QCPCurve

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Inheritance diagram for QCPCurve:

Public Types

enum  LineStyle { lsNone, lsLine }
 

Public Member Functions

 QCPCurve (QCPAxis *keyAxis, QCPAxis *valueAxis)
 
void addData (const QVector< double > &keys, const QVector< double > &values)
 
void addData (const QVector< double > &t, const QVector< double > &keys, const QVector< double > &values, bool alreadySorted=false)
 
void addData (double key, double value)
 
void addData (double t, double key, double value)
 
QSharedPointer< QCPCurveDataContainerdata () const
 
virtual QCPRange getKeyRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth) const override
 
virtual QCPRange getValueRange (bool &foundRange, QCP::SignDomain inSignDomain=QCP::sdBoth, const QCPRange &inKeyRange=QCPRange()) const override
 
LineStyle lineStyle () const
 
int scatterSkip () const
 
QCPScatterStyle scatterStyle () const
 
virtual double selectTest (const QPointF &pos, bool onlySelectable, QVariant *details=nullptr) const override
 
void setData (const QVector< double > &keys, const QVector< double > &values)
 
void setData (const QVector< double > &t, const QVector< double > &keys, const QVector< double > &values, bool alreadySorted=false)
 
void setData (QSharedPointer< QCPCurveDataContainer > data)
 
void setLineStyle (LineStyle style)
 
void setScatterSkip (int skip)
 
void setScatterStyle (const QCPScatterStyle &style)
 
- Public Member Functions inherited from QCPAbstractPlottable1D< QCPCurveData >
 QCPAbstractPlottable1D (QCPAxis *keyAxis, QCPAxis *valueAxis)
 
virtual int dataCount () const override
 
virtual double dataMainKey (int index) const override
 
virtual double dataMainValue (int index) const override
 
virtual QPointF dataPixelPosition (int index) const override
 
virtual double dataSortKey (int index) const override
 
virtual QCPRange dataValueRange (int index) const override
 
virtual int findBegin (double sortKey, bool expandedRange=true) const override
 
virtual int findEnd (double sortKey, bool expandedRange=true) const override
 
virtual QCPPlottableInterface1Dinterface1D () override
 
virtual QCPDataSelection selectTestRect (const QRectF &rect, bool onlySelectable) const override
 
virtual bool sortKeyIsMainKey () const override
 
- Public Member Functions inherited from QCPAbstractPlottable
 QCPAbstractPlottable (QCPAxis *keyAxis, QCPAxis *valueAxis)
 
bool addToLegend ()
 
bool addToLegend (QCPLegend *legend)
 
bool antialiasedFill () const
 
bool antialiasedScatters () const
 
QBrush brush () const
 
const QPointF coordsToPixels (double key, double value) const
 
void coordsToPixels (double key, double value, double &x, double &y) const
 
QCPAxiskeyAxis () const
 
QString name () const
 
QPen pen () const
 
void pixelsToCoords (const QPointF &pixelPos, double &key, double &value) const
 
void pixelsToCoords (double x, double y, double &key, double &value) const
 
bool removeFromLegend () const
 
bool removeFromLegend (QCPLegend *legend) const
 
void rescaleAxes (bool onlyEnlarge=false) const
 
void rescaleKeyAxis (bool onlyEnlarge=false) const
 
void rescaleValueAxis (bool onlyEnlarge=false, bool inKeyRange=false) const
 
QCP::SelectionType selectable () const
 
bool selected () const
 
QCPDataSelection selection () const
 
QCPSelectionDecoratorselectionDecorator () const
 
void setAntialiasedFill (bool enabled)
 
void setAntialiasedScatters (bool enabled)
 
void setBrush (const QBrush &brush)
 
void setKeyAxis (QCPAxis *axis)
 
void setName (const QString &name)
 
void setPen (const QPen &pen)
 
Q_SLOT void setSelectable (QCP::SelectionType selectable)
 
Q_SLOT void setSelection (QCPDataSelection selection)
 
void setSelectionDecorator (QCPSelectionDecorator *decorator)
 
void setValueAxis (QCPAxis *axis)
 
QCPAxisvalueAxis () const
 
- Public Member Functions inherited from QCPLayerable
 QCPLayerable (QCustomPlot *plot, QString targetLayer=QString(), QCPLayerable *parentLayerable=nullptr)
 
bool antialiased () const
 
QCPLayerlayer () const
 
QCPLayerableparentLayerable () const
 
QCustomPlotparentPlot () const
 
bool realVisibility () const
 
void setAntialiased (bool enabled)
 
bool setLayer (const QString &layerName)
 
Q_SLOT bool setLayer (QCPLayer *layer)
 
void setVisible (bool on)
 
bool visible () const
 
- Public Member Functions inherited from QObject
 QObject (QObject *parent)
 
bool blockSignals (bool block)
 
const QObjectListchildren () const const
 
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *method, Qt::ConnectionType type) const const
 
void deleteLater ()
 
void destroyed (QObject *obj)
 
bool disconnect (const char *signal, const QObject *receiver, const char *method) const const
 
bool disconnect (const QObject *receiver, const char *method) const const
 
void dumpObjectInfo ()
 
void dumpObjectInfo () const const
 
void dumpObjectTree ()
 
void dumpObjectTree () const const
 
QList< QByteArraydynamicPropertyNames () const const
 
virtual bool event (QEvent *e)
 
virtual bool eventFilter (QObject *watched, QEvent *event)
 
findChild (const QString &name, Qt::FindChildOptions options) const const
 
QList< T > findChildren (const QRegExp &regExp, Qt::FindChildOptions options) const const
 
QList< T > findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const
 
QList< T > findChildren (const QString &name, Qt::FindChildOptions options) const const
 
bool inherits (const char *className) const const
 
void installEventFilter (QObject *filterObj)
 
bool isWidgetType () const const
 
bool isWindowType () const const
 
void killTimer (int id)
 
virtual const QMetaObjectmetaObject () const const
 
void moveToThread (QThread *targetThread)
 
QString objectName () const const
 
void objectNameChanged (const QString &objectName)
 
QObjectparent () const const
 
QVariant property (const char *name) const const
 
 Q_CLASSINFO (Name, Value)
 
 Q_DISABLE_COPY (Class)
 
 Q_DISABLE_COPY_MOVE (Class)
 
 Q_DISABLE_MOVE (Class)
 
 Q_EMIT Q_EMIT
 
 Q_ENUM (...)
 
 Q_ENUM_NS (...)
 
 Q_ENUMS (...)
 
 Q_FLAG (...)
 
 Q_FLAG_NS (...)
 
 Q_FLAGS (...)
 
 Q_GADGET Q_GADGET
 
 Q_INTERFACES (...)
 
 Q_INVOKABLE Q_INVOKABLE
 
 Q_NAMESPACE Q_NAMESPACE
 
 Q_NAMESPACE_EXPORT (EXPORT_MACRO)
 
 Q_OBJECT Q_OBJECT
 
 Q_PROPERTY (...)
 
 Q_REVISION Q_REVISION
 
 Q_SET_OBJECT_NAME (Object)
 
 Q_SIGNAL Q_SIGNAL
 
 Q_SIGNALS Q_SIGNALS
 
 Q_SLOT Q_SLOT
 
 Q_SLOTS Q_SLOTS
 
qFindChild (const QObject *obj, const QString &name)
 
QList< T > qFindChildren (const QObject *obj, const QRegExp &regExp)
 
QList< T > qFindChildren (const QObject *obj, const QString &name)
 
qobject_cast (const QObject *object)
 
qobject_cast (QObject *object)
 
 QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT
 
void removeEventFilter (QObject *obj)
 
void setObjectName (const QString &name)
 
void setParent (QObject *parent)
 
bool setProperty (const char *name, const QVariant &value)
 
bool signalsBlocked () const const
 
int startTimer (int interval, Qt::TimerType timerType)
 
int startTimer (std::chrono::milliseconds time, Qt::TimerType timerType)
 
QThreadthread () const const
 
- Public Member Functions inherited from QCPPlottableInterface1D
virtual int dataCount () const =0
 
virtual bool sortKeyIsMainKey () const =0
 

Protected Member Functions

virtual void draw (QCPPainter *painter) override
 
virtual void drawCurveLine (QCPPainter *painter, const QVector< QPointF > &lines) const
 
virtual void drawLegendIcon (QCPPainter *painter, const QRectF &rect) const override
 
virtual void drawScatterPlot (QCPPainter *painter, const QVector< QPointF > &points, const QCPScatterStyle &style) const
 
void getCurveLines (QVector< QPointF > *lines, const QCPDataRange &dataRange, double penWidth) const
 
QVector< QPointFgetOptimizedCornerPoints (int prevRegion, int currentRegion, double prevKey, double prevValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
 
QPointF getOptimizedPoint (int otherRegion, double otherKey, double otherValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
 
int getRegion (double key, double value, double keyMin, double valueMax, double keyMax, double valueMin) const
 
void getScatters (QVector< QPointF > *scatters, const QCPDataRange &dataRange, double scatterWidth) const
 
bool getTraverse (double prevKey, double prevValue, double key, double value, double keyMin, double valueMax, double keyMax, double valueMin, QPointF &crossA, QPointF &crossB) const
 
void getTraverseCornerPoints (int prevRegion, int currentRegion, double keyMin, double valueMax, double keyMax, double valueMin, QVector< QPointF > &beforeTraverse, QVector< QPointF > &afterTraverse) const
 
bool mayTraverse (int prevRegion, int currentRegion) const
 
double pointDistance (const QPointF &pixelPoint, QCPCurveDataContainer::const_iterator &closestData) const
 
- Protected Member Functions inherited from QCPAbstractPlottable1D< QCPCurveData >
void drawPolyline (QCPPainter *painter, const QVector< QPointF > &lineData) const
 
void getDataSegments (QList< QCPDataRange > &selectedSegments, QList< QCPDataRange > &unselectedSegments) const
 
- Protected Member Functions inherited from QCPAbstractPlottable
void applyDefaultAntialiasingHint (QCPPainter *painter) const override
 
void applyFillAntialiasingHint (QCPPainter *painter) const
 
void applyScattersAntialiasingHint (QCPPainter *painter) const
 
virtual QRect clipRect () const override
 
virtual void deselectEvent (bool *selectionStateChanged) override
 
virtual void selectEvent (QMouseEvent *event, bool additive, const QVariant &details, bool *selectionStateChanged) override
 
virtual QCP::Interaction selectionCategory () const override
 
- Protected Member Functions inherited from QCPLayerable
void applyAntialiasingHint (QCPPainter *painter, bool localAntialiased, QCP::AntialiasedElement overrideElement) const
 
void initializeParentPlot (QCustomPlot *parentPlot)
 
virtual void mouseDoubleClickEvent (QMouseEvent *event, const QVariant &details)
 
virtual void mouseMoveEvent (QMouseEvent *event, const QPointF &startPos)
 
virtual void mousePressEvent (QMouseEvent *event, const QVariant &details)
 
virtual void mouseReleaseEvent (QMouseEvent *event, const QPointF &startPos)
 
bool moveToLayer (QCPLayer *layer, bool prepend)
 
virtual void parentPlotInitialized (QCustomPlot *parentPlot)
 
void setParentLayerable (QCPLayerable *parentLayerable)
 
virtual void wheelEvent (QWheelEvent *event)
 
- Protected Member Functions inherited from QObject
virtual void childEvent (QChildEvent *event)
 
virtual void connectNotify (const QMetaMethod &signal)
 
virtual void customEvent (QEvent *event)
 
virtual void disconnectNotify (const QMetaMethod &signal)
 
bool isSignalConnected (const QMetaMethod &signal) const const
 
int receivers (const char *signal) const const
 
QObjectsender () const const
 
int senderSignalIndex () const const
 
virtual void timerEvent (QTimerEvent *event)
 

Protected Attributes

LineStyle mLineStyle
 
int mScatterSkip
 
QCPScatterStyle mScatterStyle
 
- Protected Attributes inherited from QCPAbstractPlottable1D< QCPCurveData >
QSharedPointer< QCPDataContainer< QCPCurveData > > mDataContainer
 
- Protected Attributes inherited from QCPAbstractPlottable
bool mAntialiasedFill
 
bool mAntialiasedScatters
 
QBrush mBrush
 
QPointer< QCPAxismKeyAxis
 
QString mName
 
QPen mPen
 
QCP::SelectionType mSelectable
 
QCPDataSelection mSelection
 
QCPSelectionDecoratormSelectionDecorator
 
QPointer< QCPAxismValueAxis
 
- Protected Attributes inherited from QCPLayerable
bool mAntialiased
 
QCPLayermLayer
 
QPointer< QCPLayerablemParentLayerable
 
QCustomPlotmParentPlot
 
bool mVisible
 

Additional Inherited Members

- Properties inherited from QObject
 objectName
 
- Signals inherited from QCPAbstractPlottable
void selectableChanged (QCP::SelectionType selectable)
 
void selectionChanged (bool selected)
 
void selectionChanged (const QCPDataSelection &selection)
 
- Signals inherited from QCPLayerable
void layerChanged (QCPLayer *newLayer)
 
- Static Public Member Functions inherited from QObject
QMetaObject::Connection connect (const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
 
QMetaObject::Connection connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type)
 
QMetaObject::Connection connect (const QObject *sender, PointerToMemberFunction signal, const QObject *context, Functor functor, Qt::ConnectionType type)
 
QMetaObject::Connection connect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method, Qt::ConnectionType type)
 
QMetaObject::Connection connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)
 
bool disconnect (const QMetaObject::Connection &connection)
 
bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *method)
 
bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method)
 
bool disconnect (const QObject *sender, PointerToMemberFunction signal, const QObject *receiver, PointerToMemberFunction method)
 
QString tr (const char *sourceText, const char *disambiguation, int n)
 
QString trUtf8 (const char *sourceText, const char *disambiguation, int n)
 
- Public Attributes inherited from QObject
typedef QObjectList
 

Detailed Description

A plottable representing a parametric curve in a plot.

Unlike QCPGraph, plottables of this type may have multiple points with the same key coordinate, so their visual representation can have loops. This is realized by introducing a third coordinate t, which defines the order of the points described by the other two coordinates x and y.

To plot data, assign it with the setData or addData functions. Alternatively, you can also access and modify the curve's data via the data method, which returns a pointer to the internal QCPCurveDataContainer.

Gaps in the curve can be created by adding data points with NaN as key and value (qQNaN() or std::numeric_limits<double>::quiet_NaN()) in between the two data points that shall be separated.

Changing the appearance

The appearance of the curve is determined by the pen and the brush (setPen, setBrush).

Usage

Like all data representing objects in QCustomPlot, the QCPCurve is a plottable (QCPAbstractPlottable). So the plottable-interface of QCustomPlot applies (QCustomPlot::plottable, QCustomPlot::removePlottable, etc.)

Usually, you first create an instance:

which registers it with the QCustomPlot instance of the passed axes. Note that this QCustomPlot instance takes ownership of the plottable, so do not delete it manually but use QCustomPlot::removePlottable() instead. The newly created plottable can be modified, e.g.:

Definition at line 5580 of file qcustomplot.h.

Member Enumeration Documentation

◆ LineStyle

Defines how the curve's line is represented visually in the plot. The line is drawn with the current pen of the curve (setPen).

See also
setLineStyle
Enumerator
lsNone 

No line is drawn between data points (e.g. only scatters)

lsLine 

Data points are connected with a straight line.

Definition at line 5594 of file qcustomplot.h.

Constructor & Destructor Documentation

◆ QCPCurve()

QCPCurve::QCPCurve ( QCPAxis keyAxis,
QCPAxis valueAxis 
)
explicit

Constructs a curve which uses keyAxis as its key axis ("x") and valueAxis as its value axis ("y"). keyAxis and valueAxis must reside in the same QCustomPlot instance and not have the same orientation. If either of these restrictions is violated, a corresponding message is printed to the debug output (qDebug), the construction is not aborted, though.

The created QCPCurve is automatically registered with the QCustomPlot instance inferred from keyAxis. This QCustomPlot instance takes ownership of the QCPCurve, so do not delete it manually but use QCustomPlot::removePlottable() instead.

Definition at line 22633 of file qcustomplot.cpp.

Member Function Documentation

◆ addData() [1/4]

void QCPCurve::addData ( const QVector< double > &  keys,
const QVector< double > &  values 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Adds the provided points in keys and values to the current data. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

The t parameter of each data point will be set to the integer index of the respective key/value pair.

Alternatively, you can also access and modify the data directly via the data method, which returns a pointer to the internal data container.

Definition at line 22790 of file qcustomplot.cpp.

◆ addData() [2/4]

void QCPCurve::addData ( const QVector< double > &  t,
const QVector< double > &  keys,
const QVector< double > &  values,
bool  alreadySorted = false 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Adds the provided points in t, keys and values to the current data. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

If you can guarantee that the passed data points are sorted by keys in ascending order, you can set alreadySorted to true, to improve performance by saving a sorting run.

Alternatively, you can also access and modify the data directly via the data method, which returns a pointer to the internal data container.

Definition at line 22758 of file qcustomplot.cpp.

◆ addData() [3/4]

void QCPCurve::addData ( double  key,
double  value 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Adds the provided data point as key and value to the current data.

The t parameter is generated automatically by increments of 1 for each point, starting at the highest t of previously existing data or 0, if the curve data is empty.

Alternatively, you can also access and modify the data directly via the data method, which returns a pointer to the internal data container.

Definition at line 22836 of file qcustomplot.cpp.

◆ addData() [4/4]

void QCPCurve::addData ( double  t,
double  key,
double  value 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Adds the provided data point as t, key and value to the current data.

Alternatively, you can also access and modify the data directly via the data method, which returns a pointer to the internal data container.

Definition at line 22821 of file qcustomplot.cpp.

◆ data()

QSharedPointer< QCPCurveDataContainer > QCPCurve::data ( ) const
inline

Returns a shared pointer to the internal data storage of type QCPCurveDataContainer. You may use it to directly manipulate the data, which may be more convenient and faster than using the regular setData or addData methods.

Definition at line 5603 of file qcustomplot.h.

◆ draw()

void QCPCurve::draw ( QCPPainter painter)
overrideprotectedvirtual

This function draws the layerable with the specified painter. It is only called by QCustomPlot, if the layerable is visible (setVisible).

Before this function is called, the painter's antialiasing state is set via applyDefaultAntialiasingHint, see the documentation there. Further, the clipping rectangle was set to clipRect.

Implements QCPAbstractPlottable.

Definition at line 22886 of file qcustomplot.cpp.

◆ drawCurveLine()

void QCPCurve::drawCurveLine ( QCPPainter painter,
const QVector< QPointF > &  lines 
) const
protectedvirtual

Draws lines between the points in lines, given in pixel coordinates.

See also
drawScatterPlot, getCurveLines

Definition at line 22994 of file qcustomplot.cpp.

◆ drawLegendIcon()

void QCPCurve::drawLegendIcon ( QCPPainter painter,
const QRectF rect 
) const
overrideprotectedvirtual

called by QCPLegend::draw (via QCPPlottableLegendItem::draw) to create a graphical representation of this plottable inside rect, next to the plottable name.

The passed painter has its cliprect set to rect, so painting outside of rect won't appear outside the legend icon border.

Implements QCPAbstractPlottable.

Definition at line 22954 of file qcustomplot.cpp.

◆ drawScatterPlot()

void QCPCurve::drawScatterPlot ( QCPPainter painter,
const QVector< QPointF > &  points,
const QCPScatterStyle style 
) const
protectedvirtual

Draws scatter symbols at every point passed in points, given in pixel coordinates. The scatters will be drawn with painter and have the appearance as specified in style.

See also
drawCurveLine, getCurveLines

Definition at line 23010 of file qcustomplot.cpp.

◆ getCurveLines()

void QCPCurve::getCurveLines ( QVector< QPointF > *  lines,
const QCPDataRange dataRange,
double  penWidth 
) const
protected

Called by draw to generate points in pixel coordinates which represent the line of the curve.

Line segments that aren't visible in the current axis rect are handled in an optimized way. They are projected onto a rectangle slightly larger than the visible axis rect and simplified regarding point count. The algorithm makes sure to preserve appearance of lines and fills inside the visible axis rect by generating new temporary points on the outer rect if necessary.

lines will be filled with points in pixel coordinates, that can be drawn with drawCurveLine.

dataRange specifies the beginning and ending data indices that will be taken into account for conversion. In this function, the specified range may exceed the total data bounds without harm: a correspondingly trimmed data range will be used. This takes the burden off the user of this function to check for valid indices in dataRange, e.g. when extending ranges coming from getDataSegments.

penWidth specifies the pen width that will be used to later draw the lines generated by this function. This is needed here to calculate an accordingly wider margin around the axis rect when performing the line optimization.

Methods that are also involved in the algorithm are: getRegion, getOptimizedPoint, getOptimizedCornerPoints mayTraverse, getTraverse, getTraverseCornerPoints.

See also
drawCurveLine, drawScatterPlot

Definition at line 23048 of file qcustomplot.cpp.

◆ getKeyRange()

QCPRange QCPCurve::getKeyRange ( bool &  foundRange,
QCP::SignDomain  inSignDomain = QCP::sdBoth 
) const
overridevirtual

Returns the coordinate range that all data in this plottable span in the key axis dimension. For logarithmic plots, one can set inSignDomain to either QCP::sdNegative or QCP::sdPositive in order to restrict the returned range to that sign domain. E.g. when only negative range is wanted, set inSignDomain to QCP::sdNegative and all positive points will be ignored for range calculation. For no restriction, just set inSignDomain to QCP::sdBoth (default). foundRange is an output parameter that indicates whether a range could be found or not. If this is false, you shouldn't use the returned range (e.g. no points in data).

Note that foundRange is not the same as QCPRange::validRange, since the range returned by this function may have size zero (e.g. when there is only one data point). In this case foundRange would return true, but the returned range is not a valid range in terms of QCPRange::validRange.

See also
rescaleAxes, getValueRange

Implements QCPAbstractPlottable.

Definition at line 22874 of file qcustomplot.cpp.

◆ getOptimizedCornerPoints()

QVector< QPointF > QCPCurve::getOptimizedCornerPoints ( int  prevRegion,
int  currentRegion,
double  prevKey,
double  prevValue,
double  key,
double  value,
double  keyMin,
double  valueMax,
double  keyMax,
double  valueMin 
) const
protected

This function is part of the curve optimization algorithm of getCurveLines.

In situations where a single segment skips over multiple regions it might become necessary to add extra points at the corners of region 5 (see getRegion) such that the optimized segment doesn't unintentionally cut through the visible area of the axis rect and create plot artifacts. This method provides these points that must be added, assuming the original segment doesn't start, end, or traverse region 5. (Corner points where region 5 is traversed are calculated by getTraverseCornerPoints.)

For example, consider a segment which directly goes from region 4 to 2 but originally is far out to the top left such that it doesn't cross region 5. Naively optimizing these points by projecting them on the top and left borders of region 5 will create a segment that surely crosses 5, creating a visual artifact in the plot. This method prevents this by providing extra points at the top left corner, making the optimized curve correctly pass from region 4 to 1 to 2 without traversing 5.

Definition at line 23409 of file qcustomplot.cpp.

◆ getOptimizedPoint()

QPointF QCPCurve::getOptimizedPoint ( int  otherRegion,
double  otherKey,
double  otherValue,
double  key,
double  value,
double  keyMin,
double  valueMax,
double  keyMax,
double  valueMin 
) const
protected

This function is part of the curve optimization algorithm of getCurveLines.

This method is used in case the current segment passes from inside the visible rect (region 5, see getRegion) to any of the outer regions (otherRegion). The current segment is given by the line connecting (key, value) with (otherKey, otherValue).

It returns the intersection point of the segment with the border of region 5.

For this function it doesn't matter whether (key, value) is the point inside region 5 or whether it's (otherKey, otherValue), i.e. whether the segment is coming from region 5 or leaving it. It is important though that otherRegion correctly identifies the other region not equal to 5.

Definition at line 23293 of file qcustomplot.cpp.

◆ getRegion()

int QCPCurve::getRegion ( double  key,
double  value,
double  keyMin,
double  valueMax,
double  keyMax,
double  valueMin 
) const
protected

This function is part of the curve optimization algorithm of getCurveLines.

It returns the region of the given point (key, value) with respect to a rectangle defined by keyMin, keyMax, valueMin, and valueMax.

The regions are enumerated from top to bottom (valueMin to valueMax) and left to right (keyMin to keyMax):

147
258
369

With the rectangle being region 5, and the outer regions extending infinitely outwards. In the curve optimization algorithm, region 5 is considered to be the visible portion of the plot.

Definition at line 23249 of file qcustomplot.cpp.

◆ getScatters()

void QCPCurve::getScatters ( QVector< QPointF > *  scatters,
const QCPDataRange dataRange,
double  scatterWidth 
) const
protected

Called by draw to generate points in pixel coordinates which represent the scatters of the curve. If a scatter skip is configured (setScatterSkip), the returned points are accordingly sparser.

Scatters that aren't visible in the current axis rect are optimized away.

scatters will be filled with points in pixel coordinates, that can be drawn with drawScatterPlot.

dataRange specifies the beginning and ending data indices that will be taken into account for conversion.

scatterWidth specifies the scatter width that will be used to later draw the scatters at pixel coordinates generated by this function. This is needed here to calculate an accordingly wider margin around the axis rect when performing the data point reduction.

See also
draw, drawScatterPlot

Definition at line 23151 of file qcustomplot.cpp.

◆ getTraverse()

bool QCPCurve::getTraverse ( double  prevKey,
double  prevValue,
double  key,
double  value,
double  keyMin,
double  valueMax,
double  keyMax,
double  valueMin,
QPointF crossA,
QPointF crossB 
) const
protected

This function is part of the curve optimization algorithm of getCurveLines.

This method assumes that the mayTraverse test has returned true, so there is a chance the segment defined by (prevKey, prevValue) and (key, value) goes through the visible region 5.

The return value of this method indicates whether the segment actually traverses region 5 or not.

If the segment traverses 5, the output parameters crossA and crossB indicate the entry and exit points of region 5. They will become the optimized points for that segment.

Definition at line 23676 of file qcustomplot.cpp.

◆ getTraverseCornerPoints()

void QCPCurve::getTraverseCornerPoints ( int  prevRegion,
int  currentRegion,
double  keyMin,
double  valueMax,
double  keyMax,
double  valueMin,
QVector< QPointF > &  beforeTraverse,
QVector< QPointF > &  afterTraverse 
) const
protected

This function is part of the curve optimization algorithm of getCurveLines.

This method assumes that the getTraverse test has returned true, so the segment definitely traverses the visible region 5 when going from prevRegion to currentRegion.

In certain situations it is not sufficient to merely generate the entry and exit points of the segment into/out of region 5, as getTraverse provides. It may happen that a single segment, in addition to traversing region 5, skips another region outside of region 5, which makes it necessary to add an optimized corner point there (very similar to the job getOptimizedCornerPoints does for segments that are completely in outside regions and don't traverse 5).

As an example, consider a segment going from region 1 to region 6, traversing the lower left corner of region 5. In this configuration, the segment additionally crosses the border between region 1 and 2 before entering region 5. This makes it necessary to add an additional point in the top left corner, before adding the optimized traverse points. So in this case, the output parameter beforeTraverse will contain the top left corner point, and afterTraverse will be empty.

In some cases, such as when going from region 1 to 9, it may even be necessary to add additional corner points before and after the traverse. Then both beforeTraverse and afterTraverse return the respective corner points.

Definition at line 23789 of file qcustomplot.cpp.

◆ getValueRange()

QCPRange QCPCurve::getValueRange ( bool &  foundRange,
QCP::SignDomain  inSignDomain = QCP::sdBoth,
const QCPRange inKeyRange = QCPRange() 
) const
overridevirtual

Returns the coordinate range that the data points in the specified key range (inKeyRange) span in the value axis dimension. For logarithmic plots, one can set inSignDomain to either QCP::sdNegative or QCP::sdPositive in order to restrict the returned range to that sign domain. E.g. when only negative range is wanted, set inSignDomain to QCP::sdNegative and all positive points will be ignored for range calculation. For no restriction, just set inSignDomain to QCP::sdBoth (default). foundRange is an output parameter that indicates whether a range could be found or not. If this is false, you shouldn't use the returned range (e.g. no points in data).

If inKeyRange has both lower and upper bound set to zero (is equal to QCPRange()), all data points are considered, without any restriction on the keys.

Note that foundRange is not the same as QCPRange::validRange, since the range returned by this function may have size zero (e.g. when there is only one data point). In this case foundRange would return true, but the returned range is not a valid range in terms of QCPRange::validRange.

See also
rescaleAxes, getKeyRange

Implements QCPAbstractPlottable.

Definition at line 22880 of file qcustomplot.cpp.

◆ mayTraverse()

bool QCPCurve::mayTraverse ( int  prevRegion,
int  currentRegion 
) const
protected

This function is part of the curve optimization algorithm of getCurveLines.

This method returns whether a segment going from prevRegion to currentRegion (see getRegion) may traverse the visible region 5. This function assumes that neither prevRegion nor currentRegion is 5 itself.

If this method returns false, the segment for sure doesn't pass region 5. If it returns true, the segment may or may not pass region 5 and a more fine-grained calculation must be used (getTraverse).

Definition at line 23573 of file qcustomplot.cpp.

◆ pointDistance()

double QCPCurve::pointDistance ( const QPointF pixelPoint,
QCPCurveDataContainer::const_iterator &  closestData 
) const
protected

Calculates the (minimum) distance (in pixels) the curve's representation has from the given pixelPoint in pixels. This is used to determine whether the curve was clicked or not, e.g. in selectTest. The closest data point to pixelPoint is returned in closestData. Note that if the curve has a line representation, the returned distance may be smaller than the distance to the closestData point, since the distance to the curve line is also taken into account.

If either the curve has no data or if the line style is lsNone and the scatter style's shape is QCPScatterStyle::ssNone (i.e. there is no visual representation of the curve), returns -1.0.

Definition at line 23885 of file qcustomplot.cpp.

◆ selectTest()

double QCPCurve::selectTest ( const QPointF pos,
bool  onlySelectable,
QVariant details = nullptr 
) const
overridevirtual

Implements a selectTest specific to this plottable's point geometry.

If details is not 0, it will be set to a QCPDataSelection, describing the closest data point to pos.

\seebaseclassmethod QCPAbstractPlottable::selectTest

Reimplemented from QCPAbstractPlottable1D< QCPCurveData >.

Definition at line 22852 of file qcustomplot.cpp.

◆ setData() [1/3]

void QCPCurve::setData ( const QVector< double > &  keys,
const QVector< double > &  values 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Replaces the current data with the provided points in keys and values. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

The t parameter of each data point will be set to the integer index of the respective key/value pair.

See also
addData

Definition at line 22700 of file qcustomplot.cpp.

◆ setData() [2/3]

void QCPCurve::setData ( const QVector< double > &  t,
const QVector< double > &  keys,
const QVector< double > &  values,
bool  alreadySorted = false 
)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Replaces the current data with the provided points in t, keys and values. The provided vectors should have equal length. Else, the number of added points will be the size of the smallest vector.

If you can guarantee that the passed data points are sorted by t in ascending order, you can set alreadySorted to true, to improve performance by saving a sorting run.

See also
addData

Definition at line 22682 of file qcustomplot.cpp.

◆ setData() [3/3]

void QCPCurve::setData ( QSharedPointer< QCPCurveDataContainer data)

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Replaces the current data container with the provided data container.

Since a QSharedPointer is used, multiple QCPCurves may share the same data container safely. Modifying the data in the container will then affect all curves that share the container. Sharing can be achieved by simply exchanging the data containers wrapped in shared pointers:

If you do not wish to share containers, but create a copy from an existing container, rather use the QCPDataContainer<DataType>::set method on the curve's data container directly:

See also
addData

Definition at line 22666 of file qcustomplot.cpp.

◆ setLineStyle()

void QCPCurve::setLineStyle ( QCPCurve::LineStyle  style)

Sets how the single data points are connected in the plot or how they are represented visually apart from the scatter symbol. For scatter-only plots, set style to lsNone and setScatterStyle to the desired scatter style.

See also
setScatterStyle

Definition at line 22741 of file qcustomplot.cpp.

◆ setScatterSkip()

void QCPCurve::setScatterSkip ( int  skip)

If scatters are displayed (scatter style not QCPScatterStyle::ssNone), skip number of scatter points are skipped/not drawn after every drawn scatter point.

This can be used to make the data appear sparser while for example still having a smooth line, and to improve performance for very high density plots.

If skip is set to 0 (default), all scatter points are drawn.

See also
setScatterStyle

Definition at line 22729 of file qcustomplot.cpp.

◆ setScatterStyle()

void QCPCurve::setScatterStyle ( const QCPScatterStyle style)

Sets the visual appearance of single data points in the plot. If set to QCPScatterStyle::ssNone, no scatter points are drawn (e.g. for line-only plots with appropriate line style).

See also
QCPScatterStyle, setLineStyle

Definition at line 22713 of file qcustomplot.cpp.


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