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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