main.cpp

C++ GUI Programming with Qt 4一书中的chap05源码

#include <QtGui>

#include "plotter.h"

void readFlightCurves(Plotter *plotter, const QString &fileName)
{
    QVector<QPointF> data[6];
    double factX = 0.0013;
    double factY[6] = { 0.0008, 0.1, 0.2, 0.2, 0.1, 0.8 };
    double offsY[6] = { +500, -55, +309, +308, 0, 0 };
    int pos[6] = { 3, 6, 7, 8, 9, 10 };
    QFile file(fileName);
    double offsX = 0.0;

    if (file.open(QIODevice::ReadOnly)) {
        QTextStream in(&file);
        while (!in.atEnd()) {
            QString line = in.readLine();
            QStringList coords = line.split(' ',
                                            QString::SkipEmptyParts);
            if (coords.count() >= 6) {
                double x = factX * coords[0].toDouble();
                if (data[0].isEmpty())
                    offsX = x;
                for (int i = 0; i < 6; ++i) {
                    double y = coords[pos[i]].toDouble();
                    data[i].append(QPointF(x - offsX,
                                           factY[i] * (y - offsY[i])));
                }
            }
        }
    }

    plotter->setCurveData(0, data[0]);
    plotter->setCurveData(1, data[1]);
    plotter->setCurveData(2, data[2]);
    plotter->setCurveData(3, data[3]);
    plotter->setCurveData(4, data[4]);
    plotter->setCurveData(5, data[5]);
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Plotter plotter;
    plotter.setWindowTitle(QObject::tr("Plotter"));
    readFlightCurves(&plotter, "in1.txt");
    plotter.show();
    return app.exec();
}