QwtPlotIntervalCurve - Man Page

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, const QwtScaleMap & 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, const QwtIntervalSymbol & 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

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

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

Generated automatically by Doxygen for Qwt User's Guide from the source code.

Info

Mon Jun 1 2020 Version 6.1.5 Qwt User's Guide