QtCharts::QLineSeries(0x2ea7560, There is no data on chart

[deleted286]

It isnt add queue datas into chart, error says QtCharts::QLineSeries(0x2ea7560)
Where is my mistake?

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtCore>
#include <QMainWindow>
#include <QtWidgets/QMainWindow>
#include <QtCharts>
#include <QChart>

QT_CHARTS_USE_NAMESPACE
using namespace QtCharts;


MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    initChartView();
    connect(m_timer, SIGNAL(timeout()), SLOT(Timer_Slot()));
    m_timer->setInterval(500);
    m_timer->start();

    myThreadObject = new mythread();
    myQThread = new QThread();

    myThreadObject->moveToThread(myQThread);

    connect(this, &MainWindow::startWriting, myThreadObject, &mythread::writeData);
    connect(myThreadObject, &mythread::writingDone, this, &MainWindow::writingDoneByThread);
    connect(myThreadObject, &mythread::mysignal, this, &MainWindow::myslot);
    // Start the new thread
    myQThread->start();
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::Timer_Slot()
{
    static float q_x;
    if(!queue.isEmpty())
    {
        double num=queue.dequeue();
        q_x += 0.1;
        series->append(q_x, num);
        qDebug() << "this is qx " << q_x;
        qDebug() << "this is num " << num;
        chart->update();

    }
}

void MainWindow::initChartView()
{
    QChart *chart = new QChart();
    chart->ChartTypeCartesian;
    chart->addSeries(series);
    qDebug()<< series;
    QPen green(Qt::red);
    green.setWidth(2);
    series->setPen(green);
    chart->legend()->hide();
    chart->setTitle("deneme");
    chart->setAnimationOptions(QChart::AllAnimations);

    QValueAxis *axisX=new QValueAxis;
    axisX->setTickCount(10);
    axisX->setRange(0,5);
    axisX->applyNiceNumbers();
    chart->addAxis(axisX, Qt::AlignBottom);
    series->attachAxis(axisX);

    QValueAxis *axisY = new QValueAxis;
    axisY->setTickCount(10);
    axisY->setRange(0, 5);
    axisY->applyNiceNumbers();
    chart->addAxis(axisY, Qt::AlignLeft);
    series->attachAxis(axisY);

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
    this->setCentralWidget(chartView);
}

mainwindow.h

#include <QLineSeries>

QT_CHARTS_USE_NAMESPACE

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = Q_NULLPTR);
    ~MainWindow();

    void initChartView();
private:
    Ui::MainWindow *ui;
    mythread* myThreadObject;    //mythreadden yeni bir obje yaratıyorum
    QThread* myQThread;  //QThreadden bir obje yaratıyorum
    QChart *chart = new QChart();
    QLineSeries *series = new QLineSeries();
    QQueue<double> queue;
    QTimer *m_timer = new QTimer();
signals:
    void startWriting();
public slots:
    void writingDoneByThread();
    void myslot( QQueue<double>queue );

private slots:
    void Timer_Slot();

};
#endif // MAINWINDOW_H
```![0e547d28-f395-49f1-a5d0-17fddb2a2994-image.png](https://ddgobkiprc33d.cloudfront.net/8aa80dba-7f9d-41aa-9616-c709610d8c52.png)

[jsulm]

@suslucoder Did you debug your app to find out whether your queue is actually filled with data?! Or do you want us to debug your code?

[mrjj]

Hi
I cant see what you do in myslot ?

[JonB]

@suslucoder said in QtCharts::QLineSeries(0x2ea7560, There is no data on chart:

error says QtCharts::QLineSeries(0x2ea7560)

What "error"?

qDebug()<< series;

Maybe QtCharts::QLineSeries(0x2ea7560) is what that prints when you ask it to print a QLineSeries *? Since it is a pointer, maybe you intended to go qDebug()<< *series;?