53.Qt-QPdfWriter绘制PDF,支持表单输出

之前打印PDF都是通过html形式来实现的,但是这次要做的东西,需要打印界面控件,所以需要使用QPdfWriter.

通过QPdfWriter来获取QPainter对象,就能实现在PDF上来画画啦.

代码生成的PDF如下所示:

代码效果如下所示:

代码如下所示：

//通过dialog来保存PDF路径
QString mainWindow::pdfSaveAs(QString fileName)
{
        QString file="";

        file = QFileDialog::getSaveFileName (
        this,                               //父组件
        "另存为",                              //标题
        QString("%1/%2").arg(QStandardPaths::writableLocation(QStandardPaths::DesktopLocation)).arg(""+fileName+".pdf"),
                                                            //设置路径, .表示当前路径,./表示更目录
        "PDF文件",     //过滤器,保存的类型
        Q_NULLPTR,
        QFileDialog::ShowDirsOnly);

        return file;
}

//y:表单的Y坐标
//horzBorder:水平外边距,写0表示没有边距
//row,column:行数和列数
//unitHeight:单元高度
//font:字体大小
//list:要写入的单元数据
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)
{

//        //设置pdf保存的路径
//        QString file_path = pdfSaveAs(QString("表单%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);    //设置dpi 每个平方英寸像素为300
        pWriter->setPageMargins(QMarginsF(30, 30, 30, 30));

        QPainter* pPainter = new QPainter(pWriter);

        //Init Font
        QFont font[5]={QFont("宋体",26,60),QFont("宋体",26,61),QFont("宋体",26,QFont::Normal),QFont("宋体",26,QFont::Normal),QFont("宋体",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%的头部居中显示
        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("器件型号: %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("器件编号: %1").arg(info.devNum));

        y+=90;

        pPainter->setFont(font[2]);
        pPainter->drawText(QRect(100,y, nPDFWidth/2, 70), Qt::AlignVCenter | Qt::AlignLeft,
        QString("装车车号: %1").arg(info.devCar));

        pPainter->setFont(font[2]);
        pPainter->drawText(QRect(nPDFWidth/2+100,y, nPDFWidth/2-100, 70), Qt::AlignVCenter | Qt::AlignLeft,
        QString("试验日期: %1").arg(info.checkDate));

        y+=110;

        pPainter->setFont(font[1]);
        pPainter->drawText(QRect(0,y, nPDFWidth, 80), Qt::AlignVCenter | Qt::AlignLeft,
        "减 振 器 标 准 参 数");

        y+=120;

        QStringList list;
        list<<"速度"<<"压力"<<"拉力"<<"阻尼系数"<<"不对称率"<<"正允差"<<"负允差";
        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 图");
        y+=100;

        //获取界面图片
        int imageBorder=150;        //设置图片水平边距为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);    //根据大小比例,来放大缩小图片

        pPainter->drawPixmap(imageBorder, y, pixmap);

        y+=pixmap.height()+90;

        pPainter->setFont(font[1]);
        pPainter->drawText(QRect(0,y, nPDFWidth, 80), Qt::AlignVCenter | Qt::AlignLeft,
        "减 振 器 测 试 结 果");

        y+=120;

        list.clear();
        list<<"拉伸行程:"<<QString::asprintf("%.2fmm",info.laSheng)<<"压缩行程:"<<QString::asprintf("%.2fmm",info.yaSuo)<<"最大速度:"<<QString::asprintf("%.3fm/s",info.speed)<<"阻尼系数:"<<QString::asprintf("%.2fkNs/m",info.speed)
             <<"最大压力:"<<QString::asprintf("%.2fkN",info.max)<<"压力偏差:"<<QString::asprintf("%.2f%",info.maxBaiFengb)<<"最大拉力:"<<QString::asprintf("%.2fkN",info.min)<<"拉力偏差:"<<QString::asprintf("%.2f%",info.minBaiFengb)
              <<"不对称率:"<<QString::asprintf("%.2f%",info.buduic)<<"运行时间:"<<QString::asprintf("%dS",info.runDate)<<"试验结果:"<<info.result<<"曲线结论:"<<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( "试验员: %1").arg(m_userLoginInfo->name));

        pPainter->drawText(QRect(nPDFWidth/3+50,y, nPDFWidth/3, 80), Qt::AlignVCenter | Qt::AlignLeft,
        QString( "检查员签字: "));

        pPainter->drawText(QRect(nPDFWidth/3*2,y, nPDFWidth/3, 80), Qt::AlignVCenter | Qt::AlignLeft,
        QString( "签字日期: "));

       // pWriter->newPage(); //写下一页

        //绘制完毕
        delete pPainter;
        delete pWriter;
        pdfFile.close();

        //通过其它PDF阅读器来打开PDF
        QDesktopServices::openUrl(QUrl::fromLocalFile(file_path));
}