conflicting packages
| QwtPlotSpectrogram(3) | Qwt User's Guide | QwtPlotSpectrogram(3) |
NAME¶
QwtPlotSpectrogram -SYNOPSIS¶
#include <qwt_plot_spectrogram.h> Inherits QwtPlotRasterItem.Public Types¶
enum DisplayMode { ImageMode = 1, ContourMode = 2 }
Public Member Functions¶
QwtPlotSpectrogram (const QString &title=QString::null)
Protected Member Functions¶
virtual QSize contourRasterSize (const QwtDoubleRect &, const QRect &) 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 Enumeration Documentation¶
enum QwtPlotSpectrogram::DisplayMode¶
The display mode controls how the raster data will be represented.- •
- ImageMode
The values are mapped to colors using a color map.
- •
- ContourMode
The data is displayed using contour lines
setDisplayMode(), testDisplayMode()
Constructor & Destructor Documentation¶
QwtPlotSpectrogram::QwtPlotSpectrogram (const QString &title = QString::null) [explicit]¶
Sets the following item attributes:- •
- QwtPlotItem::AutoScale: true
- •
- QwtPlotItem::Legend: false
title Title
See also:
QwtPlotItem::setItemAttribute(),
QwtPlotItem::setZ()
Member Function Documentation¶
QwtDoubleRect QwtPlotSpectrogram::boundingRect () const [virtual]¶
Returns:Bounding rect of the data
See also:
QwtRasterData::boundingRect()
Reimplemented from QwtPlotItem.
const QwtColorMap & QwtPlotSpectrogram::colorMap () const¶
Returns:Color Map used for mapping the intensity values to
colors
See also:
setColorMap()
QwtValueList 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 (doublelevel) 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 QwtDoubleRect &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 data().rasterHint(). 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()
QPen QwtPlotSpectrogram::defaultContourPen () const¶
Returns:Default contour pen
See also:
setDefaultContourPen()
void QwtPlotSpectrogram::draw (QPainter *painter, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &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()
QSize QwtPlotSpectrogram::rasterHint (const QwtDoubleRect &rect) const [virtual]¶
Returns the recommended raster for a given rect. F.e the raster hint is used to limit the resolution of the image that is rendered. Parameters:rect Rect for the raster hint
Returns:
data().rasterHint(rect)
Reimplemented from QwtPlotRasterItem.
QwtRasterData::ContourLines QwtPlotSpectrogram::renderContourLines (const QwtDoubleRect &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(), setConrecAttribute(),
QwtRasterData::contourLines()
QImage QwtPlotSpectrogram::renderImage (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtDoubleRect &area) const [protected], [virtual]¶
Render an image from the data and color map. The area is translated into a rect of the paint device. For each pixel of this rect the intensity is mapped into a color. Parameters:xMap X-Scale Map
yMap Y-Scale Map
area Area that should be rendered in scale coordinates.
Returns:
A QImage::Format_Indexed8 or QImage::Format_ARGB32
depending on the color map.
See also:
QwtRasterData::intensity(), QwtColorMap::rgb(),
QwtColorMap::colorIndex()
Implements QwtPlotRasterItem.
int QwtPlotSpectrogram::rtti () const [virtual]¶
Returns:QwtPlotItem::Rtti_PlotSpectrogram
Reimplemented from QwtPlotItem.
void QwtPlotSpectrogram::setColorMap (const 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::setConrecAttribute ( QwtRasterData::ConrecAttributeattribute, boolon)¶
Modify an attribute of the CONREC algorithm, used to calculate the contour lines. Parameters:attribute CONREC attribute
on On/Off
See also:
testConrecAttribute(),
renderContourLines(), QwtRasterData::contourLines()
void QwtPlotSpectrogram::setContourLevels (const QwtValueList &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 (const 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 ( DisplayModemode, boolon = 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()
bool QwtPlotSpectrogram::testConrecAttribute ( QwtRasterData::ConrecAttributeattribute) const¶
Test an attribute of the CONREC algorithm, used to calculate the contour lines. Parameters:attribute CONREC attribute
Returns:
true, is enabled
See also:
setConrecAttribute(), renderContourLines(),
QwtRasterData::contourLines()
bool QwtPlotSpectrogram::testDisplayMode ( DisplayModemode) const¶
The display mode controls how the raster data will be represented. Parameters:mode Display mode
Returns:
true if mode is enabled
Author¶
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