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Thread: QwtPolarMagnifier Window not responding

  1. #1
    Join Date
    Jun 2018
    Bangalore, India
    Qt products
    Qt3 Qt4 Qt5 Qt/Embedded
    Unix/X11 Windows

    Default QwtPolarMagnifier Window not responding

    I am using QwtPolarMagnifier for zooming in on my plot. As I am getting a huge amount of data through Wifi, my window keeps getting slower and there is lagging while zooming. I have implemented the QwtPolarMagnifier exactly as the polardemo example. I have threading for some of the processes. AS i cannot remove any objects from main screen. Can you help me find a way to zoom better?

    I also saw about QwtPlotZoomer which has a maximum stack depth. Is there anything like that in QwtPolarMagnifier?

  2. #2
    Join Date
    Feb 2006
    Munich, Germany
    Thanked 860 Times in 809 Posts
    Qt products
    Qt3 Qt4 Qt/Embedded
    MacOS X Unix/X11 Windows

    Default Re: QwtPolarMagnifier Window not responding

    The magnifier is a type of zooming, that does not work pretty well with slow replot operations.
    So you have to speed up your replot operation or use a different type of zooming - like f.e. introducing +/- buttons.


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

    Uwe Yashwanth (9th July 2018)

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