QGraphicsRectItem Class

The QGraphicsRectItem class provides a rectangle item that you can add to a QGraphicsScene. More...

Header: #include <QGraphicsRectItem>
CMake: find_package(Qt6 COMPONENTS Widgets REQUIRED)
target_link_libraries(mytarget PRIVATE Qt6::Widgets)
qmake: QT += widgets
Inherits: QAbstractGraphicsShapeItem

Public Types

enum anonymous { Type }

Public Functions

QGraphicsRectItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = nullptr)
QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent = nullptr)
QGraphicsRectItem(QGraphicsItem *parent = nullptr)
virtual ~QGraphicsRectItem()
QRectF rect() const
void setRect(const QRectF &rectangle)
void setRect(qreal x, qreal y, qreal width, qreal height)

Reimplemented Public Functions

virtual QRectF boundingRect() const override
virtual bool contains(const QPointF &point) const override
virtual bool isObscuredBy(const QGraphicsItem *item) const override
virtual QPainterPath opaqueArea() const override
virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override
virtual QPainterPath shape() const override
virtual int type() const override

Detailed Description

To set the item's rectangle, pass a QRectF to QGraphicsRectItem's constructor, or call the setRect() function. The rect() function returns the current rectangle.

QGraphicsRectItem uses the rectangle and the pen width to provide a reasonable implementation of boundingRect(), shape(), and contains(). The paint() function draws the rectangle using the item's associated pen and brush, which you can set by calling the setPen() and setBrush() functions.

Note: The rendering of invalid rectangles, such as those with negative widths or heights, is undefined. If you cannot be sure that you are using valid rectangles (for example, if you are creating rectangles using data from an unreliable source) then you should use QRectF::normalized() to create normalized rectangles, and use those instead.

See also QGraphicsPathItem, QGraphicsEllipseItem, QGraphicsPolygonItem, QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, and Graphics View Framework.

Member Type Documentation

enum QGraphicsRectItem::anonymous

The value returned by the virtual type() function.

QGraphicsRectItem::Type3A graphics rect item

Member Function Documentation

void QGraphicsRectItem::setRect(qreal x, qreal y, qreal width, qreal height)

Sets the item's rectangle to the rectangle defined by (x, y) and the given width and height.

This convenience function is equivalent to calling setRect(QRectF(x, y, width, height))

See also rect().

QGraphicsRectItem::QGraphicsRectItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = nullptr)

Constructs a QGraphicsRectItem with a default rectangle defined by (x, y) and the given width and height.

parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

QGraphicsRectItem::QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent = nullptr)

Constructs a QGraphicsRectItem, using rect as the default rectangle. parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

QGraphicsRectItem::QGraphicsRectItem(QGraphicsItem *parent = nullptr)

Constructs a QGraphicsRectItem. parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

[virtual] QGraphicsRectItem::~QGraphicsRectItem()

Destroys the QGraphicsRectItem.

[override virtual] QRectF QGraphicsRectItem::boundingRect() const

Reimplements: QGraphicsItem::boundingRect() const.

[override virtual] bool QGraphicsRectItem::contains(const QPointF &point) const

Reimplements: QGraphicsItem::contains(const QPointF &point) const.

[override virtual] bool QGraphicsRectItem::isObscuredBy(const QGraphicsItem *item) const

Reimplements: QAbstractGraphicsShapeItem::isObscuredBy(const QGraphicsItem *item) const.

[override virtual] QPainterPath QGraphicsRectItem::opaqueArea() const

Reimplements: QAbstractGraphicsShapeItem::opaqueArea() const.

[override virtual] void QGraphicsRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr)

Reimplements: QGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget).

QRectF QGraphicsRectItem::rect() const

Returns the item's rectangle.

See also setRect().

void QGraphicsRectItem::setRect(const QRectF &rectangle)

Sets the item's rectangle to be the given rectangle.

See also rect().

[override virtual] QPainterPath QGraphicsRectItem::shape() const

Reimplements: QGraphicsItem::shape() const.

[override virtual] int QGraphicsRectItem::type() const

Reimplements: QGraphicsItem::type() const.

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