Qt 4.8: QGraphicsRectItem Class Reference

Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# QGraphicsRectItem Class Reference

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

     #include <QGraphicsRectItem>

Inherits: QAbstractGraphicsShapeItem.

This class was introduced in Qt 4.2.

- List of all members, including inherited members

## Public Functions

| QGraphicsRectItem ( QGraphicsItem * parent = 0 )
| QGraphicsRectItem ( const QRectF & rect, QGraphicsItem * parent = 0 )
| QGraphicsRectItem ( qreal x, qreal y, qreal width, qreal height, QGraphicsItem * parent = 0 )
| ~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
virtual bool | contains ( const QPointF & point ) const
virtual bool | isObscuredBy ( const QGraphicsItem * item ) const
virtual QPainterPath | opaqueArea () const
virtual void | paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 )
virtual QPainterPath | shape () const
virtual int | type () const

- 6 public functions inherited from QAbstractGraphicsShapeItem
- 177 public functions inherited from QGraphicsItem

### Additional Inherited Members

- 2 static public members inherited from QGraphicsItem
- 24 protected functions inherited from QGraphicsItem

## Detailed Description

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

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 Function Documentation

### QGraphicsRectItem::QGraphicsRectItem ( QGraphicsItem * parent = 0 )

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

See also QGraphicsScene::addItem().

### QGraphicsRectItem::QGraphicsRectItem ( const QRectF & rect, QGraphicsItem * parent = 0 )

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

See also QGraphicsScene::addItem().

### QGraphicsRectItem::QGraphicsRectItem ( qreal x, qreal y, qreal width, qreal height, QGraphicsItem * parent = 0 )

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 ()

Destroys the QGraphicsRectItem.

### QRectF QGraphicsRectItem::boundingRect () const`[virtual]`

Reimplemented from QGraphicsItem::boundingRect().

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

Reimplemented from QGraphicsItem::contains().

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

Reimplemented from QGraphicsItem::isObscuredBy().

### QPainterPath QGraphicsRectItem::opaqueArea () const`[virtual]`

Reimplemented from QGraphicsItem::opaqueArea().

### void QGraphicsRectItem::paint ( QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0 )`[virtual]`

Reimplemented from QGraphicsItem::paint().

### 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().

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

Reimplemented from QGraphicsItem::shape().

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

Reimplemented from QGraphicsItem::type().