QT利用QPdfWriter實(shí)現(xiàn)繪制PDF(支持表單輸出)

更新時(shí)間：2023年01月13日 16:33:07 作者：諾謙

這篇文章主要為大家詳細(xì)介紹了QT如何利用QPdfWriter實(shí)現(xiàn)繪制PDF，并可以支持表單輸出。文中的示例代碼講解詳細(xì)，感興趣的小伙伴可以了解一下

之前打印PDF都是通過(guò)html形式來(lái)實(shí)現(xiàn)的,但是這次要做的東西,需要打印界面控件,所以需要使用QPdfWriter.

通過(guò)QPdfWriter來(lái)獲取QPainter對(duì)象,就能實(shí)現(xiàn)在PDF上來(lái)畫(huà)畫(huà)啦.

代碼生成的PDF如下所示:

代碼效果如下所示:

代碼如下所示：

//通過(guò)dialog來(lái)保存PDF路徑
QString mainWindow::pdfSaveAs(QString fileName)
{
        QString file="";
 
        file = QFileDialog::getSaveFileName (
        this,                               //父組件
        "另存為",                              //標(biāo)題
        QString("%1/%2").arg(QStandardPaths::writableLocation(QStandardPaths::DesktopLocation)).arg(""+fileName+".pdf"),
                                                            //設(shè)置路徑, .表示當(dāng)前路徑,./表示更目錄
        "PDF文件",     //過(guò)濾器,保存的類(lèi)型
        Q_NULLPTR,
        QFileDialog::ShowDirsOnly);
 
        return file;
}
 
//y:表單的Y坐標(biāo)
//horzBorder:水平外邊距,寫(xiě)0表示沒(méi)有邊距
//row,column:行數(shù)和列數(shù)
//unitHeight:單元高度
//font:字體大小
//list:要寫(xiě)入的單元數(shù)據(jù)
void mainWindow::pdfDrawForm(QPainter* paint,int y,int horzBorder,int row,int column,int unitHeight,QFont &font,QStringList& list)
{
    paint->setFont(font);
 
    paint->setPen(QPen(QBrush(QColor(0,0,0)),2));
 
    int Width = paint->viewport().width()-horzBorder*2;
 
    int unitWidth = Width/column;
 
    for(int i=0;i<row;i++)
    {
        int x= horzBorder;
 
        for(int j=0;j<column;j++)
        {
            paint->drawText(QRect(x,y, unitWidth, unitHeight), Qt::AlignCenter,list[i*column+j]);
 
            paint->drawRect(QRect(x,y, unitWidth, unitHeight));
 
            x+=unitWidth;
        }
 
        y += unitHeight;
    }
 
 
 
}
 
 
void mainWindow::pdfCreate(checkInfo &info)
{
 
//        //設(shè)置pdf保存的路徑
//        QString file_path = pdfSaveAs(QString("表單%1").arg(QDateTime::currentDateTime().toString("MMdd-hh-mm")));
//        if(file_path.isEmpty())
//            return;
 
        QString file_path =QApplication::applicationDirPath()+"/test.pdf";  
        QFile pdfFile(file_path);
        pdfFile.open(QIODevice::WriteOnly);
        QPdfWriter* pWriter = new QPdfWriter(&pdfFile);
 
        //Init Page
        pWriter->setPageSize(QPagedPaintDevice::A4);
        pWriter->setResolution(300);    //設(shè)置dpi 每個(gè)平方英寸像素為300
        pWriter->setPageMargins(QMarginsF(30, 30, 30, 30));
 
 
        QPainter* pPainter = new QPainter(pWriter);
 
        //Init Font
        QFont font[5]={QFont("宋體",26,60),QFont("宋體",26,61),QFont("宋體",26,QFont::Normal),QFont("宋體",26,QFont::Normal),QFont("宋體",26,QFont::Normal)};
        font[0].setPixelSize(86);
        font[1].setPixelSize(61);
        font[2].setPixelSize(61);
        font[3].setPixelSize(42);
        font[4].setPixelSize(54);
 
        //Painter PDF
        qDebug()<<pPainter->viewport();
        int nPDFWidth = pPainter->viewport().width();
        int nPDFHeight = pPainter->viewport().height();
 
 
        //在10%的頭部居中顯示
        int y=10;
        pPainter->setFont(font[0]);
        pPainter->drawText(QRect(0,y, nPDFWidth, 100), Qt::AlignCenter,
        m_arg.printTitle);
        y+=140;
        pPainter->setPen(QPen(QBrush(QColor(0,0,0)),5));
        pPainter->drawLine(0,y,nPDFWidth,y);
        pPainter->drawLine(0,y+18,nPDFWidth,y+18);
 
        y+=60;
 
        pPainter->setFont(font[2]);
        pPainter->drawText(QRect(100,y, nPDFWidth/2, 70), Qt::AlignVCenter | Qt::AlignLeft,
        QString("器件型號(hào): %1").arg(info.dev.name));
 
        pPainter->setFont(font[2]);
        pPainter->drawText(QRect(nPDFWidth/2+100,y, nPDFWidth/2-100, 70), Qt::AlignVCenter | Qt::AlignLeft,
        QString("器件編號(hào): %1").arg(info.devNum));
 
        y+=90;
 
        pPainter->setFont(font[2]);
        pPainter->drawText(QRect(100,y, nPDFWidth/2, 70), Qt::AlignVCenter | Qt::AlignLeft,
        QString("裝車(chē)車(chē)號(hào): %1").arg(info.devCar));
 
        pPainter->setFont(font[2]);
        pPainter->drawText(QRect(nPDFWidth/2+100,y, nPDFWidth/2-100, 70), Qt::AlignVCenter | Qt::AlignLeft,
        QString("試驗(yàn)日期: %1").arg(info.checkDate));
 
        y+=110;
 
 
        pPainter->setFont(font[1]);
        pPainter->drawText(QRect(0,y, nPDFWidth, 80), Qt::AlignVCenter | Qt::AlignLeft,
        "減 振 器 標(biāo) 準(zhǔn) 參 數(shù)");
 
        y+=120;
 
 
        QStringList list;
        list<<"速度"<<"壓力"<<"拉力"<<"阻尼系數(shù)"<<"不對(duì)稱(chēng)率"<<"正允差"<<"負(fù)允差";
        list<<info.dev.speed+"m/s"<<info.dev.yaLi+"kN"<<info.dev.laLi+"kN"<<\
              info.dev.zhuNi+"kNs/m"<<info.dev.buDuiC+"%"<<info.dev.zYunCha+"%"<<info.dev.fYunCha+"%";
        pdfDrawForm(pPainter,y,0,2,7,100,font[3],list);
 
        y+=260;
 
 
        pPainter->setFont(font[1]);
        pPainter->drawText(QRect(0,y, nPDFWidth, 80), Qt::AlignVCenter | Qt::AlignLeft,
        "示 功 圖");
        y+=100;
 
        //獲取界面圖片
        int imageBorder=150;        //設(shè)置圖片水平邊距為150
 
        QPixmap pixmap = QPixmap::grabWidget(m_checkChart, m_checkChart->rect());
 
        float x = (float)(nPDFWidth-imageBorder*2)/(float)pixmap.width();
 
        pixmap= pixmap.scaled(nPDFWidth-imageBorder*2, x*pixmap.height(),Qt::IgnoreAspectRatio);    //根據(jù)大小比例,來(lái)放大縮小圖片
 
        pPainter->drawPixmap(imageBorder, y, pixmap);
 
        y+=pixmap.height()+90;
 
        pPainter->setFont(font[1]);
        pPainter->drawText(QRect(0,y, nPDFWidth, 80), Qt::AlignVCenter | Qt::AlignLeft,
        "減 振 器 測(cè) 試 結(jié) 果");
 
        y+=120;
 
        list.clear();
        list<<"拉伸行程:"<<QString::asprintf("%.2fmm",info.laSheng)<<"壓縮行程:"<<QString::asprintf("%.2fmm",info.yaSuo)<<"最大速度:"<<QString::asprintf("%.3fm/s",info.speed)<<"阻尼系數(shù):"<<QString::asprintf("%.2fkNs/m",info.speed)
             <<"最大壓力:"<<QString::asprintf("%.2fkN",info.max)<<"壓力偏差:"<<QString::asprintf("%.2f%",info.maxBaiFengb)<<"最大拉力:"<<QString::asprintf("%.2fkN",info.min)<<"拉力偏差:"<<QString::asprintf("%.2f%",info.minBaiFengb)
              <<"不對(duì)稱(chēng)率:"<<QString::asprintf("%.2f%",info.buduic)<<"運(yùn)行時(shí)間:"<<QString::asprintf("%dS",info.runDate)<<"試驗(yàn)結(jié)果:"<<info.result<<"曲線(xiàn)結(jié)論:"<<info.ChartResult;
        pdfDrawForm(pPainter,y,0,3,8,100,font[3],list);
 
        y+=400;
 
        pPainter->setFont(font[4]);
        pPainter->drawText(QRect(50,y, nPDFWidth/3, 80), Qt::AlignVCenter | Qt::AlignLeft,
        QString( "試驗(yàn)員: %1").arg(m_userLoginInfo->name));
 
        pPainter->drawText(QRect(nPDFWidth/3+50,y, nPDFWidth/3, 80), Qt::AlignVCenter | Qt::AlignLeft,
        QString( "檢查員簽字: "));
 
        pPainter->drawText(QRect(nPDFWidth/3*2,y, nPDFWidth/3, 80), Qt::AlignVCenter | Qt::AlignLeft,
        QString( "簽字日期: "));
 
       // pWriter->newPage(); //寫(xiě)下一頁(yè)
 
        //繪制完畢
        delete pPainter;
        delete pWriter;
        pdfFile.close();
 
 
        //通過(guò)其它PDF閱讀器來(lái)打開(kāi)PDF
        QDesktopServices::openUrl(QUrl::fromLocalFile(file_path));
}

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