#include <qwt_plot_spectrogram.h>

Inherits QwtPlotRasterItem.

Public Types
enum	CachePolicy { NoCache, PaintCache }
enum	DisplayMode { ImageMode = 0x01, ContourMode = 0x02 }
typedef QFlags< DisplayMode >	DisplayModes
enum	ItemAttribute { Legend = 0x01, AutoScale = 0x02 }
typedef QFlags< ItemAttribute >	ItemAttributes
enum	PaintAttribute { PaintInDeviceResolution = 1 }
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
int	alpha () const
void	attach (QwtPlot *plot)
virtual QRectF	boundingRect () const
CachePolicy	cachePolicy () const
const QwtColorMap *	colorMap () const
QList< double >	contourLevels () const
virtual QPen	contourPen (double level) const
const QwtRasterData *	data () const
QwtRasterData *	data ()
QPen	defaultContourPen () const
void	detach ()
virtual void	draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &rect) const
virtual void	drawLegendIdentifier (QPainter *, const QRectF &) const
void	hide ()
virtual QwtInterval	interval (Qt::Axis) const
void	invalidateCache ()
bool	isVisible () const
virtual void	itemChanged ()
virtual QWidget *	legendItem () const
QRectF	paintRect (const QwtScaleMap &, const QwtScaleMap &) const
virtual QRectF	pixelHint (const QRectF &) const
QwtPlot *	plot () const
	QwtPlotSpectrogram (const QString &title=QString::null)
uint	renderThreadCount () const
virtual int	rtti () const
QRectF	scaleRect (const QwtScaleMap &, const QwtScaleMap &) const
void	setAlpha (int alpha)
void	setAxes (int xAxis, int yAxis)
void	setCachePolicy (CachePolicy)
void	setColorMap (QwtColorMap *)
void	setConrecFlag (QwtRasterData::ConrecFlag, bool on)
void	setContourLevels (const QList< double > &)
void	setData (QwtRasterData *data)
void	setDefaultContourPen (const QPen &)
void	setDisplayMode (DisplayMode, bool on=true)
void	setItemAttribute (ItemAttribute, bool on=true)
void	setPaintAttribute (PaintAttribute, bool on=true)
void	setRenderHint (RenderHint, bool on=true)
void	setRenderThreadCount (uint numThreads)
void	setTitle (const QString &title)
void	setTitle (const QwtText &title)
virtual void	setVisible (bool)
void	setXAxis (int axis)
void	setYAxis (int axis)
void	setZ (double z)
void	show ()
bool	testConrecFlag (QwtRasterData::ConrecFlag) const
bool	testDisplayMode (DisplayMode) 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	~QwtPlotSpectrogram ()
Protected Member Functions
virtual QSize	contourRasterSize (const QRectF &, const QRect &) const
virtual void	drawContourLines (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtRasterData::ContourLines &lines) const
virtual QwtScaleMap	imageMap (Qt::Orientation, const QwtScaleMap &map, const QRectF &area, const QSize &imageSize, double pixelSize) const
virtual QwtRasterData::ContourLines	renderContourLines (const QRectF &rect, const QSize &raster) const
virtual QImage	renderImage (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &area, const QSize &imageSize) const
void	renderTile (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &imageRect, QImage *image) const

Detailed Description

A plot item, which displays a spectrogram.

A spectrogram displays threedimenional data, where the 3rd dimension ( the intensity ) is displayed using colors. The colors are calculated from the values using a color map.

In ContourMode contour lines are painted for the contour levels.

See also:: QwtRasterData, QwtColorMap

Member Typedef Documentation

typedef QFlags<DisplayMode> QwtPlotSpectrogram::DisplayModes

Display modes.

typedef QFlags<ItemAttribute> QwtPlotItem::ItemAttributes [inherited]

Plot Item Attributes.

typedef QFlags<PaintAttribute> QwtPlotRasterItem::PaintAttributes [inherited]

Paint attributes.

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

Render hints.

Member Enumeration Documentation

enum QwtPlotRasterItem::CachePolicy [inherited]

NoCache
renderImage() is called, whenever the item has to be repainted
PaintCache
renderImage() is called, whenever the image cache is not valid, or the scales, or the size of the canvas has changed. This type of cache is only useful for improving the performance of hide/show operations. All other situations are already handled by the plot canvas cache.

The default policy is NoCache

enum QwtPlotSpectrogram::DisplayMode

The display mode controls how the raster data will be represented.

See also:: setDisplayMode(), testDisplayMode()

Enumerator:

ImageMode	The values are mapped to colors using a color map.
ContourMode	The data is displayed using contour lines.

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 QwtPlotRasterItem::PaintAttribute [inherited]

Attributes to modify the drawing algorithm.

See also:: setPaintAttribute(), testPaintAttribute()

Enumerator:

PaintInDeviceResolution

When the image is rendered according to the data pixels ( QwtRasterData::pixelHint() ) it can be expanded to paint device resolution before it is passed to QPainter. The expansion algorithm rounds the pixel borders in the same way as the axis ticks, what is usually better than the scaling algorithm implemented in Qt. Disabling this flag might make sense, to reduce the size of a document/file. If this is possible for a document format depends on the implementation of the specific QPaintEngine.

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.

Enumerator:

Rtti_PlotItem	Unspecific value, that can be used, when it doesn't matter.
Rtti_PlotGrid	For QwtPlotGrid.
Rtti_PlotScale	For QwtPlotScaleItem.
Rtti_PlotMarker	For QwtPlotMarker.
Rtti_PlotCurve	For QwtPlotCurve.
Rtti_PlotSpectroCurve	For QwtPlotSpectroCurve.
Rtti_PlotIntervalCurve	For QwtPlotIntervalCurve.
Rtti_PlotHistogram	For QwtPlotHistogram.
Rtti_PlotSpectrogram	For QwtPlotSpectrogram.
Rtti_PlotSVG	For QwtPlotSvgItem.
Rtti_PlotUserItem	Values >= Rtti_PlotUserItem are reserved for plot items not implemented in the Qwt library.

Constructor & Destructor Documentation

QwtPlotSpectrogram::QwtPlotSpectrogram ( const QString & title = QString::null ) [explicit]

Sets the following item attributes:

QwtPlotItem::AutoScale: true
QwtPlotItem::Legend: false

The z value is initialized by 8.0.

Parameters:

title Title

See also:: QwtPlotItem::setItemAttribute(), QwtPlotItem::setZ()

QwtPlotSpectrogram::~QwtPlotSpectrogram ( ) [virtual]

Destructor.

Member Function Documentation

int QwtPlotRasterItem::alpha ( ) const [inherited]

Returns:: Alpha value of the raster item

See also:: setAlpha()

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 QwtPlotRasterItem::boundingRect ( ) const [virtual, inherited]

Returns:: Bounding rect of the data

See also:: QwtPlotRasterItem::interval()

Reimplemented from QwtPlotItem.

QwtPlotRasterItem::CachePolicy QwtPlotRasterItem::cachePolicy ( ) const [inherited]

Returns:: Cache policy

See also:: CachePolicy, setCachePolicy()

const QwtColorMap * QwtPlotSpectrogram::colorMap ( ) const

Returns:: Color Map used for mapping the intensity values to colors

See also:: setColorMap()

QList< double > QwtPlotSpectrogram::contourLevels ( ) const

Return the levels of the contour lines.

The levels are sorted in increasing order.

See also:: contourLevels(), renderContourLines(), QwtRasterData::contourLines()

QPen QwtPlotSpectrogram::contourPen ( double level ) const [virtual]

Calculate the pen for a contour line.

The color of the pen is the color for level calculated by the color map

Parameters:

level Contour level

Returns:: Pen for the contour line

Note:: contourPen is only used if defaultContourPen().style() == Qt::NoPen

See also:: setDefaultContourPen(), setColorMap(), setContourLevels()

QSize QwtPlotSpectrogram::contourRasterSize	(	const QRectF &	area,
		const QRect &	rect
	)		const `[protected, virtual]`

Return the raster to be used by the CONREC contour algorithm.

A larger size will improve the precisision of the CONREC algorithm, but will slow down the time that is needed to calculate the lines.

The default implementation returns rect.size() / 2 bounded to the resolution depending on pixelSize().

Parameters:

area	Rect, where to calculate the contour lines
rect	Rect in pixel coordinates, where to paint the contour lines

Returns:: Raster to be used by the CONREC contour algorithm.

Note:: The size will be bounded to rect.size().

See also:: drawContourLines(), QwtRasterData::contourLines()

const QwtRasterData * QwtPlotSpectrogram::data ( ) const

Returns:: Spectrogram data

See also:: setData()

QwtRasterData * QwtPlotSpectrogram::data ( )

Returns:: Spectrogram data

See also:: setData()

QPen QwtPlotSpectrogram::defaultContourPen ( ) const

Returns:: Default contour pen

See also:: setDefaultContourPen()

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 QwtPlotSpectrogram::draw	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	canvasRect
	)		const `[virtual]`

Draw the spectrogram.

Parameters:

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

See also:: setDisplayMode(), renderImage(), QwtPlotRasterItem::draw(), drawContourLines()

Reimplemented from QwtPlotRasterItem.

void QwtPlotSpectrogram::drawContourLines	(	QPainter *	painter,
		const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QwtRasterData::ContourLines &	contourLines
	)		const `[protected, virtual]`

Paint the contour lines

Parameters:

painter	Painter
xMap	Maps x-values into pixel coordinates.
yMap	Maps y-values into pixel coordinates.
contourLines	Contour lines

See also:: renderContourLines(), defaultContourPen(), contourPen()

virtual void QwtLegendItemManager::drawLegendIdentifier	(	QPainter *	,
		const QRectF &
	)		const `[inline, virtual, inherited]`

QwtLegendItem can display an icon-identifier followed by a text. The icon helps to identify a plot item on the plot canvas and depends on the type of information, that is displayed.

The default implementation paints nothing.

Reimplemented in QwtPlotCurve, QwtPlotIntervalCurve, QwtPlotMarker, and QwtPlotHistogram.

void QwtPlotItem::hide ( ) [inherited]

Hide the item.

QwtScaleMap QwtPlotRasterItem::imageMap	(	Qt::Orientation	orientation,
		const QwtScaleMap &	map,
		const QRectF &	area,
		const QSize &	imageSize,
		double	pixelSize
	)		const `[protected, virtual, inherited]`

Calculate a scale map for painting to an image.

Parameters:

orientation	Orientation, Qt::Horizontal means a X axis
map	Scale map for rendering the plot item
area	Area to be painted on the image
imageSize	Image size
pixelSize	Width/Height of a data pixel

QwtInterval QwtPlotSpectrogram::interval ( Qt::Axis axis ) const [virtual]

Returns:: Bounding interval for an axis

The default implementation returns the interval of the associated raster data object.

Parameters:

axis	X, Y, or Z axis

See also:: QwtRasterData::interval()

Reimplemented from QwtPlotRasterItem.

void QwtPlotRasterItem::invalidateCache ( ) [inherited]

Invalidate the paint cache

See also:: setCachePolicy()

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.

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

QRectF QwtPlotSpectrogram::pixelHint ( const QRectF & area ) const [virtual]

Pixel hint.

The geometry of a pixel is used to calculated the resolution and alignment of the rendered image.

The default implementation returns data()->pixelHint( rect );

Parameters:

area	In most implementations the resolution of the data doesn't depend on the requested area.

Returns:: Bounding rectangle of a pixel

See also:: QwtPlotRasterItem::pixelHint(), QwtRasterData::pixelHint(), render(), renderImage()

Reimplemented from QwtPlotRasterItem.

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

Return attached plot.

QwtRasterData::ContourLines QwtPlotSpectrogram::renderContourLines	(	const QRectF &	rect,
		const QSize &	raster
	)		const `[protected, virtual]`

Calculate contour lines

Parameters:

rect	Rectangle, where to calculate the contour lines
raster	Raster, used by the CONREC algorithm

See also:: contourLevels(), setConrecFlag(), QwtRasterData::contourLines()

QImage QwtPlotSpectrogram::renderImage	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRectF &	area,
		const QSize &	imageSize
	)		const `[protected, virtual]`

Render an image from data and color map.

For each pixel of rect the value is mapped into a color.

Parameters:

xMap	X-Scale Map
yMap	Y-Scale Map
area	Requested area for the image in scale coordinates
imageSize	Size of the requested image

Returns:: A QImage::Format_Indexed8 or QImage::Format_ARGB32 depending on the color map.

See also:: QwtRasterData::value(), QwtColorMap::rgb(), QwtColorMap::colorIndex()

Implements QwtPlotRasterItem.

uint QwtPlotSpectrogram::renderThreadCount ( ) const

Returns:: Number of threads to be used for rendering. If numThreads is set to 0, the system specific ideal thread count is used.

Warning:: Rendering in multiple threads is only supported for Qt >= 4.4

See also:: setRenderThreadCount(), renderImage(), renderTile()

void QwtPlotSpectrogram::renderTile	(	const QwtScaleMap &	xMap,
		const QwtScaleMap &	yMap,
		const QRect &	tile,
		QImage *	image
	)		const `[protected]`

Render a tile of an image.

Rendering in tiles can be used to composite an image in parallel threads.

Parameters:

xMap	X-Scale Map
yMap	Y-Scale Map
tile	Geometry of the tile in image coordinates
image	Image to be rendered

int QwtPlotSpectrogram::rtti ( ) const [virtual]

Returns:: QwtPlotItem::Rtti_PlotSpectrogram

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 QwtPlotRasterItem::setAlpha ( int alpha ) [inherited]

Set an alpha value for the raster data.

Often a plot has several types of raster data organized in layers. ( f.e a geographical map, with weather statistics ). Using setAlpha() raster items can be stacked easily.

The alpha value is a value [0, 255] to control the transparency of the image. 0 represents a fully transparent color, while 255 represents a fully opaque color.

Parameters:

alpha Alpha value

alpha >= 0
All alpha values of the pixels returned by renderImage() will be set to alpha, beside those with an alpha value of 0 (invalid pixels).
alpha < 0 The alpha values returned by renderImage() are not changed.

The default alpha value is -1.

See also:: alpha()

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 QwtPlotRasterItem::setCachePolicy ( QwtPlotRasterItem::CachePolicy policy ) [inherited]

Change the cache policy

The default policy is NoCache

Parameters:

policy Cache policy

See also:: CachePolicy, cachePolicy()

void QwtPlotSpectrogram::setColorMap ( QwtColorMap * colorMap )

Change the color map

Often it is useful to display the mapping between intensities and colors as an additional plot axis, showing a color bar.

Parameters:

colorMap Color Map

See also:: colorMap(), QwtScaleWidget::setColorBarEnabled(), QwtScaleWidget::setColorMap()

void QwtPlotSpectrogram::setConrecFlag	(	QwtRasterData::ConrecFlag	flag,
		bool	on
	)

Modify an attribute of the CONREC algorithm, used to calculate the contour lines.

Parameters:

flag	CONREC flag
on	On/Off

See also:: testConrecFlag(), renderContourLines(), QwtRasterData::contourLines()

void QwtPlotSpectrogram::setContourLevels ( const QList< double > & levels )

Set the levels of the contour lines

Parameters:

levels Values of the contour levels

See also:: contourLevels(), renderContourLines(), QwtRasterData::contourLines()

Note:: contourLevels returns the same levels but sorted.

void QwtPlotSpectrogram::setData ( QwtRasterData * data )

Set the data to be displayed

Parameters:

data	Spectrogram Data

See also:: data()

void QwtPlotSpectrogram::setDefaultContourPen ( const QPen & pen )

Set the default pen for the contour lines.

If the spectrogram has a valid default contour pen a contour line is painted using the default contour pen. Otherwise (pen.style() == Qt::NoPen) the pen is calculated for each contour level using contourPen().

See also:: defaultContourPen(), contourPen()

void QwtPlotSpectrogram::setDisplayMode	(	DisplayMode	mode,
		bool	on = `true`
	)

The display mode controls how the raster data will be represented.

Parameters:

mode	Display mode
on	On/Off

The default setting enables ImageMode.

See also:: DisplayMode, displayMode()

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 QwtPlotRasterItem::setPaintAttribute	(	PaintAttribute	attribute,
		bool	on = `true`
	)		`[inherited]`

Specify an attribute how to draw the raster item

Parameters:

attribute	Paint attribute
on	On/Off /sa PaintAttribute, testPaintAttribute()

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 QwtPlotSpectrogram::setRenderThreadCount ( uint numThreads )

Rendering an image from the raster data can often be done parallel on a multicore system.

Parameters:

numThreads Number of threads to be used for rendering. If numThreads is set to 0, the system specific ideal thread count is used.

The default thread count is 1 ( = no additional threads )

Warning:: Rendering in multiple threads is only supported for Qt >= 4.4

See also:: renderThreadCount(), renderImage(), renderTile()

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

Set a new title

Parameters:

title Title

See also:: title()

void QwtPlotItem::setTitle ( const QwtText & 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.

bool QwtPlotSpectrogram::testConrecFlag ( QwtRasterData::ConrecFlag flag ) const

Test an attribute of the CONREC algorithm, used to calculate the contour lines.

Parameters:

flag	CONREC flag

Returns:: true, is enabled

See also:: setConrecClag(), renderContourLines(), QwtRasterData::contourLines()

bool QwtPlotSpectrogram::testDisplayMode ( DisplayMode mode ) const

The display mode controls how the raster data will be represented.

Parameters:

mode	Display mode

Returns:: true if mode is enabled

bool QwtPlotItem::testItemAttribute ( ItemAttribute attribute ) const [inherited]

Test an item attribute

Parameters:

attribute Attribute type

Returns:: true/false

See also:: setItemAttribute(), ItemAttribute

bool QwtPlotRasterItem::testPaintAttribute ( PaintAttribute attribute ) const [inherited]

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.

void QwtPlotItem::updateScaleDiv	(	const QwtScaleDiv &	xScaleDiv,
		const QwtScaleDiv &	yScaleDiv
	)		`[virtual, inherited]`

Update the item to changes of the axes scale division.

Update the item, when the axes of plot have changed. The default implementation does nothing, but items that depend on the scale division (like QwtPlotGrid()) have to reimplement updateScaleDiv()

Parameters:

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

See also:: QwtPlot::updateAxes()

Reimplemented in QwtPlotScaleItem, QwtPlotSeriesItem< T >, QwtPlotSeriesItem< QwtIntervalSample >, QwtPlotSeriesItem< QPointF >, QwtPlotSeriesItem< QwtPoint3D >, and QwtPlotGrid.

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()

Public Types

Public Member Functions

Protected Member Functions

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation