---
name: "QwtPlotAbstractSeriesItem"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "6.0.0-1.2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtPlotAbstractSeriesItem"
---

# QwtPlotAbstractSeriesItem(3)

Base class for plot items representing a series of samples.

## NAME

QwtPlotAbstractSeriesItem -

Base class for plot items representing a series of samples.

## SYNOPSIS

`#include <qwt_plot_seriesitem.h>`

Inherits **QwtPlotItem**.

Inherited by **QwtPlotSeriesItem\< T \>**, **QwtPlotSeriesItem\< QPointF \>**, **QwtPlotSeriesItem\< QwtIntervalSample \>**, and **QwtPlotSeriesItem\< QwtPoint3D \>**.

### Public Member Functions

**QwtPlotAbstractSeriesItem** (const QString &title=QString::null)\
 **QwtPlotAbstractSeriesItem** (const **QwtText** &title)\
 virtual **~QwtPlotAbstractSeriesItem** ()\
 void **setOrientation** (Qt::Orientation)\
 Qt::Orientation **orientation** () const \
 virtual void **draw** (QPainter \*p, const **QwtScaleMap** &xMap, const **QwtScaleMap** &yMap, const QRectF &) const \
 virtual void **drawSeries** (QPainter \*painter, const **QwtScaleMap** &xMap, const **QwtScaleMap** &yMap, const QRectF &canvasRect, int from, int to) const =0\

## Detailed Description

Base class for plot items representing a series of samples.

## Constructor & Destructor Documentation

### QwtPlotAbstractSeriesItem::QwtPlotAbstractSeriesItem (const QString &title = `QString::null`)` [explicit]` Constructor

**Parameters:**

*title* Title of the curve

### QwtPlotAbstractSeriesItem::QwtPlotAbstractSeriesItem (const QwtText &title)` [explicit]` Constructor

**Parameters:**

*title* Title of the curve

### QwtPlotAbstractSeriesItem::~QwtPlotAbstractSeriesItem ()` [virtual]`

Destructor.

## Member Function Documentation

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

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**.

### virtual void QwtPlotAbstractSeriesItem::drawSeries (QPainter \*painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasRect, intfrom, intto) const` [pure 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 point to be painted \
 *to* Index of the last point to be painted. If to \< 0 the curve will be painted to its last point.

Implemented in **QwtPlotCurve**, **QwtPlotHistogram**, **QwtPlotIntervalCurve**, and **QwtPlotSpectroCurve**.

### Qt::Orientation QwtPlotAbstractSeriesItem::orientation () const Returns:

Orientation of the plot item

**See also:**

**setOrientation()**

### void QwtPlotAbstractSeriesItem::setOrientation (Qt::Orientationorientation) 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()**

## Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.