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Create a matrix from a .csv file

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  • A Offline
    A Offline
    AliM93
    wrote on last edited by
    #126

    sorry! now i have, i lost a part of that version of matrix, sorry!

    mrjjM 1 Reply Last reply
    0
    • A AliM93

      sorry! now i have, i lost a part of that version of matrix, sorry!

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #127

      @AliM93
      Ok that good news as it would be very impossible that numbers went missing :)

      what is remaining is the click logic and to actual draw the 1.

      how shall we draw 0 ones ?
      just no value in cell and cant be selected or what is the goal?

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      • A Offline
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        AliM93
        wrote on last edited by
        #128

        my idea was to color all the 1s in green and the 0s in gray. so the user know that can select only the green cells, is it possible?

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        • A Offline
          A Offline
          AliM93
          wrote on last edited by
          #129

          i don't want to disturb you anymore tonight, if you want and if you have time we can continue tomorrow

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          • mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #130

            Yes its possible. we can paint it any way we like. teasers included.

            Well im getting very tired as 4.20 in the morning is late for me even i do love programming at night.

            Tomorrow we add the last part. It's not that much. Promise.
            You did good. First custom widget is always a bit tuff.

            alt text

            alt text

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            • A Offline
              A Offline
              AliM93
              wrote on last edited by
              #131

              thank you so much! you help me a lot also in understand the ideas. thanks. night!

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              • mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #132

                Hi
                The last remaining steps are to
                +Add box width/height as members to use when clicking and a variable to keep track of the number of selected

                class MatrixWidget : public QWidget
                {....    
                    int bw =0;
                    int bh =0;
                    int selCount=0; // to make sure we can only select 3
                ,...
                

                +call loadData from construtor.

                +Set some colors in void MatrixWidget::LoadData()
                for 0 cells and 1 cells (see code)

                +Add selection logic to mousePress

                void MatrixWidget::mousePressEvent(QMouseEvent *event)
                {
                    QPoint p = event->pos(); // where we clicked
                
                    int xindex =  p.x() / bw;
                    int yindex =  p.y() / bh;
                
                    qDebug() << xindex << " " << yindex;
                    // get the data point ( we should check index is not outside array...)
                    DataPoint &dp = Data[xindex + 1 ][yindex + 1]; 
                
                    // value zero cannot be selected
                    if ( dp.value == 0 ) return;
                
                    // selection logic. If not already selected, select it and set color. Else deselect and reset color
                    if ( dp.isSelected == false) {
                
                        // no more than 3 selected ( 0,1,2 )
                        if ( selCount > 2 ) return;
                
                        dp.DrawColor = Qt::blue;
                        dp.isSelected = true;
                        selCount++; // extra selected
                    } else {
                        dp.DrawColor =  Qt::green;
                        dp.isSelected = false;
                        selCount--; // less selected
                    }
                    update(); // tell it to redraw grid
                
                }
                
                

                +Adjust draw to skip 0,0 as we don't use it but the array must start at zero.

                void MatrixWidget::paintEvent(QPaintEvent *event)
                {
                
                    QPainter p(this);
                    // draw frame.
                    p.drawRect(0, 0, width() - 1, height() - 1);
                
                    // size of area we have. w = width , h = height , we take 2 pixles for border
                    int w = width() - 2;
                    int h = height() - 2;
                
                    // now we find out how big each box should be which area we have  divided with how many on x and y
                    bw = w / max_x;
                    bh = h / max_y;
                
                    // now we loop and draw the boxes. we dont use the boxes from 0,0 as data starts with 1,1
                    for (int xi = 0; xi < max_x - 1; ++xi) {
                        for (int yi = 0; yi < max_x - 1; ++yi) {
                            p.setBrush(QBrush( Data[xi + 1][yi + 1].DrawColor )); // +1 as we dont want to use from 0,0
                            QRect cellRect( xi * bw, yi * bh, bw, bh  );
                            p.drawRect( cellRect );
                            // show x,y . just for debug
                            p.drawText( cellRect ,
                                       QString::number(xi + 1) + "," +
                                       QString::number(yi +1) );
                
                        }
                    }
                }
                
                
                

                Then we have a working version.

                alt text

                project
                https://www.dropbox.com/s/z4nllgag1tjy4j3/GridWidgetApp.zip?dl=0

                Things to improve/add
                The limit of how many points user can select,
                should be a parameter to the class so it can be set to anything and not a fixed value.

                The colors could also be parameters ( for not selectable, selectable and selected)

                Add a function to return the selected data pointsby looping the Data list and check isSelected.

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                • A Offline
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                  AliM93
                  wrote on last edited by AliM93
                  #133

                  thanks! i'll do it step by step, i quite understand it, but when i run i got a black grid, and the error floating point exeption (core dumped) No more error, (i also see the coordinates in the debug), but black grid.

                  mrjjM 1 Reply Last reply
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                  • A AliM93

                    thanks! i'll do it step by step, i quite understand it, but when i run i got a black grid, and the error floating point exeption (core dumped) No more error, (i also see the coordinates in the debug), but black grid.

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #134

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

                    it, but when i run i got a black grid, and the error floating point exeption (core dumped)

                    In my project or yours ?

                    A 1 Reply Last reply
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                    • mrjjM mrjj

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

                      it, but when i run i got a black grid, and the error floating point exeption (core dumped)

                      In my project or yours ?

                      A Offline
                      A Offline
                      AliM93
                      wrote on last edited by
                      #135

                      @mrjj in mine

                      mrjjM 1 Reply Last reply
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                      • A AliM93

                        @mrjj in mine

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #136

                        @AliM93

                        Ok, i would guess that you forgot something from the maxtric class to put in yours.
                        But if the grid is drawn ( you see it) and then when you click error comes ?

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                        • A Offline
                          A Offline
                          AliM93
                          wrote on last edited by
                          #137
                          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 mrjj
                            #138

                            @AliM93
                            If it compiles then all includes are fine.

                            Do you load data ?

                            Did you change LoadData function to set colors ?
                            (or use mine, just change the path to the data file)

                            I think all is just black :)
                            (default zero)

                            A 1 Reply Last reply
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                            • mrjjM mrjj

                              @AliM93
                              If it compiles then all includes are fine.

                              Do you load data ?

                              Did you change LoadData function to set colors ?
                              (or use mine, just change the path to the data file)

                              I think all is just black :)
                              (default zero)

                              A Offline
                              A Offline
                              AliM93
                              wrote on last edited by
                              #139

                              @mrjj Done!! now i wii implement the function to save points! i'll let you know. thanks so much

                              mrjjM 1 Reply Last reply
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                              • A AliM93

                                @mrjj Done!! now i wii implement the function to save points! i'll let you know. thanks so much

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by mrjj
                                #140

                                Hi
                                Ok super.
                                Good work. Your first custom Widget :)

                                Saving the points should be ok easy.
                                you can loop the Data array and take all where isSelected is true.

                                Ps please flag this as solved:)

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