JKQTPlotter trunk/v5.0.0
an extensive Qt5+Qt6 Plotter framework (including a feature-richt plotter widget, a speed-optimized, but limited variant and a LaTeX equation renderer!), written fully in C/C++ and without external dependencies
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This virtual JKQTPGraph descendent extends JKQTPXYGraph with two additional columns that encode for a vector starting at (x,y), i.e. either two distances along the x- and y-axis ( $ \Delta x, \Delta y $), or a rotation angle $ \alpha $ and a vector length $ \l $ . More...

#include <jkqtpgraphsbase.h>

Inheritance diagram for JKQTPXYAndVectorGraph:
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Collaboration diagram for JKQTPXYAndVectorGraph:
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Public Types

enum  VectorDataLayout {
  DeltaXDeltaYLayout ,
  AngleAndLengthLayout ,
  DefaultVectorDataLayout =DeltaXDeltaYLayout
}
 values from this enum indicates how to interpret the data columns provided to this graph More...
 
- Public Types inherited from JKQTPXYGraph
enum  DataSortOrder {
  Unsorted =0 ,
  SortedX =1 ,
  SortedY =2
}
 specifies how to sort the data in a JKQTPXYGraph before drawing More...
 
- Public Types inherited from JKQTPPlotElement
enum  HitTestMode {
  HitTestXY ,
  HitTestXOnly ,
  HitTestYOnly
}
 modes of operation for the function hitTest() More...
 

Public Slots

void setAngleAndLengthColumn (int colAngle, int colLength)
 det angleColumn and lengthColumn column at the same time! ALso ensures that vectorDataLayout is set accordingly.
 
void setAngleColumn (int col)
 the column that contains the rotation angle [in radian]
 
void setDxColumn (int col)
 the column that contains the delta along the x-axis.
 
void setDxDyColumn (int colDx, int colDy)
 det dxColumn and dyColumn column at the same time! ALso ensures that vectorDataLayout is set accordingly.
 
void setDyColumn (int col)
 the column that contains the delta along the y-axis.
 
void setLengthColumn (int col)
 the column that contains the vector length
 
- Public Slots inherited from JKQTPXYGraph
void setDataSortOrder (DataSortOrder __value)
 if !=Unsorted, the data is sorted before plotting
 
void setDataSortOrder (int __value)
 if !=Unsorted, the data is sorted before plotting
 
virtual void setKeyColumn (int __value)
 sets the column used as "key" for the current graph (typically this call setXColumn(), but for horizontal graphs like filled curves or barcharts it may call setYColumn() )
 
virtual void setValueColumn (int __value)
 sets the column used as "value" for the current graph (typically this call setXColumn(), but for horizontal graphs like filled curves or barcharts it may call setYColumn() )
 
void setXColumn (int __value)
 the column that contains the x-component of the datapoints
 
void setXColumn (size_t __value)
 the column that contains the x-component of the datapoints
 
void setXYColumns (int xCol, int yCol)
 sets xColumn and yColumn at the same time
 
void setXYColumns (QPair< int, int > xyColPair)
 sets xColumn and yColumn at the same time
 
void setXYColumns (QPair< size_t, size_t > xyColPair)
 sets xColumn and yColumn at the same time
 
void setXYColumns (size_t xCol, size_t yCol)
 sets xColumn and yColumn at the same time
 
void setYColumn (int __value)
 the column that contains the y-component of the datapoints
 
void setYColumn (size_t __value)
 the column that contains the y-component of the datapoints
 
- Public Slots inherited from JKQTPPlotElement
void setHighlighted (bool __value)
 sets whether the graph is drawn in a highlighted style in the plot

 
virtual void setTitle (const QString &__value)
 sets the title of the plot (for display in key!).
 
void setVisible (bool __value)
 sets whether the graph is visible in the plot

 

Public Member Functions

 JKQTPXYAndVectorGraph (JKQTBasePlotter *parent=nullptr)
 class constructor
 
virtual QString formatHitTestDefaultLabel (double x, double y, int index=-1, const JKQTPDatastore *datastore=nullptr) const override
 tool-function for hitTest(), which formats a default label, taking into account the x- and y-position (both provided) and optionally the errors of these positions.
 
int getAngleColumn () const
 the column that contains the rotation angle [in radian]
 
int getDxColumn () const
 the column that contains the delta along the x-axis.
 
int getDyColumn () const
 the column that contains the delta along the y-axis.
 
int getLengthColumn () const
 the column that contains the vector length
 
VectorDataLayout getVectorDataLayout () const
 indicates, which column pairs to use (dxColumn, dyColumn), (angleColumn, lengthColumn), ...
 
virtual bool getXMinMax (double &minx, double &maxx, double &smallestGreaterZero) override
 get the maximum and minimum x-value of the graph
 
virtual bool getYMinMax (double &miny, double &maxy, double &smallestGreaterZero) override
 get the maximum and minimum y-value of the graph
 
virtual double hitTest (const QPointF &posSystem, QPointF *closestSpotSystem=nullptr, QString *label=nullptr, HitTestMode mode=HitTestXY) const override
 Implmentation of JKQTPPlotElement::hitTest(), which searches through all graph points defined by xColumn and yColumn and returns a general x/y-label, also taking into account possibly known errors to the graphs (if it is derived from JKQTPXGraphErrorData and/or JKQTPYGraphErrorData.
 
virtual bool usesColumn (int column) const override
 returns true if the given column is used by the graph
 
- Public Member Functions inherited from JKQTPXYGraph
 JKQTPXYGraph (JKQTBasePlotter *parent=nullptr)
 class constructor
 
DataSortOrder getDataSortOrder () const
 if !=Unsorted, the data is sorted before plotting
 
virtual int getKeyColumn () const
 returns the column used as "key" for the current graph (typically this call getXColumn(), but for horizontal graphs like filled curves or barcharts it may call getYColumn() )
 
virtual int getValueColumn () const
 returns the column used as "value" for the current graph (typically this call getXColumn(), but for horizontal graphs like filled curves or barcharts it may call getYColumn() )
 
int getXColumn () const
 the column that contains the x-component of the datapoints
 
int getYColumn () const
 the column that contains the y-component of the datapoints
 
- Public Member Functions inherited from JKQTPGraph
 JKQTPGraph (JKQTBasePlotter *parent=nullptr)
 class constructor
 
virtual ~JKQTPGraph ()=default
 default wirtual destructor
 
- Public Member Functions inherited from JKQTPPlotElement
 JKQTPPlotElement (JKQTBasePlotter *parent=nullptr)
 class constructor
 
virtual ~JKQTPPlotElement ()=default
 default wirtual destructor
 
QPointF backTransform (const QPointF &x) const
 tool routine that back-transforms a QPointF according to the parent's transformation rules (pixels --> plot coordinate)
 
QPointF backTransform (double x, double y) const
 tool routine that back-transforms a QPointF according to the parent's transformation rules (pixels --> plot coordinate)
 
double backtransformX (double x) const
 tool routine that backtransforms an x-coordinate (pixels --> plot coordinate) for this plot element, uses the axis referenced in xAxisRef
 
double backtransformY (double y) const
 tool routine that backtransforms a y-coordinate (pixels --> plot coordinate) for this plot element, uses the axis referenced in yAxisRef
 
virtual void draw (JKQTPEnhancedPainter &painter)=0
 plots the graph to the plotter object specified as parent
 
virtual void drawKeyMarker (JKQTPEnhancedPainter &painter, const QRectF &rect)=0
 plots a key marker inside the specified rectangle rect
 
virtual void drawOutside (JKQTPEnhancedPainter &painter, QRect leftSpace, QRect rightSpace, QRect topSpace, QRect bottomSpace)
 plots outside the actual plot field of view (e.g. color bars, scale bars, ...)
 
QImage generateKeyMarker (QSize size=QSize(16, 16))
 returns an image with a key marker inside

 
virtual QColor getKeyLabelColor () const =0
 returns the color to be used for the key label
 
virtual void getOutsideSize (JKQTPEnhancedPainter &painter, int &leftSpace, int &rightSpace, int &topSpace, int &bottomSpace)
 if the graph plots outside the actual plot field of view (e.g. color bars, scale bars, ...)
 
JKQTBasePlottergetParent ()
 returns the parent painter class
 
const JKQTBasePlottergetParent () const
 returns the parent painter class
 
QString getTitle () const
 returns the the title of the plot

 
const JKQTPCoordinateAxisgetXAxis () const
 returns the actual x-Axis-object from the parent plotter, referenced in xAxisRef
 
JKQTPCoordinateAxisRef getXAxisRef () const
 indicates which coordinate axis to use for coordinate transforms in x-direction
 
const JKQTPCoordinateAxisgetYAxis () const
 returns the actual y-Axis-object from the parent plotter, referenced in yAxisRef
 
JKQTPCoordinateAxisRef getYAxisRef () const
 indicates which coordinate axis to use for coordinate transforms in y-direction
 
bool isHighlighted () const
 returns whether the graph is shown in a highlighted style in the plot

 
bool isVisible () const
 returns whether the graph is visible in the plot

 
void setAxes (JKQTPCoordinateAxisRef ref)
 set the coordinate axes to use for this plot element
 
virtual void setParent (JKQTBasePlotter *parent)
 sets the parent painter class
 
virtual void setParent (JKQTPlotter *parent)
 sets the parent painter class
 
void setXAxis (JKQTPCoordinateAxisRef ref)
 indicates which coordinate axis to use for coordinate transforms in x-direction
 
void setYAxis (JKQTPCoordinateAxisRef ref)
 indicates which coordinate axis to use for coordinate transforms in y-direction
 
QPointF transform (const QPointF &x) const
 tool routine that transforms a QPointF according to the parent's transformation rules (plot coordinate --> pixels)
 
QPolygonF transform (const QPolygonF &x) const
 tool routine that transforms a QPolygonF according to the parent's transformation rules (plot coordinate --> pixels)
 
QPointF transform (double x, double y) const
 tool routine that transforms a QPointF according to the parent's transformation rules (plot coordinate --> pixels)
 
QPainterPath transformToLinePath (const QPolygonF &x) const
 tool routine that transforms a QPolygonF according to the parent's transformation rules and returns a (non-closed) path consisting of lines (plot coordinate --> pixels)
 
QVector< double > transformX (const QVector< double > &x) const
 transform all x-coordinates in a vector x
 
double transformX (double x) const
 tool routine that transforms an x-coordinate (plot coordinate --> pixels) for this plot element, uses the axis referenced in xAxisRef
 
QVector< double > transformY (const QVector< double > &x) const
 transform all y-coordinates in a vector x
 
double transformY (double y) const
 tool routine that transforms a y-coordinate (plot coordinate --> pixels) for this plot element, uses the axis referenced in yAxisRef
 

Protected Member Functions

virtual bool getIndexRange (int &imin, int &imax) const override
 determines the range of row indexes available in the data columns of this graph
 
double getVectorAngle (int i) const
 
QPointF getVectorDxDy (int i) const
 this function interprets vectorDataLayout together with (dxColumn, dyColumn) or (angleColumn, lengthColumn) or ... and returns the i -th vectors $ \Delta x, \Delta y $
 
double getVectorMagnitude (int i) const
 
- Protected Member Functions inherited from JKQTPXYGraph
int getDataIndex (int i) const
 returns the index of the i-th datapoint (where i is an index into the SORTED datapoints)
 
virtual void intSortData ()
 sorts data according to the specified criterion in sortData ... The result is stored as a index-map in sorted Indices
 
- Protected Member Functions inherited from JKQTPGraph
virtual void drawErrorsAfter (JKQTPEnhancedPainter &)
 this function is used to plot error inidcators after plotting the graphs.
 
virtual void drawErrorsBefore (JKQTPEnhancedPainter &)
 this function is used to plot error inidcators before plotting the graphs.
 
bool getDataMinMax (int column, double &minx, double &maxx, double &smallestGreaterZero)
 get the maximum and minimum value of the given column
 
- Protected Member Functions inherited from JKQTPPlotElement
void addHitTestData (const HitTestLocation &loc)
 clear the internal datastore for hitTest()
 
void addHitTestData (const QPointF &pos_, const QString &label_)
 clear the internal datastore for hitTest()
 
void addHitTestData (const QPointF &pos_, int index_, const QString &label_)
 clear the internal datastore for hitTest()
 
void addHitTestData (const QPointF &pos_, int index_=-1, const JKQTPDatastore *datastore=nullptr)
 clear the internal datastore for hitTest(), this variant uses formatHitTestDefaultLabel() to auto-generate the label
 
void addHitTestData (double x_, double y_, const QString &label_)
 add a new point on the graph to the internal datastore for hitTest()
 
void addHitTestData (double x_, double y_, int index_, const QString &label_)
 clear the internal datastore for hitTest()
 
void addHitTestData (double x_, double y_, int index_=-1, const JKQTPDatastore *datastore=nullptr)
 add a new point on the graph to the internal datastore for hitTest(), this variant uses formatHitTestDefaultLabel() to auto-generate the label
 
void clearHitTestData ()
 clear the internal datastore for hitTest()
 
void reserveHitTestData (int points)
 reserve list entries for up to points graph points in the internal datastore for hitTest()
 
QString xFloatToString (double v, int past_comma=-1) const
 converts a x-value v into a string, taking into account the type of x-axis
 
QString yFloatToString (double v, int past_comma=-1) const
 converts a x-value v into a string, taking into account the type of x-axis
 

Static Protected Member Functions

static double getVectorAngle (const QPointF &v)
 calculates the rotation angle (3 o'clock is 0) in radians $ [0...2\pi] $ of a vector v
 
static double getVectorMagnitude (const QPointF &v)
 calculates the magnitude/length of a vector v
 

Properties

int angleColumn
 the column that contains the rotation angle [in radian]
 
int dxColumn
 the column that contains the delta along the x-axis.
 
int dyColumn
 the column that contains the delta along the y-axis.
 
int lengthColumn
 the column that contains the vector length
 
VectorDataLayout vectorDataLayout
 indicates, which column pairs to use (dxColumn, dyColumn), (angleColumn, lengthColumn), ...
 
- Properties inherited from JKQTPXYGraph
DataSortOrder sortData
 if !=Unsorted, the data is sorted before plotting
 
int xColumn
 the column that contains the x-component of the datapoints
 
int yColumn
 the column that contains the y-component of the datapoints
 
- Properties inherited from JKQTPPlotElement
bool highlighted
 indicates whether the graph is shown in a "highlghted" in the plot
 
QString title
 title of the plot (for display in key!). If no title is supplied, no key entry is drawn.
 
bool visible
 indicates whether the graph is visible in the plot
 
JKQTPCoordinateAxisRef xAxisRef
 indicates which coordinate axis to use for coordinate transforms in x-direction
 
JKQTPCoordinateAxisRef yAxisRef
 indicates which coordinate axis to use for coordinate transforms in y-direction
 

Additional Inherited Members

- Protected Attributes inherited from JKQTPXYGraph
QVector< int > sortedIndices
 this array contains the order of indices, in which to access the data in the data columns
 
- Protected Attributes inherited from JKQTPPlotElement
QVector< HitTestLocationm_hitTestData
 dataset with graph-points and associated data from the function hitTest()
 
JKQTBasePlotterparent
 the plotter object this object belongs to
 
int parentPlotStyle
 internal storage for the used parent plot style
 

Detailed Description

This virtual JKQTPGraph descendent extends JKQTPXYGraph with two additional columns that encode for a vector starting at (x,y), i.e. either two distances along the x- and y-axis ( $ \Delta x, \Delta y $), or a rotation angle $ \alpha $ and a vector length $ \l $ .

See also
JKQTPVectorFieldGraph, JKQTPParametrizedVectorFieldGraph

Member Enumeration Documentation

◆ VectorDataLayout

values from this enum indicates how to interpret the data columns provided to this graph

Enumerator
DeltaXDeltaYLayout 

Data is given in the form of two vector components (along x- and y-axis)

AngleAndLengthLayout 

Data is given in the form of an angle and a length that describe the vector together.

DefaultVectorDataLayout 

Constructor & Destructor Documentation

◆ JKQTPXYAndVectorGraph()

JKQTPXYAndVectorGraph::JKQTPXYAndVectorGraph ( JKQTBasePlotter parent = nullptr)

class constructor

Member Function Documentation

◆ formatHitTestDefaultLabel()

virtual QString JKQTPXYAndVectorGraph::formatHitTestDefaultLabel ( double  x,
double  y,
int  index = -1,
const JKQTPDatastore datastore = nullptr 
) const
overridevirtual

tool-function for hitTest(), which formats a default label, taking into account the x- and y-position (both provided) and optionally the errors of these positions.

Parameters
xx-position of the datapoint in system coordinates
yy-position of the datapoint in system coordinates
indexthe index of the data point in the associated data column(s), or -1 (optional!)
datastoreThe datastore to read error data from (optional!)
Returns
a LaTeX formatted label

Reimplemented from JKQTPPlotElement.

◆ getAngleColumn()

int JKQTPXYAndVectorGraph::getAngleColumn ( ) const

the column that contains the rotation angle [in radian]

An angle of 0 means a right-pointing vector and angle is measured count-clockwise, so angle $ \alpha $ and length $ l $ can be converted to $ \Delta x, \Delta y $ via:

\[ \Delta x = l\cdot \cos\alpha \]

\[ \Delta y = l\cdot \sin\alpha \]

Note that these calculations are performed in the coordinate-axis-space, NOT in screen pixel space!

Note
Note that this column is only used, when vectorDataLayout is set accordingly to AngleAndLengthLayout! Also note that Setter-functions (e.g. setAngleColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setAngleColumn(), setLengthColumn(), getAngleColumn(), getLengthColumn()

◆ getDxColumn()

int JKQTPXYAndVectorGraph::getDxColumn ( ) const

the column that contains the delta along the x-axis.

Note
Note that this column is only used, when vectorDataLayout is set accordingly to DeltaXDeltaYLayout! Also note that Setter-functions (e.g. setDxColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setDxColumn(), setDyColumn(), setDxDyColumn(), getDxColumn(), getDyColumn()

◆ getDyColumn()

int JKQTPXYAndVectorGraph::getDyColumn ( ) const

the column that contains the delta along the y-axis.

Note
Note that this column is only used, when vectorDataLayout is set accordingly to DeltaXDeltaYLayout! Also note that Setter-functions (e.g. setDyColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setDxColumn(), setDyColumn(), setDxDyColumn(), getDxColumn(), getDyColumn()

◆ getIndexRange()

virtual bool JKQTPXYAndVectorGraph::getIndexRange ( int &  imin,
int &  imax 
) const
overrideprotectedvirtual

determines the range of row indexes available in the data columns of this graph

Parameters
[out]iminfirst usable row-index
[out]imaxlast usable row-index
Returns
true on success and false if the information is not available

Reimplemented from JKQTPXYGraph.

◆ getLengthColumn()

int JKQTPXYAndVectorGraph::getLengthColumn ( ) const

the column that contains the vector length

An angle of 0 means a right-pointing vector and angle is measured count-clockwise, so angle $ \alpha $ and length $ l $ can be converted to $ \Delta x, \Delta y $ via:

\[ \Delta x = l\cdot \cos\alpha \]

\[ \Delta y = l\cdot \sin\alpha \]

Note that these calculations are performed in the coordinate-axis-space, NOT in screen pixel space!

Note
Note that this column is only used, when vectorDataLayout is set accordingly to AngleAndLengthLayout! Also note that Setter-functions (e.g. setAngleColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setAngleColumn(), setLengthColumn(), getAngleColumn(), getLengthColumn()

◆ getVectorAngle() [1/2]

static double JKQTPXYAndVectorGraph::getVectorAngle ( const QPointF &  v)
inlinestaticprotected

calculates the rotation angle (3 o'clock is 0) in radians $ [0...2\pi] $ of a vector v

◆ getVectorAngle() [2/2]

double JKQTPXYAndVectorGraph::getVectorAngle ( int  i) const
inlineprotected

◆ getVectorDataLayout()

VectorDataLayout JKQTPXYAndVectorGraph::getVectorDataLayout ( ) const

indicates, which column pairs to use (dxColumn, dyColumn), (angleColumn, lengthColumn), ...

◆ getVectorDxDy()

QPointF JKQTPXYAndVectorGraph::getVectorDxDy ( int  i) const
protected

this function interprets vectorDataLayout together with (dxColumn, dyColumn) or (angleColumn, lengthColumn) or ... and returns the i -th vectors $ \Delta x, \Delta y $

◆ getVectorMagnitude() [1/2]

static double JKQTPXYAndVectorGraph::getVectorMagnitude ( const QPointF &  v)
inlinestaticprotected

calculates the magnitude/length of a vector v

◆ getVectorMagnitude() [2/2]

double JKQTPXYAndVectorGraph::getVectorMagnitude ( int  i) const
inlineprotected

◆ getXMinMax()

virtual bool JKQTPXYAndVectorGraph::getXMinMax ( double &  minx,
double &  maxx,
double &  smallestGreaterZero 
)
overridevirtual

get the maximum and minimum x-value of the graph

The result is given in the two parameters which are call-by-reference parameters!

Parameters
[out]minxminimal x-value used in the graph
[out]maxxmaximal x-value used in the graph
[out]smallestGreaterZerothe smalles x-value in the graph, which is larger than 0 (this is used in auto-sizing for logarithmic axes)
Returns
true on success, i.e. if there were datapoints in the plot, or false on failure (e.g. when the graph is empty)

Reimplemented from JKQTPXYGraph.

◆ getYMinMax()

virtual bool JKQTPXYAndVectorGraph::getYMinMax ( double &  miny,
double &  maxy,
double &  smallestGreaterZero 
)
overridevirtual

get the maximum and minimum y-value of the graph

The result is given in the two parameters which are call-by-reference parameters!

Parameters
[out]minyminimal y-value used in the graph
[out]maxymaximal y-value used in the graph
[out]smallestGreaterZerothe smalles y-value in the graph, which is larger than 0 (this is used in auto-sizing for logarithmic axes)
Returns
true on success, i.e. if there were datapoints in the plot, or false on failure (e.g. when the graph is empty)

Reimplemented from JKQTPXYGraph.

◆ hitTest()

virtual double JKQTPXYAndVectorGraph::hitTest ( const QPointF &  posSystem,
QPointF *  closestSpotSystem = nullptr,
QString *  label = nullptr,
HitTestMode  mode = HitTestXY 
) const
overridevirtual

Implmentation of JKQTPPlotElement::hitTest(), which searches through all graph points defined by xColumn and yColumn and returns a general x/y-label, also taking into account possibly known errors to the graphs (if it is derived from JKQTPXGraphErrorData and/or JKQTPYGraphErrorData.

Note
This function first checks whether JKQTPPlotElement::hitTest() returns any result, so you can use the basic implementation in JKQTPPlotElement to override the behaviour here, by simply calling addHitTestData() during your draw() implementation
See also
See JKQTPPlotElement::hitTest() for details on the function definition!

Reimplemented from JKQTPXYGraph.

◆ setAngleAndLengthColumn

void JKQTPXYAndVectorGraph::setAngleAndLengthColumn ( int  colAngle,
int  colLength 
)
slot

det angleColumn and lengthColumn column at the same time! ALso ensures that vectorDataLayout is set accordingly.

See also
angleColumn, lengthColumn

◆ setAngleColumn

void JKQTPXYAndVectorGraph::setAngleColumn ( int  col)
slot

the column that contains the rotation angle [in radian]

An angle of 0 means a right-pointing vector and angle is measured count-clockwise, so angle $ \alpha $ and length $ l $ can be converted to $ \Delta x, \Delta y $ via:

\[ \Delta x = l\cdot \cos\alpha \]

\[ \Delta y = l\cdot \sin\alpha \]

Note that these calculations are performed in the coordinate-axis-space, NOT in screen pixel space!

Note
Note that this column is only used, when vectorDataLayout is set accordingly to AngleAndLengthLayout! Also note that Setter-functions (e.g. setAngleColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setAngleColumn(), setLengthColumn(), getAngleColumn(), getLengthColumn()

◆ setDxColumn

void JKQTPXYAndVectorGraph::setDxColumn ( int  col)
slot

the column that contains the delta along the x-axis.

Note
Note that this column is only used, when vectorDataLayout is set accordingly to DeltaXDeltaYLayout! Also note that Setter-functions (e.g. setDxColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setDxColumn(), setDyColumn(), setDxDyColumn(), getDxColumn(), getDyColumn()

◆ setDxDyColumn

void JKQTPXYAndVectorGraph::setDxDyColumn ( int  colDx,
int  colDy 
)
slot

det dxColumn and dyColumn column at the same time! ALso ensures that vectorDataLayout is set accordingly.

See also
dxColumn, dyColumn

◆ setDyColumn

void JKQTPXYAndVectorGraph::setDyColumn ( int  col)
slot

the column that contains the delta along the y-axis.

Note
Note that this column is only used, when vectorDataLayout is set accordingly to DeltaXDeltaYLayout! Also note that Setter-functions (e.g. setDyColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setDxColumn(), setDyColumn(), setDxDyColumn(), getDxColumn(), getDyColumn()

◆ setLengthColumn

void JKQTPXYAndVectorGraph::setLengthColumn ( int  col)
slot

the column that contains the vector length

An angle of 0 means a right-pointing vector and angle is measured count-clockwise, so angle $ \alpha $ and length $ l $ can be converted to $ \Delta x, \Delta y $ via:

\[ \Delta x = l\cdot \cos\alpha \]

\[ \Delta y = l\cdot \sin\alpha \]

Note that these calculations are performed in the coordinate-axis-space, NOT in screen pixel space!

Note
Note that this column is only used, when vectorDataLayout is set accordingly to AngleAndLengthLayout! Also note that Setter-functions (e.g. setAngleColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setAngleColumn(), setLengthColumn(), getAngleColumn(), getLengthColumn()

◆ usesColumn()

virtual bool JKQTPXYAndVectorGraph::usesColumn ( int  column) const
overridevirtual

returns true if the given column is used by the graph

This virtual function indicates whether a given column is used by this graph. Override this function in your derived graphs to indicate to JKQTPlotter / JKQTBasePlotter , which columns from the internal JKQTPDatastore are actually used. This information can be used e.g. for graph-specific data-export.

Reimplemented from JKQTPXYGraph.

Reimplemented in JKQTPParametrizedVectorFieldGraph.

Property Documentation

◆ angleColumn

int JKQTPXYAndVectorGraph::angleColumn
readwrite

the column that contains the rotation angle [in radian]

An angle of 0 means a right-pointing vector and angle is measured count-clockwise, so angle $ \alpha $ and length $ l $ can be converted to $ \Delta x, \Delta y $ via:

\[ \Delta x = l\cdot \cos\alpha \]

\[ \Delta y = l\cdot \sin\alpha \]

Note that these calculations are performed in the coordinate-axis-space, NOT in screen pixel space!

Note
Note that this column is only used, when vectorDataLayout is set accordingly to AngleAndLengthLayout! Also note that Setter-functions (e.g. setAngleColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setAngleColumn(), setLengthColumn(), getAngleColumn(), getLengthColumn()

◆ dxColumn

int JKQTPXYAndVectorGraph::dxColumn
readwrite

the column that contains the delta along the x-axis.

Note
Note that this column is only used, when vectorDataLayout is set accordingly to DeltaXDeltaYLayout! Also note that Setter-functions (e.g. setDxColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setDxColumn(), setDyColumn(), setDxDyColumn(), getDxColumn(), getDyColumn()

◆ dyColumn

int JKQTPXYAndVectorGraph::dyColumn
readwrite

the column that contains the delta along the y-axis.

Note
Note that this column is only used, when vectorDataLayout is set accordingly to DeltaXDeltaYLayout! Also note that Setter-functions (e.g. setDyColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setDxColumn(), setDyColumn(), setDxDyColumn(), getDxColumn(), getDyColumn()

◆ lengthColumn

int JKQTPXYAndVectorGraph::lengthColumn
readwrite

the column that contains the vector length

An angle of 0 means a right-pointing vector and angle is measured count-clockwise, so angle $ \alpha $ and length $ l $ can be converted to $ \Delta x, \Delta y $ via:

\[ \Delta x = l\cdot \cos\alpha \]

\[ \Delta y = l\cdot \sin\alpha \]

Note that these calculations are performed in the coordinate-axis-space, NOT in screen pixel space!

Note
Note that this column is only used, when vectorDataLayout is set accordingly to AngleAndLengthLayout! Also note that Setter-functions (e.g. setAngleColumn() ) will ensure that vectorDataLayout is set accordingly.
See also
setAngleColumn(), setLengthColumn(), getAngleColumn(), getLengthColumn()

◆ vectorDataLayout

VectorDataLayout JKQTPXYAndVectorGraph::vectorDataLayout
read

indicates, which column pairs to use (dxColumn, dyColumn), (angleColumn, lengthColumn), ...


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