loadbigfile.cpp

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#include "loadbigfile.h"
#include <QThread>
#include <QString>
#include <QVector>
#include <QPointF>
#include <QFile>
#include <QTextStream>
#include <QRegularExpression>
#include <QDebug>

/*
 * Class used to load a big .txt file in a new thread
 */
LoadBigFile::LoadBigFile(QString fileName, QObject *parent):
QThread( parent )
{
    fname = fileName;
    decimateFlag = true;
}

void LoadBigFile::run()
{
    QFile myFile(fname);
    if (myFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
        QTextStream ecgInfo(&myFile);
        QVector<QVector<QPointF> > ecgVals;
        int iterations;
        if (!ecgInfo.atEnd()) {
            QString strVals = ecgInfo.readLine();
            while (!ecgInfo.atEnd()) {
                strVals = ecgInfo.readLine();
                QStringList strPieces = strVals.split(QRegularExpression("\\s+"));

                if (strPieces.length()==5) {
                    //                double x = 0.0, y = 0.0;
                    //                x = strPieces[0].toDouble();
                    //                y = strPieces[1].toDouble();

                    double elapsed = strPieces[0].toDouble();
                    //    elapsed = elapsed/5;

                    QVector<QPointF> tmp;
                    tmp << QPointF(elapsed, strPieces[1].toDouble())
                                    << QPointF(elapsed, strPieces[2].toDouble())
                                    << QPointF(elapsed, strPieces[3].toDouble())
                                    << QPointF(elapsed, strPieces[4].toDouble());

                    //                ecgVals.append(QPointF(x/1000,y));
                    ecgVals.append(tmp);
                    tmp.clear();
                }
                else if (strPieces.length()==4){
                    QVector<QPointF> tmp;
                    tmp << QPointF(iterations/1000, strPieces[0].toDouble())
                                                    << QPointF(iterations/1000, strPieces[1].toDouble())
                                                    << QPointF(iterations/1000, strPieces[2].toDouble())
                                                    << QPointF(iterations/1000, strPieces[3].toDouble());

                    //                ecgVals.append(QPointF(x/1000,y));
                    iterations++;
                    ecgVals.append(tmp);
                    tmp.clear();
                }

                //    for (int ii=0; ii<=8; ii++) {
                //        ecgInfo.readLine();
                //    }
            }
        }
        ecgInfo.flush();
        myFile.close();

        if (decimateFlag) {
            decimate();
        }

        emit sendFileData(ecgVals);
    }
}

void LoadBigFile::decimate()
{
    //TODO
}