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Thread: Map QwtPlotMagnifier to a button

  1. #1
    Join Date
    Jul 2009
    Posts
    4
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    Default Map QwtPlotMagnifier to a button

    Hey guys,

    I have a QwtPlotMagnifier object that I can control fine with the scroll wheel of a mouse, however I want to implement 2 QPushButton's (for zoom in and zoom out) and control the zooming from here.

    Any ideas on how I can achieve this?

  2. #2
    Join Date
    Jul 2009
    Posts
    4
    Qt products
    Qt4
    Platforms
    Unix/X11 Windows

    Default Re: Map QwtPlotMagnifier to a button

    Just posting for anyone who's trying to achieve the same thing, I came up with a solution when I had another look at it (it pretty obvious actually).

    I simply subclassed the QwtPlotMagnifier class, and then used the rescale() function.

    I then create two slots as below, and then connected them to a toggled() signal.

    Qt Code:
    1. // Zoom in
    2. void MyPlotZoom::zoomIn(void)
    3. {
    4. QwtPlotMagnifier::rescale(0.8);
    5. }
    6.  
    7. // Zoom out
    8. void MyPlotZoom::zoomOut(void)
    9. {
    10. QwtPlotMagnifier::rescale(1.2);
    11. }
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