File indexing completed on 2024-05-12 04:43:19

 /* This file is part of the KDE project
  * Copyright (C) 2001-2012 by OpenMFG, LLC
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  * Please contact info@openmfg.com with any questions on this license.
  */
 
 /*
  *     This file contains the implementation of the interleaved 2 of 5 barcode renderer.
  * All this code assumes a 100dpi rendering surface for it's calculations.
  */
 
 #include <QString>
 #include <QRectF>
 #include <QPainter>
 #include <QPen>
 #include <QBrush>
 
 const char* __i2of5charmap[] = {
     "NNWWN",
     "WNNNW",
     "NWNNW",
     "WWNNN",
     "NNWNW",
     "WNWNN",
     "NWWNN",
     "NNNWW",
     "WNNWN",
     "NWNWN"
 };
 
 
 static QPointF addElement(const QRectF &r, QPointF startPos, qreal width, bool isSpace, QPainter * pPainter)
 {
     if (!isSpace && pPainter) {
         pPainter->fillRect(startPos.x(),startPos.y(), width, r.height(), pPainter->pen().color());
     }
 
     return QPointF(startPos.x() + width, startPos.y());
 }
 
 static QPointF addBar(const QRectF &r, QPointF startPos, qreal width, QPainter * pPainter)
 {
     return addElement(r, startPos, width, false, pPainter);
 }
 static QPointF addSpace(const QRectF &r, QPointF startPos, qreal width, QPainter * pPainter)
 {
     return addElement(r, startPos, width, true, pPainter);
 }
 
 
 void renderI2of5(const QRectF &r, const QString & _str, Qt::Alignment align, QPainter * pPainter)
 {
     QString str = _str;
     qreal narrow_bar = 1; // a narrow bar is 1/100th inch wide
     qreal bar_width_mult = 2.5; // the wide bar width multiple of the narrow bar
     qreal wide_bar = narrow_bar * bar_width_mult;
 
     if (str.length() % 2) {
         str = QLatin1Char('0')+ str; // padding zero if number of characters is not even
     }
 
     // this is our mandatory minimum quiet zone
     qreal quiet_zone = narrow_bar * 10;
     if(quiet_zone < 0.1) {
         quiet_zone = 0.1;
     }
 
     // what kind of area do we have to work with
     int draw_width = r.width();
 
     // how long is the value we need to encode?
     int val_length = str.length();
 
     // L = (C(2N+3)+6+N)X
     // L length of barcode (excluding quite zone
     // C the number of characters in the value excluding the start/stop
     // N the bar width multiple for wide bars
     // X the width of a bar (pixels in our case)
     int L;
     int C = val_length;
     qreal N = bar_width_mult;
     qreal X = narrow_bar;
 
     L = (C * (2.0*N + 3.0) + 6.0 + N) * X;
 
     // now we have the actual width the barcode will be so can determine the actual
     // size of the quiet zone (we assume we center the barcode in the given area)
     // At the moment the way the code is written is we will always start at the minimum
     // required quiet zone if we don't have enough space.... I guess we'll just have over-run
     // to the right
     //
     // calculate the starting position based on the alignment option
     if (align == Qt::AlignHCenter) {
         int nqz = (draw_width - L) / 2.0;
         if (nqz > quiet_zone) {
             quiet_zone = nqz;
         }
     }
     else if (align == Qt::AlignRight) {
         quiet_zone = draw_width - (L + quiet_zone);
     }
     // left : do nothing
 
     if (pPainter) {
         pPainter->save();
 
         QPen oneWide(pPainter->pen());
         oneWide.setWidth(1);
 #ifndef Q_OS_WIN32
         oneWide.setJoinStyle(Qt::MiterJoin);
 #endif
         pPainter->setPen(oneWide);
         pPainter->setBrush(pPainter->pen().color());
     }
 
     QPointF pos(r.left() + quiet_zone, r.top());
 
     // start character
     pos = addBar(r, pos, narrow_bar,pPainter);
     pos = addSpace(r, pos, narrow_bar, pPainter);
     pos = addBar(r, pos, narrow_bar, pPainter);
     pos = addSpace(r, pos, narrow_bar, pPainter);
 
     for (int i = 0; i < str.length()-1; i+=2) {
         for (int iElt = 0; __i2of5charmap [0][iElt] != '\0'; iElt++) {
             for (int offset=0; offset<=1; offset++) {
                 QChar c = str.at(i+offset);
                 if (!c.isDigit()) {
                     break; // invalid character
                 }
 
                 int iChar = c.digitValue();
                 int width = __i2of5charmap[iChar][iElt] == 'W' ? wide_bar : narrow_bar;
                 pos = addElement(r, pos, width, offset==1, pPainter);
             }
         }
     }
 
     // stop character
     pos = addBar(r, pos, wide_bar, pPainter);
     pos = addSpace(r, pos, narrow_bar, pPainter);
     pos = addBar(r, pos, narrow_bar, pPainter);
 }