Method paintEvent

Gui/ScaleSliderQWidget.cpp:437–650

}

void
ScaleSliderQWidget::paintEvent(QPaintEvent* /*e*/)
{
    if (_imp->mustInitializeSliderPosition) {
        if (_imp->minimum < _imp->maximum) {
            centerOn(_imp->minimum, _imp->maximum);
        }
        _imp->mustInitializeSliderPosition = false;
        seekScalePosition(_imp->value);
        _imp->initialized = true;
    }

    ///fill the background with the appropriate style color
    QStyleOption opt;
    opt.init(this);
    QPainter p(this);
    p.setOpacity(1);
    style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);

    double txtR, txtG, txtB;
    if (_imp->altered) {
        appPTR->getCurrentSettings()->getAltTextColor(&txtR, &txtG, &txtB);
    } else {
        appPTR->getCurrentSettings()->getTextColor(&txtR, &txtG, &txtB);
    }

    QColor textColor;
    textColor.setRgbF( Image::clamp<qreal>(txtR, 0., 1.),
                       Image::clamp<qreal>(txtG, 0., 1.),
                       Image::clamp<qreal>(txtB, 0., 1.) );

    QColor scaleColor;
    scaleColor.setRgbF(textColor.redF() / 2., textColor.greenF() / 2., textColor.blueF() / 2.);

    QFontMetrics fontM(_imp->font, 0);

    if (!_imp->useLineColor) {
        p.setPen(scaleColor);
    } else {
        p.setPen(_imp->lineColor);
    }

    QPointF btmLeft = _imp->zoomCtx.toZoomCoordinates(0, height() - 1);
    QPointF topRight = _imp->zoomCtx.toZoomCoordinates(width() - 1, 0);

    if ( btmLeft.x() == topRight.x() ) {
        return;
    }

    /*drawing X axis*/
    double lineYpos = height() - 1 - fontM.height()  - TO_DPIY(TICK_HEIGHT) / 2;
    p.drawLine(0, lineYpos, width() - 1, lineYpos);

    double tickBottom = _imp->zoomCtx.toZoomCoordinates( 0, height() - 1 - fontM.height() ).y();
    double tickTop = _imp->zoomCtx.toZoomCoordinates( 0, height() - 1 - fontM.height()  - TO_DPIY(TICK_HEIGHT) ).y();
    const double smallestTickSizePixel = std::min(60., width() / 4.); // tick size (in pixels) for alpha = 0.
    const double largestTickSizePixel = 120.; // tick size (in pixels) for alpha = 1.
    const double rangePixel =  width();