waveform code getting crashed.

[Tom44]

Hi

I have used line series to create waveform. I am using two line series one after.

code:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtCharts 2.0
Window {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")
    property var i: 0
    property var j: 0
    property var k: 0
    property var line1
    property var line2
    property var points:[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,17.5,17.8,18,18,18.1,18.15,18,17.5,17,16.5,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1]
    ChartView {
        id:myChart
        title: "Line"
        anchors.fill: parent
        antialiasing: true
        ValueAxis {
            id: xAxis
            min: 0
            max: 100;
        }

        ValueAxis {
            id: yAxis
            min: 0
            max: 50
        }

             Component.onCompleted: { line1= myChart.createSeries(ChartView.SeriesTypeLine,"series1",xAxis,yAxis)
                                      line2= myChart.createSeries(ChartView.SeriesTypeLine,"series2",xAxis,yAxis)
                                     }
    }
    Timer {
        interval: 50; running: true;
        repeat: true
        onTriggered:
        {
            i = i + 1
            if(i > 100)
            {
                i = 0
                k = 0
                if(j===0){j = 1;/*myChart.removeSeries(line2);*//*line2 = myChart.createSeries(ChartView.SeriesTypeLine,"series2",xAxis,yAxis);*/}
                else {    j = 0;/*myChart.removeSeries(line1);*//*line1 = myChart.createSeries(ChartView.SeriesTypeLine,"series1",xAxis,yAxis);*/}
            }


            if(j===1)
            {

            if(k === points.length){k=0}
            line1.remove(0)
            line2.append(i,points[k])
                k++;

            }
            else{
                if(k === points.length){k=0}

            line2.remove(0)
            line1.append(i,points[k])
                k++;
            }
        }
    }
}

It runs for some time and gets crashed probably due to append() api.
How can I solve this?

[koahnig]

@Tom44

Do you run the app in Qt creator with debugger?
If not, this would be definitely the next step to try.

Also you can use https://doc.qt.io/qt-5/qtquick-debugging.html . The output shall be shown in the Application output pane of creator.

Which OS are you on?
Is the application also compiled for that OS?

[Tom44]

Hi @koahnig
Thanks for help!!
Problem is solved

This problem was due to remove(0).