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How to generate the barcode 128 in Qpixmap ?

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  • M Offline
    M Offline
    Mihaill
    wrote on last edited by
    #4

    Found a class for encoding. Please help to use it
    .h

    #ifndef _PROMIXIS_CODE128_H
    #define _PROMIXIS_CODE128_H
    
    #include <QString>
    #include <QList>
    #include <QStringList>
    
    class Code128
    {
        typedef char * Symbol;
        enum Symbols { SYM_CodeC=99, SYM_CodeB = 100, SYM_StartA=103, SYM_StartB, SYM_StartC, SYM_Stop, SYM_NA };
        static Code128::Symbol symbols[108];
    
        enum Mode { MODE_A, MODE_B, MODE_C, IDLE };
        static Symbol symbolCode(quint8 c );
        static void addSymbolCodeChar( char c, QStringList & symbols, int & checksum );
        static void addSymbolCodeInt(quint8 value, QStringList & symbols, int & checksum );
        static quint8 digitCount( const QString & data, int startPos );
    
    public:
    
        typedef QList<quint8> BarCode;
    
        /* Code128 encoding of data
         *
         * Accepts characters in the basic ASCII set (ASCII values 32-126).
         * Maximum length is 100 characters, though I doubt any bar code
         * scanner will read that.
         *
         * Returns a list of bar widths. For example 2 3 1 4. This would mean
         * to draw a set of bars with widths 2, 3, 1 and 4. The odd numbered bars
         * are dark and the even numbered bars a light. 4 is the maximum width
         * returned.
         */
        static BarCode encode( const QString & data );
    
    };
    
    #endif // _PROMIXIS_CODE128_H
    

    .cpp

    /*
    
        Code128
    
        Code 128 is a very high-density barcode symbology. It is used
        for alphanumeric or numeric-only barcodes. This implementation
        can encode all 128 characters of ASCII. The implementation can
        switch between mode B and mode C to compress numbers.
    
        https://en.wikipedia.org/wiki/Code_128
    
    
        The MIT License (MIT)
    
        Copyright (c) 2013 Promixis, LLC
    
        Permission is hereby granted, free of charge, to any person obtaining a copy
        of this software and associated documentation files (the "Software"), to deal
        in the Software without restriction, including without limitation the rights
        to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        copies of the Software, and to permit persons to whom the Software is
        furnished to do so, subject to the following conditions:
    
        The above copyright notice and this permission notice shall be included in
        all copies or substantial portions of the Software.
    
        THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
        AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        THE SOFTWARE.
    
    */
    
    #include "code128.h"
    
    Code128::Symbol Code128::symbols[108] = {
    
        "212222", "222122", "222221", "121223", "121322", "131222", "122213", "122312", "132212", "221213",
        "221312", "231212", "112232", "122132", "122231", "113222", "123122", "123221", "223211", "221132",
        "221231", "213212", "223112", "312131", "311222", "321122", "321221", "312212", "322112", "322211",
        "212123", "212321", "232121", "111323", "131123", "131321", "112313", "132113", "132311", "211313",
        "231113", "231311", "112133", "112331", "132131", "113123", "113321", "133121", "313121", "211331",
        "231131", "213113", "213311", "213131", "311123", "311321", "331121", "312113", "312311", "332111",
        "314111", "221411", "431111", "111224", "111422", "121124", "121421", "141122", "141221", "112214",
        "112412", "122114", "122411", "142112", "142211", "241211", "221114", "413111", "241112", "134111",
        "111242", "121142", "121241", "114212", "124112", "124211", "411212", "421112", "421211", "212141",
        "214121", "412121", "111143", "111341", "131141", "114113", "114311", "411113", "411311", "113141",
        "114131", "311141", "411131", "211412", "211214", "211232", "2331112", ""
    };
    
    
    Code128::Symbol Code128::symbolCode(quint8 c)
    {
        if ( c > SYM_Stop )
        {
            return symbols[107];
        }
    
        return symbols[c];
    }
    
    
    
    void Code128::addSymbolCodeChar(char c, QStringList &symbols, int &checksum)
    {
        // keep characters in valid range.
        if ( c < 32 )
        {
            c = 32;
        }
        if ( c > 126 )
        {
            c = 32;
        }
        quint8 value = (unsigned int)c - 32;
        Code128::Symbol symbol = symbolCode(value);
        symbols += symbol;
        checksum += value * ( symbols.count() == 1 ? 1 : symbols.count() - 1 );
    }
    
    void Code128::addSymbolCodeInt(quint8 value, QStringList &symbols, int &checksum)
    {
        Code128::Symbol symbol = symbolCode(value);
        symbols += symbol;
        checksum += value * ( symbols.count() == 1 ? 1 : symbols.count() - 1 );
    }
    
    quint8 Code128::digitCount(const QString &data, int startPos)
    {
        quint8 cnt = 0;
    
        for ( ;startPos < data.length();startPos++ )
        {
            if ( !data.at(startPos).isDigit() )
            {
                break;
            }
            cnt++;
        }
    
        cnt &= 0xfe; // only pairs please.
        return cnt;
    }
    
    Code128::BarCode Code128::encode(const QString &data)
    {
        QStringList symbols;
        int checkSum = 0;
    
        if ( data.length() > 100 || data.length() == 0 )
        {
            return BarCode();
        }
    
        int pos = 0;
    
        Mode mode = IDLE;
    
        while ( pos < data.length() )
        {
            quint8 dc = digitCount(data, pos);
    
            if ( dc >= 4 )
            {
    
                if ( mode != MODE_C )
                {
                    if ( mode == IDLE )
                    {
                        addSymbolCodeInt(SYM_StartC, symbols, checkSum);
                    }
                    else
                    {
                        addSymbolCodeInt(SYM_CodeC, symbols, checkSum);
                    }
                    mode = MODE_C;
                }
    
                dc = dc>>1;
                for ( int i=0; i < dc; i++ )
                {
                    QString v = data.mid(pos,2);
                    int value = v.toInt();
                    addSymbolCodeInt(value, symbols, checkSum);
                    pos+=2;
                }
            }
            else
            {
                if ( mode != MODE_B )
                {
                    if ( mode == IDLE )
                    {
                        addSymbolCodeInt(SYM_StartB, symbols, checkSum);
                    }
                    else
                    {
                        addSymbolCodeInt(SYM_CodeB, symbols, checkSum);
                    }
                    mode = MODE_B;
                }
                addSymbolCodeChar( data.at(pos).toLatin1(), symbols, checkSum );
                pos++;
            }
        }
    
        quint8 remainder = checkSum % 103;
        addSymbolCodeInt(remainder, symbols, checkSum);
        addSymbolCodeInt(SYM_Stop, symbols, checkSum);
    
        QString code = symbols.join("");
        BarCode b;
        for(int i=0;i<code.length();i++)
        {
            QString v = code.at(i);
            b << v.toInt();
        }
    
        return b;
    }
    
    
    mrjjM 1 Reply Last reply
    0
    • M Offline
      M Offline
      Mihaill
      wrote on last edited by
      #5

      This library not works https://github.com/ftylitak/qzxing, not work encoder.

      F 1 Reply Last reply
      0
      • M Mihaill

        This library not works https://github.com/ftylitak/qzxing, not work encoder.

        F Offline
        F Offline
        favoritas37
        wrote on last edited by
        #6

        @Mihaill QZXing encoder support only Qr Codes for now so it will not suit you.

        1 Reply Last reply
        0
        • M Offline
          M Offline
          Mihaill
          wrote on last edited by
          #7

          Clearly. But maybe you know how to encode using a font?

          1 Reply Last reply
          0
          • M Mihaill

            Found a class for encoding. Please help to use it
            .h

            #ifndef _PROMIXIS_CODE128_H
            #define _PROMIXIS_CODE128_H
            
            #include <QString>
            #include <QList>
            #include <QStringList>
            
            class Code128
            {
                typedef char * Symbol;
                enum Symbols { SYM_CodeC=99, SYM_CodeB = 100, SYM_StartA=103, SYM_StartB, SYM_StartC, SYM_Stop, SYM_NA };
                static Code128::Symbol symbols[108];
            
                enum Mode { MODE_A, MODE_B, MODE_C, IDLE };
                static Symbol symbolCode(quint8 c );
                static void addSymbolCodeChar( char c, QStringList & symbols, int & checksum );
                static void addSymbolCodeInt(quint8 value, QStringList & symbols, int & checksum );
                static quint8 digitCount( const QString & data, int startPos );
            
            public:
            
                typedef QList<quint8> BarCode;
            
                /* Code128 encoding of data
                 *
                 * Accepts characters in the basic ASCII set (ASCII values 32-126).
                 * Maximum length is 100 characters, though I doubt any bar code
                 * scanner will read that.
                 *
                 * Returns a list of bar widths. For example 2 3 1 4. This would mean
                 * to draw a set of bars with widths 2, 3, 1 and 4. The odd numbered bars
                 * are dark and the even numbered bars a light. 4 is the maximum width
                 * returned.
                 */
                static BarCode encode( const QString & data );
            
            };
            
            #endif // _PROMIXIS_CODE128_H
            

            .cpp

            /*
            
                Code128
            
                Code 128 is a very high-density barcode symbology. It is used
                for alphanumeric or numeric-only barcodes. This implementation
                can encode all 128 characters of ASCII. The implementation can
                switch between mode B and mode C to compress numbers.
            
                https://en.wikipedia.org/wiki/Code_128
            
            
                The MIT License (MIT)
            
                Copyright (c) 2013 Promixis, LLC
            
                Permission is hereby granted, free of charge, to any person obtaining a copy
                of this software and associated documentation files (the "Software"), to deal
                in the Software without restriction, including without limitation the rights
                to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
                copies of the Software, and to permit persons to whom the Software is
                furnished to do so, subject to the following conditions:
            
                The above copyright notice and this permission notice shall be included in
                all copies or substantial portions of the Software.
            
                THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
                IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
                FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
                AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
                LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
                OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
                THE SOFTWARE.
            
            */
            
            #include "code128.h"
            
            Code128::Symbol Code128::symbols[108] = {
            
                "212222", "222122", "222221", "121223", "121322", "131222", "122213", "122312", "132212", "221213",
                "221312", "231212", "112232", "122132", "122231", "113222", "123122", "123221", "223211", "221132",
                "221231", "213212", "223112", "312131", "311222", "321122", "321221", "312212", "322112", "322211",
                "212123", "212321", "232121", "111323", "131123", "131321", "112313", "132113", "132311", "211313",
                "231113", "231311", "112133", "112331", "132131", "113123", "113321", "133121", "313121", "211331",
                "231131", "213113", "213311", "213131", "311123", "311321", "331121", "312113", "312311", "332111",
                "314111", "221411", "431111", "111224", "111422", "121124", "121421", "141122", "141221", "112214",
                "112412", "122114", "122411", "142112", "142211", "241211", "221114", "413111", "241112", "134111",
                "111242", "121142", "121241", "114212", "124112", "124211", "411212", "421112", "421211", "212141",
                "214121", "412121", "111143", "111341", "131141", "114113", "114311", "411113", "411311", "113141",
                "114131", "311141", "411131", "211412", "211214", "211232", "2331112", ""
            };
            
            
            Code128::Symbol Code128::symbolCode(quint8 c)
            {
                if ( c > SYM_Stop )
                {
                    return symbols[107];
                }
            
                return symbols[c];
            }
            
            
            
            void Code128::addSymbolCodeChar(char c, QStringList &symbols, int &checksum)
            {
                // keep characters in valid range.
                if ( c < 32 )
                {
                    c = 32;
                }
                if ( c > 126 )
                {
                    c = 32;
                }
                quint8 value = (unsigned int)c - 32;
                Code128::Symbol symbol = symbolCode(value);
                symbols += symbol;
                checksum += value * ( symbols.count() == 1 ? 1 : symbols.count() - 1 );
            }
            
            void Code128::addSymbolCodeInt(quint8 value, QStringList &symbols, int &checksum)
            {
                Code128::Symbol symbol = symbolCode(value);
                symbols += symbol;
                checksum += value * ( symbols.count() == 1 ? 1 : symbols.count() - 1 );
            }
            
            quint8 Code128::digitCount(const QString &data, int startPos)
            {
                quint8 cnt = 0;
            
                for ( ;startPos < data.length();startPos++ )
                {
                    if ( !data.at(startPos).isDigit() )
                    {
                        break;
                    }
                    cnt++;
                }
            
                cnt &= 0xfe; // only pairs please.
                return cnt;
            }
            
            Code128::BarCode Code128::encode(const QString &data)
            {
                QStringList symbols;
                int checkSum = 0;
            
                if ( data.length() > 100 || data.length() == 0 )
                {
                    return BarCode();
                }
            
                int pos = 0;
            
                Mode mode = IDLE;
            
                while ( pos < data.length() )
                {
                    quint8 dc = digitCount(data, pos);
            
                    if ( dc >= 4 )
                    {
            
                        if ( mode != MODE_C )
                        {
                            if ( mode == IDLE )
                            {
                                addSymbolCodeInt(SYM_StartC, symbols, checkSum);
                            }
                            else
                            {
                                addSymbolCodeInt(SYM_CodeC, symbols, checkSum);
                            }
                            mode = MODE_C;
                        }
            
                        dc = dc>>1;
                        for ( int i=0; i < dc; i++ )
                        {
                            QString v = data.mid(pos,2);
                            int value = v.toInt();
                            addSymbolCodeInt(value, symbols, checkSum);
                            pos+=2;
                        }
                    }
                    else
                    {
                        if ( mode != MODE_B )
                        {
                            if ( mode == IDLE )
                            {
                                addSymbolCodeInt(SYM_StartB, symbols, checkSum);
                            }
                            else
                            {
                                addSymbolCodeInt(SYM_CodeB, symbols, checkSum);
                            }
                            mode = MODE_B;
                        }
                        addSymbolCodeChar( data.at(pos).toLatin1(), symbols, checkSum );
                        pos++;
                    }
                }
            
                quint8 remainder = checkSum % 103;
                addSymbolCodeInt(remainder, symbols, checkSum);
                addSymbolCodeInt(SYM_Stop, symbols, checkSum);
            
                QString code = symbols.join("");
                BarCode b;
                for(int i=0;i<code.length();i++)
                {
                    QString v = code.at(i);
                    b << v.toInt();
                }
            
                return b;
            }
            
            
            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #8

            @Mihaill said in How to generate the barcode 128 in Qpixmap ?:

            _PROMIXIS_CODE128_H

            Hi
            There is an example included
            https://github.com/promixis/Code128/blob/master/src/mainwindow.cpp
            did you try it ?

            M 1 Reply Last reply
            1
            • mrjjM mrjj

              @Mihaill said in How to generate the barcode 128 in Qpixmap ?:

              _PROMIXIS_CODE128_H

              Hi
              There is an example included
              https://github.com/promixis/Code128/blob/master/src/mainwindow.cpp
              did you try it ?

              M Offline
              M Offline
              Mihaill
              wrote on last edited by
              #9

              @mrjj I tried. It draws on QGraphicsScene. I need a picture or text to print. I don't need the output on the screen.

              mrjjM 1 Reply Last reply
              0
              • M Mihaill

                @mrjj I tried. It draws on QGraphicsScene. I need a picture or text to print. I don't need the output on the screen.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #10

                ok but you can render the scene to an image.

                QImage image(fn);
                QPainter painter(&image);
                painter.setRenderHint(QPainter::Antialiasing);
                scene.render(&painter);
                image.save("file_name.png")
                

                and you dont need to show the scene to user etc.

                M 1 Reply Last reply
                1
                • mrjjM mrjj

                  ok but you can render the scene to an image.

                  QImage image(fn);
                  QPainter painter(&image);
                  painter.setRenderHint(QPainter::Antialiasing);
                  scene.render(&painter);
                  image.save("file_name.png")
                  

                  and you dont need to show the scene to user etc.

                  M Offline
                  M Offline
                  Mihaill
                  wrote on last edited by Mihaill
                  #11

                  @mrjj It's dont works:

                      QImage image;
                      QPainter painter(&image);
                      painter.setRenderHint(QPainter::Antialiasing);
                      m_Scene.render(&painter);
                  

                  This works, but the first line is obtained more rest. I don't understand why. And there is a line on top. Please tell me how to remove it.

                      QRectF r =m_Barcode->boundingRect();
                      QPixmap pixmap(r.width(), r.height());
                      pixmap.fill(QColor(0, 0, 0, 0));
                      QPainter painter(&pixmap);
                      //painter.setBrush(QBrush(QColor(0, 0, 0, 0)));
                      painter.drawRect(r);
                      m_Scene.render(&painter);
                      //m_Scene.r
                      //m_Scene.render(&painter, QRectF(), m_Barcode->sceneBoundingRect());
                      painter.end();
                  

                  2.png

                  1 Reply Last reply
                  0
                  • M Offline
                    M Offline
                    Mihaill
                    wrote on last edited by
                    #12

                    It's work, but the barcode is not placed all and therefore not read the picture. How do I know the size of the barcode?

                        m_Barcode = new Code128Item();
                            m_Barcode->setWidth( 200 );
                            m_Barcode->setHeight( 80 );
                            m_Barcode->setPos(0,0);
                            m_Barcode->setText("Promixis");
                            m_Scene.addItem( m_Barcode );
                            m_Scene.update();
                            m_Barcode->update();
                        
                        //    QRectF r =m_Barcode->boundingRect();
                        //    QPixmap pixmap(r.width(), r.height());
                            QPixmap pixmap(m_Barcode->boundingRect().width(), 80);
                            pixmap.fill(QColor(0, 0, 0, 0));
                            QPainter painter(&pixmap);
                            //painter.setBrush(QBrush(QColor(0, 0, 0, 0)));
                            //painter.drawRect(r);
                            m_Scene.render(&painter);
                            //m_Scene.r
                            //m_Scene.render(&painter, QRectF(), m_Barcode->sceneBoundingRect());
                            painter.end();
                    
                    mrjjM 1 Reply Last reply
                    0
                    • M Mihaill

                      It's work, but the barcode is not placed all and therefore not read the picture. How do I know the size of the barcode?

                          m_Barcode = new Code128Item();
                              m_Barcode->setWidth( 200 );
                              m_Barcode->setHeight( 80 );
                              m_Barcode->setPos(0,0);
                              m_Barcode->setText("Promixis");
                              m_Scene.addItem( m_Barcode );
                              m_Scene.update();
                              m_Barcode->update();
                          
                          //    QRectF r =m_Barcode->boundingRect();
                          //    QPixmap pixmap(r.width(), r.height());
                              QPixmap pixmap(m_Barcode->boundingRect().width(), 80);
                              pixmap.fill(QColor(0, 0, 0, 0));
                              QPainter painter(&pixmap);
                              //painter.setBrush(QBrush(QColor(0, 0, 0, 0)));
                              //painter.drawRect(r);
                              m_Scene.render(&painter);
                              //m_Scene.r
                              //m_Scene.render(&painter, QRectF(), m_Barcode->sceneBoundingRect());
                              painter.end();
                      
                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by mrjj
                      #13

                      Hi
                      Im not sure what
                      ' but the barcode is not placed all and therefore not read the picture'
                      means ?

                      The rendered image is cut off ?

                      Anyway, did check out
                      void Code128Item::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
                      in code128item.cpp

                      It seems it would be easy to make a version that would just draw to an image as you want.
                      Its not really tied to QGraphicsScene and would work in a normal paintEvent.

                      M 1 Reply Last reply
                      0
                      • mrjjM mrjj

                        Hi
                        Im not sure what
                        ' but the barcode is not placed all and therefore not read the picture'
                        means ?

                        The rendered image is cut off ?

                        Anyway, did check out
                        void Code128Item::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
                        in code128item.cpp

                        It seems it would be easy to make a version that would just draw to an image as you want.
                        Its not really tied to QGraphicsScene and would work in a normal paintEvent.

                        M Offline
                        M Offline
                        Mihaill
                        wrote on last edited by Mihaill
                        #14

                        @mrjj Yes, the rendered image is clipped.

                        If you do so, the image is also cropped. Need as the otherwise set width QPixamp.

                            QPixmap pixmap(m_Barcode->boundingRect().width(), 80);
                            pixmap.fill(QColor(0, 0, 0, 0));
                            QPainter painter(&pixmap);
                            //painter.setBrush(QBrush(QColor(0, 0, 0, 0)));
                            //painter.drawRect(r);
                        //    m_Scene.render(&painter);
                        //    //m_Scene.render(&painter, QRectF(), m_Barcode->sceneBoundingRect());
                        //    painter.end();
                        
                            QWidget widget;
                            QStyleOptionGraphicsItem styleOptionGraphicsItem ;
                            m_Barcode->paint(&painter, &styleOptionGraphicsItem, &widget); //(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
                        
                        1 Reply Last reply
                        0
                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #15

                          Hi,

                          Take the code inside that method and apply it on a QImage.

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                          1 Reply Last reply
                          1
                          • mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by mrjj
                            #16

                            Hi
                            It turns out its not even using the other parameters (QStyleOptionGraphicsItem , widget) so you can directly just call it to paint on pixmap.

                               QPixmap pix(200, 80); // match the actual values if u change them
                                QPainter paint(&pix);
                                pix.fill( Qt::white );
                                m_Barcode->paint(&paint,nullptr, nullptr);
                                pix.save("e:/test.png");
                            

                            and get a perfect sized image.

                            alt text

                            M 1 Reply Last reply
                            1
                            • mrjjM mrjj

                              Hi
                              It turns out its not even using the other parameters (QStyleOptionGraphicsItem , widget) so you can directly just call it to paint on pixmap.

                                 QPixmap pix(200, 80); // match the actual values if u change them
                                  QPainter paint(&pix);
                                  pix.fill( Qt::white );
                                  m_Barcode->paint(&paint,nullptr, nullptr);
                                  pix.save("e:/test.png");
                              

                              and get a perfect sized image.

                              alt text

                              M Offline
                              M Offline
                              Mihaill
                              wrote on last edited by
                              #17

                              @mrjj Strange, but I have such code clips picture.2.png

                              mrjjM 1 Reply Last reply
                              0
                              • M Offline
                                M Offline
                                Mihaill
                                wrote on last edited by
                                #18

                                The program or draws normally, or increases in 1,25 depending on the text. Why so?

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                                0
                                • M Mihaill

                                  @mrjj Strange, but I have such code clips picture.2.png

                                  mrjjM Offline
                                  mrjjM Offline
                                  mrjj
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #19

                                  @Mihaill
                                  Very strange. it works flawless here.
                                  You have the default sizes ?

                                     m_Barcode = new Code128Item();
                                      m_Barcode->setWidth( 200 );
                                      m_Barcode->setHeight( 80 );
                                      m_Barcode->setPos(0,0);
                                      m_Barcode->setText("Promixis");
                                  
                                      QPixmap pix(200, 80); // MUST match the setWidth, setHeight
                                      QPainter paint(&pix);
                                      pix.fill( Qt::white );
                                      m_Barcode->paint(&paint,nullptr, nullptr);
                                      pix.save("e:/test.png");
                                  
                                  1 Reply Last reply
                                  1
                                  • mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #20

                                    @Mihaill said in How to generate the barcode 128 in Qpixmap ?:

                                    the program or draws normally, or increases in 1,25 depending on the text. Why so?

                                    I dont know what this means ?

                                    The images becomes bigger with bigger text ?
                                    That is normal for barcode 128.
                                    The data limit is normally 48 chars but its not hard limit and it will expand the barcode to the point where its too wide for pratical use.

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                                    • M Offline
                                      M Offline
                                      Mihaill
                                      wrote on last edited by
                                      #21

                                      I understand that the number of sticks is changing. But the pixel size of the image changes by 1.25 times or 1. And the picture is cropped and the barcode is not correct.
                                      2.png

                                      2.png
                                      Here 2 pictures of the same size, but one the size of the shaded zone higher in 1,25. Why so?

                                      mrjjM 1 Reply Last reply
                                      0
                                      • M Mihaill

                                        I understand that the number of sticks is changing. But the pixel size of the image changes by 1.25 times or 1. And the picture is cropped and the barcode is not correct.
                                        2.png

                                        2.png
                                        Here 2 pictures of the same size, but one the size of the shaded zone higher in 1,25. Why so?

                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by mrjj
                                        #22

                                        @Mihaill
                                        Hi
                                        the programmer made it so, it seems.

                                        void Code128Item::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
                                        {
                                            float lineWidth = m_Width / m_CodeLength;
                                        
                                        
                                            /*
                                             * This code tries to fit the barcode right inside the width. If the code
                                             * is too long this means that the bar width goes below one pixel. Which in
                                             * turn means we get no barcode. On printers this is not a problem too fast
                                             * as they have 600 DPI usually. Screens with 96 DPI run out faster.
                                             *
                                             */
                                        
                                        if ( !m_HighDPI )
                                            {
                                                lineWidth = qRound(lineWidth);
                                                if ( lineWidth < 1 )
                                                {
                                                    lineWidth = 1;
                                                }
                                            }
                                        
                                        

                                        so it tries to fit in area and might alter the lineWidth. and hence the barcode has a different size.

                                        try
                                        m_Barcode->setHighDPI(true);

                                        alt text

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                                        • M Offline
                                          M Offline
                                          Mihaill
                                          wrote on last edited by
                                          #23

                                          Thanks, now works fine

                                          1 Reply Last reply
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