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 JKQTPGeometricPlotElement is used to draw a bezier curve. More...

#include <jkqtpgeolines.h>

Inheritance diagram for JKQTPGeoBezierCurve:
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Collaboration diagram for JKQTPGeoBezierCurve:
[legend]

Public Member Functions

 JKQTPGeoBezierCurve (JKQTBasePlotter *parent)
 class constructor
 
 JKQTPGeoBezierCurve (JKQTBasePlotter *parent, const QPointF &start, const QPointF &control1, const QPointF &control2, const QPointF &end)
 class constructor with start, end and two control points (i.e. a cubic bezier curve)
 
 JKQTPGeoBezierCurve (JKQTBasePlotter *parent, const QPointF &start, const QPointF &control1, const QPointF &end)
 class constructor with start, end and one control point (i.e. a quadratic bezier curve)
 
 JKQTPGeoBezierCurve (JKQTPlotter *parent)
 class constructor
 
 JKQTPGeoBezierCurve (JKQTPlotter *parent, const QPointF &start, const QPointF &control1, const QPointF &control2, const QPointF &end)
 class constructor with start, end and two control points (i.e. a cubic bezier curve)
 
 JKQTPGeoBezierCurve (JKQTPlotter *parent, const QPointF &start, const QPointF &control1, const QPointF &end)
 class constructor with start, end and one control point (i.e. a quadratic bezier curve)
 
virtual void draw (JKQTPEnhancedPainter &painter) override
 plots the graph to the plotter object specified as parent
 
QPointF getControl1 () const
 get the control point 1 of the curve
 
QPointF getControl2 () const
 get the control point 2 of the curve
 
int getDegree () const
 get the degree of the curve (number of points -1)
 
QPointF getEnd () const
 get the end point of the curve
 
int getNumberOfCOntrolPoints () const
 get the number of control points (including start and end)
 
QVector< QPointF > getPoints () const
 list with all control points of the bezier curve
 
QPointF getStart () const
 get the start point of the curve
 
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
 
void setCubic (const QPointF &start, const QPointF &control1, const QPointF &control2, const QPointF &end)
 set a cubic bezier curve (4 control points)
 
void setLine (const QPointF &start, const QPointF &end)
 set a linear bezier curve (2 control points)
 
void setPoints (const QVector< QPointF > &__value)
 list with all control points of the bezier curve
 
void setQuad (const QPointF &start, const QPointF &control1, const QPointF &end)
 set a quadratic bezier curve (3 control points)
 
void setQuartic (const QPointF &start, const QPointF &control1, const QPointF &control2, const QPointF &control3, const QPointF &end)
 set a cubic bezier curve (5 control points)
 
- Public Member Functions inherited from JKQTPGeoBaseDecoratedLine
 JKQTPGeoBaseDecoratedLine (JKQTBasePlotter *parent, DrawMode drawMode=DrawAsGraphicElement)
 class contructor
 
 JKQTPGeoBaseDecoratedLine (JKQTPLineDecoratorStyle headStyle, JKQTPLineDecoratorStyle tailStyle, JKQTBasePlotter *parent, DrawMode drawMode=DrawAsGraphicElement)
 class contructor
 
virtual void drawKeyMarker (JKQTPEnhancedPainter &painter, const QRectF &rect) override
 plots a key marker inside the specified rectangle rect
 
virtual QColor getKeyLabelColor () const override
 returns the color to be used for the key label
 
virtual void setAlpha (float alpha)
 sets the alpha-channel of the color (i.e. its transparency)
 
virtual void setColor (QColor c)
 set line color
 
virtual void setStyle (QColor color, double lineWidth)
 set several of the style properties with one call
 
virtual void setStyle (QColor color, double lineWidth, Qt::PenStyle style)
 set several of the style properties with one call
 
virtual void setStyle (QColor color, Qt::PenStyle style)
 set several of the style properties with one call
 
- Public Member Functions inherited from JKQTPGeometricPlotElement
 JKQTPGeometricPlotElement (DrawMode drawMode=DrawAsGraphicElement, JKQTBasePlotter *parent=nullptr)
 class constructor
 
virtual ~JKQTPGeometricPlotElement ()
 default wirtual destructor
 
DrawMode getDrawMode () const
 indicated whether to draw lines as graphic elements (even on non-linear coordinate systems), or as mathematically correct curves
 
- 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 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 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
 
virtual double hitTest (const QPointF &posSystem, QPointF *closestSpotSystem=nullptr, QString *label=nullptr, HitTestMode mode=HitTestXY) const
 returns the closest distance of the plot element to the (screen pixel) position pos, or NAN
 
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
 
- Public Member Functions inherited from JKQTPGraphDecoratedLineStyleMixin
 JKQTPGraphDecoratedLineStyleMixin ()
 class constructor
 
virtual ~JKQTPGraphDecoratedLineStyleMixin ()
 
double calcHeadDecoratorSize (double line_width) const
 calculates the tail decorator size from the line width line_width, using m_headDecoratorSizeFactor and a non-linear scaling function
 
double calcTailDecoratorSize (double line_width) const
 calculates the tail decorator size from the line width line_width, using m_tailDecoratorSizeFactor and a non-linear scaling function
 
double getHeadDecoratorSizeFactor () const
 head decorator size-factor, used to calculate the size of the arrow from the line width
 
JKQTPLineDecoratorStyle getHeadDecoratorStyle () const
 get the head decorator style
 
double getTailDecoratorSizeFactor () const
 tail decorator size-factor, used to calculate the size of the arrow from the line width
 
JKQTPLineDecoratorStyle getTailDecoratorStyle () const
 get the tail decorator style
 
void initDecoratedLineStyle (JKQTBasePlotter *parent, int &parentPlotStyle, JKQTPPlotStyleType styletype=JKQTPPlotStyleType::Default)
 initiaize the line style (from the parent plotter)
 
void setHeadDecoratorSizeFactor (const double &__value)
 head decorator size-factor, used to calculate the size of the arrow from the line width
 
void setHeadDecoratorStyle (const JKQTPLineDecoratorStyle &__value)
 set the head decorator style
 
void setTailDecoratorSizeFactor (const double &__value)
 tail decorator size-factor, used to calculate the size of the arrow from the line width
 
void setTailDecoratorStyle (const JKQTPLineDecoratorStyle &__value)
 set the tail decorator style
 
- Public Member Functions inherited from JKQTPGraphLineStyleMixin
 JKQTPGraphLineStyleMixin ()
 class constructor
 
virtual ~JKQTPGraphLineStyleMixin ()
 
QColor getHighlightingLineColor () const
 get the color of the graph line when highlighted
 
QPen getHighlightingLinePen (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
 constructs a QPen from the line styling properties
 
QPen getHighlightingLinePenForRects (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
 constructs a QPen from the line styling properties, suitable for drawing rectangle with sharp corners
 
QPen getKeyLinePen (JKQTPEnhancedPainter &painter, const QRectF &rect, JKQTBasePlotter *parent) const
 constructs a QPen from the line styling properties, but uses getKeyLineWidthPx() for the width, i.e. constructs a pen for drawing lines in key-symbols
 
double getKeyLineWidthPx (JKQTPEnhancedPainter &painter, const QRectF &keyRect, const JKQTBasePlotter *parent) const
 returns the linewidth for drawing lines in a key entry with keyRect for the symbol, using painter and parent .
 
QBrush getLineBrush () const
 gets the brush used to fill the line area
 
Qt::PenCapStyle getLineCapStyle () const
 gets the cap style
 
QColor getLineColor () const
 get the color of the graph line
 
qreal getLineDashOffset () const
 returns the dash offset for a custom dash style
 
QVector< qreal > getLineDashPattern () const
 gets the dash pattern for a custom dash style
 
Qt::PenJoinStyle getLineJoinStyle () const
 returns the join style
 
QPen getLinePen (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
 constructs a QPen from the line styling properties
 
QPen getLinePenForRects (JKQTPEnhancedPainter &painter, JKQTBasePlotter *parent) const
 constructs a QPen from the line styling properties, suitable for drawing rectangles with sharp edges
 
Qt::PenStyle getLineStyle () const
 get the style of the graph line
 
double getLineWidth () const
 get the line width of the graph line (in pt)
 
void initLineStyle (JKQTBasePlotter *parent, int &parentPlotStyle, JKQTPPlotStyleType styletype=JKQTPPlotStyleType::Default)
 initiaize the line style (from the parent plotter)
 
void setHighlightingLineColor (const QColor &__value)
 set the color of the graph line when highlighted
 
void setHighlightingLineColor (const QColor &__value, double alpha)
 set the color of the graph line when highlighted
 
void setLineBrush (const QBrush &style)
 sets the brush used to fill the line area
 
void setLineCapStyle (Qt::PenCapStyle style)
 sets the cap style
 
void setLineColor (const QColor &__value)
 set the color of the graph line
 
void setLineColor (const QColor &__value, double alpha)
 set the color of the graph line
 
void setLineColorInvertedFrom (QColor __noninvertedColor)
 sets the line-color as an inverted version of the given color
 
void setLineDashOffset (qreal offset)
 sets the dash offset for a custom dash style
 
void setLineDashPattern (const QVector< qreal > &pattern)
 sets the dash pattern for a custom dash style
 
void setLineJoinStyle (Qt::PenJoinStyle style)
 sets the join style
 
void setLineStyle (Qt::PenStyle __value)
 set the style of the graph line
 
void setLineWidth (double __value)
 set the line width of the graph line (in pt)
 

Protected Attributes

QVector< QPointF > points
 list with all control points of the bezier curve
 
- Protected Attributes inherited from JKQTPGeometricPlotElement
DrawMode m_drawMode
 indicated whether to draw lines as graphic elements (even on non-linear coordinate systems), or as mathematically correct curves
 
- 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
 

Additional Inherited Members

- Public Types inherited from JKQTPGeometricPlotElement
enum  DrawMode {
  DrawAsGraphicElement ,
  DrawAsMathematicalCurve
}
 indicates how to draw the geometric object More...
 
- Public Types inherited from JKQTPPlotElement
enum  HitTestMode {
  HitTestXY ,
  HitTestXOnly ,
  HitTestYOnly
}
 modes of operation for the function hitTest() More...
 
- Public Slots inherited from JKQTPGeometricPlotElement
void setDrawMode (DrawMode mode)
 indicated whether to draw lines as graphic elements (even on non-linear coordinate systems), or as mathematically correct curves
 
- 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

 
- 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()
 
virtual QString formatHitTestDefaultLabel (double x, double y, int index=-1, const JKQTPDatastore *datastore=nullptr) const
 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.
 
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
 
- Properties inherited from JKQTPGeometricPlotElement
DrawMode drawMode
 
- 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
 
- Properties inherited from JKQTPGraphDecoratedLineStyleMixin
double headDecoratorSizeFactor
 
JKQTPLineDecoratorStyle headDecoratorStyle
 
double tailDecoratorSizeFactor
 
JKQTPLineDecoratorStyle tailDecoratorStyle
 
- Properties inherited from JKQTPGraphLineStyleMixin
QColor highlightingLineColor
 
QColor lineColor
 
Qt::PenStyle lineStyle
 
double lineWidth
 

Detailed Description

This JKQTPGeometricPlotElement is used to draw a bezier curve.

drawn with JKQTPGeometricPlotElement::DrawMode::DrawAsGraphicElement
See also
Example (JKQTPlotter): Plotting Bezier Curves, JKQTPGeoBaseDecoratedLine

DrawMode for JKQTPGeoBezierCurve

This class support JKQTPGeometricPlotElement::DrawMode::DrawAsMathematicalCurve , which will only have a significant effect with logarithmic axes. THe image above is the default JKQTPGeometricPlotElement::DrawMode::DrawAsGraphicElement on a linear axis.

On logarithmic axes (x&y) the two modes draw very different shapes:

drawn with JKQTPGeometricPlotElement::DrawMode::DrawAsMathematicalCurve
drawn with JKQTPGeometricPlotElement::DrawMode::DrawAsGraphicElement

For DrawAsGraphicElement only the control points are converted to screen-coordinates, but drawing takes place in the (linear) screen-system. For DrawAsMathematicalCurve drawing is done in the log-coordinate system.

Line-End Decorators for JKQTPGeoBezierCurve

You can also activate line-end decorators (aka arrows) for this poly-line, by using code like this:

bezier->setHeadDecoratorStyle(JKQTPFilledDoubleArrow);
bezier->setTailDecoratorStyle(JKQTPCircleDecorator);
@ JKQTPCircleDecorator
an open circle tip
Definition jkqtpdrawingtools.h:375
@ JKQTPFilledDoubleArrow
a nice filled double-arrow tip
Definition jkqtpdrawingtools.h:374
See also
Example (JKQTPlotter): Plotting Bezier Curves

Constructor & Destructor Documentation

◆ JKQTPGeoBezierCurve() [1/6]

JKQTPGeoBezierCurve::JKQTPGeoBezierCurve ( JKQTBasePlotter parent,
const QPointF &  start,
const QPointF &  control1,
const QPointF &  end 
)

class constructor with start, end and one control point (i.e. a quadratic bezier curve)

\param parent the parent plotter object
\param start start point
\param control1 control-point in between start and end
\param end end point

◆ JKQTPGeoBezierCurve() [2/6]

JKQTPGeoBezierCurve::JKQTPGeoBezierCurve ( JKQTPlotter parent,
const QPointF &  start,
const QPointF &  control1,
const QPointF &  end 
)

class constructor with start, end and one control point (i.e. a quadratic bezier curve)

\param parent the parent plotter object
\param start start point
\param control1 control-point in between start and end
\param end end point

◆ JKQTPGeoBezierCurve() [3/6]

JKQTPGeoBezierCurve::JKQTPGeoBezierCurve ( JKQTBasePlotter parent,
const QPointF &  start,
const QPointF &  control1,
const QPointF &  control2,
const QPointF &  end 
)

class constructor with start, end and two control points (i.e. a cubic bezier curve)

\param parent the parent plotter object
\param start start point
\param control1 1st control-point in between start and end
\param control2 2nd control-point in between start and end
\param end end point

◆ JKQTPGeoBezierCurve() [4/6]

JKQTPGeoBezierCurve::JKQTPGeoBezierCurve ( JKQTPlotter parent,
const QPointF &  start,
const QPointF &  control1,
const QPointF &  control2,
const QPointF &  end 
)

class constructor with start, end and two control points (i.e. a cubic bezier curve)

\param parent the parent plotter object
\param start start point
\param control1 1st control-point in between start and end
\param control2 2nd control-point in between start and end
\param end end point

◆ JKQTPGeoBezierCurve() [5/6]

JKQTPGeoBezierCurve::JKQTPGeoBezierCurve ( JKQTBasePlotter parent)

class constructor

\param parent the parent plotter object

◆ JKQTPGeoBezierCurve() [6/6]

JKQTPGeoBezierCurve::JKQTPGeoBezierCurve ( JKQTPlotter parent)

class constructor

\param parent the parent plotter object

Member Function Documentation

◆ draw()

virtual void JKQTPGeoBezierCurve::draw ( JKQTPEnhancedPainter painter)
overridevirtual

plots the graph to the plotter object specified as parent

Note
This function support JKQTPGeometricPlotElement::DrawMode::DrawAsMathematicalCurve. If set, and non-linear axes are chosen, the points of the poly-line will be possibly connected by curves, instead of straight lines. In the mode JKQTPGeometricPlotElement::DrawMode::DrawAsGraphicElement the points are connected by straight lines, independent of the linearity or non-linearity of the coordinate axes.

Implements JKQTPPlotElement.

◆ getControl1()

QPointF JKQTPGeoBezierCurve::getControl1 ( ) const

get the control point 1 of the curve

◆ getControl2()

QPointF JKQTPGeoBezierCurve::getControl2 ( ) const

get the control point 2 of the curve

◆ getDegree()

int JKQTPGeoBezierCurve::getDegree ( ) const

get the degree of the curve (number of points -1)

◆ getEnd()

QPointF JKQTPGeoBezierCurve::getEnd ( ) const

get the end point of the curve

◆ getNumberOfCOntrolPoints()

int JKQTPGeoBezierCurve::getNumberOfCOntrolPoints ( ) const

get the number of control points (including start and end)

◆ getPoints()

QVector< QPointF > JKQTPGeoBezierCurve::getPoints ( ) const

list with all control points of the bezier curve

Note
This class supports at most 4 points are alllowed

◆ getStart()

QPointF JKQTPGeoBezierCurve::getStart ( ) const

get the start point of the curve

◆ getXMinMax()

virtual bool JKQTPGeoBezierCurve::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)

Implements JKQTPPlotElement.

◆ getYMinMax()

virtual bool JKQTPGeoBezierCurve::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)

Implements JKQTPPlotElement.

◆ setCubic()

void JKQTPGeoBezierCurve::setCubic ( const QPointF &  start,
const QPointF &  control1,
const QPointF &  control2,
const QPointF &  end 
)

set a cubic bezier curve (4 control points)

◆ setLine()

void JKQTPGeoBezierCurve::setLine ( const QPointF &  start,
const QPointF &  end 
)

set a linear bezier curve (2 control points)

◆ setPoints()

void JKQTPGeoBezierCurve::setPoints ( const QVector< QPointF > &  __value)

list with all control points of the bezier curve

Note
This class supports at most 4 points are alllowed

◆ setQuad()

void JKQTPGeoBezierCurve::setQuad ( const QPointF &  start,
const QPointF &  control1,
const QPointF &  end 
)

set a quadratic bezier curve (3 control points)

◆ setQuartic()

void JKQTPGeoBezierCurve::setQuartic ( const QPointF &  start,
const QPointF &  control1,
const QPointF &  control2,
const QPointF &  control3,
const QPointF &  end 
)

set a cubic bezier curve (5 control points)

Member Data Documentation

◆ points

QVector<QPointF> JKQTPGeoBezierCurve::points
protected

list with all control points of the bezier curve

Note
This class supports at most 4 points are alllowed

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