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QGraphicsPolygonItem Class

The QGraphicsPolygonItem class provides a polygon item that you can add to a QGraphicsScene. More...

 #include <QGraphicsPolygonItem>

Inherits: QAbstractGraphicsShapeItem.

This class was introduced in Qt 4.2.

Public Types

enum CacheMode { NoCache, ItemCoordinateCache, DeviceCoordinateCache }
enum GraphicsItemChange { ItemEnabledChange, ItemEnabledHasChanged, ItemMatrixChange, ItemPositionChange, ..., ItemScenePositionHasChanged }
enum GraphicsItemFlag { ItemIsMovable, ItemIsSelectable, ItemIsFocusable, ItemClipsToShape, ..., ItemSendsScenePositionChanges }
flags GraphicsItemFlags
enum PanelModality { NonModal, PanelModal, SceneModal }

Public Functions

QGraphicsItem(QGraphicsItem * parent = 0)
QGraphicsPolygonItem(QGraphicsItem * parent = 0)
QGraphicsPolygonItem(const QPolygonF & polygon, QGraphicsItem * parent = 0)
virtual ~QGraphicsItem()
~QGraphicsPolygonItem()
bool acceptDrops() const
bool acceptHoverEvents() const
bool acceptTouchEvents() const
Qt::MouseButtons acceptedMouseButtons() const
virtual void advance(int phase)
virtual QRectF boundingRect() const = 0
QRegion boundingRegion(const QTransform & itemToDeviceTransform) const
qreal boundingRegionGranularity() const
CacheMode cacheMode() const
QList<QGraphicsItem *> childItems() const
QRectF childrenBoundingRect() const
void clearFocus()
QPainterPath clipPath() const
virtual bool collidesWithItem(const QGraphicsItem * other, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const
virtual bool collidesWithPath(const QPainterPath & path, Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const
QList<QGraphicsItem *> collidingItems(Qt::ItemSelectionMode mode = Qt::IntersectsItemShape) const
QGraphicsItem * commonAncestorItem(const QGraphicsItem * other) const
virtual bool contains(const QPointF & point) const
QCursor cursor() const
QVariant data(int key) const
QTransform deviceTransform(const QTransform & viewportTransform) const
qreal effectiveOpacity() const
void ensureVisible(const QRectF & rect = QRectF(), int xmargin = 50, int ymargin = 50)
void ensureVisible(qreal x, qreal y, qreal w, qreal h, int xmargin = 50, int ymargin = 50)
Qt::FillRule fillRule() const
bool filtersChildEvents() const
GraphicsItemFlags flags() const
QGraphicsItem * focusItem() const
QGraphicsItem * focusProxy() const
void grabKeyboard()
void grabMouse()
QGraphicsEffect * graphicsEffect() const
QGraphicsItemGroup * group() const
bool hasCursor() const
bool hasFocus() const
void hide()
Qt::InputMethodHints inputMethodHints() const
void installSceneEventFilter(QGraphicsItem * filterItem)
bool isActive() const
bool isAncestorOf(const QGraphicsItem * child) const
bool isBlockedByModalPanel(QGraphicsItem ** blockingPanel = 0) const
bool isClipped() const
bool isEnabled() const
bool isObscured() const
bool isObscured(qreal x, qreal y, qreal w, qreal h) const
bool isObscured(const QRectF & rect) const
virtual bool isObscuredBy(const QGraphicsItem * item) const
bool isPanel() const
bool isSelected() const
bool isUnderMouse() const
bool isVisible() const
bool isVisibleTo(const QGraphicsItem * parent) const
bool isWidget() const
bool isWindow() const
QTransform itemTransform(const QGraphicsItem * other, bool * ok = 0) const
QPointF mapFromItem(const QGraphicsItem * item, const QPointF & point) const
QPolygonF mapFromItem(const QGraphicsItem * item, const QRectF & rect) const
QPolygonF mapFromItem(const QGraphicsItem * item, const QPolygonF & polygon) const
QPainterPath mapFromItem(const QGraphicsItem * item, const QPainterPath & path) const
QPolygonF mapFromItem(const QGraphicsItem * item, qreal x, qreal y, qreal w, qreal h) const
QPointF mapFromItem(const QGraphicsItem * item, qreal x, qreal y) const
QPointF mapFromParent(const QPointF & point) const
QPolygonF mapFromParent(const QRectF & rect) const
QPolygonF mapFromParent(const QPolygonF & polygon) const
QPainterPath mapFromParent(const QPainterPath & path) const
QPolygonF mapFromParent(qreal x, qreal y, qreal w, qreal h) const
QPointF mapFromParent(qreal x, qreal y) const
QPointF mapFromScene(const QPointF & point) const
QPolygonF mapFromScene(const QRectF & rect) const
QPolygonF mapFromScene(const QPolygonF & polygon) const
QPainterPath mapFromScene(const QPainterPath & path) const
QPolygonF mapFromScene(qreal x, qreal y, qreal w, qreal h) const
QPointF mapFromScene(qreal x, qreal y) const
QRectF mapRectFromItem(const QGraphicsItem * item, const QRectF & rect) const
QRectF mapRectFromItem(const QGraphicsItem * item, qreal x, qreal y, qreal w, qreal h) const
QRectF mapRectFromParent(const QRectF & rect) const
QRectF mapRectFromParent(qreal x, qreal y, qreal w, qreal h) const
QRectF mapRectFromScene(const QRectF & rect) const
QRectF mapRectFromScene(qreal x, qreal y, qreal w, qreal h) const
QRectF mapRectToItem(const QGraphicsItem * item, const QRectF & rect) const
QRectF mapRectToItem(const QGraphicsItem * item, qreal x, qreal y, qreal w, qreal h) const
QRectF mapRectToParent(const QRectF & rect) const
QRectF mapRectToParent(qreal x, qreal y, qreal w, qreal h) const
QRectF mapRectToScene(const QRectF & rect) const
QRectF mapRectToScene(qreal x, qreal y, qreal w, qreal h) const
QPointF mapToItem(const QGraphicsItem * item, const QPointF & point) const
QPolygonF mapToItem(const QGraphicsItem * item, const QRectF & rect) const
QPolygonF mapToItem(const QGraphicsItem * item, const QPolygonF & polygon) const
QPainterPath mapToItem(const QGraphicsItem * item, const QPainterPath & path) const
QPolygonF mapToItem(const QGraphicsItem * item, qreal x, qreal y, qreal w, qreal h) const
QPointF mapToItem(const QGraphicsItem * item, qreal x, qreal y) const
QPointF mapToParent(const QPointF & point) const
QPolygonF mapToParent(const QRectF & rect) const
QPolygonF mapToParent(const QPolygonF & polygon) const
QPainterPath mapToParent(const QPainterPath & path) const
QPolygonF mapToParent(qreal x, qreal y, qreal w, qreal h) const
QPointF mapToParent(qreal x, qreal y) const
QPointF mapToScene(const QPointF & point) const
QPolygonF mapToScene(const QRectF & rect) const
QPolygonF mapToScene(const QPolygonF & polygon) const
QPainterPath mapToScene(const QPainterPath & path) const
QPolygonF mapToScene(qreal x, qreal y, qreal w, qreal h) const
QPointF mapToScene(qreal x, qreal y) const
void moveBy(qreal dx, qreal dy)
qreal opacity() const
virtual QPainterPath opaqueArea() const
virtual void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0) = 0
QGraphicsItem * panel() const
PanelModality panelModality() const
QGraphicsItem * parentItem() const
QGraphicsObject * parentObject() const
QGraphicsWidget * parentWidget() const
QPolygonF polygon() const
QPointF pos() const
void removeSceneEventFilter(QGraphicsItem * filterItem)
void resetTransform()
qreal rotation() const
qreal scale() const
QGraphicsScene * scene() const
QRectF sceneBoundingRect() const
QPointF scenePos() const
QTransform sceneTransform() const
void scroll(qreal dx, qreal dy, const QRectF & rect = QRectF())
void setAcceptDrops(bool on)
void setAcceptHoverEvents(bool enabled)
void setAcceptTouchEvents(bool enabled)
void setAcceptedMouseButtons(Qt::MouseButtons buttons)
void setActive(bool active)
void setBoundingRegionGranularity(qreal granularity)
void setCacheMode(CacheMode mode, const QSize & logicalCacheSize = QSize())
void setCursor(const QCursor & cursor)
void setData(int key, const QVariant & value)
void setEnabled(bool enabled)
void setFillRule(Qt::FillRule rule)
void setFiltersChildEvents(bool enabled)
void setFlag(GraphicsItemFlag flag, bool enabled = true)
void setFlags(GraphicsItemFlags flags)
void setFocus(Qt::FocusReason focusReason = Qt::OtherFocusReason)
void setFocusProxy(QGraphicsItem * item)
void setGraphicsEffect(QGraphicsEffect * effect)
void setGroup(QGraphicsItemGroup * group)
void setInputMethodHints(Qt::InputMethodHints hints)
void setOpacity(qreal opacity)
void setPanelModality(PanelModality panelModality)
void setParentItem(QGraphicsItem * newParent)
void setPolygon(const QPolygonF & polygon)
void setPos(const QPointF & pos)
void setPos(qreal x, qreal y)
void setRotation(qreal angle)
void setScale(qreal factor)
void setSelected(bool selected)
void setToolTip(const QString & toolTip)
void setTransform(const QTransform & matrix, bool combine = false)
void setTransformOriginPoint(const QPointF & origin)
void setTransformOriginPoint(qreal x, qreal y)
void setTransformations(const QList<QGraphicsTransform *> & transformations)
void setVisible(bool visible)
void setX(qreal x)
void setY(qreal y)
void setZValue(qreal z)
virtual QPainterPath shape() const
void show()
void stackBefore(const QGraphicsItem * sibling)
QGraphicsObject * toGraphicsObject()
const QGraphicsObject * toGraphicsObject() const
QString toolTip() const
QGraphicsItem * topLevelItem() const
QGraphicsWidget * topLevelWidget() const
QTransform transform() const
QPointF transformOriginPoint() const
QList<QGraphicsTransform *> transformations() const
virtual int type() const
void ungrabKeyboard()
void ungrabMouse()
void unsetCursor()
void update(const QRectF & rect = QRectF())
void update(qreal x, qreal y, qreal width, qreal height)
QGraphicsWidget * window() const
qreal x() const
qreal y() const
qreal zValue() const

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

Static Public Members

const int Type
const int UserType

Protected Functions

virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent * event)
virtual void dragEnterEvent(QGraphicsSceneDragDropEvent * event)
virtual void dragLeaveEvent(QGraphicsSceneDragDropEvent * event)
virtual void dragMoveEvent(QGraphicsSceneDragDropEvent * event)
virtual void dropEvent(QGraphicsSceneDragDropEvent * event)
virtual void focusInEvent(QFocusEvent * event)
virtual void focusOutEvent(QFocusEvent * event)
virtual void hoverEnterEvent(QGraphicsSceneHoverEvent * event)
virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent * event)
virtual void hoverMoveEvent(QGraphicsSceneHoverEvent * event)
virtual void inputMethodEvent(QInputMethodEvent * event)
virtual QVariant inputMethodQuery(Qt::InputMethodQuery query) const
virtual QVariant itemChange(GraphicsItemChange change, const QVariant & value)
virtual void keyPressEvent(QKeyEvent * event)
virtual void keyReleaseEvent(QKeyEvent * event)
virtual void mouseDoubleClickEvent(QGraphicsSceneMouseEvent * event)
virtual void mouseMoveEvent(QGraphicsSceneMouseEvent * event)
virtual void mousePressEvent(QGraphicsSceneMouseEvent * event)
virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent * event)
void prepareGeometryChange()
virtual bool sceneEvent(QEvent * event)
virtual bool sceneEventFilter(QGraphicsItem * watched, QEvent * event)
void updateMicroFocus()
virtual void wheelEvent(QGraphicsSceneWheelEvent * event)

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 Function Documentation

QGraphicsPolygonItem::QGraphicsPolygonItem(QGraphicsItem * parent = 0)

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

See also QGraphicsScene::addItem().

QGraphicsPolygonItem::QGraphicsPolygonItem(const QPolygonF & polygon, QGraphicsItem * parent = 0)

Constructs a QGraphicsPolygonItem with polygon as the default polygon. parent is passed to QAbstractGraphicsShapeItem's constructor.

See also QGraphicsScene::addItem().

QGraphicsPolygonItem::~QGraphicsPolygonItem()

Destroys the QGraphicsPolygonItem.

QRectF QGraphicsPolygonItem::boundingRect() const [virtual]

Reimplemented from QGraphicsItem::boundingRect().

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

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().

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

Reimplemented from QGraphicsItem::isObscuredBy().

QPainterPath QGraphicsPolygonItem::opaqueArea() const [virtual]

Reimplemented from QGraphicsItem::opaqueArea().

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

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().

QPainterPath QGraphicsPolygonItem::shape() const [virtual]

Reimplemented from QGraphicsItem::shape().

int QGraphicsPolygonItem::type() const [virtual]

Reimplemented from QGraphicsItem::type().

© 2012 Nokia Corporation and/or its subsidiaries. Documentation contributions included herein are the copyrights of their respective owners.


The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation.

Documentation sources may be obtained from www.qt-project.org.


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