Man page - qwtplotintervalcurve(3)

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Manual

QwtPlotIntervalCurve

NAME

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

SYNOPSIS

#include <qwt_plot_intervalcurve.h>

Inherits QwtPlotSeriesItem , and QwtSeriesStore< QwtIntervalSample > .

Public Types

enum CurveStyle { NoCurve , Tube , UserCurve = 100 }
Curve styles. The default setting is QwtPlotIntervalCurve::Tube .
enum PaintAttribute { ClipPolygons = 0x01, ClipSymbol = 0x02 }
typedef QFlags< PaintAttribute > PaintAttributes
Paint attributes.

Public Member Functions

QwtPlotIntervalCurve (const QString & title =QString())
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.
const QPen & pen () const
void setBrush (const QBrush &)
const QBrush & brush () const
void setStyle ( CurveStyle style )
CurveStyle style () const
void setSymbol (const QwtIntervalSymbol *)
const QwtIntervalSymbol * symbol () const
virtual void drawSeries (QPainter *, 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

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

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

enum QwtPlotIntervalCurve::CurveStyle

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.

enum QwtPlotIntervalCurve::PaintAttribute

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()) [explicit]

Constructor

Parameters:

title Title of the curve

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

Constructor

Parameters:

title Title 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, constQwtScaleMap & xMap, const QwtScaleMap & yMap, const QRectF &canvasRect, int from, int to) const [virtual]

Draw a subset of the samples

Parameters:

painter Painter
xMap Maps x-values into pixel coordinates.
yMap Maps y-values into pixel coordinates.
canvasRect Contents rectangle of the canvas
from Index of the first sample to be painted
to Index 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, constQwtIntervalSymbol & symbol, const QwtScaleMap & xMap, const QwtScaleMap& yMap, const QRectF & canvasRect, int from, int to) const [protected],[virtual]

Draw symbols for a subset of the samples

Parameters:

painter Painter
symbol Interval symbol
xMap x map
yMap y map
canvasRect Contents rectangle of the canvas
from Index of the first sample to be painted
to Index 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 [protected], [virtual]

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:

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:

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

Returns:

QwtPlotItem::Rtti_PlotIntervalCurve

Reimplemented from QwtPlotItem .

void QwtPlotIntervalCurve::setBrush (const QBrush & brush)

Assign a brush.

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

Parameters:

brush Brush

See also:

brush() , pen() , setStyle() , CurveStyle

void QwtPlotIntervalCurve::setPaintAttribute (PaintAttribute attribute,bool on = true)

Specify an attribute how to draw the curve

Parameters:

attribute Paint attribute
on On/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:

color Pen color
width Pen width
style Pen style

See also:

pen() , brush()

void QwtPlotIntervalCurve::setPen (const QPen & pen)

Assign a pen.

Parameters:

pen New pen

See also:

pen() , brush()

void QwtPlotIntervalCurve::setSamples (const QVector< QwtIntervalSample > &samples)

Initialize data with an array of samples.

Parameters:

samples Vector 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:

data Data

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:

style Curve style

See also:

CurveStyle , style()

void QwtPlotIntervalCurve::setSymbol (const QwtIntervalSymbol * symbol)

Assign a symbol.

Parameters:

symbol Symbol

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()

Author

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