C++ QPainter::setTransform方法代码示例

void PaintedWindow::orientationChanged(Qt::ScreenOrientation newOrientation)
{
    if (contentOrientation() == newOrientation)
        return;

    if (m_animation->state() == QAbstractAnimation::Running) {
        m_nextTargetOrientation = newOrientation;
        return;
    }

    QRect rect(0, 0, width(), height());

    m_prevImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
    m_nextImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);
    m_prevImage.fill(0);
    m_nextImage.fill(0);

    QPainter p;
    p.begin(&m_prevImage);
    p.setTransform(screen()->transformBetween(contentOrientation(), screen()->orientation(), rect));
    paint(&p, screen()->mapBetween(contentOrientation(), screen()->orientation(), rect));
    p.end();

    p.begin(&m_nextImage);
    p.setTransform(screen()->transformBetween(newOrientation, screen()->orientation(), rect));
    paint(&p, screen()->mapBetween(newOrientation, screen()->orientation(), rect));
    p.end();

    m_deltaRotation = screen()->angleBetween(newOrientation, contentOrientation());
    if (m_deltaRotation > 180)
        m_deltaRotation = 180 - m_deltaRotation;

    m_targetOrientation = newOrientation;
    m_animation->start();
}

void TextureMapperQt::drawTexture(const BitmapTexture& texture, const FloatRect& targetRect, const TransformationMatrix& matrix, float opacity, const BitmapTexture* maskTexture)
{
    const BitmapTextureQt& textureQt = static_cast<const BitmapTextureQt&>(texture);
    QPainter* painter = m_painter;
    QPixmap pixmap = textureQt.m_pixmap;
    if (m_currentSurface)
        painter = &m_currentSurface->m_painter;

    if (maskTexture && maskTexture->isValid()) {
        const BitmapTextureQt* mask = static_cast<const BitmapTextureQt*>(maskTexture);
        QPixmap intermediatePixmap(pixmap.size());
        intermediatePixmap.fill(Qt::transparent);
        QPainter maskPainter(&intermediatePixmap);
        maskPainter.setCompositionMode(QPainter::CompositionMode_Source);
        maskPainter.drawPixmap(0, 0, pixmap);
        maskPainter.setCompositionMode(QPainter::CompositionMode_DestinationIn);
        maskPainter.drawPixmap(QRect(0, 0, pixmap.width(), pixmap.height()), mask->m_pixmap, mask->sourceRect());
        maskPainter.end();
        pixmap = intermediatePixmap;
    }

    const qreal prevOpacity = painter->opacity();
    const QTransform prevTransform = painter->transform();
    painter->setOpacity(opacity);
    painter->setTransform(matrix, true);
    painter->drawPixmap(targetRect, pixmap, FloatRect(textureQt.sourceRect()));
    painter->setTransform(prevTransform);
    painter->setOpacity(prevOpacity);
}

void KWCopyShape::paint(QPainter &painter, const KoViewConverter &converter, KoShapePaintingContext &paintcontext)
{
    Q_ASSERT(m_original);

    //paint all child shapes
    KoShapeContainer* container = dynamic_cast<KoShapeContainer*>(m_original);
    if (container) {
        QList<KoShape*> sortedObjects = container->shapes();
        sortedObjects.append(m_original);
        qSort(sortedObjects.begin(), sortedObjects.end(), KoShape::compareShapeZIndex);

        // Do the following to revert the absolute transformation of the
        // container that is re-applied in shape->absoluteTransformation()
        // later on.  The transformation matrix of the container has already
        // been applied once before this function is called.
        QTransform baseMatrix = container->absoluteTransformation(&converter).inverted() * painter.transform();

        KWPage copypage = m_pageManager->page(this);
        Q_ASSERT(copypage.isValid());
        foreach(KoShape *shape, sortedObjects) {
            painter.save();
            if (shape != m_original) {
                painter.setTransform(shape->absoluteTransformation(&converter) * baseMatrix);
            }
            KoTextShapeData *data = qobject_cast<KoTextShapeData*>(shape->userData());
            if (data == 0) {
                shape->paint(painter, converter, paintcontext);
            }
            else {
                // Since the rootArea is shared between the copyShape and the originalShape we need to
                // temporary switch the used KoTextPage to be sure the proper page-numbers are displayed.
                KWPage originalpage = m_pageManager->page(shape);
                Q_ASSERT(originalpage.isValid());
                KoTextLayoutRootArea *area = data->rootArea();
                bool wasBlockChanges = false;
                if (area) {
                    // We need to block documentChanged() signals emitted cause for example page-variables
                    // may change there content to result in us marking root-areas dirty for relayout else
                    // we could end in an infinite relayout ping-pong.
                    wasBlockChanges = area->documentLayout()->changesBlocked();
                    area->documentLayout()->setBlockChanges(true);
                    area->setPage(new KWPage(copypage));
                }
                shape->paint(painter, converter, paintcontext);
                if (area) {
                    area->setPage(new KWPage(originalpage));
                    area->documentLayout()->setBlockChanges(wasBlockChanges);
                }
            }
            painter.restore();
            if (shape->stroke()) {
                painter.save();
                painter.setTransform(shape->absoluteTransformation(&converter) * baseMatrix);
                shape->stroke()->paint(shape, painter, converter);
                painter.restore();
            }
        }
    } else {

void KisCanvasWidgetBase::drawDecorations(QPainter & gc, const QRect &updateWidgetRect) const
{
    gc.save();
    if (!m_d->canvas) {
        dbgFile<<"canvas doesn't exist, in canvas widget base!";
    }
    // Setup the painter to take care of the offset; all that the
    // classes that do painting need to keep track of is resolution
    gc.setRenderHint(QPainter::Antialiasing);
    gc.setRenderHint(QPainter::TextAntialiasing);

    // This option does not do anything anymore with Qt4.6, so don't reenable it since it seems to break display
    // http://www.archivum.info/[email protected]/2010-01/00481/Re:-(Qt-interest)-Is-QPainter::HighQualityAntialiasing-render-hint-broken-in-Qt-4.6.html
    // gc.setRenderHint(QPainter::HighQualityAntialiasing);

    gc.setRenderHint(QPainter::SmoothPixmapTransform);


    gc.save();
    gc.setClipRect(updateWidgetRect);

    QTransform transform = m_d->coordinatesConverter->flakeToWidgetTransform();
    gc.setTransform(transform);

    // Paint the shapes (other than the layers)
    m_d->canvas->globalShapeManager()->paint(gc, *m_d->viewConverter, false);

    // draw green selection outlines around text shapes that are edited, so the user sees where they end
    gc.save();
    QTransform worldTransform = gc.worldTransform();
    gc.setPen( Qt::green );

    Q_FOREACH (KoShape *shape, canvas()->shapeManager()->selection()->selectedShapes()) {
        if (shape->shapeId() == "ArtisticText" || shape->shapeId() == "TextShapeID") {
            gc.setWorldTransform(shape->absoluteTransformation(m_d->viewConverter) * worldTransform);
            KoShape::applyConversion(gc, *m_d->viewConverter);
            gc.drawRect(QRectF(QPointF(), shape->size()));
        }
    }
    gc.restore();

    // Draw text shape over canvas while editing it, that's needs to show the text selection correctly
    QString toolId = KoToolManager::instance()->activeToolId();
    if (toolId == "ArtisticTextTool" || toolId == "TextTool") {
        gc.save();
        gc.setPen(Qt::NoPen);
        gc.setBrush(Qt::NoBrush);
        Q_FOREACH (KoShape *shape, canvas()->shapeManager()->selection()->selectedShapes()) {
            if (shape->shapeId() == "ArtisticText" || shape->shapeId() == "TextShapeID") {
                KoShapePaintingContext  paintContext(canvas(), false);
                gc.save();
                gc.setTransform(shape->absoluteTransformation(m_d->viewConverter) * gc.transform());
                canvas()->shapeManager()->paintShape(shape, gc, *m_d->viewConverter, paintContext);
                gc.restore();
            }
        }
        gc.restore();
    }

void TextureMapperQt::beginClip(const TransformationMatrix& matrix, const FloatRect& rect)
{
    QPainter* painter = currentPainter();
    painter->save();
    QTransform prevTransform = painter->transform();
    painter->setTransform(matrix, false);
    painter->setClipRect(rect);
    painter->setTransform(prevTransform, false);
}

void KoCreatePathTool::paint(QPainter &painter, const KoViewConverter &converter)
{
    Q_D(KoCreatePathTool);
    if (pathStarted()) {
        KoShapeStroke *stroke(createStroke());
        if (stroke) {
            d->shape->setStroke(stroke);
        }
        painter.save();
        paintPath(*(d->shape), painter, converter);
        painter.restore();

        painter.save();

        painter.setTransform(d->shape->absoluteTransformation(&converter) * painter.transform());

        KoShape::applyConversion(painter, converter);

        painter.setPen(QPen(Qt::blue, 0));
        painter.setBrush(Qt::white);   //TODO make configurable

        const bool firstPoint = (d->firstPoint == d->activePoint);
        if (d->pointIsDragged || firstPoint) {
            const bool onlyPaintActivePoints = false;
            KoPathPoint::PointTypes paintFlags = KoPathPoint::ControlPoint2;
            if (d->activePoint->activeControlPoint1())
                paintFlags |= KoPathPoint::ControlPoint1;
            d->activePoint->paint(painter, d->handleRadius, paintFlags, onlyPaintActivePoints);
        }


        // check if we have to color the first point
        if (d->mouseOverFirstPoint)
            painter.setBrush(Qt::red);     //TODO make configurable
        else
            painter.setBrush(Qt::white);   //TODO make configurable

        d->firstPoint->paint(painter, d->handleRadius, KoPathPoint::Node);

        painter.restore();
    }

    if (d->hoveredPoint) {
        painter.save();
        painter.setTransform(d->hoveredPoint->parent()->absoluteTransformation(&converter), true);
        KoShape::applyConversion(painter, converter);
        painter.setPen(QPen(Qt::blue, 0));
        painter.setBrush(Qt::white);   //TODO make configurable
        d->hoveredPoint->paint(painter, d->handleRadius, KoPathPoint::Node);
        painter.restore();
    }
    painter.save();
    KoShape::applyConversion(painter, converter);
    canvas()->snapGuide()->paint(painter, converter);
    painter.restore();
}

void PerspectivePixmap::drawUsingPainter(QPainter &painter)
{
    if (!mPixMap.isNull()) {
        qreal opOld = painter.opacity();
        QTransform transOld = painter.transform();
        QTransform trans = painter.transform();
        trans.scale(1, -1);
        painter.setTransform(trans);
        painter.setOpacity(0.8);
        painter.drawPixmap(-mXOffset / mScale, -mYOffset / mScale,
                           mPixMap.width() / mScale, mPixMap.height() / mScale, mPixMap);
        painter.setOpacity(opOld);
        painter.setTransform(transOld);
    }
}

void PaintMethods::paintText(const DebugDrawing::Text& element, QPainter& painter)
{
  QFont font("Arial", element.fontSize, QFont::Normal);
  pen.setColor(QColor(element.penColor.r, element.penColor.g, element.penColor.b, element.penColor.a));
  painter.setPen(pen);
  painter.setFont(font);

  QTransform trans(painter.transform());
  QTransform newTrans;
  newTrans.translate(trans.dx(), trans.dy());
  newTrans.scale(std::abs(trans.m11()), std::abs(trans.m22()));
  painter.setTransform(newTrans);
  painter.drawText(QPoint(element.x * (int)sgn(trans.m11()), element.y * (int)sgn(trans.m22())), QObject::tr((const char*)(&element + 1)));
  painter.setTransform(trans);
}

void
Panner::drawItems(QPainter *painter, int numItems,
                  QGraphicsItem *items[],
                  const QStyleOptionGraphicsItem options[])
{
    Profiler profiler("Panner::drawItems");

    if (m_cache.size() != viewport()->size()) {

        QGraphicsScene *s = scene();
        if (!s) return;
        PannerScene *ps = static_cast<PannerScene *>(s);

        m_cache = QPixmap(viewport()->size());
        m_cache.fill(Qt::transparent);
        QPainter cachePainter;
        cachePainter.begin(&m_cache);
        cachePainter.setTransform(viewportTransform());
        ps->drawItems(&cachePainter, numItems, items, options);
        cachePainter.end();
    }

    painter->save();
    painter->setTransform(QTransform());
    painter->drawPixmap(0, 0, m_cache);
    painter->restore();
}

void QQuickShapeSoftwareRenderNode::render(const RenderState *state)
{
    if (m_sp.isEmpty())
        return;

    QSGRendererInterface *rif = m_item->window()->rendererInterface();
    QPainter *p = static_cast<QPainter *>(rif->getResource(m_item->window(), QSGRendererInterface::PainterResource));
    Q_ASSERT(p);

    const QRegion *clipRegion = state->clipRegion();
    if (clipRegion && !clipRegion->isEmpty())
        p->setClipRegion(*clipRegion, Qt::ReplaceClip); // must be done before setTransform

    p->setTransform(matrix()->toTransform());
    p->setOpacity(inheritedOpacity());

    for (const ShapePathRenderData &d : qAsConst(m_sp)) {
        if (d.hidden) {
            continue;
        }

//        QTransform oldTransform = p->transform();
//        p->setTransform(d.transform, true);

//        p->setOpacity(inheritedOpacity() * d.opacity);
        p->setPen(d.strokeWidth >= 0.0f && d.pen.color() != Qt::transparent ? d.pen : Qt::NoPen);
        p->setBrush(d.brush.color() != Qt::transparent ? d.brush : Qt::NoBrush);
        p->drawPath(d.path);

//        p->setTransform(oldTransform);
    }
}

void girarder::rotarplayer(tam grados)
{

    QPixmap sourceImage(*player->pixmap());
    QPixmap rotatePixmap(sourceImage.size());
    rotatePixmap.fill(Qt::transparent);

    QTransform transform;
    transform.translate(sourceImage.size().width() / 2, sourceImage.size().height() / 2);

    transform.rotate(grados);

    transform.translate(-sourceImage.size().width() / 2, -sourceImage.size().height() / 2);

    QPainter p;

    p.begin(&rotatePixmap);
    p.setTransform(transform);
    p.drawPixmap(0, 0, sourceImage);
    p.end();

    rotatePixmap.save(":/temp.png");

    player->setPixmap(rotatePixmap);
    player->giro = player->giro + grados;

}

void KarbonCalligraphyTool::paint(QPainter &painter, const KoViewConverter &converter)
{
    if (m_selectedPath) {
        painter.save();
        painter.setRenderHints(QPainter::Antialiasing, false);
        painter.setPen(Qt::red);   // TODO make configurable
        QRectF rect = m_selectedPath->boundingRect();
        QPointF p1 = converter.documentToView(rect.topLeft());
        QPointF p2 = converter.documentToView(rect.bottomRight());
        painter.drawRect(QRectF(p1, p2));
        painter.restore();
    }

    if (!m_shape) {
        return;
    }

    painter.save();

    painter.setTransform(m_shape->absoluteTransformation(&converter) *
                         painter.transform());
    KoShapePaintingContext paintContext; //FIXME
    m_shape->paint(painter, converter, paintContext);

    painter.restore();
}

void GraphicsContext3DPrivate::paintToTextureMapper(TextureMapper* textureMapper, const FloatRect& targetRect, const TransformationMatrix& matrix, float opacity)
{
    m_context->markLayerComposited();
    blitMultisampleFramebufferAndRestoreContext();

    if (textureMapper->accelerationMode() == TextureMapper::OpenGLMode) {
        TextureMapperGL* texmapGL = static_cast<TextureMapperGL*>(textureMapper);
        TextureMapperGL::Flags flags = TextureMapperGL::ShouldFlipTexture | (m_context->m_attrs.alpha ? TextureMapperGL::ShouldBlend : 0);
        IntSize textureSize(m_context->m_currentWidth, m_context->m_currentHeight);
        texmapGL->drawTexture(m_context->m_texture, flags, textureSize, targetRect, matrix, opacity);
        return;
    }

    // Alternatively read pixels to a memory buffer.
    GraphicsContext* context = textureMapper->graphicsContext();
    QPainter* painter = context->platformContext();
    painter->save();
    painter->setTransform(matrix);
    painter->setOpacity(opacity);

    const int height = m_context->m_currentHeight;
    const int width = m_context->m_currentWidth;

    painter->beginNativePainting();
    makeCurrentIfNeeded();
    glBindFramebuffer(GL_FRAMEBUFFER, m_context->m_fbo);
    QImage offscreenImage = qt_gl_read_framebuffer(QSize(width, height), true, true);
    glBindFramebuffer(GL_FRAMEBUFFER, m_context->m_state.boundFBO);

    painter->endNativePainting();

    painter->drawImage(targetRect, offscreenImage);
    painter->restore();
}

void PaintMethods::paintOrigin(const DebugDrawing::Origin& element, QPainter& painter, const QTransform& baseTrans)
{
  QTransform trans(baseTrans);
  trans.translate(qreal(element.x), qreal(element.y));
  trans.rotateRadians(qreal(element.angle));
  painter.setTransform(trans);
}

void MarkerMapObject::paint(QPainter &painter, QRect view, int scale) {

	// Save the painter state for this paint session
	// so that it can be restored after without influencing other objects
	painter.save(); {

		// Translate, scale, and rotate...
		QTransform t;
		t.scale(1.0/scale, 1.0/scale);
		t.translate(x - view.x()*scale, view.height()*scale - y + view.y()*scale);
		painter.setTransform(t);

		for(int index = 0; index < transformationCount; index++) {
			long arrowLength = 1000*scale;
			long ballSize = 20*scale;
			Vector2D a = transformation[index].trans();
			Vector2D b = (transformation[index] * Trafo2D::trans(0, arrowLength)).trans();
			painter.setPen(transformationColors[index]);
			QPen pen = painter.pen();
			pen.setWidth(2*scale);
			painter.setPen(pen);
			painter.drawLine(a.x(), -a.y(), b.x(), -b.y());
			painter.setBrush(QBrush(transformationColors[index]));
			painter.drawEllipse(a.x()-ballSize/2, -(a.y()+ballSize/2), ballSize, ballSize);
		}

	} painter.restore();
}