Creating a chart with multiple datas

[jsulm]

@suslucoder said in Creating a chart with multiple datas:

is it true?

Of course not!
You again copy same code several times.
You already was shown how to do this correctly, I'm not going to explain the same second time...

[deleted286]

@jsulm Can you explain it please for last time :(

[jsulm]

@suslucoder No, I did it above already...

[Pl45m4]

@suslucoder

QString file("/home/ilknur/Chart/Data1.txt");
// ...
// ...
// all your files

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);
               }
           }
       }
}

Then just call this read function ones for every file you want to read (with the file path as argument)

ReadFile(file);

Or even make a QStringList with all your filenames and call this function for every element of your list.

To write "good" and clean code (OOP programming) , you'll need to stop that linear thinking (like script language). And even most of the script languages nowadays have functions, which you can define, to avoid writing the same code over and over and over again.

Doing something X times != writing it X times.
It's all about effiency (trying to avoid unnecessary things that will waste time, space and hardware ressources at runtime)

[deleted286]

@Pl45m4 where should i store

QString file("/home/ilknur/Chart/Data1.txt");
// ...
// ...
// all your files

And i have 4 different files. In this case,

QString file("/home/ilknur/FourLineChart/Data1.txt");
QString file2("/home/ilknur/FourLineChart/Data2.txt");
QString file3("/home/ilknur/FourLineChart/Data3.txt");
QString file4("/home/ilknur/FourLineChart/Data4.txt");

[Pl45m4]

@suslucoder said in Creating a chart with multiple datas:

where should i store

Do you even read what we wrote?

@Pl45m4 said in Creating a chart with multiple datas:

Then just call this read function ones for every file you want to read (with the file path as argument)
ReadFile(file);

Or even make a QStringList with all your filenames and call this function for every element of your list.

^

[deleted286]

@Pl45m4 said in

Do you even read what we wrote?

Of course. I just confused.

QString file("/home/ilknur/FourLineChart/Data1.txt");
QString file2("/home/ilknur/FourLineChart/Data2.txt");
QString file3("/home/ilknur/FourLineChart/Data3.txt");
QString file4("/home/ilknur/FourLineChart/Data4.txt");

MainWindow::MainWindow(QWidget *parent)
   : QMainWindow(parent)
   , ui(new Ui::MainWindow)
{
   ui->setupUi(this);
   CreateChart();
   ReadFile(file);
   ReadFile(file2);
   ReadFile(file3);
   ReadFile(file4);



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 miss something. But i dont know.

[jsulm]

@suslucoder I really don't understand why it is so hard! Please try to figure out such trivial things by yourself.

MainWindow::MainWindow(QWidget *parent)
   : QMainWindow(parent)
   , ui(new Ui::MainWindow)
{
   ui->setupUi(this);
   CreateChart();
   QString file("/home/ilknur/FourLineChart/Data1.txt");
   QString file2("/home/ilknur/FourLineChart/Data2.txt");
   QString file3("/home/ilknur/FourLineChart/Data3.txt");
   QString file4("/home/ilknur/FourLineChart/Data4.txt");
   ReadFile(file);
   ReadFile(file2);
   ReadFile(file3);
   ReadFile(file4);

Or shorter:

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");

[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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