An item, which displays a spectrogram. More...
#include <qwt_polar_spectrogram.h>

| Public Types | |
| enum | PaintAttribute { ApproximatedAtan = 0x01 } | 
| typedef QFlags< PaintAttribute > | PaintAttributes | 
| Paint attributes. | |
|  Public Types inherited from QwtPolarItem | |
| enum | RttiValues { Rtti_PolarItem = 0, Rtti_PolarGrid, Rtti_PolarMarker, Rtti_PolarCurve, Rtti_PolarSpectrogram, Rtti_PolarUserItem = 1000 } | 
| Runtime type information.  More... | |
| enum | ItemAttribute { Legend = 0x01, AutoScale = 0x02 } | 
| Plot Item Attributes.  More... | |
| enum | RenderHint { RenderAntialiased = 0x01 } | 
| Render hints.  More... | |
| typedef QFlags< ItemAttribute > | ItemAttributes | 
| Item attributes. | |
| typedef QFlags< RenderHint > | RenderHints | 
| Item attributes. | |
| Public Member Functions | |
| QwtPolarSpectrogram () | |
| Constructor. | |
| virtual | ~QwtPolarSpectrogram () | 
| Destructor. | |
| void | setData (QwtRasterData *data) | 
| const QwtRasterData * | data () const | 
| void | setColorMap (QwtColorMap *) | 
| const QwtColorMap * | colorMap () const | 
| void | setPaintAttribute (PaintAttribute, bool on=true) | 
| bool | testPaintAttribute (PaintAttribute) const | 
| virtual int | rtti () const | 
| virtual void | draw (QPainter *painter, const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, double radius, const QRectF &canvasRect) const | 
| virtual QwtInterval | boundingInterval (int scaleId) const | 
|  Public Member Functions inherited from QwtPolarItem | |
| QwtPolarItem (const QwtText &title=QwtText()) | |
| virtual | ~QwtPolarItem () | 
| Destroy the QwtPolarItem. | |
| void | attach (QwtPolarPlot *plot) | 
| Attach the item to a plot.  More... | |
| void | detach () | 
| This method detaches a QwtPolarItem from the QwtPolarPlot it has been associated with.  More... | |
| QwtPolarPlot * | plot () const | 
| void | setTitle (const QString &title) | 
| void | setTitle (const QwtText &title) | 
| const QwtText & | title () const | 
| void | setItemAttribute (ItemAttribute, bool on=true) | 
| bool | testItemAttribute (ItemAttribute) const | 
| void | setRenderHint (RenderHint, bool on=true) | 
| bool | testRenderHint (RenderHint) const | 
| void | setRenderThreadCount (uint numThreads) | 
| uint | renderThreadCount () const | 
| double | z () const | 
| void | setZ (double z) | 
| Set the z value.  More... | |
| void | show () | 
| Show the item. | |
| void | hide () | 
| Hide the item. | |
| virtual void | setVisible (bool) | 
| bool | isVisible () const | 
| virtual void | itemChanged () | 
| virtual void | legendChanged () | 
| virtual void | updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &, const QwtInterval &) | 
| Update the item to changes of the axes scale division.  More... | |
| virtual int | marginHint () const | 
| void | setLegendIconSize (const QSize &) | 
| QSize | legendIconSize () const | 
| virtual QList< QwtLegendData > | legendData () const | 
| Return all information, that is needed to represent the item on the legend.  More... | |
| virtual QwtGraphic | legendIcon (int index, const QSizeF &) const | 
| Protected Member Functions | |
| virtual QImage | renderImage (const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, const QRect &rect) const | 
| Render an image from the data and color map.  More... | |
| virtual void | renderTile (const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap, const QPointF &pole, const QPoint &imagePos, const QRect &tile, QImage *image) const | 
| Render a sub-rectangle of an image.  More... | |
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.
Attributes to modify the drawing algorithm. The default setting disables ApproximatedAtan
| Enumerator | |
|---|---|
| ApproximatedAtan | Use qwtFastAtan2 instead of atan2 for translating widget into polar coordinates. | 
| 
 | 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 | 
| 
 | 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.
| 
 | protectedvirtual | 
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 | 
| 
 | protectedvirtual | 
Render a sub-rectangle of an image.
renderTile() is called by renderImage() to render different parts of the image by concurrent threads.
| 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 | 
| imagePos | Top/left position of the image in painter coordinates | 
| tile | Sub-rectangle of the tile in painter coordinates | 
| image | Image to be rendered | 
| 
 | virtual | 
Reimplemented from QwtPolarItem.
| void QwtPolarSpectrogram::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.
| colorMap | Color Map | 
| void QwtPolarSpectrogram::setData | ( | QwtRasterData * | data | ) | 
Set the data to be displayed
| data | Spectrogram Data | 
| void QwtPolarSpectrogram::setPaintAttribute | ( | PaintAttribute | attribute, | 
| bool | on = true | ||
| ) | 
Specify an attribute how to draw the curve
| attribute | Paint attribute | 
| on | On/Off | 
| bool QwtPolarSpectrogram::testPaintAttribute | ( | PaintAttribute | attribute | ) | const | 
| attribute | Paint attribute | 
 1.8.5
 1.8.5