C++ QRadialGradient::focalPoint方法代码示例

void BoxStyle::unoptimizedPaint(QPainter* painter, int xOffset, int yOffset, int contentBoxWidth,
				int contentBoxHeight) const
{
	qreal x = xOffset;
	qreal y = yOffset;

	int outlineWidth = outline_.style()!=Qt::NoPen ? outline_.width() : 0;
	// Move the figure when using antialiasing. The outline will start at a pixel boundary. This makes it sharper.
	if ( painter->testRenderHint(QPainter::Antialiasing) || painter->testRenderHint(QPainter::HighQualityAntialiasing) )
		if ( outline().style() != Qt::NoPen)
		{
			x = xOffset + outlineWidth/2.0;
			y = yOffset + outlineWidth/2.0;
		}

	// Draw shadow
	if ( shadow() != Qt::NoBrush )
	{
		painter->setPen(Qt::NoPen);
		painter->setBrush(shadow());
		painter->drawPath(getRectanglePath(xOffset + xShadowOffset(), yOffset + yShadowOffset(),
				contentBoxWidth, contentBoxHeight));
	}

	// Draw box.
	painter->setPen(outline());

	// Set the brush and fix the gradient if needed.
	if ( background().style() == Qt::LinearGradientPattern
			&& background().gradient()->coordinateMode() == QGradient::LogicalMode )
	{
		QLinearGradient g = *(static_cast<const QLinearGradient*> (background().gradient()));
		g.setStart(x + g.start().x(), y + g.start().y());
		g.setFinalStop(x + g.finalStop().x(), y + g.finalStop().y());
		painter->setBrush(g);

	}
	else if ( background().style()  == Qt::RadialGradientPattern
			&& background().gradient()->coordinateMode() == QGradient::LogicalMode )
	{
		QRadialGradient g = *(static_cast<const QRadialGradient*> (background().gradient()));
		g.setCenter(x + g.center().x(), y + g.center().y());
		g.setFocalPoint(x + g.focalPoint().x(), y + g.focalPoint().y());
		painter->setBrush(g);
	}
	else
	{
		painter->setBrush(background());
	}

	painter->drawPath(getRectanglePath(x, y, contentBoxWidth - outlineWidth, contentBoxHeight - outlineWidth));
}

KoStopGradient * KoStopGradient::fromQGradient(QGradient * gradient)
{
    if (! gradient)
        return 0;

    KoStopGradient * newGradient = new KoStopGradient("");
    newGradient->setType(gradient->type());
    newGradient->setSpread(gradient->spread());

    switch (gradient->type()) {
    case QGradient::LinearGradient: {
        QLinearGradient * g = static_cast<QLinearGradient*>(gradient);
        newGradient->m_start = g->start();
        newGradient->m_stop = g->finalStop();
        newGradient->m_focalPoint = g->start();
        break;
    }
    case QGradient::RadialGradient: {
        QRadialGradient * g = static_cast<QRadialGradient*>(gradient);
        newGradient->m_start = g->center();
        newGradient->m_stop = g->center() + QPointF(g->radius(), 0);
        newGradient->m_focalPoint = g->focalPoint();
        break;
    }
    case QGradient::ConicalGradient: {
        QConicalGradient * g = static_cast<QConicalGradient*>(gradient);
        qreal radian = g->angle() * M_PI / 180.0;
        newGradient->m_start = g->center();
        newGradient->m_stop = QPointF(100.0 * cos(radian), 100.0 * sin(radian));
        newGradient->m_focalPoint = g->center();
        break;
    }
    default:
        delete newGradient;
        return 0;
    }

    Q_FOREACH (const QGradientStop & stop, gradient->stops()) {
        KoColor color(newGradient->colorSpace());
        color.fromQColor(stop.second);
        newGradient->m_stops.append(KoGradientStop(stop.first, color));
    }

    return newGradient;
}

void BitmapImage::drawEllipse( QRectF rectangle, QPen pen, QBrush brush, QPainter::CompositionMode cm, bool antialiasing)
{
    int width = pen.width();
    extend( rectangle.adjusted(-width,-width,width,width).toRect() );
    if (brush.style() == Qt::RadialGradientPattern)
    {
        QRadialGradient* gradient = (QRadialGradient*)brush.gradient();
        gradient->setCenter( gradient->center() - topLeft() );
        gradient->setFocalPoint( gradient->focalPoint() - topLeft() );
    }
    if (mImage != NULL && !mImage->isNull() )
    {
        QPainter painter(mImage);
        painter.setCompositionMode(cm);
        painter.setRenderHint(QPainter::Antialiasing, antialiasing);
        painter.setPen(pen);
        painter.setBrush(brush);
        //if (brush == Qt::NoBrush)
        painter.drawEllipse( rectangle.translated(-topLeft()) );
        painter.end();
    }
}

void BitmapImage::drawRect(QRectF rectangle, QPen pen, QBrush brush, QPainter::CompositionMode cm, bool antialiasing)
{
    int width = pen.width();
    setCompositionModeBounds(rectangle.adjusted(-width, -width, width, width).toRect(), true, cm);
    if (brush.style() == Qt::RadialGradientPattern)
    {
        QRadialGradient* gradient = (QRadialGradient*)brush.gradient();
        gradient->setCenter(gradient->center() - mBounds.topLeft());
        gradient->setFocalPoint(gradient->focalPoint() - mBounds.topLeft());
    }
    if (!image()->isNull())
    {
        QPainter painter(image());
        painter.setCompositionMode(cm);
        painter.setRenderHint(QPainter::Antialiasing, antialiasing);
        painter.setPen(pen);
        painter.setBrush(brush);
        painter.drawRect(rectangle.translated(-mBounds.topLeft()));
        painter.end();
    }
    modification();
}

void Mask::mask_slot(){
    int countSel = gsri->countSelected();
    GObjectInterface *iObj, *endObj=gsri->selected(gsri->countSelected()-1);//создаём контейнер с выделенными рамкой объектами
    qreal k_h, k_w, width_iObj, width_endObj = endObj->boundingRect().width(),
    height_iObj, height_endObj = endObj->boundingRect().height();
    QBrush endObjBrush = endObj->brush();
    if(endObjBrush.style() == Qt::RadialGradientPattern
            || endObjBrush.style() == Qt::ConicalGradientPattern
                || endObjBrush.style() == Qt::LinearGradientPattern){
        for (int i=0; i<countSel-1; i++){
            iObj = gsri->selected(i);
            QBrush inters = iObj->brush();
            qreal iObjAlpha = inters.color().alphaF();
            QGradient qg = *endObjBrush.gradient();
            height_iObj = iObj->boundingRect().height();
            width_iObj = iObj->boundingRect().width();
            k_h = height_endObj/height_iObj;//считаем коэффициенты пропорциональности фигур для умножения-->
            k_w = width_endObj/width_iObj;//-->на точки градиента(чтобы градиенты не зависели от размеров фигур).

            int d_x = iObj->boundingRect().x() - endObj->boundingRect().x();//вычисляем расстояния между левыми краями фигур
            int d_y = iObj->boundingRect().y() - endObj->boundingRect().y();
            qreal k_shift_x = ( d_x / width_endObj) * k_w,//вычисляем коэффициенты сдвига градиента по ширине-->
                    k_shift_y = (d_y / height_endObj) * k_h;//--> и по высотке

            QGradientStops grStops(qg.stops());//копируем точки/цвета задаваемого градиента.

            QColor BrushColor = inters.gradient()->stops()[0].second;

            for(int j=0; j<grStops.count(); j++){
                grStops[j].second.setRgbF( BrushColor.redF(), BrushColor.greenF(), BrushColor.blueF(),
                                           grStops[j].second.alphaF()*iObjAlpha);
            }

            if(qg.type() == QGradient::LinearGradient){
                QLinearGradient qlg = *static_cast<const QLinearGradient *>(endObjBrush.gradient());
                QLinearGradient qlgLinear(qlg.start().x() * k_w - k_shift_x, qlg.start().y() * k_h - k_shift_y,
                                         qlg.finalStop().x() * k_w - k_shift_x, qlg.finalStop().y() * k_h - k_shift_y);
                qlgLinear.setStops(grStops);
                iObj->setBrush(qlgLinear);
            }

            if(qg.type() == QGradient::RadialGradient){
                for(int j=0; j<grStops.count(); j++)
                    grStops[j].first *= k_w;
                QRadialGradient qlg = *static_cast<const QRadialGradient *>(endObjBrush.gradient());
                QRadialGradient qlgRadial(QPointF(qlg.center().x()*k_w - k_shift_x, qlg.center().y()*k_h - k_shift_y),
                     qlg.radius(), QPointF(qlg.focalPoint().x()*k_w - k_shift_x, qlg.focalPoint().y()*k_h - k_shift_y),
                     qlg.focalRadius());
                qlgRadial.setStops(grStops);
                iObj->setBrush(qlgRadial);
            }

            if(qg.type() == QGradient::ConicalGradient){
                QConicalGradient qlg = *static_cast<const QConicalGradient *>(endObjBrush.gradient());
                QConicalGradient qlgConical(QPointF(qlg.center().x()*k_w - k_shift_x, qlg.center().y()*k_h - k_shift_y),
                                          qlg.angle());
                qlgConical.setStops(grStops);
                iObj->setBrush(qlgConical);
            }
        }
        endObj->setVisible(false);
    }
    else{
        QMessageBox m;
        m.setText(tr("upper figure does not contain a gradient"));
        m.exec();
    }
    gsri->reset();

}