QwtPlotIntervalCurve man page

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::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.
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 *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

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::null) [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, intfrom, intto) 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, intfrom, intto) 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, intfrom, intto) 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 (intindex, 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 (PaintAttributeattribute, boolon = 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, qrealwidth = 0.0, Qt::PenStylestyle = 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 (CurveStylestyle)

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 (PaintAttributeattribute) const

Returns:

True, when attribute is enabled

See Also:

PaintAttribute, setPaintAttribute()

Author

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Info

Thu Dec 11 2014 Version 6.1.2 Qwt User's Guide