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Create a matrix from a .csv file

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  • A Offline
    A Offline
    AliM93
    wrote on 30 May 2020, 22:16 last edited by AliM93
    #16

    No the tableview was just a check for me, but i don't have to use it. i just want to show the data in a grid and that's all.
    i declare it as a QString, is the same of e StringList? yes the order it's like that anyway

    So i have to add a file.h and file.cpp or i can work on this?

    M 1 Reply Last reply 30 May 2020, 22:25
    0
    • A AliM93
      30 May 2020, 22:16

      No the tableview was just a check for me, but i don't have to use it. i just want to show the data in a grid and that's all.
      i declare it as a QString, is the same of e StringList? yes the order it's like that anyway

      So i have to add a file.h and file.cpp or i can work on this?

      M Offline
      M Offline
      mrjj
      Lifetime Qt Champion
      wrote on 30 May 2020, 22:25 last edited by mrjj
      #17

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

      No the tableview was just a check for me, but i don't have to use it. i just want to show the data in a grid and that's all.
      i declare it as a QString, is the same of e StringList? yes the order it's like that anyway

      Ok, just asking as using a model allows to share data views which is super nice if one needs to be able to edit it and have it reflected at once in some other view. But if you just use it to show data and dont want to edit it. then i would just use
      some small structure to all data needed for the grid display.

      So i have to add a file.h and file.cpp or i can work on this?

      You mean if you can use Matrix class for this custom widget ?
      Yes, but its a QDialog so not perfect fit. ( unless you always want the Grid to popup over the main window)

      A 1 Reply Last reply 30 May 2020, 22:30
      1
      • M mrjj
        30 May 2020, 22:25

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

        No the tableview was just a check for me, but i don't have to use it. i just want to show the data in a grid and that's all.
        i declare it as a QString, is the same of e StringList? yes the order it's like that anyway

        Ok, just asking as using a model allows to share data views which is super nice if one needs to be able to edit it and have it reflected at once in some other view. But if you just use it to show data and dont want to edit it. then i would just use
        some small structure to all data needed for the grid display.

        So i have to add a file.h and file.cpp or i can work on this?

        You mean if you can use Matrix class for this custom widget ?
        Yes, but its a QDialog so not perfect fit. ( unless you always want the Grid to popup over the main window)

        A Offline
        A Offline
        AliM93
        wrote on 30 May 2020, 22:30 last edited by AliM93
        #18

        @mrjj from the main_window a open all the other window. and the matrix is a part of another QDialog. now i splith things in order to understand what i have to do but then i have to embed this as a part o QDaialog window. maybe afert a pushbutton clicked i open my grid, the user select and then push another button and i return to my previous GUI with point selected saved.

        So what i have to do now is to add a customgrid.h customgrid.cpp, but what i have to select? to add? if it is not a dialog? a cpp headers and cpp source file separately? or a cpp class?

        M 1 Reply Last reply 30 May 2020, 22:35
        0
        • A AliM93
          30 May 2020, 22:30

          @mrjj from the main_window a open all the other window. and the matrix is a part of another QDialog. now i splith things in order to understand what i have to do but then i have to embed this as a part o QDaialog window. maybe afert a pushbutton clicked i open my grid, the user select and then push another button and i return to my previous GUI with point selected saved.

          So what i have to do now is to add a customgrid.h customgrid.cpp, but what i have to select? to add? if it is not a dialog? a cpp headers and cpp source file separately? or a cpp class?

          M Offline
          M Offline
          mrjj
          Lifetime Qt Champion
          wrote on 30 May 2020, 22:35 last edited by
          #19

          @AliM93
          Hi
          Well if you want to pop it up anyway, you could leave it as QDialog and draw directly to it but
          could be more handy if it was standalone and you would add it to a QDialog but this is not critical.

          well you just inherit QWidget instead of QDialog and change in cpp where it calls base in constructor.
          xxx) : QDialog(parent) {} -> ) : QWidget(parent) {}

          class GridWidget : public QWidget
          
          1 Reply Last reply
          1
          • A Offline
            A Offline
            AliM93
            wrote on 30 May 2020, 22:43 last edited by AliM93
            #20
            This post is deleted!
            M 1 Reply Last reply 30 May 2020, 22:50
            0
            • A AliM93
              30 May 2020, 22:43

              This post is deleted!

              M Offline
              M Offline
              mrjj
              Lifetime Qt Champion
              wrote on 30 May 2020, 22:50 last edited by
              #21

              @AliM93
              Ah sorry my bad.
              You have an UI file with it and inside that it says its still a QDialog so that what it complains about
              So you must open that UI in text editor and change type ( Creator should be close)
              or remove that it has one.
              That is matrix.h line 23
              and also the setupUI thing and the ui thing line 20

              Its hard to show when you use images for code.

              So do you need UI file ?
              To add other widgets on top of grid ?

              A 1 Reply Last reply 30 May 2020, 22:54
              0
              • M mrjj
                30 May 2020, 22:50

                @AliM93
                Ah sorry my bad.
                You have an UI file with it and inside that it says its still a QDialog so that what it complains about
                So you must open that UI in text editor and change type ( Creator should be close)
                or remove that it has one.
                That is matrix.h line 23
                and also the setupUI thing and the ui thing line 20

                Its hard to show when you use images for code.

                So do you need UI file ?
                To add other widgets on top of grid ?

                A Offline
                A Offline
                AliM93
                wrote on 30 May 2020, 22:54 last edited by
                #22

                @mrjj what if i do from new? maybe more clear for me to learn something. and sorry fro the images, up to now i will paste the code.

                M 1 Reply Last reply 30 May 2020, 22:57
                0
                • A AliM93
                  30 May 2020, 22:54

                  @mrjj what if i do from new? maybe more clear for me to learn something. and sorry fro the images, up to now i will paste the code.

                  M Offline
                  M Offline
                  mrjj
                  Lifetime Qt Champion
                  wrote on 30 May 2020, 22:57 last edited by
                  #23

                  @AliM93
                  Yes lets do a clean widget. I think its good to learn as Creator can really help in this.
                  give me 5. ill make some shots.

                  1 Reply Last reply
                  1
                  • M Offline
                    M Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on 30 May 2020, 23:08 last edited by mrjj
                    #24

                    1:
                    alt text
                    Choose New file or Project

                    2:
                    alt text
                    Select C++ class

                    3:
                    Give it a name and set base class to Qwidget
                    alt text

                    press NEXT, and then next again.

                    4:
                    we now have the new class and its cpp and .h added to the project
                    alt text

                    Lets add PaintEvent and MousePress

                    Right click the name of the class in the .h file (MatrixWidget)
                    and select the Refactor menu and add virtual function
                    alt text

                    Now type Paint in top
                    and check the paintEvent function
                    make sure the Insert option is as shown

                    alt text

                    Dont press OK yet!

                    now type Press in top (where you had paint)
                    and find the MousePress function and check that.

                    Now Press ok.

                    Then we are back to the code with our new functions.
                    alt text

                    Press F4 to switch to cpp file and see it has given you the bodies also.

                    alt text

                    Now you made your custom widget. ( it might seems a lot first time, but its very fast when used to it :)

                    So next part is to add code to paintEvent to draw something.
                    We also need your old reader code to get the data and stuff into our structure.

                    A 1 Reply Last reply 30 May 2020, 23:21
                    0
                    • M Offline
                      M Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on 30 May 2020, 23:14 last edited by
                      #25

                      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;
                      };
                      
                      1 Reply Last reply
                      1
                      • M mrjj
                        30 May 2020, 23:08

                        1:
                        alt text
                        Choose New file or Project

                        2:
                        alt text
                        Select C++ class

                        3:
                        Give it a name and set base class to Qwidget
                        alt text

                        press NEXT, and then next again.

                        4:
                        we now have the new class and its cpp and .h added to the project
                        alt text

                        Lets add PaintEvent and MousePress

                        Right click the name of the class in the .h file (MatrixWidget)
                        and select the Refactor menu and add virtual function
                        alt text

                        Now type Paint in top
                        and check the paintEvent function
                        make sure the Insert option is as shown

                        alt text

                        Dont press OK yet!

                        now type Press in top (where you had paint)
                        and find the MousePress function and check that.

                        Now Press ok.

                        Then we are back to the code with our new functions.
                        alt text

                        Press F4 to switch to cpp file and see it has given you the bodies also.

                        alt text

                        Now you made your custom widget. ( it might seems a lot first time, but its very fast when used to it :)

                        So next part is to add code to paintEvent to draw something.
                        We also need your old reader code to get the data and stuff into our structure.

                        A Offline
                        A Offline
                        AliM93
                        wrote on 30 May 2020, 23:21 last edited by AliM93
                        #26

                        sorry ok i put the function

                        M 1 Reply Last reply 30 May 2020, 23:25
                        0
                        • A AliM93
                          30 May 2020, 23:21

                          sorry ok i put the function

                          M Offline
                          M Offline
                          mrjj
                          Lifetime Qt Champion
                          wrote on 30 May 2020, 23:25 last edited by
                          #27

                          @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.

                          1 Reply Last reply
                          1
                          • A Offline
                            A Offline
                            AliM93
                            wrote on 30 May 2020, 23:27 last edited by AliM93
                            #28

                            @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?

                            M 1 Reply Last reply 30 May 2020, 23:36
                            0
                            • A AliM93
                              30 May 2020, 23:27

                              @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?

                              M Offline
                              M Offline
                              mrjj
                              Lifetime Qt Champion
                              wrote on 30 May 2020, 23:36 last edited by
                              #29

                              @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.

                              1 Reply Last reply
                              0
                              • A Offline
                                A Offline
                                AliM93
                                wrote on 30 May 2020, 23:47 last edited by AliM93
                                #30
                                  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>

                                1 Reply Last reply
                                0
                                • M Offline
                                  M Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on 30 May 2020, 23:54 last edited by mrjj
                                  #31

                                  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 :)

                                  A 1 Reply Last reply 30 May 2020, 23:56
                                  1
                                  • M mrjj
                                    30 May 2020, 23:54

                                    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 :)

                                    A Offline
                                    A Offline
                                    AliM93
                                    wrote on 30 May 2020, 23:56 last edited by AliM93
                                    #32

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

                                    M 1 Reply Last reply 31 May 2020, 00:02
                                    0
                                    • A AliM93
                                      30 May 2020, 23:56

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

                                      M Offline
                                      M Offline
                                      mrjj
                                      Lifetime Qt Champion
                                      wrote on 31 May 2020, 00:02 last edited by
                                      #33

                                      @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 :)

                                      A 1 Reply Last reply 31 May 2020, 00:04
                                      1
                                      • M mrjj
                                        31 May 2020, 00:02

                                        @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 :)

                                        A Offline
                                        A Offline
                                        AliM93
                                        wrote on 31 May 2020, 00:04 last edited by
                                        #34

                                        @mrjj Done! are you seing it?

                                        M 1 Reply Last reply 31 May 2020, 00:05
                                        0
                                        • A AliM93
                                          31 May 2020, 00:04

                                          @mrjj Done! are you seing it?

                                          M Offline
                                          M Offline
                                          mrjj
                                          Lifetime Qt Champion
                                          wrote on 31 May 2020, 00:05 last edited by mrjj
                                          #35

                                          @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)

                                          A 1 Reply Last reply 31 May 2020, 00:07
                                          1

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