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Inheritance diagram for QCPSelectionDecoratorBracket:

Public Types

enum  BracketStyle {
  bsSquareBracket, bsHalfEllipse, bsEllipse, bsPlus,

Public Member Functions

 QCPSelectionDecoratorBracket ()
QBrush bracketBrush () const
int bracketHeight () const
QPen bracketPen () const
BracketStyle bracketStyle () const
int bracketWidth () const
virtual void drawBracket (QCPPainter *painter, int direction) const
virtual void drawDecoration (QCPPainter *painter, QCPDataSelection selection) override
void setBracketBrush (const QBrush &brush)
void setBracketHeight (int height)
void setBracketPen (const QPen &pen)
void setBracketStyle (BracketStyle style)
void setBracketWidth (int width)
void setTangentAverage (int pointCount)
void setTangentToData (bool enabled)
int tangentAverage () const
bool tangentToData () const
- Public Member Functions inherited from QCPSelectionDecorator
 QCPSelectionDecorator ()
void applyBrush (QCPPainter *painter) const
void applyPen (QCPPainter *painter) const
QBrush brush () const
virtual void copyFrom (const QCPSelectionDecorator *other)
QCPScatterStyle getFinalScatterStyle (const QCPScatterStyle &unselectedStyle) const
QPen pen () const
QCPScatterStyle scatterStyle () const
void setBrush (const QBrush &brush)
void setPen (const QPen &pen)
void setScatterStyle (const QCPScatterStyle &scatterStyle, QCPScatterStyle::ScatterProperties usedProperties=QCPScatterStyle::spPen)
void setUsedScatterProperties (const QCPScatterStyle::ScatterProperties &properties)
QCPScatterStyle::ScatterProperties usedScatterProperties () const

Protected Member Functions

QPointF getPixelCoordinates (const QCPPlottableInterface1D *interface1d, int dataIndex) const
double getTangentAngle (const QCPPlottableInterface1D *interface1d, int dataIndex, int direction) const
- Protected Member Functions inherited from QCPSelectionDecorator
virtual bool registerWithPlottable (QCPAbstractPlottable *plottable)

Protected Attributes

QBrush mBracketBrush
int mBracketHeight
QPen mBracketPen
BracketStyle mBracketStyle
int mBracketWidth
int mTangentAverage
bool mTangentToData
- Protected Attributes inherited from QCPSelectionDecorator
QBrush mBrush
QPen mPen
QCPScatterStyle mScatterStyle
QCPScatterStyle::ScatterProperties mUsedScatterProperties

Detailed Description

A selection decorator which draws brackets around each selected data segment.

Additionally to the regular highlighting of selected segments via color, fill and scatter style, this QCPSelectionDecorator subclass draws markers at the begin and end of each selected data segment of the plottable.

The shape of the markers can be controlled with setBracketStyle, setBracketWidth and setBracketHeight. The color/fill can be controlled with setBracketPen and setBracketBrush.

To introduce custom bracket styles, it is only necessary to sublcass QCPSelectionDecoratorBracket and reimplement drawBracket. The rest will be managed by the base class.

Definition at line 4801 of file qcustomplot.h.

Member Enumeration Documentation

◆ BracketStyle

Defines which shape is drawn at the boundaries of selected data ranges.

Some of the bracket styles further allow specifying a height and/or width, see setBracketHeight and setBracketWidth.


A square bracket is drawn.


A half ellipse is drawn. The size of the ellipse is given by the bracket width/height properties.


An ellipse is drawn. The size of the ellipse is given by the bracket width/height properties.


A plus is drawn.


Start custom bracket styles at this index when subclassing and reimplementing drawBracket.

Definition at line 4812 of file qcustomplot.h.

Constructor & Destructor Documentation

◆ QCPSelectionDecoratorBracket()

QCPSelectionDecoratorBracket::QCPSelectionDecoratorBracket ( )

Creates a new QCPSelectionDecoratorBracket instance with default values.

Definition at line 17158 of file qcustomplot.cpp.

Member Function Documentation

◆ drawBracket()

void QCPSelectionDecoratorBracket::drawBracket ( QCPPainter painter,
int  direction 
) const

Draws the bracket shape with painter. The parameter direction is either -1 or 1 and indicates whether the bracket shall point to the left or the right (i.e. is a closing or opening bracket, respectively).

The passed painter already contains all transformations that are necessary to position and rotate the bracket appropriately. Painting operations can be performed as if drawing upright brackets on flat data with horizontal key axis, with (0, 0) being the center of the bracket.

If you wish to sublcass QCPSelectionDecoratorBracket in order to provide custom bracket shapes (see QCPSelectionDecoratorBracket::bsUserStyle), this is the method you should reimplement.

Definition at line 17262 of file qcustomplot.cpp.

◆ drawDecoration()

void QCPSelectionDecoratorBracket::drawDecoration ( QCPPainter painter,
QCPDataSelection  selection 

Draws the bracket decoration on the data points at the begin and end of each selected data segment given in seletion.

It uses the method drawBracket to actually draw the shapes.


Reimplemented from QCPSelectionDecorator.

Definition at line 17305 of file qcustomplot.cpp.

◆ getPixelCoordinates()

QPointF QCPSelectionDecoratorBracket::getPixelCoordinates ( const QCPPlottableInterface1D interface1d,
int  dataIndex 
) const

Returns the pixel coordinates of the data point at dataIndex, using interface1d to access the data points.

Definition at line 17404 of file qcustomplot.cpp.

◆ getTangentAngle()

double QCPSelectionDecoratorBracket::getTangentAngle ( const QCPPlottableInterface1D interface1d,
int  dataIndex,
int  direction 
) const

If setTangentToData is enabled, brackets need to be rotated according to the data slope. This method returns the angle in radians by which a bracket at the given dataIndex must be rotated.

The parameter direction must be set to either -1 or 1, representing whether it is an opening or closing bracket. Since for slope calculation multiple data points are required, this defines the direction in which the algorithm walks, starting at dataIndex, to average those data points. (see setTangentToData and setTangentAverage)

interface1d is the interface to the plottable's data which is used to query data coordinates.

Definition at line 17357 of file qcustomplot.cpp.

◆ setBracketBrush()

void QCPSelectionDecoratorBracket::setBracketBrush ( const QBrush brush)

Sets the brush that will be used to draw the brackets at the beginning and end of each selected data segment.

Definition at line 17187 of file qcustomplot.cpp.

◆ setBracketHeight()

void QCPSelectionDecoratorBracket::setBracketHeight ( int  height)

Sets the height of the drawn bracket. The height dimension is always perpendicular to the key axis of the data, or the tangent direction of the current data slope, if setTangentToData is enabled.

Definition at line 17207 of file qcustomplot.cpp.

◆ setBracketPen()

void QCPSelectionDecoratorBracket::setBracketPen ( const QPen pen)

Sets the pen that will be used to draw the brackets at the beginning and end of each selected data segment.

Definition at line 17178 of file qcustomplot.cpp.

◆ setBracketStyle()

void QCPSelectionDecoratorBracket::setBracketStyle ( QCPSelectionDecoratorBracket::BracketStyle  style)

Sets the shape that the bracket/marker will have.

See also
setBracketWidth, setBracketHeight

Definition at line 17217 of file qcustomplot.cpp.

◆ setBracketWidth()

void QCPSelectionDecoratorBracket::setBracketWidth ( int  width)

Sets the width of the drawn bracket. The width dimension is always parallel to the key axis of the data, or the tangent direction of the current data slope, if setTangentToData is enabled.

Definition at line 17197 of file qcustomplot.cpp.

◆ setTangentAverage()

void QCPSelectionDecoratorBracket::setTangentAverage ( int  pointCount)

Controls over how many data points the slope shall be averaged, when brackets shall be aligned with the data (if setTangentToData is true).

From the position of the bracket, pointCount points towards the selected data range will be taken into account. The smallest value of pointCount is 1, which is effectively equivalent to disabling setTangentToData.

Definition at line 17242 of file qcustomplot.cpp.

◆ setTangentToData()

void QCPSelectionDecoratorBracket::setTangentToData ( bool  enabled)

Sets whether the brackets will be rotated such that they align with the slope of the data at the position that they appear in.

For noisy data, it might be more visually appealing to average the slope over multiple data points. This can be configured via setTangentAverage.

Definition at line 17229 of file qcustomplot.cpp.

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