QwtPlotIntervalCurve(3)

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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