Chart cannot read datas from txt

[deleted286]

It will create a chart, but there is no data on it. Datas on my txt cannot seen on chart. How can I handle with it? Do I use another timer or am i wrong any other part of it?

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFile>
#include <QtCharts/QLineSeries>
#include <QTimer>
#include <QTextStream>
#include <QtCharts>
#include <QChart>
#include <QString>



QT_CHARTS_USE_NAMESPACE

using namespace QtCharts;



QLineSeries *series = new QLineSeries();
QTimer *timer = new QTimer();

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
  connect(timer, SIGNAL(timeout()), SLOT(Timer_Slot()));

    initChartView();

}

void MainWindow::Timer_Slot(){
    QString line = allLines[curIndex];
    ui->plainTextEdit->setPlainText(line);
    if(curIndex < allLines.size() -1 ) {
        curIndex++;
    }
}


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


void MainWindow::on_pushButton_clicked()
{

    QFile file("C:/Users/ilknu/Documents/SnDeneme/deneme.txt");

    if (file.open(QIODevice::ReadOnly)) {
          QTextStream in (&file);
          while (!in.atEnd()) {
          QString line = in.readLine();
          allLines.append(line);

      QStringList list = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
            for(const QString &entry : list) {
            double num = entry.toDouble();
            qDebug()<<num;
                 series->append(num, num);
                }



            }
            }
    file.close();
    curIndex=0;
    timer->start(300);
}

void MainWindow::initChartView(){



   QChart *chart = new QChart();
      chart->addSeries(series);
      chart->legend()->hide();
      chart->setTitle("deneme");

      QValueAxis *axisX = new QValueAxis();
      axisX->setTitleText("Points");
      axisX->setLabelFormat("yyyy");
      axisX->setTickCount(series->count());
      chart->addAxis(axisX, Qt::AlignBottom);
      series->attachAxis(axisX);

      QLogValueAxis *axisY = new QLogValueAxis();
      axisY->setTitleText("Values");
      axisY->setLabelFormat("%i");
      axisY->setBase(8);
      chart->addAxis(axisY, Qt::AlignLeft);
      series->attachAxis(axisY);

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

      connect(series, &QLineSeries::hovered, this, &MainWindow::on_pushButton_clicked);
      this->setCentralWidget(chartView);

}

[jsulm]

@suslucoder said in Chart cannot read datas from txt:

qDebug()<<num;
series->append(num, num);
}

And where in your code do you add series to the chart?!

[deleted286]

@jsulm chart->addSeries(series);

is it wrong?

[jsulm]

@suslucoder said in Chart cannot read datas from txt:

chart->addSeries(series);

I think you need to do this after populating series with your data from the file.

[deleted286]

@jsulm for doing it chart should be declared globally. When i declared it global, it causes a crash . any options?

[jsulm]

@suslucoder said in Chart cannot read datas from txt:

chart should be declared globally

Why do you think so?
You just need to declare QChart *chart as member variable instead of a local variable in initChartView()...

[deleted286]

@jsulm you mean in header file, right?

[jsulm]

@suslucoder Yes, inside your class declaration as private member variable...

[deleted286]

@jsulm I've tried. It says Series not in the chart. Please addSeries to chart first.