# QwtPlotIntervalCurve Class Reference

QwtPlotIntervalCurve represents a series of samples, where each value is associated with an interval ( ). More...

`#include <qwt_plot_intervalcurve.h>`

Inheritance diagram for QwtPlotIntervalCurve:
[legend]

List of all members.

## Public Types

enum | CurveStyle { NoCurve, Tube, UserCurve = 100 }
enum | ItemAttribute { Legend = 0x01, AutoScale = 0x02 }
typedef QFlags< ItemAttribute > | ItemAttributes
enum | PaintAttribute { ClipPolygons = 0x01, ClipSymbol = 0x02 }
typedef QFlags< PaintAttribute > | PaintAttributes
enum | RenderHint { RenderAntialiased = 1 }
typedef QFlags< RenderHint > | RenderHints
enum | RttiValues { Rtti_PlotItem = 0, Rtti_PlotGrid, Rtti_PlotScale, Rtti_PlotMarker, Rtti_PlotCurve, Rtti_PlotSpectroCurve, Rtti_PlotIntervalCurve, Rtti_PlotHistogram, Rtti_PlotSpectrogram, Rtti_PlotSVG, Rtti_PlotUserItem = 1000 }

## Public Member Functions

void | attach (QwtPlot *plot)
virtual QRectF | boundingRect () const
const QBrush & | brush () const
QwtSeriesData < QwtIntervalSample > * | data ()
const QwtSeriesData < QwtIntervalSample > * | data () const
size_t | dataSize () const
void | detach ()
virtual void | draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &) const
virtual void | drawLegendIdentifier (QPainter *, const QRectF &) const
virtual void | drawSeries (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void | hide ()
bool | isVisible () const
virtual void | itemChanged ()
virtual QWidget * | legendItem () const
Qt::Orientation | orientation () const
QRectF | paintRect (const QwtScaleMap &, const QwtScaleMap &) const
const QPen & | pen () const
QwtPlot * | plot () const
| QwtPlotIntervalCurve (const QwtText &title)
| QwtPlotIntervalCurve (const QString &title=QString::null)
virtual int | rtti () const
QwtIntervalSample | sample (int index) const
QRectF | scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
void | setAxes (int xAxis, int yAxis)
void | setBrush (const QBrush &)
void | setData (QwtSeriesData< QwtIntervalSample > *)
void | setItemAttribute (ItemAttribute, bool on=true)
void | setOrientation (Qt::Orientation)
void | setPaintAttribute (PaintAttribute, bool on=true)
void | setPen (const QPen &)
void | setRenderHint (RenderHint, bool on=true)
void | setSamples (const QVector< QwtIntervalSample > &)
void | setStyle (CurveStyle style)
void | setSymbol (const QwtIntervalSymbol *)
void | setTitle (const QwtText &title)
void | setTitle (const QString &title)
virtual void | setVisible (bool)
void | setXAxis (int axis)
void | setYAxis (int axis)
void | setZ (double z)
void | show ()
CurveStyle | style () const
const QwtIntervalSymbol * | symbol () const
bool | testItemAttribute (ItemAttribute) const
bool | testPaintAttribute (PaintAttribute) const
bool | testRenderHint (RenderHint) const
const QwtText & | title () const
virtual void | updateLegend (QwtLegend *) const
virtual void | updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &)
int | xAxis () const
int | yAxis () const
double | z () const
virtual | ~QwtPlotIntervalCurve ()

## Protected Member Functions

virtual void | drawSymbols (QPainter *, const QwtIntervalSymbol &, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
virtual void | drawTube (QPainter *, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, int from, int to) const
void | init ()

## Protected Attributes

QwtSeriesData < QwtIntervalSample > * | d_series

## Detailed Description

QwtPlotIntervalCurve represents a series of samples, where each value is associated with an interval ( ).

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<ItemAttribute> QwtPlotItem::ItemAttributes`[inherited]`

Plot Item Attributes.

typedef QFlags<PaintAttribute> QwtPlotIntervalCurve::PaintAttributes

Paint attributes.

typedef QFlags<RenderHint> QwtPlotItem::RenderHints`[inherited]`

Render hints.

## 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 QwtPlotItem::ItemAttribute`[inherited]`

Plot Item Attributes

See also:
  setItemAttribute(), testItemAttribute()

Enumerator:

  Legend | The item is represented on the legend.
  AutoScale | The boundingRect() of the item is included in the autoscaling calculation.

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.

enum QwtPlotItem::RenderHint`[inherited]`

Render hints.

Enumerator:

  RenderAntialiased | Enable antialiasing.

enum QwtPlotItem::RttiValues`[inherited]`

Runtime type information.

RttiValues is used to cast plot items, without having to enable runtime type information of the compiler.

## 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

void QwtPlotItem::attach | ( | QwtPlot * | plot | ) | `[inherited]`

Attach the item to a plot.

This method will attach a QwtPlotItem to the QwtPlot argument. It will first detach the QwtPlotItem from any plot from a previous call to attach (if necessary). If a NULL argument is passed, it will detach from any QwtPlot it was attached to.

Parameters:

  plot | Plot widget

See also:
  detach()

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 QwtPlotItem::detach | ( |  | ) | `[inherited]`

This method detaches a QwtPlotItem from any QwtPlot it has been associated with.

detach() is equivalent to calling attach( NULL )

See also:
  attach()

void QwtPlotAbstractSeriesItem::draw | ( | QPainter * | painter,
|  | const QwtScaleMap & | xMap,
|  | const QwtScaleMap & | yMap,
|  | const QRectF & | canvasRect
| ) |  | const`[virtual, inherited]`

Draw the complete series.

Parameters:

  painter | Painter
  xMap | Maps x-values into pixel coordinates.
  yMap | Maps y-values into pixel coordinates.
  canvasRect | Contents rect of the canvas

Implements QwtPlotItem.

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,
|  | 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 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,
|  | 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 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,
|  | 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 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 QwtPlotItem::hide | ( |  | ) | `[inherited]`

Hide the item.

void QwtPlotIntervalCurve::init | ( |  | ) | `[protected]`

Initialize internal members.

bool QwtPlotItem::isVisible | ( |  | ) | const`[inherited]`

Returns:
  true if visible

See also:
  setVisible(), show(), hide()

void QwtPlotItem::itemChanged | ( |  | ) | `[virtual, inherited]`

Update the legend and call QwtPlot::autoRefresh for the parent plot.

See also:
  updateLegend()

QWidget * QwtPlotItem::legendItem | ( |  | ) | const`[virtual, inherited]`

Allocate the widget that represents the item on the legend.

The default implementation returns a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().

Returns:
  QwtLegendItem()

See also:
  updateLegend() QwtLegend()

Implements QwtLegendItemManager.

Qt::Orientation QwtPlotAbstractSeriesItem::orientation | ( |  | ) | const`[inherited]`

Returns:
  Orientation of the plot item

See also:
  setOrientation()

QRectF QwtPlotItem::paintRect | ( | const QwtScaleMap & | xMap,
|  | const QwtScaleMap & | yMap
| ) |  | const`[inherited]`

Calculate the bounding paint rect of 2 maps.

Parameters:

  xMap | X map
  yMap | X map

Returns:
  Bounding paint rect of the scale maps, normalized

const QPen & QwtPlotIntervalCurve::pen | ( |  | ) | const

Return the pen used to draw the lines.

See also:
  setPen(), brush()

QwtPlot * QwtPlotItem::plot | ( |  | ) | const`[inherited]`

Return attached plot.

int QwtPlotIntervalCurve::rtti | ( |  | ) | const`[virtual]`

Returns:
  QwtPlotItem::Rtti_PlotIntervalCurve

Reimplemented from QwtPlotItem.

QRectF QwtPlotItem::scaleRect | ( | const QwtScaleMap & | xMap,
|  | const QwtScaleMap & | yMap
| ) |  | const`[inherited]`

Calculate the bounding scale rect of 2 maps.

Parameters:

  xMap | X map
  yMap | X map

Returns:
  Bounding scale rect of the scale maps, normalized

void QwtPlotItem::setAxes | ( | int | xAxis,
|  | int | yAxis
| ) |  | `[inherited]`

Set X and Y axis

The item will painted according to the coordinates its Axes.

Parameters:

  xAxis | X Axis
  yAxis | Y Axis

See also:
  setXAxis(), setYAxis(), xAxis(), yAxis()

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 QwtPlotItem::setItemAttribute | ( | ItemAttribute | attribute,
|  | bool | on = `true`
| ) |  | `[inherited]`

Toggle an item attribute

Parameters:

  attribute | Attribute type
  on | true/false

See also:
  testItemAttribute(), ItemAttribute

void QwtPlotAbstractSeriesItem::setOrientation | ( | Qt::Orientation | orientation | ) | `[inherited]`

Set the orientation of the item.

The orientation() might be used in specific way by a plot item. F.e. a QwtPlotCurve uses it to identify how to display the curve int QwtPlotCurve::Steps or QwtPlotCurve::Sticks style.

See also:
  orientation()

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 QPen & | pen | ) |

Assign a pen.

Parameters:

  pen | New pen

See also:
  pen(), brush()

void QwtPlotItem::setRenderHint | ( | RenderHint | hint,
|  | bool | on = `true`
| ) |  | `[inherited]`

Toggle an render hint

Parameters:

  hint | Render hint
  on | true/false

See also:
  testRenderHint(), RenderHint

void QwtPlotIntervalCurve::setSamples | ( | const QVector< QwtIntervalSample > & | samples | ) |

Initialize data with an array of samples.

Parameters:

  samples | Vector of samples

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()

void QwtPlotItem::setTitle | ( | const QwtText & | title | ) | `[inherited]`

Set a new title

Parameters:

  title | Title

See also:
  title()

void QwtPlotItem::setTitle | ( | const QString & | title | ) | `[inherited]`

Set a new title

Parameters:

  title | Title

See also:
  title()

void QwtPlotItem::setVisible | ( | bool | on | ) | `[virtual, inherited]`

Show/Hide the item

Parameters:

  on | Show if true, otherwise hide

See also:
  isVisible(), show(), hide()

void QwtPlotItem::setXAxis | ( | int | axis | ) | `[inherited]`

Set the X axis

The item will painted according to the coordinates its Axes.

Parameters:

  axis | X Axis

See also:
  setAxes(), setYAxis(), xAxis()

void QwtPlotItem::setYAxis | ( | int | axis | ) | `[inherited]`

Set the Y axis

The item will painted according to the coordinates its Axes.

Parameters:

  axis | Y Axis

See also:
  setAxes(), setXAxis(), yAxis()

void QwtPlotItem::setZ | ( | double | z | ) | `[inherited]`

Set the z value.

Plot items are painted in increasing z-order.

Parameters:

  z | Z-value

See also:
  z(), QwtPlotDict::itemList()

void QwtPlotItem::show | ( |  | ) | `[inherited]`

Show the item.

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 QwtPlotItem::testItemAttribute | ( | ItemAttribute | attribute | ) | const`[inherited]`

Test an item attribute

Parameters:

  attribute | Attribute type

Returns:
  true/false

See also:
  setItemAttribute(), ItemAttribute

bool QwtPlotIntervalCurve::testPaintAttribute | ( | PaintAttribute | attribute | ) | const

Return the current paint attributes.

See also:
  PaintAttribute, setPaintAttribute()

bool QwtPlotItem::testRenderHint | ( | RenderHint | hint | ) | const`[inherited]`

Test a render hint

Parameters:

  hint | Render hint

Returns:
  true/false

See also:
  setRenderHint(), RenderHint

const QwtText & QwtPlotItem::title | ( |  | ) | const`[inherited]`

Returns:
  Title of the item

See also:
  setTitle()

void QwtPlotItem::updateLegend | ( | QwtLegend * | legend | ) | const`[virtual, inherited]`

Update the widget that represents the item on the legend.

updateLegend() is called from itemChanged() to adopt the widget representing the item on the legend to its new configuration.

The default implementation updates a QwtLegendItem(), but an item could be represented by any type of widget, by overloading legendItem() and updateLegend().

Parameters:

  legend | Legend

See also:
  legendItem(), itemChanged(), QwtLegend()

Implements QwtLegendItemManager.

Reimplemented in QwtPlotCurve, and QwtPlotMarker.

virtual void QwtPlotSeriesItem< QwtIntervalSample >::updateScaleDiv | ( | const QwtScaleDiv & | xScaleDiv,
|  | const QwtScaleDiv & | yScaleDiv
| ) |  | `[virtual, inherited]`

Update the rect of interest according to the current scale ranges

Parameters:

  xScaleDiv | Scale division of the x-axis
  yScaleDiv | Scale division of the y-axis

See also:
  QwtSeriesData<T>::setRectOfInterest()

Reimplemented from QwtPlotItem.

int QwtPlotItem::xAxis | ( |  | ) | const`[inherited]`

Return xAxis.

int QwtPlotItem::yAxis | ( |  | ) | const`[inherited]`

Return yAxis.

double QwtPlotItem::z | ( |  | ) | const`[inherited]`

Plot items are painted in increasing z-order.

Returns:
  setZ(), QwtPlotDict::itemList()

## Member Data Documentation

QwtSeriesData<QwtIntervalSample >* QwtPlotSeriesItem< QwtIntervalSample >::d_series`[protected, inherited]`

Series.