Provided by: libqwt-doc_6.1.4-2_all 
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, 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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