自学教程：C++ textRect函数代码示例

voidHTGAvatarView::_UpdateCounter(){	char counterString[32];	int symbolsLeft =  NUMBER_OF_ALLOWED_CHARS;  		/*Calculate the number of characters left*/	int utf8length = 0;	uchar c;	for(int i=0; (c=fMessage->ByteAt(i))!='/0'; i++) {		if ((c&0x80) == 0) {			// UTF-8 single byte char			utf8length++;		} else if ((c&0xc0) != 0x80) {			// first byte of UTF-8 multi byte character			utf8length++;		}	}	symbolsLeft -= utf8length;	sprintf(counterString, "%i", symbolsLeft);		/*Check symbolsLeft, disable/enable post button and change counter color.*/	if(symbolsLeft < 0) {		fCounterView->SetHighColor(255, 0, 0);		fPostButton->SetEnabled(false);	}	else if(symbolsLeft < 140) {		fCounterView->SetHighColor(128, 128, 128);		fPostButton->SetEnabled(true);				if(displayAvatar) {			displayAvatar = false;			Invalidate();			AddChild(fPostButton);			AddChild(fCounterView);			ResizeTo(Bounds().Width(), 83);			BPoint buttonPoint(Frame().right-55, Frame().top+1+kMargin);			BPoint counterPoint(Frame().right-40, Frame().top+1+kMargin+fPostButton->Bounds().Height());			fPostButton->MoveTo(buttonPoint);			fCounterView->MoveTo(counterPoint);			((HTGMainWindow *)Window())->AvatarViewResized();			BRect textRect(5,22,Bounds().right-60,65);			fMessage->ResizeTo(textRect.Width(), textRect.Height());		}	}	else if(symbolsLeft >= 140) {		fPostButton->SetEnabled(false);		ResizeTo(Bounds().Width(), 52);		((HTGMainWindow *)Window())->AvatarViewResized();		BRect textRect(5,22,Bounds().right-60,45);		displayAvatar = true;		Invalidate();		fPostButton->RemoveSelf();		fCounterView->RemoveSelf();		fMessage->ResizeTo(textRect.Width(), textRect.Height());	}	fCounterView->SetText(counterString);}

void GraphicsAngleItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget){    Q_UNUSED(widget);    qreal lod = option->levelOfDetailFromTransform(painter->worldTransform());    if (lod > lodThreshold_) {        painter->save();        painter->fillRect(boundingRect(), color_);        if (lod > textLodThreshold_) {            painter->setPen(QPen(QColor(Qt::gray), 0));            painter->drawRect(boundingRect());            painter->setPen(QPen(QColor(Qt::black)));            int precision = std::min(static_cast<int>(lod / 8.0), 5);            QString text = QString::number(value_, 'g', precision);            QFont font("Times");            font.setStyleStrategy(QFont::ForceOutline);            painter->setFont(font);            qreal scaleCoeff = 1.0 / lod;            painter->scale(scaleCoeff, scaleCoeff);            QRectF textRect(0, 0, width_ / scaleCoeff, height_ / scaleCoeff);            painter->drawText(textRect, Qt::AlignCenter, text);        }        painter->restore();    }}

void BarChartWidget::drawBars(QPainter &painter) {    std::vector<int> sizes(BAR_COUNT, 0);    fillSizes(sizes);    QRect baseRectangle = rect();    int activeWidth = (int) std::floor( baseRectangle.width() * (1 - 2 * PADDING) );    int singleBarWidth = (int) std::floor((activeWidth - (BAR_COUNT + 1) * SPACING) / BAR_COUNT);    int baseLineY = (int) std::floor(baseRectangle.bottom() - PADDING_BOTTOM);    int currX = (int) std::floor(baseRectangle.left() + baseRectangle.width() * PADDING);    currX += SPACING;    for (int i = 0; i < BAR_COUNT; i++) {        QPoint pointTopLeft(currX, baseLineY - sizes.at((unsigned long) i));        QPoint pointBottomRight(currX + singleBarWidth, baseLineY - 1);        QRect bar(pointTopLeft, pointBottomRight);        painter.setPen(mainColor);        painter.drawRect(bar);        painter.fillRect(bar, barColor);        QPoint textTopLeft(currX, baseLineY);        QPoint textBottomRight(currX + singleBarWidth, baseRectangle.bottom());        QRect textRect(textTopLeft, textBottomRight);        painter.setPen(mainColor);        painter.drawText(textRect, Qt::AlignCenter, labels->at((unsigned long) i));                QPoint valueTopLeft(currX, baseLineY - sizes.at((unsigned long) i) - VALUE_LABEL_HEIGHT);        QPoint valueBottomRight(currX + singleBarWidth, baseLineY);        QRect valueLabelRect(valueTopLeft, valueBottomRight);        QString textValue = QString::number(values->at((unsigned long) i));        painter.drawText(valueLabelRect, Qt::AlignHCenter | Qt::AlignTop, textValue);                currX += singleBarWidth + SPACING;    }}

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