QGraphicsPolygonItem Class
The QGraphicsPolygonItem class provides a polygon item that you can add to a QGraphicsScene. More...
| Header: | #include <QGraphicsPolygonItem> |
| qmake: | QT += widgets |
| Since: | Qt 4.2 |
| Inherits: | QAbstractGraphicsShapeItem |
Public Types
| enum | anonymous { Type } |
Public Functions
| QGraphicsPolygonItem(QGraphicsItem *parent = nullptr) | |
| QGraphicsPolygonItem(const QPolygonF &polygon, QGraphicsItem *parent = nullptr) | |
| virtual | ~QGraphicsPolygonItem() |
| Qt::FillRule | fillRule() const |
| QPolygonF | polygon() const |
| void | setFillRule(Qt::FillRule rule) |
| void | setPolygon(const QPolygonF &polygon) |
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 |
- 6 public functions inherited from QAbstractGraphicsShapeItem
- 176 public functions inherited from QGraphicsItem
Additional Inherited Members
- 24 protected functions inherited from QGraphicsItem
Detailed Description
The QGraphicsPolygonItem class provides a polygon item that you can add to a QGraphicsScene.
To set the item's polygon, pass a QPolygonF to QGraphicsPolygonItem's constructor, or call the setPolygon() function. The polygon() function returns the current polygon.
QGraphicsPolygonItem uses the polygon and the pen width to provide a reasonable implementation of boundingRect(), shape(), and contains(). The paint() function draws the polygon using the item's associated pen and brush, which you can set by calling the setPen() and setBrush() functions.
See also QGraphicsPathItem, QGraphicsRectItem, QGraphicsEllipseItem, QGraphicsTextItem, QGraphicsLineItem, QGraphicsPixmapItem, and Graphics View Framework.
Member Type Documentation
enum QGraphicsPolygonItem::anonymous
The value returned by the virtual type() function.
| Constant | Value | Description |
|---|---|---|
QGraphicsPolygonItem::Type | 5 | A graphics polygon item |
Member Function Documentation
QGraphicsPolygonItem::QGraphicsPolygonItem(QGraphicsItem *parent = nullptr)
Constructs a QGraphicsPolygonItem. parent is passed to QAbstractGraphicsShapeItem's constructor.
See also QGraphicsScene::addItem().
QGraphicsPolygonItem::QGraphicsPolygonItem(const QPolygonF &polygon, QGraphicsItem *parent = nullptr)
Constructs a QGraphicsPolygonItem with polygon as the default polygon. parent is passed to QAbstractGraphicsShapeItem's constructor.
See also QGraphicsScene::addItem().
[virtual] QGraphicsPolygonItem::~QGraphicsPolygonItem()
Destroys the QGraphicsPolygonItem.
[override virtual] QRectF QGraphicsPolygonItem::boundingRect() const
Reimplemented from QGraphicsItem::boundingRect().
[override virtual] bool QGraphicsPolygonItem::contains(const QPointF &point) const
Reimplemented from QGraphicsItem::contains().
Qt::FillRule QGraphicsPolygonItem::fillRule() const
Returns the fill rule of the polygon. The default fill rule is Qt::OddEvenFill.
See also setFillRule(), QPainterPath::fillRule(), and QPainter::drawPolygon().
[override virtual] bool QGraphicsPolygonItem::isObscuredBy(const QGraphicsItem *item) const
Reimplemented from QAbstractGraphicsShapeItem::isObscuredBy().
[override virtual] QPainterPath QGraphicsPolygonItem::opaqueArea() const
Reimplemented from QAbstractGraphicsShapeItem::opaqueArea().
[override virtual] void QGraphicsPolygonItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr)
Reimplemented from QGraphicsItem::paint().
QPolygonF QGraphicsPolygonItem::polygon() const
Returns the item's polygon, or an empty polygon if no polygon has been set.
See also setPolygon().
void QGraphicsPolygonItem::setFillRule(Qt::FillRule rule)
Sets the fill rule of the polygon to rule. The default fill rule is Qt::OddEvenFill.
See also fillRule(), QPainterPath::fillRule(), and QPainter::drawPolygon().
void QGraphicsPolygonItem::setPolygon(const QPolygonF &polygon)
Sets the item's polygon to be the given polygon.
See also polygon().
[override virtual] QPainterPath QGraphicsPolygonItem::shape() const
Reimplemented from QGraphicsItem::shape().
[override virtual] int QGraphicsPolygonItem::type() const
Reimplemented from QGraphicsItem::type().
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