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, 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

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Info

Mon Jun 13 2016 Version 6.1.3 Qwt User's Guide