QwtPolarCurve - Man Page
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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