Qwt Polar User's Guide 0.1.0
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An item, which displays a spectrogram. More...
#include <qwt_polar_spectrogram.h>
Public Member Functions | |
QwtPolarSpectrogram () | |
virtual | ~QwtPolarSpectrogram () |
void | setData (const QwtRasterData &data) |
const QwtRasterData & | data () const |
void | setColorMap (const QwtColorMap &) |
const QwtColorMap & | colorMap () const |
virtual int | rtti () const |
virtual void | draw (QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QwtDoublePoint &pole, double radius, const QwtDoubleRect &canvasRect) const |
virtual QwtDoubleInterval | boundingInterval (int scaleId) const |
Protected Member Functions | |
virtual QImage | renderImage (const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QwtDoublePoint &pole, const QRect &rect) const |
An 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.
QwtPolarSpectrogram::QwtPolarSpectrogram | ( | ) | [explicit] |
Constructor.
QwtPolarSpectrogram::~QwtPolarSpectrogram | ( | ) | [virtual] |
Destructor.
QwtDoubleInterval QwtPolarSpectrogram::boundingInterval | ( | int | scaleId | ) | const [virtual] |
Interval, that is necessary to display the item This interval can be useful for operations like clipping or autoscaling
scaleId | Scale index |
Reimplemented from QwtPolarItem.
const QwtColorMap & QwtPolarSpectrogram::colorMap | ( | ) | const |
const QwtRasterData & QwtPolarSpectrogram::data | ( | ) | const |
void QwtPolarSpectrogram::draw | ( | QPainter * | painter, |
const QwtScaleMap & | azimuthMap, | ||
const QwtScaleMap & | radialMap, | ||
const QwtDoublePoint & | pole, | ||
double | radius, | ||
const QwtDoubleRect & | canvasRect | ||
) | const [virtual] |
Draw the spectrogram
painter | Painter |
azimuthMap | Maps azimuth values to values related to 0.0, M_2PI |
radialMap | Maps radius values into painter coordinates. |
pole | Position of the pole in painter coordinates |
radius | Radius of the complete plot area in painter coordinates |
canvasRect | Contents rect of the canvas in painter coordinates |
Implements QwtPolarItem.
QImage QwtPolarSpectrogram::renderImage | ( | const QwtScaleMap & | azimuthMap, |
const QwtScaleMap & | radialMap, | ||
const QwtDoublePoint & | pole, | ||
const QRect & | rect | ||
) | 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.
azimuthMap | Maps azimuth values to values related to 0.0, M_2PI |
radialMap | Maps radius values into painter coordinates. |
pole | Position of the pole in painter coordinates |
rect | Target rectangle of the image in painter coordinates |
int QwtPolarSpectrogram::rtti | ( | ) | const [virtual] |
Reimplemented from QwtPolarItem.
void QwtPolarSpectrogram::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 |
void QwtPolarSpectrogram::setData | ( | const QwtRasterData & | data | ) |
Set the data to be displayed
data | Spectrogram Data |