Create a matrix from a .csv file

mrjj

hi
I hope the above did work for you.
If yes. Next step is the structure to hold the data.


struct DataPoint {
    int x;
    int y;
    bool value;
    QColor DrawColor; // we change this from selected / not selected.
    bool isSelected; // we set this when we click on it.
};

const int max_x = 14;
const int max_y = 21;

class MatrixWidget : public QWidget
{
    Q_OBJECT
    DataPoint Data[max_x][max_y];  /// this is where we want to load the data to
public:
    explicit MatrixWidget(QWidget *parent = nullptr);

signals:


    // QWidget interface
protected:
    virtual void mousePressEvent(QMouseEvent *event) override;
    virtual void paintEvent(QPaintEvent *event) override;
};

AliM93

sorry ok i put the function

mrjj

@AliM93
Thats the Insert Option part
alt text

Default its on something else.

But no worries.

Do you have them in .h with body also like
alt text

If yes, then click on the function name and go to the refactor menu again ( or press alt+enter)
alt text
and ask it to move it to .CPP
do for both functions.

AliM93

@mrjj the code that you wrote me i have to write into .h or .cpp? into the .h i suppose
we need my previous code to read the data from csv?

mrjj

@AliM93 said in Create a matrix from a .csv file:

the code that you wrote me i have to write into .h or .cpp? into the .h i suppose
Yes the DataPoint class goes into .h as shown higher up.

we need my previous code to read the data from csv?

Yes, this has to be changed to add the values to the
DataPoint Data[max_x][max_y];
please post it.

AliM93

  csvModel = new QStandardItemModel(this);
  csvModel->setColumnCount(3);
  csvModel->setHorizontalHeaderLabels(QStringList() <<"x" <<y"" << "bool");
  ui->tableView_1->setModel(csvModel);
  
  QFile file("/home/alice/catkin_ws/src/agree_gui/resources/Punti_tappetino.csv");
  if(!file.open(QFile::ReadOnly | QFile::Text))
  {
    qDebug()<< "FIle not exist";
    
  }
  else {
    QTextStream in(&file);
    while (!in.atEnd())
    {
      QString line = in.readLine();
      QList<QStandardItem *>standardItemsList;
      for(QString item:line.split(";"))
        
    }
    csvModel ->insertRow(csvModel->rowCount(), standardItemsList);
  }
  file.close();
```this is in the .cpp file, and in the .h i put

QStandardItemsModel *csvModel;




there are also some include in the cpp :

#include <QTableView>

#include <iostream>
#include <fstream>
#include <sstream>


and om the .h

#include <QStandardItemModel>

mrjj

Hi
Super
Now we add a new function to our new class.
lets call it LoadData.

add these to the .cpp 
#include <QFile>
#include <QTextStream>
#include <QDebug>

// this is changed version of your reader code
void MatrixWidget::LoadData()
{
    QFile file("/home/alice/catkin_ws/src/agree_gui/resources/Punti_tappetino.csv");
    if (!file.open(QFile::ReadOnly | QFile::Text)) {
        qDebug() << "FIle not exist";

    } else {
        QTextStream in(&file);
        while (!in.atEnd()) {
            QString line = in.readLine();
            QStringList list = line.split(";");
            int x = list.at(0).toInt();
            int y = list.at(1).toInt();
            bool value = list.at(2).toInt();
            if ( x < max_x && y < max_y) // to make sure we dont crash
                Data[x][y].value = value; // here we store value
            else
                qDebug() << "x or y bigger than matrix!";
        }

    }
    file.close();
}

Do you follow so far ?
I have not tried this before so not sure how easy its to follow :)

AliM93

@mrjj yes i understand all the flow! super clear, so far.

mrjj

@AliM93
Super!
Could you open Punti_tappetino.csv in textEditor and copy it to say
https://paste.ofcode.org/
and give me url ?
Then i also have some real data to read it to check loaddata works :)

AliM93

@mrjj Done! are you seing it?

mrjj

@AliM93
where is the url ?

you have to press paste it and then copy the adress from the top of browser
like
https://paste.ofcode.org/vYJiPZBPqzaDNArjpqPYE7
(just test)

AliM93

@mrjj https://paste.ofcode.org/XLhSxBmaWcaKj2L9CapQ3s

sorry my bad

i have also to declare the function iLoadData in the .h file, right? in the private, protected or in the public slot?

mrjj

@AliM93
ah better :)
yes also add to public section.
we might call it from outside so its public.

AliM93

@mrjj ok! but i get some trouble with the struct. invalid use of non-static data member.

mrjj

@AliM93
can you show line where it says that ´
Mine compiles fine.

AliM93

This post is deleted!

mrjj

@AliM93
nope its not cmake

it seems you forgot the ending of the DataPoint class ?
the }; part ?

struct DataPoint {
    int x;
    int y;
    bool value;
    QColor DrawColor; // we change this from selected / not selected.
    bool isSelected; // we set this when we click on it.
};

AliM93

sorry.
solved. and now in public slot :
i add : void::Matrixwidget LoadData?

mrjj

@AliM93 said in Create a matrix from a .csv file:

void::Matrixwidget LoadData?

yes but mind the use of ::
its only use outside class so in .h its just

void LoadData();

AliM93

done! thanks, now we have to modify the paintevent in order to show the grid, right?