Biomedical Image Analysis Library
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QCPItemCurve Class Reference

A curved line from one point to another. More...

#include <qcustomplot.h>

Inheritance diagram for QCPItemCurve:
Inheritance graph
Collaboration diagram for QCPItemCurve:
Collaboration graph

Public Member Functions

 QCPItemCurve (QCustomPlot *parentPlot)
 
virtual ~QCPItemCurve ()
 
QPen pen () const
 
QPen selectedPen () const
 
QCPLineEnding head () const
 
QCPLineEnding tail () const
 
void setPen (const QPen &pen)
 
void setSelectedPen (const QPen &pen)
 
void setHead (const QCPLineEnding &head)
 
void setTail (const QCPLineEnding &tail)
 
virtual double selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=0) const
 
- Public Member Functions inherited from QCPAbstractItem
 QCPAbstractItem (QCustomPlot *parentPlot)
 
virtual ~QCPAbstractItem ()
 
bool clipToAxisRect () const
 
QCPAxisRect * clipAxisRect () 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
 
QCPItemPosition * position (const QString &name) const
 
QCPItemAnchor * anchor (const QString &name) const
 
bool hasAnchor (const QString &name) const
 
- Public Member Functions inherited from QCPLayerable
 QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=0)
 
 ~QCPLayerable ()
 
bool visible () const
 
QCustomPlot * parentPlot () const
 
QCPLayerable * parentLayerable () const
 
QCPLayer * layer () 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 Attributes

QCPItemPosition *const start
 
QCPItemPosition *const startDir
 
QCPItemPosition *const endDir
 
QCPItemPosition *const end
 

Protected Member Functions

virtual void draw (QCPPainter *painter)
 
QPen mainPen () const
 
- Protected Member 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)
 
virtual QPointF anchorPixelPoint (int anchorId) const
 
double distSqrToLine (const QPointF &start, const QPointF &end, const QPointF &point) const
 
double rectSelectTest (const QRectF &rect, const QPointF &pos, bool filledRect) const
 
QCPItemPosition * createPosition (const QString &name)
 
QCPItemAnchor * createAnchor (const QString &name, int anchorId)
 
- Protected Member Functions inherited from QCPLayerable
virtual void parentPlotInitialized (QCustomPlot *parentPlot)
 
void initializeParentPlot (QCustomPlot *parentPlot)
 
void setParentLayerable (QCPLayerable *parentLayerable)
 
bool moveToLayer (QCPLayer *layer, bool prepend)
 
void applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
 

Protected Attributes

QPen mPen
 
QPen mSelectedPen
 
QCPLineEnding mHead
 
QCPLineEnding mTail
 
- Protected Attributes inherited from QCPAbstractItem
bool mClipToAxisRect
 
QPointer< QCPAxisRect > mClipAxisRect
 
QList< QCPItemPosition * > mPositions
 
QList< QCPItemAnchor * > mAnchors
 
bool mSelectable
 
bool mSelected
 
- Protected Attributes inherited from QCPLayerable
bool mVisible
 
QCustomPlot * mParentPlot
 
QPointer< QCPLayerable > mParentLayerable
 
QCPLayer * mLayer
 
bool mAntialiased
 

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

A curved line from one point to another.

QCPItemCurve.png
Curve example. Blue dotted circles are anchors, solid blue discs are positions.

It has four positions, start and end, which define the end points of the line, and two control points which define the direction the line exits from the start and the direction from which it approaches the end: startDir and endDir.

With setHead and setTail you may set different line ending styles, e.g. to create an arrow.

Often it is desirable for the control points to stay at fixed relative positions to the start/end point. This can be achieved by setting the parent anchor e.g. of startDir simply to start, and then specify the desired pixel offset with QCPItemPosition::setCoords on startDir.

Definition at line 3321 of file qcustomplot.h.

Constructor & Destructor Documentation

QCPItemCurve::QCPItemCurve ( QCustomPlot *  parentPlot)

Creates a curve item and sets default values.

The constructed item can be added to the plot with QCustomPlot::addItem.

Definition at line 21884 of file qcustomplot.cpp.

QCPItemCurve::~QCPItemCurve ( )
virtual

Definition at line 21900 of file qcustomplot.cpp.

Member Function Documentation

void QCPItemCurve::draw ( QCPPainter *  painter)
protectedvirtual

Implements QCPAbstractItem.

Definition at line 21977 of file qcustomplot.cpp.

QCPLineEnding QCPItemCurve::head ( ) const
inline

Definition at line 3337 of file qcustomplot.h.

QPen QCPItemCurve::mainPen ( ) const
protected

Definition at line 22011 of file qcustomplot.cpp.

QPen QCPItemCurve::pen ( ) const
inline

Definition at line 3335 of file qcustomplot.h.

QPen QCPItemCurve::selectedPen ( ) const
inline

Definition at line 3336 of file qcustomplot.h.

double QCPItemCurve::selectTest ( const QPointF &  pos,
bool  onlySelectable,
QVariant *  details = 0 
) 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.

You may pass 0 as details to indicate that you are not interested in those selection details.

See also
selectEvent, deselectEvent, QCustomPlot::setInteractions

Implements QCPAbstractItem.

Definition at line 21951 of file qcustomplot.cpp.

void QCPItemCurve::setHead ( const QCPLineEnding &  head)

Sets the line ending style of the head. The head corresponds to the end position.

Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle here, e.g.

setHead(QCPLineEnding::esSpikeArrow)
See also
setTail

Definition at line 21932 of file qcustomplot.cpp.

void QCPItemCurve::setPen ( const QPen &  pen)

Sets the pen that will be used to draw the line

See also
setSelectedPen

Definition at line 21909 of file qcustomplot.cpp.

void QCPItemCurve::setSelectedPen ( const QPen &  pen)

Sets the pen that will be used to draw the line when selected

See also
setPen, setSelected

Definition at line 21919 of file qcustomplot.cpp.

void QCPItemCurve::setTail ( const QCPLineEnding &  tail)

Sets the line ending style of the tail. The tail corresponds to the start position.

Note that due to the overloaded QCPLineEnding constructor, you may directly specify a QCPLineEnding::EndingStyle here, e.g.

setTail(QCPLineEnding::esSpikeArrow)
See also
setHead

Definition at line 21945 of file qcustomplot.cpp.

QCPLineEnding QCPItemCurve::tail ( ) const
inline

Definition at line 3338 of file qcustomplot.h.

Member Data Documentation

QCPItemPosition* const QCPItemCurve::end

Definition at line 3352 of file qcustomplot.h.

QCPItemPosition* const QCPItemCurve::endDir

Definition at line 3351 of file qcustomplot.h.

QCPLineEnding QCPItemCurve::mHead
protected

Definition at line 3357 of file qcustomplot.h.

QPen QCPItemCurve::mPen
protected

Definition at line 3356 of file qcustomplot.h.

QPen QCPItemCurve::mSelectedPen
protected

Definition at line 3356 of file qcustomplot.h.

QCPLineEnding QCPItemCurve::mTail
protected

Definition at line 3357 of file qcustomplot.h.

QCPItemPosition* const QCPItemCurve::start

Definition at line 3349 of file qcustomplot.h.

QCPItemPosition* const QCPItemCurve::startDir

Definition at line 3350 of file qcustomplot.h.

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