C++ QSvgRenderer::boundsOnElement方法代码示例

inline static QImage colorBlot(const QColor &color, int blotVariation, QSize *size, const QSize &requestedSize)
{
    QSvgRenderer *renderer = designRenderer();
    const static QString elementIdBase = QStringLiteral("colorblot");
    const static int variationsCnt = variationsCount(renderer, elementIdBase);
    const int actualVariation = (blotVariation % variationsCnt) + 1;
    const QString elementId = elementIdBase + QLatin1Char('_') + QString::number(actualVariation);
    const QString maskElementId = elementId + QStringLiteral("_mask");
    const QString highlightElementId = elementId + QStringLiteral("_highlight");
    const QRectF backgroundRect = renderer->boundsOnElement(idPrefix + elementId);
    QSize resultSize = backgroundRect.size().toSize();
    if (size)
        *size = resultSize;
    resultSize.scale(requestedSize, Qt::KeepAspectRatio);
    const qreal scaleFactor = resultSize.width() / backgroundRect.width();
    QTransform transform =
            QTransform::fromScale(scaleFactor, scaleFactor);
    transform.translate(-backgroundRect.topLeft().x(), -backgroundRect.topLeft().y());
    QImage result(resultSize, QImage::Format_ARGB32);
    if (result.isNull())
        qDebug() << Q_FUNC_INFO << "clock image is NULL! Variation:" << blotVariation;
    result.fill(0);
    QPainter p(&result);
    p.setTransform(transform);
    renderer->render(&p, idPrefix + maskElementId, renderer->boundsOnElement(idPrefix + maskElementId));
    p.save();
    p.setCompositionMode(QPainter::CompositionMode_SourceIn);
    p.fillRect(backgroundRect, color);
    p.restore();
    renderer->render(&p, idPrefix + highlightElementId, renderer->boundsOnElement(idPrefix + highlightElementId));
    return result;
}

ElementVariationList elementsWithSizes(const QString &elementBase)
{
    ElementVariationList result;
    QSvgRenderer *renderer = designRenderer();
    ElementVariations element;
    element.widthToHeightRatio = -1;
    for (int i = 1; ; i++) {
        const QString id = elementBase + QLatin1Char('_') + QString::number(i);
        if (!renderer->elementExists(idPrefix + id))
            break;
        const QSizeF size = renderer->boundsOnElement(idPrefix + id).size();
        const qreal widthToHeightRatio = size.width() / size.height();
        if (!qFuzzyCompare(widthToHeightRatio, element.widthToHeightRatio)) {
            if (element.widthToHeightRatio > 0) // Check, is it is the first element
                result.append(element);
            element.widthToHeightRatio = widthToHeightRatio;
            element.elementIds.clear();
        }
        element.elementIds.append(id);
    }
    if (!element.elementIds.isEmpty())
        result.append(element);
    qSort(result);
    return result;
}

QRectF minigis::svgRect(QSvgRenderer &render, const QString &cls, const QPointF &p, const qreal &svgSize)
{
    QSizeF element = render.boundsOnElement(cls).size(); // типовой размер
    if (element.width() > element.height())
        element = QSizeF(SVGsize, qreal(element.height() / element.width()) * SVGsize);
    else
        element = QSizeF(qreal(element.width() / element.height()) * SVGsize, SVGsize);

    QRectF rgn(
                p,
                element * svgSize
                );
    return rgn;
}

QImage SvgElementProvider::requestImage(const QString& id, QSize* size, const QSize& requestedSize)
{
	// Resolve URL
	QUrl url = QUrl(id);
	if (url.isRelative() && !mBaseUrl.isEmpty())
		url = mBaseUrl.resolved(url);

	if (!url.isValid())
		return placeholder(QString("Invalid URL\nBase: %1\nInput: %2").arg(mBaseUrl.toString()).arg(id), requestedSize);

	// Make a filename from the given URL
	QString imagepath = QQmlFile::urlToLocalFileOrQrc(url);
	// Fragment is used to specify SVG element
	QString elementId = url.fragment();

	// Load image
	QSvgRenderer renderer;
	if (!renderer.load(imagepath))
	{
		qWarning() << "Unable to load image:" << imagepath;
		return placeholder(QStringLiteral("Unable to load image:\n") + imagepath, requestedSize);
	}

	// Check whether requested element exists
	if (!elementId.isEmpty() && !renderer.elementExists(elementId))
		return placeholder(QStringLiteral("Unable to find element:\n") + elementId + "\nin image:\n" + imagepath,
		                   requestedSize);

	// Get image or element size
	QSize itemSize = elementId.isEmpty() ? renderer.defaultSize() : renderer.boundsOnElement(elementId).size().toSize();

	if (size)
		*size = itemSize;

	// Create image
	QImage image(requestedSize.width() > 0 ? requestedSize.width() : itemSize.width(),
	             requestedSize.height() > 0 ? requestedSize.height() : itemSize.height(),
	             QImage::Format_ARGB32_Premultiplied);
	image.fill(Qt::transparent);

	// Paint svg or element
	QPainter p(&image);
	if (elementId.isEmpty())
		renderer.render(&p);
	else
		renderer.render(&p, elementId);

	return image;
}

const QImage gradientImage(DesignElementType type)
{
    QSvgRenderer *renderer = designRenderer();
    const QString gradientId = idPrefix + (type == DesignElementTypeButton ? buttonString : frameString) + QStringLiteral("gradient");
    Q_ASSERT(renderer->boundsOnElement(gradientId).size().toSize() == QSize(256, 1));
    QImage result(256, 1, QImage::Format_ARGB32);
    result.fill(0);
    QPainter p(&result);
    renderer->render(&p, gradientId, result.rect());
#if 0
    // for debugging
    p.fillRect(0, 0, 16, 1, Qt::red);
    p.fillRect(120, 0, 16, 1, Qt::green);
    p.fillRect(240, 0, 16, 1, Qt::blue);
#endif
    return result;
}

/*!
  \fn SvgImageProvider::scaledElementBounds(const QString &svgFile, const QString &element)

  Returns the bound of \a element in logical coordinates,
  scalled to the default size of svg document (so the bounds of whole doc would be (0,0,1,1) ).
*/
QRectF SvgImageProvider::scaledElementBounds(const QString &svgFile, const QString &elementName)
{
    QSvgRenderer *renderer = loadRenderer(svgFile);

    if (!renderer)
        return QRectF();

    if (!renderer->elementExists(elementName)) {
        qWarning() << "invalid element:" << elementName << "of" << svgFile;
        return QRectF();
    }

    QRectF elementBounds = renderer->boundsOnElement(elementName);
    QMatrix matrix = renderer->matrixForElement(elementName);
    elementBounds = matrix.mapRect(elementBounds);

    QSize docSize = renderer->defaultSize();
    return QRectF(elementBounds.x()/docSize.width(),
                  elementBounds.y()/docSize.height(),
                  elementBounds.width()/docSize.width(),
                  elementBounds.height()/docSize.height());
}

QPixmap loadStamp( const QString& _name, const QSize& size, int iconSize )
{
    const QString name = _name.toLower();
    QSvgRenderer * r = 0;
    if ( ( r = s_data->svgStamps() ) && r->elementExists( name ) )
    {
        const QRectF stampElemRect = r->boundsOnElement( name );
        const QRectF stampRect( size.isValid() ? QRectF( QPointF( 0, 0 ), size ) : stampElemRect );
        QPixmap pixmap( stampRect.size().toSize() );
        pixmap.fill( Qt::transparent );
        QPainter p( &pixmap );
        r->render( &p, name );
        p.end();
        return pixmap;
    }
    QPixmap pixmap;
    const KIconLoader * il = iconLoader();
    QString path;
    const int minSize = iconSize > 0 ? iconSize : qMin( size.width(), size.height() );
    pixmap = il->loadIcon( name, KIconLoader::User, minSize, KIconLoader::DefaultState, QStringList(), &path, true );
    if ( path.isEmpty() )
        pixmap = il->loadIcon( name, KIconLoader::NoGroup, minSize );
    return pixmap;
}

 int heightOf(const QString & element, int value = 0) const
 {
     if (!svg->elementExists(element))
         return value;
     return svg->boundsOnElement(element).height();
 }

{
    foreach( const KCardTheme & theme, m_themes )
    {
        {
            QMutexLocker l( &m_haltMutex );
            if ( m_haltFlag )
                return;
        }

        QImage img( d->previewSize, QImage::Format_ARGB32 );
        img.fill( Qt::transparent );
        QPainter p( &img );

        QSvgRenderer renderer( theme.graphicsFilePath() );

        QSizeF size = renderer.boundsOnElement(QStringLiteral("back")).size();
        size.scale( 1.5 * d->baseCardSize.width(), d->baseCardSize.height(), Qt::KeepAspectRatio );

        qreal yPos = ( d->previewSize.height() - size.height() ) / 2;
        qreal spacingWidth = d->baseCardSize.width()
                             * ( d->previewSize.width() - d->previewLayout.size() * size.width() )
                             / ( d->previewSize.width() - d->previewLayout.size() * d->baseCardSize.width() );

        qreal xPos = 0;
        foreach ( const QList<QString> & pile, d->previewLayout )
        {
            foreach ( const QString & card, pile )
            {
                renderer.render( &p, card, QRectF( QPointF( xPos, yPos ), size ) );
                xPos += 0.3 * spacingWidth;
            }

{
    foreach( const KCardTheme & theme, m_themes )
    {
        {
            QMutexLocker l( &m_haltMutex );
            if ( m_haltFlag )
                return;
        }

        QImage img( d->previewSize, QImage::Format_ARGB32 );
        img.fill( Qt::transparent );
        QPainter p( &img );

        QSvgRenderer renderer( theme.graphicsFilePath() );

        QSizeF size = renderer.boundsOnElement("back").size();
        size.scale( 1.5 * d->baseCardSize.width(), d->baseCardSize.height(), Qt::KeepAspectRatio );

        qreal yPos = ( d->previewSize.height() - size.height() ) / 2;
        qreal spacingWidth = d->baseCardSize.width()
                             * ( d->previewSize.width() - d->previewLayout.size() * size.width() )
                             / ( d->previewSize.width() - d->previewLayout.size() * d->baseCardSize.width() );

        qreal xPos = 0;
        foreach ( const QList<QString> & pile, d->previewLayout )
        {
            foreach ( const QString & card, pile )
            {
                renderer.render( &p, card, QRectF( QPointF( xPos, yPos ), size ) );
                xPos += 0.3 * spacingWidth;
            }

ConfigAHRSWidget::ConfigAHRSWidget(QWidget *parent) : ConfigTaskWidget(parent)
{
    m_ahrs = new Ui_AHRSWidget();
    m_ahrs->setupUi(this);

    // Initialization of the Paper plane widget
    m_ahrs->sixPointsHelp->setScene(new QGraphicsScene(this));

    paperplane = new QGraphicsSvgItem();
    paperplane->setSharedRenderer(new QSvgRenderer());
    paperplane->renderer()->load(QString(":/configgadget/images/paper-plane.svg"));
    paperplane->setElementId("plane-horizontal");
    m_ahrs->sixPointsHelp->scene()->addItem(paperplane);
    m_ahrs->sixPointsHelp->setSceneRect(paperplane->boundingRect());

    // Initialization of the AHRS bargraph graph

    m_ahrs->ahrsBargraph->setScene(new QGraphicsScene(this));

    QSvgRenderer *renderer = new QSvgRenderer();
    ahrsbargraph = new QGraphicsSvgItem();
    renderer->load(QString(":/configgadget/images/ahrs-calib.svg"));
    ahrsbargraph->setSharedRenderer(renderer);
    ahrsbargraph->setElementId("background");
    ahrsbargraph->setObjectName("background");
    m_ahrs->ahrsBargraph->scene()->addItem(ahrsbargraph);
    m_ahrs->ahrsBargraph->setSceneRect(ahrsbargraph->boundingRect());

    // Initialize the 9 bargraph values:

    QMatrix lineMatrix = renderer->matrixForElement("accel_x");
    QRectF rect = lineMatrix.mapRect(renderer->boundsOnElement("accel_x"));
    qreal startX = rect.x();
    qreal startY = rect.y()+ rect.height();
    // maxBarHeight will be used for scaling it later.
    maxBarHeight = rect.height();
    // Then once we have the initial location, we can put it
    // into a QGraphicsSvgItem which we will display at the same
    // place: we do this so that the heading scale can be clipped to
    // the compass dial region.
    accel_x = new QGraphicsSvgItem();
    accel_x->setSharedRenderer(renderer);
    accel_x->setElementId("accel_x");
    m_ahrs->ahrsBargraph->scene()->addItem(accel_x);
    accel_x->setPos(startX, startY);
    accel_x->setTransform(QTransform::fromScale(1,0),true);

    lineMatrix = renderer->matrixForElement("accel_y");
    rect = lineMatrix.mapRect(renderer->boundsOnElement("accel_y"));
    startX = rect.x();
    startY = rect.y()+ rect.height();
    accel_y = new QGraphicsSvgItem();
    accel_y->setSharedRenderer(renderer);
    accel_y->setElementId("accel_y");
    m_ahrs->ahrsBargraph->scene()->addItem(accel_y);
    accel_y->setPos(startX,startY);
    accel_y->setTransform(QTransform::fromScale(1,0),true);

    lineMatrix = renderer->matrixForElement("accel_z");
    rect = lineMatrix.mapRect(renderer->boundsOnElement("accel_z"));
    startX = rect.x();
    startY = rect.y()+ rect.height();
    accel_z = new QGraphicsSvgItem();
    accel_z->setSharedRenderer(renderer);
    accel_z->setElementId("accel_z");
    m_ahrs->ahrsBargraph->scene()->addItem(accel_z);
    accel_z->setPos(startX,startY);
    accel_z->setTransform(QTransform::fromScale(1,0),true);

    lineMatrix = renderer->matrixForElement("gyro_x");
    rect = lineMatrix.mapRect(renderer->boundsOnElement("gyro_x"));
    startX = rect.x();
    startY = rect.y()+ rect.height();
    gyro_x = new QGraphicsSvgItem();
    gyro_x->setSharedRenderer(renderer);
    gyro_x->setElementId("gyro_x");
    m_ahrs->ahrsBargraph->scene()->addItem(gyro_x);
    gyro_x->setPos(startX,startY);
    gyro_x->setTransform(QTransform::fromScale(1,0),true);

    lineMatrix = renderer->matrixForElement("gyro_y");
    rect = lineMatrix.mapRect(renderer->boundsOnElement("gyro_y"));
    startX = rect.x();
    startY = rect.y()+ rect.height();
    gyro_y = new QGraphicsSvgItem();
    gyro_y->setSharedRenderer(renderer);
    gyro_y->setElementId("gyro_y");
    m_ahrs->ahrsBargraph->scene()->addItem(gyro_y);
    gyro_y->setPos(startX,startY);
    gyro_y->setTransform(QTransform::fromScale(1,0),true);


    lineMatrix = renderer->matrixForElement("gyro_z");
    rect = lineMatrix.mapRect(renderer->boundsOnElement("gyro_z"));
    startX = rect.x();
    startY = rect.y()+ rect.height();
    gyro_z = new QGraphicsSvgItem();
    gyro_z->setSharedRenderer(renderer);
    gyro_z->setElementId("gyro_z");
    m_ahrs->ahrsBargraph->scene()->addItem(gyro_z);
//.........这里部分代码省略.........

/**
   Supported id format: fileName[!elementName[?parameters]]
   where parameters may be:
   vslice=1:2;hslice=2:4 - use the 3rd horizontal slice of total 4 slices, slice numbering starts from 0
   borders=1 - 1 pixel wide transparent border

   requestedSize is related to the whole element size, even if slice is requested.

   usage:

   Image {
       source: "image://svg/pfd.svg!world"
   }
*/
QImage SvgImageProvider::requestImage(const QString &id, QSize *size, const QSize &requestedSize)
{
    QString svgFile = id;
    QString element;
    QString parameters;

    int separatorPos = id.indexOf('!');
    if (separatorPos != -1) {
        svgFile = id.left(separatorPos);
        element = id.mid(separatorPos+1);
    }

    int parametersPos = element.indexOf('?');
    if (parametersPos != -1) {
        parameters = element.mid(parametersPos+1);
        element = element.left(parametersPos);
    }

    int hSlicesCount = 0;
    int hSlice = 0;
    int vSlicesCount = 0;
    int vSlice = 0;
    int border = 0;
    if (!parameters.isEmpty()) {
        QRegExp hSliceRx("hslice=(\\d+):(\\d+)");
        if (hSliceRx.indexIn(parameters) != -1) {
            hSlice = hSliceRx.cap(1).toInt();
            hSlicesCount = hSliceRx.cap(2).toInt();
        }
        QRegExp vSliceRx("vslice=(\\d+):(\\d+)");
        if (vSliceRx.indexIn(parameters) != -1) {
            vSlice = vSliceRx.cap(1).toInt();
            vSlicesCount = vSliceRx.cap(2).toInt();
        }
        QRegExp borderRx("border=(\\d+)");
        if (borderRx.indexIn(parameters) != -1) {
            border = borderRx.cap(1).toInt();
        }
    }

    if (size)
        *size = QSize();

    QSvgRenderer *renderer = loadRenderer(svgFile);
    if (!renderer)
        return QImage();

    qreal xScale = 1.0;
    qreal yScale = 1.0;

    QSize docSize = renderer->defaultSize();

    if (!requestedSize.isEmpty()) {
        if (!element.isEmpty()) {
            QRectF elementBounds = renderer->boundsOnElement(element);
            xScale = qreal(requestedSize.width())/elementBounds.width();
            yScale = qreal(requestedSize.height())/elementBounds.height();
        } else if (!docSize.isEmpty()) {
            xScale = qreal(requestedSize.width())/docSize.width();
            yScale = qreal(requestedSize.height())/docSize.height();
        }
    }

    //keep the aspect ratio
    //TODO: how to configure it? as a part of image path?
    xScale = yScale = qMin(xScale, yScale);

    if (!element.isEmpty()) {
        if (!renderer->elementExists(element)) {
            qWarning() << "invalid element:" << element << "of" << svgFile;
            return QImage();
        }

        QRectF elementBounds = renderer->boundsOnElement(element);
        int elementWidth = qRound(elementBounds.width() * xScale);
        int elementHeigh = qRound(elementBounds.height() * yScale);
        int w = elementWidth;
        int h = elementHeigh;
        int x = 0;
        int y = 0;

        if (hSlicesCount > 1) {
            x = (w*hSlice)/hSlicesCount;
            w = (w*(hSlice+1))/hSlicesCount - x;
        }

//.........这里部分代码省略.........

 int widthOf(const QString & element, int value = 0) const
 {
     if (!svg->elementExists(element))
         return value;
     return svg->boundsOnElement(element).width();
 }