QGraphicsLineItem Class
The QGraphicsLineItem class provides a line item that you can add to a QGraphicsScene. 更多...
| 头文件: | #include <QGraphicsLineItem> |
| qmake: | QT += widgets |
| 开始支持版本: | Qt 4.2 |
| 基类: | QGraphicsItem |
公有函数
| QGraphicsLineItem(QGraphicsItem *parent = Q_NULLPTR) | |
| QGraphicsLineItem(const QLineF &line, QGraphicsItem *parent = Q_NULLPTR) | |
| QGraphicsLineItem(qreal x1, qreal y1, qreal x2, qreal y2, QGraphicsItem *parent = Q_NULLPTR) | |
| ~QGraphicsLineItem() | |
| QLineF | line() const |
| QPen | pen() const |
| void | setLine(const QLineF &line) |
| void | setLine(qreal x1, qreal y1, qreal x2, qreal y2) |
| void | setPen(const QPen &pen) |
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 |
- 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 QGraphicsLineItem class provides a line item that you can add to a QGraphicsScene.
To set the item's line, pass a QLineF to QGraphicsLineItem's constructor, or call the setLine() function. The line() function returns the current line. By default the line is black with a width of 0, but you can change this by calling setPen().
QGraphicsLineItem uses the line and the pen width to provide a reasonable implementation of boundingRect(), shape(), and contains(). The paint() function draws the line using the item's associated pen.
参见 QGraphicsPathItem, QGraphicsRectItem, QGraphicsEllipseItem, QGraphicsTextItem, QGraphicsPolygonItem, QGraphicsPixmapItem, and Graphics View Framework.
成员函数
QGraphicsLineItem::QGraphicsLineItem(QGraphicsItem *parent = Q_NULLPTR)
Constructs a QGraphicsLineItem. parent is passed to QGraphicsItem's constructor.
参见 QGraphicsScene::addItem().
QGraphicsLineItem::QGraphicsLineItem(const QLineF &line, QGraphicsItem *parent = Q_NULLPTR)
Constructs a QGraphicsLineItem, using line as the default line. parent is passed to QGraphicsItem's constructor.
参见 QGraphicsScene::addItem().
QGraphicsLineItem::QGraphicsLineItem(qreal x1, qreal y1, qreal x2, qreal y2, QGraphicsItem *parent = Q_NULLPTR)
Constructs a QGraphicsLineItem, using the line between (x1, y1) and (x2, y2) as the default line. parent is passed to QGraphicsItem's constructor.
参见 QGraphicsScene::addItem().
QGraphicsLineItem::~QGraphicsLineItem()
Destroys the QGraphicsLineItem.
[virtual] QRectF QGraphicsLineItem::boundingRect() const
重新实现 QGraphicsItem::boundingRect().
[virtual] bool QGraphicsLineItem::contains(const QPointF &point) const
重新实现 QGraphicsItem::contains().
[virtual] bool QGraphicsLineItem::isObscuredBy(const QGraphicsItem *item) const
重新实现 QGraphicsItem::isObscuredBy().
QLineF QGraphicsLineItem::line() const
Returns the item's line, or a null line if no line has been set.
参见 setLine().
[virtual] QPainterPath QGraphicsLineItem::opaqueArea() const
重新实现 QGraphicsItem::opaqueArea().
[virtual] void QGraphicsLineItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = Q_NULLPTR)
重新实现 QGraphicsItem::paint().
QPen QGraphicsLineItem::pen() const
Returns the item's pen, or a black solid 0-width pen if no pen has been set.
参见 setPen().
void QGraphicsLineItem::setLine(const QLineF &line)
Sets the item's line to be the given line.
参见 line().
void QGraphicsLineItem::setLine(qreal x1, qreal y1, qreal x2, qreal y2)
This is an overloaded function.
Sets the item's line to be the line between (x1, y1) and (x2, y2).
This is the same as calling setLine(QLineF(x1, y1, x2, y2)).
void QGraphicsLineItem::setPen(const QPen &pen)
Sets the item's pen to pen. If no pen is set, the line will be painted using a black solid 0-width pen.
参见 pen().
[virtual] QPainterPath QGraphicsLineItem::shape() const
重新实现 QGraphicsItem::shape().
[virtual] int QGraphicsLineItem::type() const
重新实现 QGraphicsItem::type().