Qt画圆角矩形

Qt画圆角矩形

void TestPainter::paintEvent(QPaintEvent *event)
{
	QPainter painter(this);

	const qreal radius = 20;
	QRectF rect = QRect(200, 200, 400, 80);

	QPainterPath path;

	path.moveTo(rect.bottomRight() - QPointF(0, radius));
	path.lineTo(rect.topRight() + QPointF(0, radius));
	path.arcTo(QRectF(QPointF(rect.topRight() - QPointF(radius * 2, 0)), QSize(radius * 2, radius *2)), 0, 90);
	path.lineTo(rect.topLeft() + QPointF(radius, 0));
	path.arcTo(QRectF(QPointF(rect.topLeft()), QSize(radius * 2, radius * 2)), 90, 90);
	path.lineTo(rect.bottomLeft() - QPointF(0, radius));
	path.arcTo(QRectF(QPointF(rect.bottomLeft() - QPointF(0, radius * 2)), QSize(radius * 2, radius * 2)), 180, 90);
	path.lineTo(rect.bottomLeft() + QPointF(radius, 0));
	path.arcTo(QRectF(QPointF(rect.bottomRight() - QPointF(radius * 2, radius * 2)), QSize(radius * 2, radius * 2)), 270, 90);

	painter.fillPath(path, QColor(Qt::gray));
	//painter.drawPath(path);

	QWidget::paintEvent(event);
}