QwtPolarCurve(3)               Qwt User's Guide               QwtPolarCurve(3)

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 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

   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 (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.

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, double
       radius, 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, int
       from, 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, const
       QwtScaleMap & 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, int
       from, 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.

   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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Version 6.2.0                   Sun Jul 18 2021               QwtPolarCurve(3)