space for the left/bottom axis from the sizeHints and try to adjust the stretch factors for the first row and last column of your grid layout with it.

    But in the end better forget about the grid layout and reimplement the resize event of your container widget where you do setGeometry manually for all of your plot widgets.

    Uwe

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    Default Re: Axis problem with tiling QWTplots

    Quote Originally Posted by Uwe View Post
    reimplement the resize event of your container widget where you do setGeometry manually for all of your plot widgets.
    Uwe
    I don't have a clear idea how one could do this since I don't have a lot of eypereince with Qwt. I would appreciate if you could give me more detailed explanation.

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    Default Re: Axis problem with tiling QWTplots

    Quote Originally Posted by dtakeshita View Post
    I don't have a clear idea how one could do this since I don't have a lot of eypereince with Qwt. I would appreciate if you could give me more detailed explanation.
    This is Qt ( no Qwt ) know how. Overload the resizeEvent of the widget, where you have your QGridLayout and lay out your plot widgets manually using QWidget::setGeometry.

    Uwe

  9. The following user says thank you to Uwe for this useful post:

    dtakeshita (6th December 2010)

  10. #8
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    Default Re: Axis problem with tiling QWTplots

    Quote Originally Posted by Uwe View Post
    This is Qt ( no Qwt ) know how. Overload the resizeEvent of the widget, where you have your QGridLayout and lay out your plot widgets manually using QWidget::setGeometry.

    Uwe
    Thank you for educating me! I will look into this option.

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