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));
}