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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< QwtIntervalSample >.

   Public Types
       enum CurveStyle { NoCurve, Tube, UserCurve =  100 }
       enum PaintAttribute { ClipPolygons =  0x01, ClipSymbol =  0x02 }
       typedef QFlags< PaintAttribute > PaintAttributes

   Public Member Functions
       QwtPlotIntervalCurve (const QString &title=QString::null)
       QwtPlotIntervalCurve (const QwtText &title)
       virtual ~QwtPlotIntervalCurve ()
       virtual int rtti () const
       void setPaintAttribute (PaintAttribute, bool on=true)
       bool testPaintAttribute (PaintAttribute) const
       void setSamples (const QVector< QwtIntervalSample > &)
       void setPen (const QPen &)
       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 void drawLegendIdentifier (QPainter *, const QRectF &) const

   Protected Member Functions
       void init ()
       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 disply error bars or the area between
       2 curves.

Member Typedef Documentation

   typedef QFlags<PaintAttribute> QwtPlotIntervalCurve::PaintAttributes
       Paint attributes.

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

   QwtPlotIntervalCurve::~QwtPlotIntervalCurve () [virtual]
       Destructor.

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< QwtIntervalSample >.

   const QBrush & QwtPlotIntervalCurve::brush () const Returns:
           Brush used to fill the area in Tube style()

       See also:
           setBrush(), setStyle(), CurveStyle

   void QwtPlotIntervalCurve::drawLegendIdentifier (QPainter *painter, const QRectF &rect) const
       [virtual] In case of Tibe stale() a plain rectangle is painted without a pen filled the
       brush(). If a symbol is assigned it is painted cebtered into rect.
       Parameters:
           painter Painter
           rect Bounding rectangle for the identifier

       Reimplemented from QwtLegendItemManager.

   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 rect 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 QwtPlotAbstractSeriesItem.

   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 rect 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 rect 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()

   void QwtPlotIntervalCurve::init () [protected]
       Initialize internal members.

   const QPen & QwtPlotIntervalCurve::pen () const
       Return the 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 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::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
       Return the current style. 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
       Return the current paint attributes. See also:
           PaintAttribute, setPaintAttribute()

Author

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