Qwt User's Guide  6.1.3
QwtPlotIntervalCurve Class Reference

QwtPlotIntervalCurve represents a series of samples, where each value is associated with an interval ( $[y1,y2] = f(x)$ ). More...

#include <qwt_plot_intervalcurve.h>

Inheritance diagram for QwtPlotIntervalCurve:

Public Types

enum  CurveStyle { NoCurve, Tube, UserCurve = 100 }
 Curve styles. The default setting is QwtPlotIntervalCurve::Tube. More...
 
enum  PaintAttribute { ClipPolygons = 0x01, ClipSymbol = 0x02 }
 
typedef QFlags< PaintAttributePaintAttributes
 Paint attributes.
 
- Public Types inherited from QwtPlotItem
enum  RttiValues {
  Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotLegend,
  Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve,
  Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotTradingCurve,
  Rtti_PlotBarChart, Rtti_PlotMultiBarChart, Rtti_PlotShape, Rtti_PlotTextLabel,
  Rtti_PlotZone, Rtti_PlotUserItem = 1000
}
 Runtime type information. More...
 
enum  ItemAttribute { Legend = 0x01, AutoScale = 0x02, Margins = 0x04 }
 Plot Item Attributes. More...
 
enum  ItemInterest { ScaleInterest = 0x01, LegendInterest = 0x02 }
 Plot Item Interests. More...
 
enum  RenderHint { RenderAntialiased = 0x1 }
 Render hints. More...
 
typedef QFlags< ItemAttributeItemAttributes
 Plot Item Attributes.
 
typedef QFlags< ItemInterestItemInterests
 Plot Item Interests.
 
typedef QFlags< RenderHintRenderHints
 Render hints.
 

Public Member Functions

 QwtPlotIntervalCurve (const QString &title=QString::null)
 
 QwtPlotIntervalCurve (const QwtText &title)
 
virtual ~QwtPlotIntervalCurve ()
 Destructor.
 
virtual int rtti () const
 
void setPaintAttribute (PaintAttribute, bool on=true)
 
bool testPaintAttribute (PaintAttribute) const
 
void setSamples (const QVector< QwtIntervalSample > &)
 
void setSamples (QwtSeriesData< QwtIntervalSample > *)
 
void setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
 
void setPen (const QPen &)
 Assign a pen. More...
 
const QPen & pen () const
 
void setBrush (const QBrush &)
 
const QBrush & brush () const
 
void setStyle (CurveStyle style)
 
CurveStyle style () const
 
void setSymbol (const QwtIntervalSymbol *)
 
const QwtIntervalSymbolsymbol () const
 
virtual void drawSeries (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
 
virtual QRectF boundingRect () const
 
virtual QwtGraphic legendIcon (int index, const QSizeF &) const
 
- Public Member Functions inherited from QwtPlotSeriesItem
 QwtPlotSeriesItem (const QString &title=QString::null)
 
 QwtPlotSeriesItem (const QwtText &title)
 
virtual ~QwtPlotSeriesItem ()
 Destructor.
 
void setOrientation (Qt::Orientation)
 
Qt::Orientation orientation () const
 
virtual void draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
 Draw the complete series. More...
 
virtual void updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
 Update the item to changes of the axes scale division. More...
 
- Public Member Functions inherited from QwtPlotItem
 QwtPlotItem (const QwtText &title=QwtText())
 
virtual ~QwtPlotItem ()
 Destroy the QwtPlotItem.
 
void attach (QwtPlot *plot)
 Attach the item to a plot. More...
 
void detach ()
 This method detaches a QwtPlotItem from any QwtPlot it has been associated with. More...
 
QwtPlotplot () const
 Return attached plot.
 
void setTitle (const QString &title)
 
void setTitle (const QwtText &title)
 
const QwtTexttitle () const
 
void setItemAttribute (ItemAttribute, bool on=true)
 
bool testItemAttribute (ItemAttribute) const
 
void setItemInterest (ItemInterest, bool on=true)
 
bool testItemInterest (ItemInterest) const
 
void setRenderHint (RenderHint, bool on=true)
 
bool testRenderHint (RenderHint) const
 
void setRenderThreadCount (uint numThreads)
 
uint renderThreadCount () const
 
void setLegendIconSize (const QSize &)
 
QSize legendIconSize () const
 
double z () const
 
void setZ (double z)
 Set the z value. More...
 
void show ()
 Show the item.
 
void hide ()
 Hide the item.
 
virtual void setVisible (bool)
 
bool isVisible () const
 
void setAxes (int xAxis, int yAxis)
 
void setXAxis (int axis)
 
int xAxis () const
 Return xAxis.
 
void setYAxis (int axis)
 
int yAxis () const
 Return yAxis.
 
virtual void itemChanged ()
 
virtual void legendChanged ()
 
virtual void getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasSize, double &left, double &top, double &right, double &bottom) const
 Calculate a hint for the canvas margin. More...
 
virtual void updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &)
 Update the item to changes of the legend info. More...
 
QRectF scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
 Calculate the bounding scale rectangle of 2 maps. More...
 
QRectF paintRect (const QwtScaleMap &, const QwtScaleMap &) const
 Calculate the bounding paint rectangle of 2 maps. More...
 
virtual QList< QwtLegendDatalegendData () const
 Return all information, that is needed to represent the item on the legend. More...
 
- Public Member Functions inherited from QwtSeriesStore< QwtIntervalSample >
 QwtSeriesStore ()
 Constructor The store contains no series.
 
 ~QwtSeriesStore ()
 Destructor.
 
void setData (QwtSeriesData< QwtIntervalSample > *series)
 
QwtSeriesData< QwtIntervalSample > * data ()
 
const QwtSeriesData< QwtIntervalSample > * data () const
 
QwtIntervalSample sample (int index) const
 
virtual size_t dataSize () const
 
virtual QRectF dataRect () const
 
virtual void setRectOfInterest (const QRectF &rect)
 
QwtSeriesData< QwtIntervalSample > * swapData (QwtSeriesData< QwtIntervalSample > *series)
 

Protected Member Functions

void init ()
 Initialize internal members.
 
virtual void drawTube (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
 
virtual void drawSymbols (QPainter *, const QwtIntervalSymbol &, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
 
- Protected Member Functions inherited from QwtPlotSeriesItem
virtual void dataChanged ()
 dataChanged() indicates, that the series has been changed.
 
- Protected Member Functions inherited from QwtPlotItem
QwtGraphic defaultIcon (const QBrush &, const QSizeF &) const
 Return a default icon from a brush. More...
 
- Protected Member Functions inherited from QwtAbstractSeriesStore
virtual ~QwtAbstractSeriesStore ()
 Destructor.
 

Detailed Description

QwtPlotIntervalCurve represents a series of samples, where each value is associated with an interval ( $[y1,y2] = f(x)$ ).

The representation depends on the style() and an optional symbol() that is displayed for each interval. QwtPlotIntervalCurve might be used to display error bars or the area between 2 curves.

Member Enumeration Documentation

Curve styles. The default setting is QwtPlotIntervalCurve::Tube.

See also
setStyle(), style()
Enumerator
NoCurve 

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

Tube 

Build 2 curves from the upper and lower limits of the intervals and draw them with the pen(). The area between the curves is filled with the brush().

UserCurve 

Styles >= QwtPlotIntervalCurve::UserCurve are reserved for derived classes that overload drawSeries() with additional application specific curve types.

Attributes to modify the drawing algorithm.

See also
setPaintAttribute(), testPaintAttribute()
Enumerator
ClipPolygons 

Clip polygons before painting them. In situations, where points are far outside the visible area (f.e when zooming deep) this might be a substantial improvement for the painting performance.

ClipSymbol 

Check if a symbol is on the plot canvas before painting it.

Constructor & Destructor Documentation

QwtPlotIntervalCurve::QwtPlotIntervalCurve ( const QString &  title = QString::null)
explicit

Constructor

Parameters
titleTitle of the curve
QwtPlotIntervalCurve::QwtPlotIntervalCurve ( const QwtText title)
explicit

Constructor

Parameters
titleTitle of the curve

Member Function Documentation

QRectF QwtPlotIntervalCurve::boundingRect ( ) const
virtual
Returns
Bounding rectangle of all samples. For an empty series the rectangle is invalid.

Reimplemented from QwtPlotSeriesItem.

const QBrush & QwtPlotIntervalCurve::brush ( ) const
Returns
Brush used to fill the area in Tube style()
See also
setBrush(), setStyle(), CurveStyle
void QwtPlotIntervalCurve::drawSeries ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const
virtual

Draw a subset of the samples

Parameters
painterPainter
xMapMaps x-values into pixel coordinates.
yMapMaps y-values into pixel coordinates.
canvasRectContents rectangle of the canvas
fromIndex of the first sample to be painted
toIndex of the last sample to be painted. If to < 0 the series will be painted to its last sample.
See also
drawTube(), drawSymbols()

Implements QwtPlotSeriesItem.

void QwtPlotIntervalCurve::drawSymbols ( QPainter *  painter,
const QwtIntervalSymbol symbol,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const
protectedvirtual

Draw symbols for a subset of the samples

Parameters
painterPainter
symbolInterval symbol
xMapx map
yMapy map
canvasRectContents rectangle of the canvas
fromIndex of the first sample to be painted
toIndex of the last sample to be painted
See also
setSymbol(), drawSeries(), drawTube()
void QwtPlotIntervalCurve::drawTube ( QPainter *  painter,
const QwtScaleMap xMap,
const QwtScaleMap yMap,
const QRectF &  canvasRect,
int  from,
int  to 
) const
protectedvirtual

Draw a tube

Builds 2 curves from the upper and lower limits of the intervals and draws them with the pen(). The area between the curves is filled with the brush().

Parameters
painterPainter
xMapMaps x-values into pixel coordinates.
yMapMaps y-values into pixel coordinates.
canvasRectContents rectangle of the canvas
fromIndex of the first sample to be painted
toIndex of the last sample to be painted. If to < 0 the series will be painted to its last sample.
See also
drawSeries(), drawSymbols()
QwtGraphic QwtPlotIntervalCurve::legendIcon ( int  index,
const QSizeF &  size 
) const
virtual
Returns
Icon for the legend

In case of Tube style() the icon is a plain rectangle filled with the brush(). If a symbol is assigned it is scaled to size.

Parameters
indexIndex of the legend entry ( ignored as there is only one )
sizeIcon size
See also
QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()

Reimplemented from QwtPlotItem.

const QPen & QwtPlotIntervalCurve::pen ( ) const
Returns
Pen used to draw the lines
See also
setPen(), brush()
int QwtPlotIntervalCurve::rtti ( ) const
virtual
void QwtPlotIntervalCurve::setBrush ( const QBrush &  brush)

Assign a brush.

The brush is used to fill the area in Tube style().

Parameters
brushBrush
See also
brush(), pen(), setStyle(), CurveStyle
void QwtPlotIntervalCurve::setPaintAttribute ( PaintAttribute  attribute,
bool  on = true 
)

Specify an attribute how to draw the curve

Parameters
attributePaint attribute
onOn/Off
See also
testPaintAttribute()
void QwtPlotIntervalCurve::setPen ( const QColor &  color,
qreal  width = 0.0,
Qt::PenStyle  style = Qt::SolidLine 
)

Build and assign a pen

In Qt5 the default pen width is 1.0 ( 0.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() ). This method has been introduced to hide this incompatibility.

Parameters
colorPen color
widthPen width
stylePen style
See also
pen(), brush()
void QwtPlotIntervalCurve::setPen ( const QPen &  pen)

Assign a pen.

Parameters
penNew pen
See also
pen(), brush()
void QwtPlotIntervalCurve::setSamples ( const QVector< QwtIntervalSample > &  samples)

Initialize data with an array of samples.

Parameters
samplesVector of samples
void QwtPlotIntervalCurve::setSamples ( QwtSeriesData< QwtIntervalSample > *  data)

Assign a series of samples

setSamples() is just a wrapper for setData() without any additional value - beside that it is easier to find for the developer.

Parameters
dataData
Warning
The item takes ownership of the data object, deleting it when its not used anymore.
void QwtPlotIntervalCurve::setStyle ( CurveStyle  style)

Set the curve's drawing style

Parameters
styleCurve style
See also
CurveStyle, style()
void QwtPlotIntervalCurve::setSymbol ( const QwtIntervalSymbol symbol)

Assign a symbol.

Parameters
symbolSymbol
See also
symbol()
QwtPlotIntervalCurve::CurveStyle QwtPlotIntervalCurve::style ( ) const
Returns
Style of the curve
See also
setStyle()
const QwtIntervalSymbol * QwtPlotIntervalCurve::symbol ( ) const
Returns
Current symbol or NULL, when no symbol has been assigned
See also
setSymbol()
bool QwtPlotIntervalCurve::testPaintAttribute ( PaintAttribute  attribute) const
Returns
True, when attribute is enabled
See also
PaintAttribute, setPaintAttribute()