C++ QColor::lightnessF方法代码示例

static QColor darkShade(QColor c)
{
    qreal contrast = 0.7; // taken from kcolorscheme for the dark shade
    qreal darkAmount;

    if (c.lightnessF() < 0.006)
    {
        /* too dark */
        darkAmount = 0.02 + 0.40 * contrast;
    }
    else if (c.lightnessF() > 0.93)
    {
        /* too bright */
        darkAmount = -0.06 - 0.60 * contrast;
    }
    else
    {
        darkAmount = (-c.lightnessF()) * (0.55 + contrast * 0.35);
    }

    qreal v = c.lightnessF() + darkAmount;
    v       = v > 0.0 ? (v < 1.0 ? v : 1.0) : 0.0;
    c.setHsvF(c.hslHueF(), c.hslSaturationF(), v);
    return c;
}

void QgsVectorGradientColorRampV2Dialog::plotMouseMove( QPointF point )
{
  QColor newColor = mStopEditor->selectedStop().color;

  if ( mCurrentPlotColorComponent == 0 )
    newColor = QColor::fromHslF( qBound( 0.0, point.y(), 1.0 ), newColor.hslSaturationF(), newColor.lightnessF(), newColor.alphaF() );
  else if ( mCurrentPlotColorComponent == 1 )
    newColor = QColor::fromHslF( newColor.hslHueF(), newColor.hslSaturationF(), qBound( 0.0, point.y(), 1.0 ), newColor.alphaF() );
  else if ( mCurrentPlotColorComponent == 2 )
    newColor = QColor::fromHslF( newColor.hslHueF(), qBound( 0.0, point.y(), 1.0 ), newColor.lightnessF(), newColor.alphaF() );
  else if ( mCurrentPlotColorComponent == 3 )
    newColor = QColor::fromHslF( newColor.hslHueF(), newColor.hslSaturationF(), newColor.lightnessF(), qBound( 0.0, point.y(), 1.0 ) );

  mStopEditor->setSelectedStopDetails( newColor, qBound( 0.0, point.x(), 1.0 ) );
}

void CurveColorConfigWidget::configCurrentColorChanged(const QColor& color) {
  QPalette palette = ui_->labelColor->palette();
  palette.setColor(QPalette::Window, color);
  palette.setColor(QPalette::WindowText, (color.lightnessF() > 0.5) ?
    Qt::black : Qt::white);
  
  ui_->labelColor->setPalette(palette);
  ui_->labelColor->setText(color.name().toUpper());
}

void QgsGradientColorRampDialog::addMarkersForColor( double x, const QColor &color, bool isSelected )
{
  if ( mPlotHueCheckbox->isChecked() )
    addPlotMarker( x, color.hslHueF(), color, isSelected && mCurrentPlotColorComponent == 0 );
  if ( mPlotLightnessCheckbox->isChecked() )
    addPlotMarker( x, color.lightnessF(), color, isSelected && mCurrentPlotColorComponent == 1 );
  if ( mPlotSaturationCheckbox->isChecked() )
    addPlotMarker( x, color.hslSaturationF(), color, isSelected && mCurrentPlotColorComponent == 2 );
  if ( mPlotAlphaCheckbox->isChecked() )
    addPlotMarker( x, color.alphaF(), color, isSelected && mCurrentPlotColorComponent == 3 );
}

QColor getContrastedColor(const QColor& color)
{
    QColor frontColor = Qt::white;
    qreal s = color.saturationF();
    if(s < 0.4)
    {
        qreal l = color.lightnessF();
        if(l >= 0.5)
            frontColor = Qt::black;
    }
    return frontColor;
}

bool CurveItemWidget::eventFilter(QObject* object, QEvent* event) {
  if (config_) {
    if ((object == ui_->frameColor) && (event->type() == QEvent::Paint)) {
      QPaintEvent* paintEvent = static_cast<QPaintEvent*>(event);
      
      QPainter painter(ui_->frameColor);
      QColor color = config_->getColorConfig()->getCurrentColor();
      
      painter.setBrush(color);
      painter.setPen((color.lightnessF() > 0.5) ? Qt::black : Qt::white);
      
      painter.fillRect(paintEvent->rect(), color);
      painter.drawText(paintEvent->rect(), color.name().toUpper(),
        Qt::AlignHCenter | Qt::AlignVCenter);
    }
  }
  
  return false;
}

// Tints an image with tintColor, while preserving alpha and lightness
void StyleHelper::tintImage(QImage &img, const QColor &tintColor)
{
    QPainter p(&img);
    p.setCompositionMode(QPainter::CompositionMode_Screen);

    for (int x = 0; x < img.width(); ++x) {
        for (int y = 0; y < img.height(); ++y) {
            QRgb rgbColor = img.pixel(x, y);
            int alpha = qAlpha(rgbColor);
            QColor c = QColor(rgbColor);

            if (alpha > 0) {
                c.toHsl();
                qreal l = c.lightnessF();
                QColor newColor = QColor::fromHslF(tintColor.hslHueF(), tintColor.hslSaturationF(), l);
                newColor.setAlpha(alpha);
                img.setPixel(x, y, newColor.rgba());
            }
        }
    }
}

void DiagramViewWrapper::headerDataChanged(Qt::Orientation orientation, int first, int last)
{
    if (orientation == Qt::Horizontal)
    {
        for (int section = first; section <= last; ++section)
        {
			QCheckBox* cbox = m_lstCb[section];
			cbox->setText(model()->headerData(section, orientation).toString());

			// color highlight
			QPalette p = cbox->palette();
			QColor clrBkgd = qvariant_cast<QColor>(model()->headerData(section, Qt::Horizontal, Qt::DecorationRole));
			p.setColor(cbox->backgroundRole(), clrBkgd);
			if (clrBkgd.lightnessF() < 0.5)
			{
				p.setColor(cbox->foregroundRole(), Qt::white);
			}
			cbox->setPalette(p);
			cbox->setAutoFillBackground(true);
        }
    }
}

void tst_QColor::setHsl()
{
    QColor color;

    for (int A = 0; A <= USHRT_MAX; ++A) {
        {
            // 0-255
            int a = A >> 8;
            color.setHsl(0, 0, 0, a);
            QCOMPARE(color.alpha(), a);

            int h, s, l, a2;
            color.getHsv(&h, &s, &l, &a2);
            QCOMPARE(a2, a);
        }

        {
            // 0.0-1.0
            qreal a = A / qreal(USHRT_MAX);
            color.setHslF(0.0, 0.0, 0.0, a);
            QCOMPARE(color.alphaF(), a);

            qreal h, s, l, a2;
            color.getHslF(&h, &s, &l, &a2);
            QCOMPARE(a2, a);
        }
    }

    for (int H = 0; H < 36000; ++H) {
        {
            // 0-255
            int h = H / 100;

            color.setHsl(h, 0, 0, 0);
            QCOMPARE(color.hslHue(), h);

            int h2, s, l, a;
            color.getHsl(&h2, &s, &l, &a);
            QCOMPARE(h2, h);
        }

        {
            // 0.0-1.0
            qreal h = H / 36000.0;
            color.setHslF(h, 0.0, 0.0, 0.0);
            QCOMPARE(color.hslHueF(), h);

            qreal h2, s, l, a;
            color.getHslF(&h2, &s, &l, &a);
            QCOMPARE(h2, h);
        }
    }

    for (int S = 0; S <= USHRT_MAX; ++S) {
        {
            // 0-255
            int s = S >> 8;
            color.setHsl(0, s, 0, 0);
            QCOMPARE(color.hslSaturation(), s);

            int h, s2, l, a;
            color.getHsl(&h, &s2, &l, &a);
            QCOMPARE(s2, s);
        }

        {
            // 0.0-1.0
            qreal s = S / qreal(USHRT_MAX);
            color.setHslF(0.0, s, 0.0, 0.0);
            QCOMPARE(color.hslSaturationF(), s);

            qreal h, s2, l, a;
            color.getHslF(&h, &s2, &l, &a);
            QCOMPARE(s2, s);
        }
    }

    for (int L = 0; L <= USHRT_MAX; ++L) {
        {
            // 0-255
            int l = L >> 8;
            color.setHsl(0, 0, l, 0);
            QCOMPARE(color.lightness(),  l);

            int h, s, l2, a;
            color.getHsl(&h, &s, &l2, &a);
            QCOMPARE(l2, l);
        }

        {
            // 0.0-1.0
            qreal l = L / qreal(USHRT_MAX);
            color.setHslF(0.0, 0.0, l, 0.0);
            QCOMPARE(color.lightnessF(), l);

            qreal h, s, l2, a;
            color.getHslF(&h, &s, &l2, &a);
            QCOMPARE(l2, l);
        }
    }
//.........这里部分代码省略.........

void QgsGradientColorRampDialog::plotMousePress( QPointF point )
{
  //find closest part

  double minDist = 1;
  mCurrentPlotColorComponent = -1;
  mCurrentPlotMarkerIndex = -1;
  // first color

  for ( int i = 0; i < mRamp.count(); ++i )
  {
    QColor currentCol;
    double currentOff = 0.0;
    if ( i == 0 )
    {
      currentOff = 0.0;
      currentCol = mRamp.color1();
    }
    else if ( i == mRamp.count() - 1 )
    {
      currentOff = 1.0;
      currentCol = mRamp.color2();
    }
    else
    {
      currentOff = mRamp.stops().at( i - 1 ).offset;
      currentCol = mRamp.stops().at( i - 1 ).color;
    }

    double currentDist;
    if ( mPlotHueCheckbox->isChecked() )
    {
      currentDist = std::pow( point.x() - currentOff, 2.0 ) + std::pow( point.y() - currentCol.hslHueF(), 2.0 );
      if ( currentDist < minDist )
      {
        minDist = currentDist;
        mCurrentPlotColorComponent = 0;
        mCurrentPlotMarkerIndex = i;
      }
    }
    if ( mPlotLightnessCheckbox->isChecked() )
    {
      currentDist = std::pow( point.x() - currentOff, 2.0 ) + std::pow( point.y() - currentCol.lightnessF(), 2.0 );
      if ( currentDist < minDist )
      {
        minDist = currentDist;
        mCurrentPlotColorComponent = 1;
        mCurrentPlotMarkerIndex = i;
      }
    }
    if ( mPlotSaturationCheckbox->isChecked() )
    {
      currentDist = std::pow( point.x() - currentOff, 2.0 ) + std::pow( point.y() - currentCol.hslSaturationF(), 2.0 );
      if ( currentDist < minDist )
      {
        minDist = currentDist;
        mCurrentPlotColorComponent = 2;
        mCurrentPlotMarkerIndex = i;
      }
    }
    if ( mPlotAlphaCheckbox->isChecked() )
    {
      currentDist = std::pow( point.x() - currentOff, 2.0 ) + std::pow( point.y() - currentCol.alphaF(), 2.0 );
      if ( currentDist < minDist )
      {
        minDist = currentDist;;
        mCurrentPlotColorComponent = 3;
        mCurrentPlotMarkerIndex = i;
      }
    }
  }

  // watch out - selected stop index may differ if stops in editor are out of order!!!
  if ( mCurrentPlotMarkerIndex >= 0 )
    mStopEditor->selectStop( mCurrentPlotMarkerIndex );
}

QString ColorRangeBase::toString(const QColor &clr, ColorRangeBase::ColorModel clrModel)
{
    QString color;
    switch(clrModel){
    case ColorRangeBase::cmRGBA:
        color += QString("RGBA(%1 %2 %3 %4)").arg(clr.redF(),0,'f',2).arg(clr.greenF(),0,'f',2).arg(clr.blueF(),0,'f',2).arg(clr.alphaF(),0,'f',2);
        break;
    case ColorRangeBase::cmHSLA:
        color += QString("HSLA(%1 %2 %3 %4)").arg(clr.hueF(),0,'f',2).arg(clr.saturationF(),0,'f',2).arg(clr.lightnessF(),0,'f',2).arg(clr.alphaF(),0,'f',2);
        break;
    case ColorRangeBase::cmCYMKA:
        color += QString("CMYKA(%1 %2 %3 %4 %5)").arg(clr.cyanF(),0,'f',2).arg(clr.magentaF(),0,'f',2).arg(clr.yellowF(),0,'f',2).arg(clr.blackF(),0,'f',2).arg(clr.alphaF(),0,'f',2);
        break;
    case ColorRangeBase::cmGREYSCALE:
        color += QString("GREY(%1)").arg(clr.redF(),0,'f',2);
        break;
    default:
        break;
    }
    return color;
}

QString colorToString(const QColor &color, ColorFormat format)
{
    QString ret;

    QString prefix;
    QString colorComponents;

    if (format == ColorFormat::QCssRgbUCharFormat) {
        prefix = QLatin1String("rgb(");
        colorComponents = QString::number(color.red()) + QLatin1String(", ")
                + QString::number(color.green()) + QLatin1String(", ")
                + QString::number(color.blue());

        qreal alpha = color.alphaF();
        if (alpha < 1.0) {
            prefix.insert(3, QLatin1Char('a'));
            colorComponents += QLatin1String(", ") + colorDoubleToQString(color.alphaF());
        }
    }
    if (format == ColorFormat::QCssRgbPercentFormat) {
        int rP = qRound(color.redF() * 100);
        int gP = qRound(color.greenF() * 100);
        int bP = qRound(color.blueF() * 100);

        prefix = QLatin1String("rgb(");
        colorComponents = QString::number(rP) + QChar::fromLatin1('%') + QLatin1String(", ")
                + QString::number(gP) + QChar::fromLatin1('%') + QLatin1String(", ")
                + QString::number(bP) + QChar::fromLatin1('%');

        qreal alpha = color.alphaF();

        if (alpha < 1.0) {
            prefix.insert(3, QLatin1Char('a'));
            colorComponents += QLatin1String(", ") + colorDoubleToQString(alpha);
        }
    }
    else if (format == ColorFormat::QssHsvFormat) {
        prefix = QLatin1String("hsv(");
        colorComponents = QString::number(color.hsvHue()) + QLatin1String(", ")
                + QString::number(color.hsvSaturation()) + QLatin1String(", ")
                + QString::number(color.value());

        int aP = qRound(color.alphaF() * 100);

        if (aP < 100) {
            prefix.insert(3, QLatin1Char('a'));
            colorComponents += QLatin1String(", ") + colorDoubleToQString(aP);
        }
    }
    else if (format == ColorFormat::CssHslFormat) {
        prefix = QLatin1String("hsl(");

        int sP = qRound(color.hslSaturationF() * 100);
        int lP = qRound(color.lightnessF() * 100);

        colorComponents = QString::number(color.hslHue()) + QLatin1String(", ")
                + QString::number(sP) + QChar::fromLatin1('%') + QLatin1String(", ")
                + QString::number(lP) + QChar::fromLatin1('%');

        qreal alpha = color.alphaF();
        if (alpha < 1.0) {
            prefix.insert(3, QLatin1Char('a'));
            colorComponents += QLatin1String(", ") + colorDoubleToQString(color.alphaF());
        }
    }
    else if (format == ColorFormat::QmlRgbaFormat) {
        prefix = QLatin1String("Qt.rgba(");
        colorComponents = colorDoubleToQString(color.redF()) + QLatin1String(", ")
                + colorDoubleToQString(color.greenF()) + QLatin1String(", ")
                + colorDoubleToQString(color.blueF()) + QLatin1String(", ")
                + colorDoubleToQString(color.alphaF());
    }
    else if (format == ColorFormat::QmlHslaFormat) {
        prefix = QLatin1String("Qt.hsla(");
        colorComponents = colorDoubleToQString(color.hueF()) + QLatin1String(", ")
                + colorDoubleToQString(color.saturationF()) + QLatin1String(", ")
                + colorDoubleToQString(color.lightnessF()) + QLatin1String(", ")
                + colorDoubleToQString(color.alphaF());
    }
    else if (format == ColorFormat::GlslFormat) {
        prefix = QLatin1String("vec");

        colorComponents = colorDoubleToQString(color.redF()) + QLatin1String(", ")
                + colorDoubleToQString(color.greenF()) + QLatin1String(", ")
                + colorDoubleToQString(color.blueF());

        qreal alpha = color.alphaF();
        if (alpha < 1.0) {
            prefix.append(QLatin1Char('4'));
            colorComponents += QLatin1String(", ") + colorDoubleToQString(color.alphaF());
        } else {
            prefix.append(QLatin1Char('3'));
        }

        prefix.append(QLatin1Char('('));
    }
    else if (format == ColorFormat::HexFormat) {
        prefix = QLatin1String("#");

        int alpha = color.alpha();
//.........这里部分代码省略.........

void KisColorSelectorSimple::setColor(const QColor &c)
{
    switch (m_parameter) {
    case KisColorSelector::SL:
        m_lastClickPos.setX(c.hslSaturationF());
        m_lastClickPos.setY(1.-c.lightnessF());
        emit paramChanged(-1, -1, -1, c.hslSaturationF(), c.lightnessF());
        break;
    case KisColorSelector::LH:
        m_lastClickPos.setX(qBound<qreal>(0., c.hueF(), 1.));
        m_lastClickPos.setY(1.-c.lightnessF());
        emit paramChanged(c.hueF(), -1, -1, -1, c.lightnessF());
        break;
    case KisColorSelector::SV:
        m_lastClickPos.setX(c.saturationF());
        m_lastClickPos.setY(1-c.valueF());
        emit paramChanged(-1, c.saturationF(), c.valueF(), -1, -1);
        break;
    case KisColorSelector::SV2: {
        qreal xRel = c.hsvSaturationF();
        qreal yRel = 0.5;
        
        if(xRel != 1.0)
            yRel = 1.0 - qBound<qreal>(0.0, (c.valueF() - xRel) / (1.0 - xRel), 1.0);
        
        m_lastClickPos.setX(xRel);
        m_lastClickPos.setY(yRel);
        emit paramChanged(-1, -1, -1, xRel, yRel);
        break;
    }
    case KisColorSelector::VH:
        m_lastClickPos.setX(qBound<qreal>(0., c.hueF(), 1.));
        m_lastClickPos.setY(c.valueF());
        emit paramChanged(c.hueF(), -1, c.valueF(), -1, -1);
        break;
    case KisColorSelector::hsvSH:
        m_lastClickPos.setX(qBound<qreal>(0., c.hueF(), 1.));
        m_lastClickPos.setY(1-c.saturationF());
        emit paramChanged(c.hueF(), c.saturationF(), -1, -1, -1);
        break;
    case KisColorSelector::hslSH:
        m_lastClickPos.setX(qBound<qreal>(0., c.hueF(), 1.));
        m_lastClickPos.setY(1-c.hslSaturationF());
        emit paramChanged(c.hueF(), -1, -1, c.hslSaturationF(), -1);
        break;
    case KisColorSelector::L:
        m_lastClickPos.setX(c.lightnessF());
        emit paramChanged(-1, -1, -1, -1, c.lightnessF());
        break;
    case KisColorSelector::V:
        m_lastClickPos.setX(c.valueF());
        emit paramChanged(-1, -1, c.valueF(), -1, -1);
        break;
    case KisColorSelector::hsvS:
        m_lastClickPos.setX(c.saturationF());
        emit paramChanged(-1, c.saturationF(), -1, -1, -1);
        break;
    case KisColorSelector::hslS:
        m_lastClickPos.setX(c.hslSaturationF());
        emit paramChanged(-1, -1, -1, c.hslSaturationF(), -1);
        break;
    case KisColorSelector::H:
        m_lastClickPos.setX(qBound<qreal>(0., c.hueF(), 1.));
        emit paramChanged(c.hueF(), -1, -1, -1, -1);
        break;
    default:
        Q_ASSERT(false);
        break;
    }
    emit update();
}