Method paintEvent

Components/QTimeSlider.cpp:77–217

}

void
QTimeSlider::paintEvent(QPaintEvent *ev)
{
  if (timercmp(&this->startTime, &this->endTime, <=)) {
    QPainter p(this);
    QString tickFormat;
    QColor tickColor = this->palette().color(QPalette::WindowText);
    QFont font;
    qreal lastTextX = 0, textX;
    struct timeval tvFirstTick;
    int tw, th;
    int i;
    struct timeval diff;
    qreal asMsec, x;
    qreal pxPerTick, pxPerLabel;
    qreal tickStepMsec = 1;
    qreal tickSubStepMsec = .1;
    qreal startMsec, alignStartMsec;
    qreal saneTimeSteps[] = {
      1e-2, 1e-1, .25, .5, 1, 10, 25, 50, 1e2, 250, 500,
      1e3, 5e3, 10e3, 30e3, 60e3, 300e3, 900e3, 1800e3, 36000e3};

    qint64 minTicks = 10;
    qint64 maxTicks = this->width() / 2;
    qreal maxTickLen = this->height() / 3;

    QFontMetrics metrics(font);

    th = metrics.height();

    timersub(&this->endTime, &this->startTime, &diff);

    startMsec = static_cast<qreal>(startTime.tv_sec) * 1e3
        + static_cast<qreal>(startTime.tv_usec) * 1e-3;

    asMsec = static_cast<qreal>(diff.tv_sec) * 1e3
        + static_cast<qreal>(diff.tv_usec) * 1e-3;

    /*
     * We are going to assume that this tickStep has room for 10
     * additional subSteps.
     */
    for (
         i = 0;
         i < static_cast<int>(sizeof(saneTimeSteps) / sizeof(qreal));
         ++i) {
      tickStepMsec = saneTimeSteps[i];
      tickSubStepMsec = .1 * tickStepMsec;
      if (asMsec / tickSubStepMsec >= static_cast<qreal>(minTicks)
          && asMsec / tickSubStepMsec < static_cast<qreal>(maxTicks))
        break;
    }

    // Too few ticks
    if (asMsec / tickSubStepMsec < static_cast<qreal>(minTicks)) {
      tickSubStepMsec = asMsec / static_cast<qreal>(minTicks);
      tickStepMsec    = 10 * tickSubStepMsec;
    } else if (asMsec / tickSubStepMsec > static_cast<qreal>(maxTicks)){