C++ qCeil函数代码示例

/*!
   Calculate the minimum length that is needed to draw the scale

   \param font Font used for painting the labels

   \sa extent()
*/
int QwtScaleDraw::minLength( const QFont &font ) const
{
    int startDist, endDist;
    getBorderDistHint( font, startDist, endDist );

    const QwtScaleDiv &sd = scaleDiv();

    const uint minorCount =
        sd.ticks( QwtScaleDiv::MinorTick ).count() +
        sd.ticks( QwtScaleDiv::MediumTick ).count();
    const uint majorCount =
        sd.ticks( QwtScaleDiv::MajorTick ).count();

    int lengthForLabels = 0;
    if ( hasComponent( QwtAbstractScaleDraw::Labels ) )
    {
        if ( majorCount >= 2 )
            lengthForLabels = minLabelDist( font ) * ( majorCount - 1 );
    }

    int lengthForTicks = 0;
    if ( hasComponent( QwtAbstractScaleDraw::Ticks ) )
    {
        const double pw = qMax( 1, penWidth() );  // penwidth can be zero
        lengthForTicks = qCeil( ( majorCount + minorCount ) * ( pw + 1.0 ) );
    }

    return startDist + endDist + qMax( lengthForLabels, lengthForTicks );
}

/*!
  \return Minimum size hint
  \warning The return value depends on the font and the scale.
  \sa sizeHint()
*/
QSize QwtThermo::minimumSizeHint() const
{
    int w = 0, h = 0;

    if ( d_data->scalePosition != NoScale )
    {
        const int sdExtent = qCeil( scaleDraw()->extent( font() ) );
        const int sdLength = scaleDraw()->minLength( font() );

        w = sdLength;
        h = d_data->pipeWidth + sdExtent + d_data->spacing;

    }
    else // no scale
    {
        w = 200;
        h = d_data->pipeWidth;
    }

    if ( d_data->orientation == Qt::Vertical )
        qSwap( w, h );

    w += 2 * d_data->borderWidth;
    h += 2 * d_data->borderWidth;

    // finally add the margins
    int left, right, top, bottom;
    getContentsMargins( &left, &top, &right, &bottom );
    w += left + right;
    h += top + bottom;

    return QSize( w, h );
}

qreal SoftSlider::tickSpan(qreal min, qreal max, qreal space, qreal minsep)
{
    if (space == 0)
        return qInf();

    qreal jmp = minsep * (max - min) / space;

    qreal b = 1;

    while (b * 10 <= jmp)
        b *= 10;

    if (jmp > 0)
        while (b / 10 >= jmp)
            b /= 10;

    int q = qCeil(jmp / b);

    if (q > 5)
        return b * 10;

    if (q > 2)
        return b * 5;

    if (q > 1)
        return b * 2;

    return b;
}

void QSGTextNode::addTextDecorations(Decoration decorations, const QPointF &position,
                                     const QColor &color, qreal width, qreal lineThickness,
                                     qreal underlinePos, qreal ascent)
{
    QRectF line(position.x(), position.y() - lineThickness / 2.0, width, lineThickness);

    if (decorations & Underline) {
        int underlinePosition = qCeil(underlinePos);
        QRectF underline(line);
        underline.translate(0.0, underlinePosition);
        appendChildNode(new QSGSimpleRectNode(underline, color));
    }

    if (decorations & Overline) {
        QRectF overline(line);
        overline.translate(0.0, -ascent);
        appendChildNode(new QSGSimpleRectNode(overline, color));
    }

    if (decorations & StrikeOut) {
        QRectF strikeOut(line);
        strikeOut.translate(0.0, ascent / -3.0);
        appendChildNode(new QSGSimpleRectNode(strikeOut, color));
    }
}

void QDeclarativeRectangle::generateRoundedRect()
{
    Q_D(QDeclarativeRectangle);
    if (d->rectImage.isNull()) {
        const int pw = d->pen && d->pen->isValid() ? d->pen->width() : 0;
        const int radius = qCeil(d->radius);    //ensure odd numbered width/height so we get 1-pixel center

        QString key = QLatin1String("q_") % QString::number(pw) % d->color.name() % QString::number(d->color.alpha(), 16) % QLatin1Char('_') % QString::number(radius);
        if (d->pen && d->pen->isValid())
            key += d->pen->color().name() % QString::number(d->pen->color().alpha(), 16);

        if (!QPixmapCache::find(key, &d->rectImage)) {
            d->rectImage = QPixmap(radius*2 + 3 + pw*2, radius*2 + 3 + pw*2);
            d->rectImage.fill(Qt::transparent);
            QPainter p(&(d->rectImage));
            p.setRenderHint(QPainter::Antialiasing);
            if (d->pen && d->pen->isValid()) {
                QPen pn(QColor(d->pen->color()), d->pen->width());
                p.setPen(pn);
            } else {
                p.setPen(Qt::NoPen);
            }
            p.setBrush(d->color);
            if (pw%2)
                p.drawRoundedRect(QRectF(qreal(pw)/2+1, qreal(pw)/2+1, d->rectImage.width()-(pw+1), d->rectImage.height()-(pw+1)), d->radius, d->radius);
            else
                p.drawRoundedRect(QRectF(qreal(pw)/2, qreal(pw)/2, d->rectImage.width()-pw, d->rectImage.height()-pw), d->radius, d->radius);

            // end painting before inserting pixmap
            // to pixmap cache to avoid a deep copy
            p.end();
            QPixmapCache::insert(key, d->rectImage);
        }
    }
}

// Set waveform sample rate.
void SpikePlot_CV::setSampleRate(double newSampleRate)
{
    // Calculate time step, in msec.
    tStepMsec = 1000.0 / newSampleRate;

    // Calculate number of time steps in 3 msec sample.
    totalTSteps = qCeil(3.0 / tStepMsec) + 1;

    // Calculate number of time steps in the 1 msec pre-trigger
    // display interval.
    preTriggerTSteps = qCeil(1.0 / tStepMsec);

    // Clear old waveforms since the sample rate has changed.
    numSpikeWaveforms = 0;
    startingNewChannel = true;
}

/*virtual*/
int ListItemContainer::maxItemCountInItemBuffer() const
{
    int count = AbstractItemContainer::maxItemCountInItemBuffer();

    if (count > 0) {
        int currentItemCount = m_items.count();
        qreal heightOfOneItem = 0;
        if (currentItemCount > 0)
        {
            heightOfOneItem = m_layout->effectiveSizeHint(Qt::PreferredSize).height() / currentItemCount;
        }
        int guess = 0;
        if( heightOfOneItem <= 0 ) {
            if (m_prototype) {
                heightOfOneItem = m_prototype->effectiveSizeHint(Qt::PreferredSize).height();
            }
            else
                heightOfOneItem = 50; // TODO magic number, do we have better guess if prototype is not set?
        }
        if (heightOfOneItem > 0) {
            guess = qCeil(m_itemView->boundingRect().height() / heightOfOneItem) + m_bufferSize;

            if (guess < currentItemCount) {
                if( guess > currentItemCount-2) { // TODO magic number here, Can we use buffer size?
                    guess = currentItemCount;
                }
            }
        }
        count = qMin(guess, count);
    }
    return count;
}

void Downloader::getTags()
{
	if (m_sites->empty())
	{
		std::cerr << "No valid source found" << std::endl;
		return;
	}

	m_waiting = 0;
	m_cancelled = false;

	for (int i = 0; i < m_sites->size(); ++i)
	{
		int pages = qCeil((float)m_max / m_perpage);
		if (pages <= 0 || m_perpage <= 0 || m_max <= 0)
			pages = 1;
		Site *site = m_sites->at(i);
		connect(site, &Site::finishedLoadingTags, this, &Downloader::finishedLoadingTags);
		for (int p = 0; p < pages; ++p)
		{
			m_pagesP->append(QPair<Site*, int>(site, m_page + p));
			m_opagesP->append(QPair<Site*, int>(site, m_page + p));
			m_waiting++;
		}
	}

	loadNext();
}

static double ceil_with_tolerance( double value )
{
  if ( qAbs( value - qRound( value ) ) < 1e-6 )
    return qRound( value );
  else
    return qCeil( value );
}

void SingleCellViewGraphPanelPlotWidget::optimiseAxis(const int &pAxisId,
                                                      double &pMin,
                                                      double &pMax) const
{
    // Make sure that the given values are different

    if (pMin == pMax) {
        // The given values are the same, so update them so that we can properly
        // optimise them below

        double powerValue = pMin?qFloor(log10(qAbs(pMin)))-1.0:0.0;

        pMin = pMin-pow(10.0, powerValue);
        pMax = pMax+pow(10.0, powerValue);
    }

    // Optimise the axis' values so that they fall onto a factor of the axis'
    // minor step

    uint base = axisScaleEngine(pAxisId)->base();
    double majorStep = QwtScaleArithmetic::divideInterval(pMax-pMin,
                                                          axisMaxMajor(pAxisId),
                                                          base);
    double minorStep = QwtScaleArithmetic::divideInterval(majorStep,
                                                          axisMaxMinor(pAxisId),
                                                          base);

    pMin = qFloor(pMin/minorStep)*minorStep;
    pMax = qCeil(pMax/minorStep)*minorStep;
}

//--------------------------------------------------------------------------------------------------
//	FUNCTION: paint
//--------------------------------------------------------------------------------------------------
void QProgressBarDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
	double progress = index.data(QExecutableModel::ProgressRole).toDouble() * 100;
	if (std::isnan(progress) || progress <= 0.0 || progress >= 100.0)
	{
		QStyledItemDelegate::paint(painter, option, index);
	}
	else
	{
		const QFontMetrics &fm = option.fontMetrics;
		auto height = qMin(qCeil(QFontMetricsF(fm).height()) + 2, option.rect.height());
		int adjust = (option.rect.height() - height) / 2;

		double progress = index.data(QExecutableModel::ProgressRole).toDouble() * 100;

		QStyleOptionProgressBar progressBarOption;
		progressBarOption.rect = option.rect.adjusted(2, adjust, -2, -adjust);
		progressBarOption.rect.setWidth(option.rect.width() - 2 * 2);
		progressBarOption.minimum = 0;
		progressBarOption.maximum = 100;
		progressBarOption.progress = progress;

		if (option.state & QStyle::State_Selected)
		{
			painter->setBrush(option.palette.highlightedText());
		}

		QApplication::style()->drawControl(QStyle::CE_ProgressBar,
			&progressBarOption, painter);
	}
}

void LanczosShader::createKernel(float delta, int *size)
{
    const float a = 2.0;

    // The two outermost samples always fall at points where the lanczos
    // function returns 0, so we'll skip them.
    const int sampleCount = qBound(3, qCeil(delta * a) * 2 + 1 - 2, 29);
    const int center = sampleCount / 2;
    const int kernelSize = center + 1;
    const float factor = 1.0 / delta;

    QVector<float> values(kernelSize);
    float sum = 0;

    for (int i = 0; i < kernelSize; i++) {
        const float val = lanczos(i * factor, a);
        sum += i > 0 ? val * 2 : val;
        values[i] = val;
    }

    memset(m_kernel, 0, 16 * sizeof(QVector4D));

    // Normalize the kernel
    for (int i = 0; i < kernelSize; i++) {
        const float val = values[i] / sum;
        m_kernel[i] = QVector4D(val, val, val, val);
    }

    *size = kernelSize;
}

/*!
  \brief Return a minimum size hint
  \warning The return value depends on the font and the scale.
  \sa sizeHint()
*/
QSize QwtThermo::minimumSizeHint() const
{
    int w = 0, h = 0;

    if ( d_data->scalePos != NoScale )
    {
        const int sdExtent = qCeil( scaleDraw()->extent( font() ) );
        const int sdLength = scaleDraw()->minLength( font() );

        w = sdLength;
        h = d_data->thermoWidth + sdExtent +
            d_data->borderWidth + d_data->scaleDist;

    }
    else // no scale
    {
        w = 200;
        h = d_data->thermoWidth;
    }

    if ( d_data->orientation == Qt::Vertical )
        qSwap( w, h );

    w += 2 * d_data->borderWidth;
    h += 2 * d_data->borderWidth;

    return QSize( w, h );
}

void TextDocument::drawBackground(QPainter* painter, const QRect& bounds)
{
    if (d.highlights.isEmpty() && d.lowlight == -1)
        return;

    const int margin = qCeil(documentMargin());
    const QAbstractTextDocumentLayout* layout = documentLayout();

    static QPointer<TextLowlight> lowlightFrame = 0;
    if (!lowlightFrame)
        lowlightFrame = new TextLowlight(static_cast<QWidget*>(painter->device()));

    static QPointer<TextHighlight> highlightFrame = 0;
    if (!highlightFrame)
        highlightFrame = new TextHighlight(static_cast<QWidget*>(painter->device()));

    if (d.lowlight != -1) {
        const QAbstractTextDocumentLayout* layout = documentLayout();
        const int margin = qCeil(documentMargin());
        const QTextBlock to = findBlockByNumber(d.lowlight);
        if (to.isValid()) {
            QRect br = layout->blockBoundingRect(to).toAlignedRect();
            br.setTop(0);
            if (bounds.intersects(br)) {
                br.adjust(-margin - 1, 0, margin + 1, 2);
                painter->translate(br.topLeft());
                lowlightFrame->setGeometry(br);
                lowlightFrame->render(painter);
                painter->translate(-br.topLeft());
            }
        }
    }

    foreach (int highlight, d.highlights) {
        QTextBlock block = findBlockByNumber(highlight);
        if (block.isValid()) {
            QRect br = layout->blockBoundingRect(block).toAlignedRect();
            if (bounds.intersects(br)) {
                br.adjust(-margin - 1, 0, margin + 1, 2);
                painter->translate(br.topLeft());
                highlightFrame->setGeometry(br);
                highlightFrame->render(painter);
                painter->translate(-br.topLeft());
            }
        }
    }
}

lmcImagePicker::lmcImagePicker(
        QWidget *parent,
        QList<QString>* source,
        int picSize,
        int columns,
        int* selected,
        int actionIndex )
    : QTableWidget(parent)
{
	setMouseTracking(true);

	setBackgroundRole(QPalette::Window);
	setIconSize(QSize(picSize, picSize));
	setFrameShape(QFrame::NoFrame);
	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	setEditTriggers(QAbstractItemView::NoEditTriggers);
	setSelectionMode(QAbstractItemView::NoSelection);
	setShowGrid(false);
	horizontalHeader()->setVisible(false);
	verticalHeader()->setVisible(false);
	setStyleSheet("QTableWidget { padding: 4px }");	// padding around table

	max_col = columns;
	int max_row = qCeil(source->count() / (qreal)max_col);

	setColumnCount(max_col);
	setRowCount(max_row);

	int cellSize = picSize + 8;
	verticalHeader()->setDefaultSectionSize(cellSize);
	verticalHeader()->setMinimumSectionSize(cellSize);
	horizontalHeader()->setDefaultSectionSize(cellSize);
	horizontalHeader()->setMinimumSectionSize(cellSize);

	//	set min and max size of table, with padding included
	setMinimumSize(max_col * cellSize + 8, max_row * cellSize + 8);
	setMaximumSize(max_col * cellSize + 8, max_row * cellSize + 8);

	for(int i = 0; i < max_row; i++) {
		for(int j = 0; j < max_col; j++) {
			int k = (i * max_col) + j;

			QTableWidgetItem* item = new QTableWidgetItem();
			item->setData(TypeRole, 0);
			if(k < source->count()) {
				item->setIcon(QIcon(source->value(k)));
				item->setData(TypeRole, 1);
				item->setSizeHint(QSize(picSize, picSize));
				item->setBackground(this->palette().window());
			}
			setItem(i, j, item);
		}
	}

	this->actionIndex = actionIndex;
	this->selected = selected;
	this->hoverItem = NULL;
}