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Thread: "Reset" panning?

  1. #1
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    Default "Reset" panning?

    Hi,

    I use both QwtPlotZoomer and QwtPlotPanner - both working very well.

    What I've noticed is that, if I do zooning, it is easy to "return"/reset to the default view using the QwtEventPattern::MouseSelect2, but I cannot find any corresponding "reset" of panning. If I have zoomed in or out and then done panning, then the QwtEventPattern::MouseSelect2 works well (it will "reset" both zooming and panning). However, if I only do panning (stay at default zoom level), then I don't know of any simple way to reset to default panning/view except if I first do zooming. Is there any kind of "one-click" reset of panning I could use which I have not found?

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    Default Re: "Reset" panning?

    No QwtPlotPanner does not store any type of history, where you can jump back and forth.

    HTH,
    Uwe

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    Default Re: "Reset" panning?

    No QwtPlotPanner does not store any type of history, where you can jump back and forth.
    Is there any feedback (signal or event) containing the new extents after a pan or zoom has occurred that would let one implement a stack to keep track of this history?

    What is the response in QwtPlotZoomer / QwtPlotPanner to a single click without mouse movement? I use this in my own graphics scenes to implement a "zoom / pan to previous level" (i.e. pop the history stack) action.
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    Default Re: "Reset" panning?

    OK, I see. But I guess it should be possible to create eg. a function or method to trigger the same thing as is done when resetting the zoom? For example, a method that zooms in one "step", and then call "reset zoom" (corresponding to QwtEventPattern::MouseSelect2), which obviously seems to work. I guess that should reset to the default axes limits, even if I have panned but not zoomed. Or is there something I'm missing?

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    Default Re: "Reset" panning?

    Maybe I shall put the question like this: Is there any way to set the axis scales to the "default" (the same scale/limits as is initially set when I first plot/show the graph) - before I do any zooming and/or panning at all?

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