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.
Definition at line 35 of file qwt_plot_spectrogram.h.
Public Types | |
enum | DisplayMode { ImageMode = 1, ContourMode = 2 } |
Public Member Functions | |
QwtPlotSpectrogram (const QString &title=QString::null) | |
virtual | ~QwtPlotSpectrogram () |
void | setDisplayMode (DisplayMode, bool on=true) |
bool | testDisplayMode (DisplayMode) const |
void | setData (const QwtRasterData &data) |
const QwtRasterData & | data () const |
void | setColorMap (const QwtColorMap &) |
const QwtColorMap & | colorMap () const |
virtual QwtDoubleRect | boundingRect () const |
virtual QSize | rasterHint (const QwtDoubleRect &) const |
void | setDefaultContourPen (const QPen &) |
QPen | defaultContourPen () const |
virtual QPen | contourPen (double level) const |
void | setConrecAttribute (QwtRasterData::ConrecAttribute, bool on) |
bool | testConrecAttribute (QwtRasterData::ConrecAttribute) const |
void | setContourLevels (const QwtValueList &) |
QwtValueList | contourLevels () const |
virtual int | rtti () const |
virtual void | draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &rect) const |
Protected Member Functions | |
virtual QImage | renderImage (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtDoubleRect &rect) const |
virtual QSize | contourRasterSize (const QwtDoubleRect &, const QRect &) const |
virtual QwtRasterData::ContourLines | renderContourLines (const QwtDoubleRect &rect, const QSize &raster) const |
virtual void | drawContourLines (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtRasterData::ContourLines &lines) const |
The display mode controls how the raster data will be represented.
When both modes are enabled the contour lines are painted on top of the spectrogram. The default setting enables ImageMode.
Definition at line 51 of file qwt_plot_spectrogram.h.
QwtPlotSpectrogram::QwtPlotSpectrogram | ( | const QString & | title = QString::null |
) | [explicit] |
Sets the following item attributes:
The z value is initialized by 8.0.
title | Title |
Definition at line 134 of file qwt_plot_spectrogram.cpp.
References QwtPlotItem::setItemAttribute(), and QwtPlotItem::setZ().
QwtPlotSpectrogram::~QwtPlotSpectrogram | ( | ) | [virtual] |
void QwtPlotSpectrogram::setDisplayMode | ( | DisplayMode | mode, | |
bool | on = true | |||
) |
The display mode controls how the raster data will be represented.
mode | Display mode | |
on | On/Off |
Definition at line 167 of file qwt_plot_spectrogram.cpp.
References QwtPlotItem::itemChanged().
bool QwtPlotSpectrogram::testDisplayMode | ( | DisplayMode | mode | ) | const |
The display mode controls how the raster data will be represented.
mode | Display mode |
Definition at line 186 of file qwt_plot_spectrogram.cpp.
void QwtPlotSpectrogram::setData | ( | const QwtRasterData & | data | ) |
Set the data to be displayed
data | Spectrogram Data |
Definition at line 342 of file qwt_plot_spectrogram.cpp.
References QwtRasterData::copy(), QwtPlotRasterItem::invalidateCache(), and QwtPlotItem::itemChanged().
const QwtRasterData & QwtPlotSpectrogram::data | ( | ) | const |
Definition at line 355 of file qwt_plot_spectrogram.cpp.
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.
colorMap | Color Map |
Definition at line 202 of file qwt_plot_spectrogram.cpp.
References QwtColorMap::copy(), QwtPlotRasterItem::invalidateCache(), and QwtPlotItem::itemChanged().
const QwtColorMap & QwtPlotSpectrogram::colorMap | ( | ) | const |
Definition at line 215 of file qwt_plot_spectrogram.cpp.
QwtDoubleRect QwtPlotSpectrogram::boundingRect | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
Definition at line 364 of file qwt_plot_spectrogram.cpp.
Referenced by draw().
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.
rect | Rect for the raster hint |
Reimplemented from QwtPlotRasterItem.
Definition at line 378 of file qwt_plot_spectrogram.cpp.
Referenced by contourRasterSize().
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().
Definition at line 230 of file qwt_plot_spectrogram.cpp.
References QwtPlotItem::itemChanged().
QPen QwtPlotSpectrogram::defaultContourPen | ( | ) | const |
Definition at line 243 of file qwt_plot_spectrogram.cpp.
Referenced by drawContourLines().
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
level | Contour level |
Definition at line 259 of file qwt_plot_spectrogram.cpp.
Referenced by drawContourLines().
void QwtPlotSpectrogram::setConrecAttribute | ( | QwtRasterData::ConrecAttribute | attribute, | |
bool | on | |||
) |
Modify an attribute of the CONREC algorithm, used to calculate the contour lines.
attribute | CONREC attribute | |
on | On/Off |
Definition at line 276 of file qwt_plot_spectrogram.cpp.
References QwtPlotItem::itemChanged().
bool QwtPlotSpectrogram::testConrecAttribute | ( | QwtRasterData::ConrecAttribute | attribute | ) | const |
Test an attribute of the CONREC algorithm, used to calculate the contour lines.
attribute | CONREC attribute |
Definition at line 299 of file qwt_plot_spectrogram.cpp.
void QwtPlotSpectrogram::setContourLevels | ( | const QwtValueList & | levels | ) |
Set the levels of the contour lines
levels | Values of the contour levels |
Definition at line 313 of file qwt_plot_spectrogram.cpp.
References QwtPlotItem::itemChanged().
QwtValueList QwtPlotSpectrogram::contourLevels | ( | ) | const |
Return the levels of the contour lines.
The levels are sorted in increasing order.
Definition at line 331 of file qwt_plot_spectrogram.cpp.
int QwtPlotSpectrogram::rtti | ( | ) | const [virtual] |
Reimplemented from QwtPlotItem.
Definition at line 152 of file qwt_plot_spectrogram.cpp.
void QwtPlotSpectrogram::draw | ( | QPainter * | painter, | |
const QwtScaleMap & | xMap, | |||
const QwtScaleMap & | yMap, | |||
const QRect & | canvasRect | |||
) | const [virtual] |
Draw the spectrogram.
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 |
Reimplemented from QwtPlotRasterItem.
Definition at line 616 of file qwt_plot_spectrogram.cpp.
References boundingRect(), contourRasterSize(), QwtPlotRasterItem::draw(), drawContourLines(), QwtPlotItem::invTransform(), renderContourLines(), and QwtPlotItem::transform().
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.
xMap | X-Scale Map | |
yMap | Y-Scale Map | |
area | Area that should be rendered in scale coordinates. |
Implements QwtPlotRasterItem.
Definition at line 400 of file qwt_plot_spectrogram.cpp.
References QwtScaleMap::invTransform(), QwtScaleMap::p1(), QwtScaleMap::p2(), QwtScaleMap::s1(), QwtScaleMap::s2(), QwtScaleMap::setPaintInterval(), QwtScaleMap::setScaleInterval(), and QwtPlotItem::transform().
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().
area | Rect, where to calculate the contour lines | |
rect | Rect in pixel coordinates, where to paint the contour lines |
Definition at line 530 of file qwt_plot_spectrogram.cpp.
References rasterHint().
Referenced by draw().
QwtRasterData::ContourLines QwtPlotSpectrogram::renderContourLines | ( | const QwtDoubleRect & | rect, | |
const QSize & | raster | |||
) | const [protected, virtual] |
Calculate contour lines
rect | Rectangle, where to calculate the contour lines | |
raster | Raster, used by the CONREC algorithm |
Definition at line 550 of file qwt_plot_spectrogram.cpp.
Referenced by draw().
void QwtPlotSpectrogram::drawContourLines | ( | QPainter * | painter, | |
const QwtScaleMap & | xMap, | |||
const QwtScaleMap & | yMap, | |||
const QwtRasterData::ContourLines & | contourLines | |||
) | const [protected, virtual] |
Paint the contour lines
painter | Painter | |
xMap | Maps x-values into pixel coordinates. | |
yMap | Maps y-values into pixel coordinates. | |
contourLines | Contour lines |
Definition at line 567 of file qwt_plot_spectrogram.cpp.
References contourPen(), defaultContourPen(), QwtPainter::drawLine(), and QwtScaleMap::transform().
Referenced by draw().