QwtPolarCurve - An item, that represents a series of points.

NAME

QwtPolarCurve − An item, that represents a series of points.

SYNOPSIS

#include <qwt_polar_curve.h>

Inherits QwtPolarItem.

Public Types

enum CurveStyle { NoCurve, Lines, UserCurve = 100 }
enum LegendAttribute { LegendShowLine = 0x01, LegendShowSymbol = 0x02 }
Attributes how to represent the curve on the legend.
typedef QFlags< LegendAttribute > LegendAttributes

Public Types inherited from QwtPolarItem

enum RttiValues { Rtti_PolarItem = 0, Rtti_PolarGrid, Rtti_PolarMarker, Rtti_PolarCurve, Rtti_PolarSpectrogram, Rtti_PolarUserItem = 1000 }
Runtime type information.
enum ItemAttribute { Legend = 0x01, AutoScale = 0x02 }
Plot Item Attributes.
enum RenderHint { RenderAntialiased = 0x01 }
Render hints.
typedef QFlags< ItemAttribute > ItemAttributes
typedef QFlags< RenderHint > RenderHints

Public Member Functions

QwtPolarCurve ()
Constructor.
QwtPolarCurve (const QwtText &title)
QwtPolarCurve (const QString &title)
virtual ˜QwtPolarCurve ()
Destructor.
virtual int rtti () const override
void setLegendAttribute (LegendAttribute, bool on=true)
bool testLegendAttribute (LegendAttribute) const
Test if a legend attribute is enabled.
void setData (QwtSeriesData< QwtPointPolar > *data)
const QwtSeriesData< QwtPointPolar > * data () const
size_t dataSize () const
QwtPointPolar sample (int i) const
void setPen (const QPen &)
Assign a pen.
const QPen & pen () const
void setStyle (CurveStyle style)
CurveStyle style () const
void setSymbol (QwtSymbol *)
Assign a symbol.
const QwtSymbol * symbol () const
void setCurveFitter (QwtCurveFitter *)
Insert a curve fitter.
QwtCurveFitter * curveFitter () const
virtual void draw (QPainter *p, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, double radius, const QRectF &canvasRect) const override
virtual void draw (QPainter *p, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, int from, int to) const
Draw an interval of the curve.
virtual QwtInterval boundingInterval (int scaleId) const override
virtual QwtGraphic legendIcon (int index, const QSizeF &) const override

Public Member Functions inherited from QwtPolarItem

QwtPolarItem (const QwtText &title=QwtText())
virtual ˜QwtPolarItem ()
Destroy the QwtPolarItem.
void attach (QwtPolarPlot *plot)
Attach the item to a plot.
void detach ()
This method detaches a QwtPolarItem from the QwtPolarPlot it has been associated with.
QwtPolarPlot * plot () const
void setTitle (const QString &title)
void setTitle (const QwtText &title)
const QwtText & title () const
void setItemAttribute (ItemAttribute, bool on=true)
bool testItemAttribute (ItemAttribute) const
void setRenderHint (RenderHint, bool on=true)
bool testRenderHint (RenderHint) const
void setRenderThreadCount (uint numThreads)
uint renderThreadCount () const
double z () const
void setZ (double z)
Set the z value.
void show ()
Show the item.
void hide ()
Hide the item.
virtual void setVisible (bool)
bool isVisible () const
virtual void itemChanged ()
virtual void legendChanged ()
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &, const QwtInterval &)
Update the item to changes of the axes scale division.
virtual int marginHint () const
void setLegendIconSize (const QSize &)
QSize legendIconSize () const
virtual QList< QwtLegendData > legendData () const
Return all information, that is needed to represent the item on the legend.

Protected Member Functions

void init ()
Initialize data members.
virtual void drawCurve (QPainter *, int style, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, int from, int to) const
virtual void drawSymbols (QPainter *, const QwtSymbol &, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, int from, int to) const
void drawLines (QPainter *, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, int from, int to) const

Detailed Description

An item, that represents a series of points.

A curve is the representation of a series of points in polar coordinates. The points are connected to the curve using the abstract QwtData interface.

See also

QwtPolarPlot, QwtSymbol, QwtScaleMap

Definition at line 30 of file qwt_polar_curve.h.

Member Typedef Documentation

typedef QFlags<LegendAttribute > QwtPolarCurve::LegendAttributes

An ORed combination of LegendAttribute values.

Definition at line 75 of file qwt_polar_curve.h.

Member Enumeration Documentation

enum QwtPolarCurve::CurveStyle

Curve styles.

See also

setStyle(), style()

Enumerator
NoCurve

Don’t draw a curve. Note: This doesn’t affect the symbols.

Lines

Connect the points with straight lines. The lines might be interpolated depending on the ’Fitted’ attribute. Curve fitting can be configured using setCurveFitter().

UserCurve

Values > 100 are reserved for user specific curve styles.

Definition at line 37 of file qwt_polar_curve.h.

enum QwtPolarCurve::LegendAttribute

Attributes how to represent the curve on the legend. If none of the flags is activated QwtPlotCurve tries to find a color representing the curve and paints a rectangle with it. In the default setting all attributes are off.

See also

setLegendAttribute(), testLegendAttribute()

Enumerator
LegendShowLine

If the curveStyle() is not NoCurve a line is painted with the curvePen().

LegendShowSymbol

If the curve has a valid symbol it is painted.

Definition at line 63 of file qwt_polar_curve.h.

Constructor & Destructor Documentation

QwtPolarCurve::QwtPolarCurve () [explicit]

Constructor.

Definition at line 66 of file qwt_polar_curve.cpp.

QwtPolarCurve::QwtPolarCurve (const QwtText & title) [explicit]

Constructor

Parameters

title title of the curve

Definition at line 76 of file qwt_polar_curve.cpp.

QwtPolarCurve::QwtPolarCurve (const QString & title) [explicit]

Constructor

Parameters

title title of the curve

Definition at line 86 of file qwt_polar_curve.cpp.

QwtPolarCurve::˜QwtPolarCurve () [virtual]

Destructor.

Definition at line 93 of file qwt_polar_curve.cpp.

Member Function Documentation

QwtInterval QwtPolarCurve::boundingInterval (int scaleId) const [override],[virtual]

Interval, that is necessary to display the item This interval can be useful for operations like clipping or autoscaling

Parameters

scaleId Scale index

Returns

bounding interval

See also

QwtData::boundingRect()

Reimplemented from QwtPolarItem.

Definition at line 585 of file qwt_polar_curve.cpp.

QwtCurveFitter * QwtPolarCurve::curveFitter () const

Returns

The curve fitter

See also

setCurveFitter()

Definition at line 261 of file qwt_polar_curve.cpp.

const QwtSeriesData< QwtPointPolar > * QwtPolarCurve::data () const[inline]

Returns

the the curve data

Definition at line 144 of file qwt_polar_curve.h.

size_t QwtPolarCurve::dataSize () const

Returns

Number of points

See also

setData()

Definition at line 499 of file qwt_polar_curve.cpp.

void QwtPolarCurve::draw (QPainter * painter, const QwtScaleMap &azimuthMap, const QwtScaleMap & radialMap, const QPointF & pole, doubleradius, const QRectF & canvasRect) const [override], [virtual]

Draw the curve

Parameters

painter Painter
azimuthMap Maps azimuth values to values related to 0.0, M_2PI
radialMap Maps radius values into painter coordinates.
pole Position of the pole in painter coordinates
radius Radius of the complete plot area in painter coordinates
canvasRect Contents rect of the canvas in painter coordinates

Implements QwtPolarItem.

Definition at line 276 of file qwt_polar_curve.cpp.

void QwtPolarCurve::draw (QPainter * painter, const QwtScaleMap &azimuthMap, const QwtScaleMap & radialMap, const QPointF & pole, intfrom, int to) const [virtual]

Draw an interval of the curve.

Parameters

painter Painter
azimuthMap Maps azimuth values to values related to 0.0, M_2PI
radialMap Maps radius values into painter coordinates.
pole Position of the pole in painter coordinates
from index of the first point to be painted
to index of the last point to be painted. If to < 0 the curve will be painted to its last point.

See also

drawCurve(), drawSymbols(),

Definition at line 299 of file qwt_polar_curve.cpp.

void QwtPolarCurve::drawCurve (QPainter * painter, int style, constQwtScaleMap & azimuthMap, const QwtScaleMap & radialMap, const QPointF& pole, int from, int to) const [protected], [virtual]

Draw the line part (without symbols) of a curve interval.

Parameters

painter Painter
style Curve style, see QwtPolarCurve::CurveStyle
azimuthMap Maps azimuth values to values related to 0.0, M_2PI
radialMap Maps radius values into painter coordinates.
pole Position of the pole in painter coordinates
from index of the first point to be painted
to index of the last point to be painted.

See also

draw(), drawLines()

Definition at line 341 of file qwt_polar_curve.cpp.

void QwtPolarCurve::drawLines (QPainter * painter, const QwtScaleMap &azimuthMap, const QwtScaleMap & radialMap, const QPointF & pole, intfrom, int to) const [protected]

Draw lines

Parameters

painter Painter
azimuthMap Maps azimuth values to values related to 0.0, M_2PI
radialMap Maps radius values into painter coordinates.
pole Position of the pole in painter coordinates
from index of the first point to be painted
to index of the last point to be painted.

See also

draw(), drawLines(), setCurveFitter()

Definition at line 367 of file qwt_polar_curve.cpp.

void QwtPolarCurve::drawSymbols (QPainter * painter, const QwtSymbol &symbol, const QwtScaleMap & azimuthMap, const QwtScaleMap & radialMap,const QPointF & pole, int from, int to) const [protected], [virtual]

Draw symbols

Parameters

painter Painter
symbol Curve symbol
azimuthMap Maps azimuth values to values related to 0.0, M_2PI
radialMap Maps radius values into painter coordinates.
pole Position of the pole in painter coordinates
from index of the first point to be painted
to index of the last point to be painted.

See also

setSymbol(), draw(), drawCurve()

Definition at line 459 of file qwt_polar_curve.cpp.

void QwtPolarCurve::init () [protected]

Initialize data members.

Definition at line 100 of file qwt_polar_curve.cpp.

QwtGraphic QwtPolarCurve::legendIcon (int index, const QSizeF & size) const[override], [virtual]

Returns

Icon representing the curve on the legend

Parameters

index Index of the legend entry ( ignored as there is only one )
size Icon size

See also

QwtPolarItem::setLegendIconSize(), QwtPolarItem::legendData()

Reimplemented from QwtPolarItem.

Definition at line 513 of file qwt_polar_curve.cpp.

const QPen & QwtPolarCurve::pen () const

Returns

Pen used to draw the lines

See also

setPen()

Definition at line 212 of file qwt_polar_curve.cpp.

int QwtPolarCurve::rtti () const [override], [virtual]

Returns

QwtPolarCurve::Rtti_PolarCurve

Reimplemented from QwtPolarItem.

Definition at line 113 of file qwt_polar_curve.cpp.

QwtPointPolar QwtPolarCurve::sample (int i) const [inline]

Parameters

i index

Returns

point at position i

Definition at line 153 of file qwt_polar_curve.h.

void QwtPolarCurve::setCurveFitter (QwtCurveFitter * curveFitter)

Insert a curve fitter.

Parameters

curveFitter Curve fitter

A curve fitter interpolates the curve points. F.e QwtPolarFitter adds equidistant points so that the connection gets rounded instead of having straight lines. If curveFitter is NULL fitting is disabled.

See also

curveFitter()

Definition at line 246 of file qwt_polar_curve.cpp.

void QwtPolarCurve::setData (QwtSeriesData< QwtPointPolar > * data)

Initialize data with a pointer to QwtSeriesData<QwtPointPolar>.

The x-values of the data object represent the azimuth, the y-value represents the radius.

Parameters

data Data

Definition at line 225 of file qwt_polar_curve.cpp.

void QwtPolarCurve::setLegendAttribute (LegendAttribute attribute, bool on= true)

Specify an attribute how to draw the legend identifier

Parameters

attribute Attribute
on On/Off /sa LegendAttribute, testLegendAttribute()

Definition at line 125 of file qwt_polar_curve.cpp.

void QwtPolarCurve::setPen (const QPen & pen)

Assign a pen.

Parameters

pen New pen

See also

pen()

Definition at line 199 of file qwt_polar_curve.cpp.

void QwtPolarCurve::setStyle (CurveStyle style)

Set the curve’s drawing style

Parameters

style Curve style

See also

CurveStyle, style()

Definition at line 152 of file qwt_polar_curve.cpp.

void QwtPolarCurve::setSymbol (QwtSymbol * symbol)

Assign a symbol.

Parameters

symbol Symbol

See also

symbol()

Definition at line 175 of file qwt_polar_curve.cpp.

QwtPolarCurve::CurveStyle QwtPolarCurve::style () const

Returns

Current style

See also

CurveStyle, setStyle()

Definition at line 165 of file qwt_polar_curve.cpp.

const QwtSymbol * QwtPolarCurve::symbol () const

Returns

The current symbol

See also

setSymbol()

Definition at line 189 of file qwt_polar_curve.cpp.

bool QwtPolarCurve::testLegendAttribute (LegendAttribute attribute) const

Test if a legend attribute is enabled.

Parameters

attribute Legend attribute

Returns

True if attribute is enabled

See also

LegendAttribute, setLegendAttribute()

Definition at line 141 of file qwt_polar_curve.cpp.

Author

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Updated 2026-06-01 - jenkler.se | uex.se