QGraphicsRectItem Class

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

Header: #include <QGraphicsRectItem>
qmake: QT += widgets
Since: Qt 4.2
Inherits: QAbstractGraphicsShapeItem

Public Functions

QGraphicsRectItem(QGraphicsItem *parent = Q_NULLPTR)
QGraphicsRectItem(const QRectF &rect, QGraphicsItem *parent = Q_NULLPTR)
QGraphicsRectItem(qreal x, qreal y, qreal width, qreal height, QGraphicsItem *parent = Q_NULLPTR)
~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 = Q_NULLPTR)
virtual QPainterPath shape() const
virtual int type() const

Additional Inherited Members

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 = Q_NULLPTR)

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

See also QGraphicsScene::addItem().

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

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 = Q_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()

Destroys the QGraphicsRectItem.

[virtual] QRectF QGraphicsRectItem::boundingRect() const

Reimplemented from QGraphicsItem::boundingRect().

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

Reimplemented from QGraphicsItem::contains().

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

Reimplemented from QGraphicsItem::isObscuredBy().

[virtual] QPainterPath QGraphicsRectItem::opaqueArea() const

Reimplemented from QGraphicsItem::opaqueArea().

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

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().

[virtual] QPainterPath QGraphicsRectItem::shape() const

Reimplemented from QGraphicsItem::shape().

[virtual] int QGraphicsRectItem::type() const

Reimplemented from QGraphicsItem::type().

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