qt 调用GNU barcode生成条形码，环境5.14

#include "qlygnubarcode.h" #include <math.h> //QlyGNUBarcode::QlyGNUBarcode(QObject *parent) : QObject(parent) //{ // QlyGNUBarcode(); //} int Barcode_Delete(struct Barcode_Item *bc) { if (bc->ascii) free(bc->ascii); if (bc->partial) free(bc->partial); if (bc->textinfo) free(bc->textinfo); if (bc->encoding) free(bc->encoding); free(bc); return 0; /* always success */ } /** * @file QlyGNUBarcode.cpp * @author LiYuan * @email 18069211@qq.com * @version v1.0 * @license GPL2.0 * @brief GNU Barcode 库的一个简单封装，用于在 Qt 程序中生成条形码。 * @details 因为用到了 QPainter 和 QImage， 所以需要 QtGui 模块。 * 可用于 Qt4 和 Qt5 代码中。Qt6 还没有测试。 * @copyright 2015-2021 */ #include "QlyGNUBarcode.h" #include <QDebug> #include <string.h> QlyGNUBarcode::QlyGNUBarcode() :bc(nullptr), m_barcode_type(BARCODE_128), m_NO_ASCII(false), m_margin(0), m_fgColor(Qt::black), m_bgColor(Qt::white) { } void QlyGNUBarcode::setMargin(int whitespace) { m_margin = whitespace; } QColor QlyGNUBarcode::foregroundColor() const { return m_fgColor; } void QlyGNUBarcode::setForegroundColor(const QColor & fgColor) { m_fgColor = fgColor; } QColor QlyGNUBarcode::backgroundColor() const { return m_bgColor; } void QlyGNUBarcode::setBackgroundColor(const QColor & bgColor) { m_bgColor = bgColor; } QSize QlyGNUBarcode::minSize() { if( bc ) return QSize(); return QSize(bc->width, bc->height); } bool QlyGNUBarcode::encodeText(const QString &text) { if( bc ) Barcode_Delete(bc); bc = Barcode_Create((char *) text.toLocal8Bit().data()); //Barcode_Position(bc, 0, 0, 0, 0, 1.0); bc->margin = m_margin; int flags = m_barcode_type; if(m_NO_ASCII) { flags = m_barcode_type | BARCODE_NO_ASCII; } else { flags = m_barcode_type; } bc->flags = flags; Barcode_Encode(bc, flags); updateSizeInfo(); return (bc); } bool QlyGNUBarcode::updateSizeInfo() { if( !bc ) return false; if ( !bc->partial || !bc->textinfo ) { bc->error = EINVAL; return false; } /* First, calculate barlen */ int barlen = bc->partial[0] - '0'; for (char * ptr = bc->partial + 1; *ptr; ptr++) { if ( isdigit(*ptr) ) { barlen += (*ptr - '0'); } else if ( islower(*ptr) ) { barlen += (*ptr - 'a' + 1); } } m_minWidth = barlen; // 这个宽度是计算出的最小宽度 m_minHeight = 80; // 默认的高度 qDebug() << "m_minWidth = " << m_minWidth; qDebug() << "m_minHeight = " << m_minHeight; /* The scale factor depends on bar length */ if ( (fabs(bc->scalef) < 1e-6) ) { if ( !bc->width ) { bc->width = barlen; /* default */ } bc->scalef = (double) bc->width / (double)barlen; //qDebug() << "fabs(bc->scalef) < 1e-6 , bc->width = " << bc->width << "bc->scalef = " << bc->scalef; } /* The width defaults to "just enough" */ if ( !bc->width ) { bc->width = barlen * bc->scalef + 1; } /* But it can be too small, in this case enlarge and center the area */ if (bc->width < barlen * bc->scalef) { int wid = barlen * bc->scalef + 1; bc->xoff -= (wid - bc->width) / 2 ; bc->width = wid; /* Can't extend too far on the left */ if (bc->xoff < 0) { bc->width += -bc->xoff; bc->xoff = 0; } } /* The height defaults to 80 points (rescaled) */ if ( !bc->height ) { bc->height = 80 * bc->scalef; } /* If too small (5 + text), reduce the scale factor and center */ int i = 5 + 10 * (( bc->flags & BARCODE_NO_ASCII) == 0 ); if (bc->height < i * bc->scalef ) { double scaleg = ((double) bc->height) / i; int wid = bc->width * scaleg / bc->scalef; bc->xoff += ( bc->width - wid ) / 2; bc->width = wid; bc->scalef = scaleg; } m_margin = bc->margin; m_global_width = bc->xoff + bc->width + 2 * bc->margin; m_global_height = bc->yoff + bc->height + 2 * bc->margin; return true; } bool QlyGNUBarcode::render(QPainter &painter, QRect rect) { int xoffset = bc->xoff; int yoffset = bc->yoff; int width = bc->width; int height = bc->height; double scalef = bc->scalef; bc->xoff = rect.left(); bc->xoff = rect.top(); bc->width = rect.width() - 2 * m_margin; bc->height = rect.height() - 2 * m_margin; bc->scalef = 0.0; updateSizeInfo(); bool ret = render(painter); bc->xoff = xoffset; bc->yoff = yoffset; bc->width = width; bc->height = height; bc->scalef = scalef; return ret; } bool QlyGNUBarcode::drawBar(QPainter &painter) { int mode = '-'; int i; /* text below bars */ char * ptr; double xpos = bc->margin + (bc->partial[0] - '0') * bc->scalef; for (ptr = bc->partial + 1, i = 1; *ptr; ptr++, i++) { /* special cases: '+' and '-' */ if (*ptr == '+' || *ptr == '-') { mode = *ptr; /* don't count it */ i++; continue; } /* j is the width of this bar/space */ int j; if (isdigit (*ptr)) j = *ptr - '0'; else j = *ptr - 'a' + 1; double x0, y0, yr; if (i % 2) /* bar */ { //qDebug() << "bc->xoff = " << bc->xoff << ", xpos = " << xpos; x0 = bc->xoff + xpos;// + (j * scalef) / 2; y0 = bc->yoff + bc->margin; yr = bc->height; if ( !(bc->flags & BARCODE_NO_ASCII) ) { /* leave space for text */ if (mode == '-') { /* text below bars: 10 points or five points */ //y0 += (isdigit(*ptr) ? 10 : 5) * scalef; yr -= (isdigit(*ptr) ? 10 : 5) * bc->scalef; } else { /* '+' */ /* text above bars: 10 or 0 from bottom, and 10 from top */ y0 += (isdigit(*ptr) ? 10 : 0) * bc->scalef; yr -= (isdigit(*ptr) ? 20 : 10) * bc->scalef; } } painter.fillRect(QRect(x0, y0, (j * bc->scalef), yr ), m_fgColor); //qDebug() << "fillRect: " << QRect(x0, y0, (j * m_scalef), yr ); } xpos += j * bc->scalef; } return true; } bool QlyGNUBarcode::drawText(QPainter &painter) { int mode = '-'; /* reinstantiate default */ if (!(bc->flags & BARCODE_NO_ASCII)) { painter.save(); painter.setPen(m_fgColor); for (char * ptr = bc->textinfo; ptr; ptr = strchr(ptr, ' ')) { //qDebug() << "*"; while (*ptr == ' ') ptr++; if (!*ptr) break; if (*ptr == '+' || *ptr == '-') { mode = *ptr; continue; } double f1, f2; char c; if (sscanf(ptr, "%lf:%lf:%c", &f1, &f2, &c) != 3) { //fprintf(stderr, "barcode: impossible data: %s\n", ptr); continue; } painter.setFont(QFont("Helvetica", (int)(0.8 * f2 * bc->scalef))); int x_pos = bc->xoff + f1 * bc->scalef + bc->margin; int y_pos = 0; if(mode == '-') { y_pos = (double)bc->yoff + bc->margin + bc->height ;//- 8 * bc->scalef; } else {