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Thread: QwtPlotPicker picks points of whole canvas, but I need only the points on QwtPlotCurv

  1. #1
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    Default QwtPlotPicker picks points of whole canvas, but I need only the points on QwtPlotCurv

    As I'm giving the canvas of the plot, it's taking the whole canvas for mouse tracking. But how do I set it to track/show only the points of the curve?

    Qt Code:
    1. curve->setSamples(xValues, yValues, 11);
    2. curve->attach(oParamGraph);
    3.  
    4. oParamGraph->setAxisScaleDraw(QwtPlot::xBottom, new TimeScaleDraw(cpuStat.upTime()));
    5. oParamGraph->setAxisScale(QwtPlot::xBottom, 0, 165, 15);
    6. oMyPicker = new QwtPlotPicker(QwtPlot::xBottom, QwtPlot::yLeft, QwtPlotPicker::NoRubberBand, QwtPicker::AlwaysOn, oParamGraph[iCount]->canvas());
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    Thank you.
    Last edited by rawfool; 2nd May 2012 at 08:17.

  2. #2
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    Default Re: QwtPlotPicker picks points of whole canvas, but I need only the points on QwtPlot

    Overload QwtPolarPicker::trackerText and return QwtText(), when there is no point below a position. And no - QwtPolar doesn't offer an algo how to deceide this.

    Uwe

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

    rawfool (2nd May 2012)

  4. #3
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    Default Re: QwtPlotPicker picks points of whole canvas, but I need only the points on QwtPlot

    I didn't understand the following line dude.
    Quote Originally Posted by Uwe View Post
    ....., when there is no point below a position.
    Can you pls give me an example how to write condition for this.

    Thank you.

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