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Zoom Crash Bug for Qt Spectrogram

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  • Y Offline
    Y Offline
    Yippiyak
    wrote on last edited by Yippiyak
    #1

    Hello All,
    I have fixed many of the performance issues on my program, but now I am encountering a crash anytime I attempt to zoom in on the data on my spectrogram. I am using Qt Charts, and there is an exception thrown when I zoom in that says I am dividing by zero. Does anyone know what may cause this issue, or how I would go about locating the bug in my program? I am new to Qt, so bear with me.

    Joseph

    jsulmJ 1 Reply Last reply
    0
    • Y Yippiyak

      Hello All,
      I have fixed many of the performance issues on my program, but now I am encountering a crash anytime I attempt to zoom in on the data on my spectrogram. I am using Qt Charts, and there is an exception thrown when I zoom in that says I am dividing by zero. Does anyone know what may cause this issue, or how I would go about locating the bug in my program? I am new to Qt, so bear with me.

      Joseph

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @Yippiyak To locate a bug in your program you should use the debugger (from QtCreator). Also you can show the code where you do the zooming.

      https://forum.qt.io/topic/113070/qt-code-of-conduct

      Y 1 Reply Last reply
      3
      • jsulmJ jsulm

        @Yippiyak To locate a bug in your program you should use the debugger (from QtCreator). Also you can show the code where you do the zooming.

        Y Offline
        Y Offline
        Yippiyak
        wrote on last edited by Yippiyak
        #3

        @jsulm
        So I did some debugging and I figured out that this function:

        void WaterfallDisplay::resetImage()
        {
        m_image = QImage();
        }

        which was intended to reset the image upon zooming in, returns a division by zero error elsewhere in the code, as it reduces the height to 0. Any idea on a way I can reset the image, but prevent the height from getting messed up?

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          Hi,

          You can try with:

          m_image = QImage(1, 1, m_image.format());
          

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

          Y 1 Reply Last reply
          3
          • SGaistS SGaist

            Hi,

            You can try with:

            m_image = QImage(1, 1, m_image.format());
            
            Y Offline
            Y Offline
            Yippiyak
            wrote on last edited by
            #5

            @SGaist
            Youre the GOAT!
            That worked for the most part, but incase someone else stumbles upon this thread here was my final implementation:

            void WaterfallDisplay::resetImage()
            {
            m_image = QImage(m_image.width(),m_image.height(), m_image.format());
            m_image.fill(QColor(0,0,0,0));
            m_currentDrawingLine = 0;
            m_linesDrawn = 0;
            m_pastOneScreen = false;

            m_startTimer = true;
            }

            1 Reply Last reply
            1

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