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QCPItemPixmap Class Reference

An arbitrary pixmap. More...

Inheritance diagram for QCPItemPixmap:
Inheritance graph

Public Functions

 QCPItemPixmap (QCustomPlot *parentPlot)
 
QPixmap pixmap () const
 
bool scaled () const
 
Qt::AspectRatioMode aspectRatioMode () const
 
Qt::TransformationMode transformationMode () const
 
QPen pen () const
 
QPen selectedPen () const
 
void setPixmap (const QPixmap &pixmap)
 
void setScaled (bool scaled, Qt::AspectRatioMode aspectRatioMode=Qt::KeepAspectRatio, Qt::TransformationMode transformationMode=Qt::SmoothTransformation)
 
void setPen (const QPen &pen)
 
void setSelectedPen (const QPen &pen)
 
virtual double selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const
 
- Public Functions inherited from QCPAbstractItem
 QCPAbstractItem (QCustomPlot *parentPlot)
 
bool clipToAxisRect () const
 
QCPAxisRectclipAxisRect () const
 
bool selectable () const
 
bool selected () const
 
void setClipToAxisRect (bool clip)
 
void setClipAxisRect (QCPAxisRect *rect)
 
Q_SLOT void setSelectable (bool selectable)
 
Q_SLOT void setSelected (bool selected)
 
QList< QCPItemPosition * > positions () const
 
QList< QCPItemAnchor * > anchors () const
 
QCPItemPositionposition (const QString &name) const
 
QCPItemAnchoranchor (const QString &name) const
 
bool hasAnchor (const QString &name) const
 
- Public Functions inherited from QCPLayerable
 QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=nullptr)
 
bool visible () const
 
QCustomPlotparentPlot () const
 
QCPLayerableparentLayerable () const
 
QCPLayerlayer () const
 
bool antialiased () const
 
void setVisible (bool on)
 
Q_SLOT bool setLayer (QCPLayer *layer)
 
bool setLayer (const QString &layerName)
 
void setAntialiased (bool enabled)
 
bool realVisibility () const
 

Public Members

QCPItemPosition *const topLeft
 
QCPItemPosition *const bottomRight
 
QCPItemAnchor *const top
 
QCPItemAnchor *const topRight
 
QCPItemAnchor *const right
 
QCPItemAnchor *const bottom
 
QCPItemAnchor *const bottomLeft
 
QCPItemAnchor *const left
 

Protected Types

enum  AnchorIndex
 

Protected Functions

virtual void draw (QCPPainter *painter)
 
virtual QPointF anchorPixelPosition (int anchorId) const
 
void updateScaledPixmap (QRect finalRect=QRect(), bool flipHorz=false, bool flipVert=false)
 
QRect getFinalRect (bool *flippedHorz=nullptr, bool *flippedVert=nullptr) const
 
QPen mainPen () const
 
- Protected Functions inherited from QCPAbstractItem
virtual QCP::Interaction selectionCategory () const
 
virtual QRect clipRect () const
 
virtual void applyDefaultAntialiasingHint (QCPPainter *painter) const
 
virtual void selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged)
 
virtual void deselectEvent (bool *selectionStateChanged)
 
double rectDistance (const QRectF &rect, const QPointF &pos, bool filledRect) const
 
QCPItemPositioncreatePosition (const QString &name)
 
QCPItemAnchorcreateAnchor (const QString &name, int anchorId)
 
- Protected Functions inherited from QCPLayerable
virtual void parentPlotInitialized (QCustomPlot *parentPlot)
 
virtual void mousePressEvent (QMouseEvent *event, const QVariant &details)
 
virtual void mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
 
virtual void mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
 
virtual void mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
 
virtual void wheelEvent (QWheelEvent *event)
 
void initializeParentPlot (QCustomPlot *parentPlot)
 
void setParentLayerable (QCPLayerable *parentLayerable)
 
bool moveToLayer (QCPLayer *layer, bool prepend)
 
void applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
 

Additional Inherited Members

- Signals inherited from QCPAbstractItem
void selectionChanged (bool selected)
 
void selectableChanged (bool selectable)
 
- Signals inherited from QCPLayerable
void layerChanged (QCPLayer *newLayer)
 

Detailed Description

An arbitrary pixmap.

QCPItemPixmap.png
Pixmap example. Blue dotted circles are anchors, solid blue discs are positions.

It has two positions, topLeft and bottomRight, which define the rectangle the pixmap will be drawn in. Depending on the scale setting (setScaled), the pixmap will be either scaled to fit the rectangle or be drawn aligned to the topLeft position.

If scaling is enabled and topLeft is further to the bottom/right than bottomRight (as shown on the right side of the example image), the pixmap will be flipped in the respective orientations.

Constructor & Destructor Documentation

§ QCPItemPixmap()

QCPItemPixmap::QCPItemPixmap ( QCustomPlot parentPlot)
explicit

Creates a rectangle item and sets default values.

The created item is automatically registered with parentPlot. This QCustomPlot instance takes ownership of the item, so do not delete it manually but use QCustomPlot::removeItem() instead.

Member Function Documentation

§ setPixmap()

void QCPItemPixmap::setPixmap ( const QPixmap &  pixmap)

Sets the pixmap that will be displayed.

§ setScaled()

void QCPItemPixmap::setScaled ( bool  scaled,
Qt::AspectRatioMode  aspectRatioMode = Qt::KeepAspectRatio,
Qt::TransformationMode  transformationMode = Qt::SmoothTransformation 
)

Sets whether the pixmap will be scaled to fit the rectangle defined by the topLeft and bottomRight positions.

§ setPen()

void QCPItemPixmap::setPen ( const QPen &  pen)

Sets the pen that will be used to draw a border around the pixmap.

See also
setSelectedPen, setBrush

§ setSelectedPen()

void QCPItemPixmap::setSelectedPen ( const QPen &  pen)

Sets the pen that will be used to draw a border around the pixmap when selected

See also
setPen, setSelected

§ selectTest()

double QCPItemPixmap::selectTest ( const QPointF &  pos,
bool  onlySelectable,
QVariant *  details = nullptr 
) const
virtual

This function is used to decide whether a click hits a layerable object or not.

pos is a point in pixel coordinates on the QCustomPlot surface. This function returns the shortest pixel distance of this point to the object. If the object is either invisible or the distance couldn't be determined, -1.0 is returned. Further, if onlySelectable is true and the object is not selectable, -1.0 is returned, too.

If the object is represented not by single lines but by an area like a QCPItemText or the bars of a QCPBars plottable, a click inside the area should also be considered a hit. In these cases this function thus returns a constant value greater zero but still below the parent plot's selection tolerance. (typically the selectionTolerance multiplied by 0.99).

Providing a constant value for area objects allows selecting line objects even when they are obscured by such area objects, by clicking close to the lines (i.e. closer than 0.99*selectionTolerance).

The actual setting of the selection state is not done by this function. This is handled by the parent QCustomPlot when the mouseReleaseEvent occurs, and the finally selected object is notified via the selectEvent/deselectEvent methods.

details is an optional output parameter. Every layerable subclass may place any information in details. This information will be passed to selectEvent when the parent QCustomPlot decides on the basis of this selectTest call, that the object was successfully selected. The subsequent call to selectEvent will carry the details. This is useful for multi-part objects (like QCPAxis). This way, a possibly complex calculation to decide which part was clicked is only done once in selectTest. The result (i.e. the actually clicked part) can then be placed in details. So in the subsequent selectEvent, the decision which part was selected doesn't have to be done a second time for a single selection operation.

In the case of 1D Plottables (QCPAbstractPlottable1D, like QCPGraph or QCPBars) details will be set to a QCPDataSelection, describing the closest data point to pos.

You may pass nullptr as details to indicate that you are not interested in those selection details.

See also
selectEvent, deselectEvent, mousePressEvent, wheelEvent, QCustomPlot::setInteractions, QCPAbstractPlottable1D::selectTestRect

Implements QCPAbstractItem.

§ draw()

void QCPItemPixmap::draw ( QCPPainter painter)
protectedvirtual

Draws this item with the provided painter.

The cliprect of the provided painter is set to the rect returned by clipRect before this function is called. The clipRect depends on the clipping settings defined by setClipToAxisRect and setClipAxisRect.

Implements QCPAbstractItem.

§ anchorPixelPosition()

QPointF QCPItemPixmap::anchorPixelPosition ( int  anchorId) const
protectedvirtual

Returns the pixel position of the anchor with Id anchorId. This function must be reimplemented in item subclasses if they want to provide anchors (QCPItemAnchor).

For example, if the item has two anchors with id 0 and 1, this function takes one of these anchor ids and returns the respective pixel points of the specified anchor.

See also
createAnchor

Reimplemented from QCPAbstractItem.

§ updateScaledPixmap()

void QCPItemPixmap::updateScaledPixmap ( QRect  finalRect = QRect(),
bool  flipHorz = false,
bool  flipVert = false 
)
protected

Creates the buffered scaled image (mScaledPixmap) to fit the specified finalRect. The parameters flipHorz and flipVert control whether the resulting image shall be flipped horizontally or vertically. (This is used when topLeft is further to the bottom/right than bottomRight.)

This function only creates the scaled pixmap when the buffered pixmap has a different size than the expected result, so calling this function repeatedly, e.g. in the draw function, does not cause expensive rescaling every time.

If scaling is disabled, sets mScaledPixmap to a null QPixmap.

§ getFinalRect()

QRect QCPItemPixmap::getFinalRect ( bool *  flippedHorz = nullptr,
bool *  flippedVert = nullptr 
) const
protected

Returns the final (tight) rect the pixmap is drawn in, depending on the current item positions and scaling settings.

The output parameters flippedHorz and flippedVert return whether the pixmap should be drawn flipped horizontally or vertically in the returned rect. (The returned rect itself is always normalized, i.e. the top left corner of the rect is actually further to the top/left than the bottom right corner). This is the case when the item position topLeft is further to the bottom/right than bottomRight.

If scaling is disabled, returns a rect with size of the original pixmap and the top left corner aligned with the item position topLeft. The position bottomRight is ignored.

§ mainPen()

QPen QCPItemPixmap::mainPen ( ) const
protected

Returns the pen that should be used for drawing lines. Returns mPen when the item is not selected and mSelectedPen when it is.


The documentation for this class was generated from the following files: