- Qt 6.11
- Qt Widgets
- C++ Classes
- QGraphicsRectItem
- Qt 6.11.0 Reference Documentation

# QGraphicsRectItem Class

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

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

- List of all members, including inherited members

## Public Types

| enum { Type }

## Public Functions

| QGraphicsRectItem(QGraphicsItem *parent = nullptr)
| QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent = nullptr)
| QGraphicsRectItem(qreal x, qreal y, qreal width, qreal height, 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

## Reimplemented Protected Functions

virtual QVariant | extension(const QVariant &variant) const override
virtual void | setExtension(QGraphicsItem::Extension extension, const QVariant &variant) override
virtual bool | supportsExtension(QGraphicsItem::Extension extension) 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

### `[anonymous]` enum

The value returned by the virtual type() function.

Constant | Value | Description
--- | --- | ---
`QGraphicsRectItem::Type` | `3` | A graphics rect item

## Member Function Documentation

### `[explicit]` QGraphicsRectItem::QGraphicsRectItem(QGraphicsItem *parent = nullptr)

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

See also QGraphicsScene::addItem().

### `[explicit]` 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().

### `[explicit]` 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().

### `[virtual noexcept]` 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().

### 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().

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

Reimplements: QGraphicsItem::shape() const.

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

Reimplements: QGraphicsItem::type() const.