QGraphicsRectItem Class
The QGraphicsRectItem class provides a rectangle item that you can add to a QGraphicsScene. 更多...
| 头文件: | #include <QGraphicsRectItem> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QAbstractGraphicsShapeItem |
公有函数
| 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) |
重新实现的公有函数
| 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 |
- 6 个公有函数继承自 QAbstractGraphicsShapeItem
- 176 个公有函数继承自 QGraphicsItem
其他继承的成员
- 2 个静态公有成员继承自 QGraphicsItem
- 24 个受保护的函数继承自 QGraphicsItem
详细描述
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.
参见 QGraphicsPathItem, QGraphicsEllipseItem, QGraphicsPolygonItem, QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, and Graphics View Framework.
成员函数
QGraphicsRectItem::QGraphicsRectItem(QGraphicsItem *parent = Q_NULLPTR)
Constructs a QGraphicsRectItem. parent is passed to QAbstractGraphicsShapeItem's constructor.
参见 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.
参见 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.
参见 QGraphicsScene::addItem().
QGraphicsRectItem::~QGraphicsRectItem()
Destroys the QGraphicsRectItem.
[virtual] QRectF QGraphicsRectItem::boundingRect() const
重新实现 QGraphicsItem::boundingRect().
[virtual] bool QGraphicsRectItem::contains(const QPointF &point) const
重新实现 QGraphicsItem::contains().
[virtual] bool QGraphicsRectItem::isObscuredBy(const QGraphicsItem *item) const
重新实现 QGraphicsItem::isObscuredBy().
[virtual] QPainterPath QGraphicsRectItem::opaqueArea() const
重新实现 QGraphicsItem::opaqueArea().
[virtual] void QGraphicsRectItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = Q_NULLPTR)
重新实现 QGraphicsItem::paint().
QRectF QGraphicsRectItem::rect() const
Returns the item's rectangle.
参见 setRect().
void QGraphicsRectItem::setRect(const QRectF &rectangle)
Sets the item's rectangle to be the given rectangle.
参见 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))
参见 rect().
[virtual] QPainterPath QGraphicsRectItem::shape() const
重新实现 QGraphicsItem::shape().
[virtual] int QGraphicsRectItem::type() const
重新实现 QGraphicsItem::type().