Creating a chart with multiple datas

[deleted286]

@jsulm said in Creating a chart with multiple datas:

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
CreateChart();
ReadFile("/home/ilknur/FourLineChart/Data1.txt");
ReadFile("/home/ilknur/FourLineChart/Data2.txt");
ReadFile("/home/ilknur/FourLineChart/Data3.txt");
ReadFile("/home/ilknur/FourLineChart/Data4.txt");

I've do it in that way and i have

void MainWindow::ReadFile(QString file)
{
       QFile(file);

       if(file.open(QIODevice::ReadOnly))
       {
           QTextStream in(&file);
           while (!in.atEnd()) {
               QString line = in.readLine();
               QStringList list = line.split(QLatin1Char(' '), QString::SkipEmptyParts);
               for (const QString &entry : list)
               {
                   double num = entry.toDouble();
                   qDebug() << num;
                    // pick correct queue here
                   queue.enqueue(num);
               }
           }
       }
}

I've got a lot of errors:

: In member function ‘void MainWindow::ReadFile(QString)’:
: error: declaration of ‘QFile file’ shadows a parameter
error: declaration of ‘QFile file’ shadows a parameter
QFile(file);
^

[jsulm]

@suslucoder said in Creating a chart with multiple datas:

QFile(file);

Again easy to fix:

void MainWindow::ReadFile(QString filePath)
{
       QFile file(filePath);

       if(file.open(QIODevice::ReadOnly))

[deleted286]

@jsulm okey. We did it in that way. But i have

void MainWindow::Timer_Slot()
{
    static float q_x=0;
    static float q_x2=0;
    static float q_x3=0;
    static float q_x4=0;

    if(!queue.isEmpty())
        {
           double num=queue.dequeue();
           q_x += 0.1;
           series->append(q_x, num);
           chart->scroll(10, 0);
           chart->update();
           qDebug() << q_x << num;

        }
    if(!queue2.isEmpty())
        {
           double num2=queue2.dequeue();
           q_x2 += 0.1;
           series2->append(q_x2, num2);
           chart->scroll(10, 0);
           chart->update();
           qDebug() << q_x2 << num2;


        }
    if(!queue3.isEmpty())
        {
           double num3=queue3.dequeue();
           q_x3 += 0.1;
           series3->append(q_x3, num3);
           chart->scroll(10, 0);
           chart->update();
        }

    if(!queue4.isEmpty())
        {
           double num4=queue4.dequeue();
           q_x4 += 0.1;
           series4->append(q_x4, num4);
           chart->scroll(10, 0);
           chart->update();
        }
}

What will happen my other queues, in ReadFile() ?

[jsulm]

@suslucoder said in Creating a chart with multiple datas:

What will happen my other queues, in ReadFile() ?

Can't you simply use one queue?
If not then extend the readFile() method:

void MainWindow::ReadFile(const QString &file, QQueue<double> &queue)
{
...

And pass queue as second parameter.

[deleted286]

@jsulm said in Creating a chart with multiple datas:

Can't you simply use one queue?

When i use one queue, how can i differ my datas?
Txt files have different values, and i will show all of them in a line chart with different color

[jsulm]

@suslucoder Then do like I suggested:

void MainWindow::ReadFile(const QString &file, QQueue<double> &queue)
{
...
}
...
ReadFile("/home/ilknur/FourLineChart/Data1.txt", queue);
ReadFile("/home/ilknur/FourLineChart/Data2.txt", queue1);
ReadFile("/home/ilknur/FourLineChart/Data3.txt", queue2);
ReadFile("/home/ilknur/FourLineChart/Data4.txt", queue3);

[deleted286]

@jsulm in .h file i have

 ```
 QQueue<double> queue;
 QQueue<double> queue2;
 QQueue<double> queue3;
 QQueue<double> queue4;

Should i delete them?

[jsulm]

@suslucoder said in Creating a chart with multiple datas:

Should i delete them?

No. Why would you?

[deleted286]

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