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Create a matrix from a .csv file

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  • A Offline
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    AliM93
    wrote on last edited by
    #9
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    mrjjM 1 Reply Last reply
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      AliM93
      wrote on last edited by
      #10

      I think i choose Qpainter. It's not a homework, i would like to do it on my own, but i don't even know how to save data in the bool csvData.
      https://www.tutorialspoint.com/cplusplus/cpp_multi_dimensional_arrays.htm
      i find here some explanation? can you give some hints? thanks

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      • A AliM93

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        mrjjM Offline
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        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #11

        @AliM93
        For this use case, i would also lean towards a custom widget as its quite simply requirements for the grid.
        If you had need zoom or panning, graphicsview.

        Good. Just ask if you run into issues.
        Creator has wizard to make q custom widget quite fast.
        Then you just add PaintEvent and MousePress functions.

        In paint event, you want to use the width/height() to get avialable area.
        That you use to find out the size of each point./cell/grid size.
        so that width()/14
        and Height()/21
        and you then draw each cell or point or what you want.
        You store the size of one cell as a member to use when we click.

        Then in mouse Press.
        When activated we use event->pos() to know where we click with mouse.
        We then use the CellSize we calculated in the paint to find out which cell it must be.
        and then paint it.

        To keep track of this and have the data i would use:

        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.
        }

        and have that struct in

        DataPoint Data[14][21];

        So we have both data and the color and selection status in one place.

        then we can use it like
        Data[10][10].iSSelected = true; etc
        Data[10][10].DrawColor = Qt:red;

        • but i don't even know how to save data in the bool csvData.
          Well when you read teh file, you get the x,y , right ?
          So you just use them to put value in right place.
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        • A Offline
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          AliM93
          wrote on last edited by AliM93
          #12

          Yes, i can't understand how to save into the bool csvData the right value. when i read the file i get i table view with 3 columns but i don't know how to read them in a proper manner.

          mrjjM 1 Reply Last reply
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          • A AliM93

            Yes, i can't understand how to save into the bool csvData the right value. when i read the file i get i table view with 3 columns but i don't know how to read them in a proper manner.

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by mrjj
            #13

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

            Sorry, but when you speak about qcustom widget, you mean that I have to create something from my .ui file? What i should add to show my grid to my .ui file?

            Actually its a complete new Widget that we then put on your main UI form.
            So the new Widget will contain the painting and the data and be standalone from MainWindow.
            Since we do custom painting in the widget, we dont need to give it a UI file as we dont need it here.
            Creator can make most of the code for you. Using the new Wizard.
            Or you can just type it by hand. Its just to subclass QWidget and the virtual functions.

            Yes, i can't understand how to save into the bool csvData the right value. when i read the file i get i table view with 3 columns but i don't know how to read them in a proper manner.

            But it sounds like you do spit each line to x,y, value before adding them, to the model you use for the TableView ?

            Can you show the code ?

            btw: just so you dont think a custom widget is huge work.
            its base is like

            #ifndef GRIDWIDGET_H
            #define GRIDWIDGET_H
            
            #include <QWidget>
            
            class GridWidget : public QWidget
            {
                Q_OBJECT
            public:
                explicit GridWidget(QWidget *parent = nullptr) : QWidget(parent) {}
            protected:
                virtual void paintEvent(QPaintEvent *event) override
                {
                }
                
                virtual void mousePressEvent(QMouseEvent *event) override
                {
                }
            };
            
            #endif // GRIDWIDGET_H
            
            
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            • A Offline
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              AliM93
              wrote on last edited by
              #14
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              mrjjM 1 Reply Last reply
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              • A AliM93

                This post is deleted!

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #15

                @AliM93

                Ah, yes you do split it. so right there you could stuff into the other list too.
                (line 44 first image) line is a StringList and index 0 is x, 1 is y and 2 is value , i assume.

                Actually a custom widget is perfect for use in other project as its just its .cpp and h file and if you include it, you can use it.

                Btw is the TableView and the GridWidget related ?
                it would be possible to reuse the model with your widget if you want to share the data between them but
                its more complicated.

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                  AliM93
                  wrote on 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?

                  mrjjM 1 Reply Last reply
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                  • A AliM93

                    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?

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on 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
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                    • mrjjM mrjj

                      @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
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                      AliM93
                      wrote on 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?

                      mrjjM 1 Reply Last reply
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                      • A AliM93

                        @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?

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on 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
                        
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                        • A Offline
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                          AliM93
                          wrote on last edited by AliM93
                          #20
                          This post is deleted!
                          mrjjM 1 Reply Last reply
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                          • A AliM93

                            This post is deleted!

                            mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on 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 ?

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                            • mrjjM mrjj

                              @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 ?

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                              AliM93
                              wrote on 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.

                              mrjjM 1 Reply Last reply
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                              • A AliM93

                                @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.

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on 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.

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                                • mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on 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
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                                  • mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on 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
                                    • mrjjM mrjj

                                      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 last edited by AliM93
                                      #26

                                      sorry ok i put the function

                                      mrjjM 1 Reply Last reply
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                                      • A AliM93

                                        sorry ok i put the function

                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on 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.

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                                        1
                                        • A Offline
                                          A Offline
                                          AliM93
                                          wrote on 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?

                                          mrjjM 1 Reply Last reply
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