|  | 
| enum | DisplayMode { ImageMode = 0x01, 
ContourMode = 0x02
 } | 
|  | 
| typedef QFlags< DisplayMode > | DisplayModes | 
|  | Display modes. 
 | 
|  | 
| enum | CachePolicy { NoCache, 
PaintCache
 } | 
|  | Cache policy The default policy is NoCache.  More... 
 | 
|  | 
| enum | PaintAttribute { PaintInDeviceResolution = 1
 } | 
|  | 
| typedef QFlags< PaintAttribute > | PaintAttributes | 
|  | Paint attributes. 
 | 
|  | 
| enum | RttiValues { Rtti_PlotItem = 0, 
Rtti_PlotGrid, 
Rtti_PlotScale, 
Rtti_PlotLegend,
 Rtti_PlotMarker, 
Rtti_PlotCurve, 
Rtti_PlotSpectroCurve, 
Rtti_PlotIntervalCurve,
 Rtti_PlotHistogram, 
Rtti_PlotSpectrogram, 
Rtti_PlotSVG, 
Rtti_PlotTradingCurve,
 Rtti_PlotBarChart, 
Rtti_PlotMultiBarChart, 
Rtti_PlotShape, 
Rtti_PlotTextLabel,
 Rtti_PlotZone, 
Rtti_PlotUserItem = 1000
 }
 | 
|  | Runtime type information.  More... 
 | 
|  | 
| enum | ItemAttribute { Legend = 0x01, 
AutoScale = 0x02, 
Margins = 0x04
 } | 
|  | Plot Item Attributes.  More... 
 | 
|  | 
| enum | ItemInterest { ScaleInterest = 0x01, 
LegendInterest = 0x02
 } | 
|  | Plot Item Interests.  More... 
 | 
|  | 
| enum | RenderHint { RenderAntialiased = 0x1
 } | 
|  | Render hints.  More... 
 | 
|  | 
| typedef QFlags< ItemAttribute > | ItemAttributes | 
|  | Plot Item Attributes. 
 | 
|  | 
| typedef QFlags< ItemInterest > | ItemInterests | 
|  | Plot Item Interests. 
 | 
|  | 
| typedef QFlags< RenderHint > | RenderHints | 
|  | Render hints. 
 | 
|  | 
|  | 
|  | QwtPlotSpectrogram (const QString &title=QString::null) | 
|  | 
| virtual | ~QwtPlotSpectrogram () | 
|  | Destructor. 
 | 
|  | 
| void | setDisplayMode (DisplayMode, bool on=true) | 
|  | 
| bool | testDisplayMode (DisplayMode) const | 
|  | 
| void | setData (QwtRasterData *data) | 
|  | 
| const QwtRasterData * | data () const | 
|  | 
| QwtRasterData * | data () | 
|  | 
| void | setColorMap (QwtColorMap *) | 
|  | 
| const QwtColorMap * | colorMap () const | 
|  | 
| virtual QwtInterval | interval (Qt::Axis) const | 
|  | 
| virtual QRectF | pixelHint (const QRectF &) const | 
|  | Pixel hint.  More... 
 | 
|  | 
| void | setDefaultContourPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine) | 
|  | 
| void | setDefaultContourPen (const QPen &) | 
|  | Set the default pen for the contour lines.  More... 
 | 
|  | 
| QPen | defaultContourPen () const | 
|  | 
| virtual QPen | contourPen (double level) const | 
|  | Calculate the pen for a contour line.  More... 
 | 
|  | 
| void | setConrecFlag (QwtRasterData::ConrecFlag, bool on) | 
|  | 
| bool | testConrecFlag (QwtRasterData::ConrecFlag) const | 
|  | 
| void | setContourLevels (const QList< double > &) | 
|  | 
| QList< double > | contourLevels () const | 
|  | 
| virtual int | rtti () const | 
|  | 
| virtual void | draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &rect) const | 
|  | Draw the spectrogram.  More... 
 | 
|  | 
|  | QwtPlotRasterItem (const QString &title=QString::null) | 
|  | Constructor. 
 | 
|  | 
|  | QwtPlotRasterItem (const QwtText &title) | 
|  | Constructor. 
 | 
|  | 
| virtual | ~QwtPlotRasterItem () | 
|  | Destructor. 
 | 
|  | 
| void | setPaintAttribute (PaintAttribute, bool on=true) | 
|  | 
| bool | testPaintAttribute (PaintAttribute) const | 
|  | 
| void | setAlpha (int alpha) | 
|  | Set an alpha value for the raster data.  More... 
 | 
|  | 
| int | alpha () const | 
|  | 
| void | setCachePolicy (CachePolicy) | 
|  | 
| CachePolicy | cachePolicy () const | 
|  | 
| void | invalidateCache () | 
|  | 
| virtual QRectF | boundingRect () const | 
|  | 
|  | QwtPlotItem (const QwtText &title=QwtText()) | 
|  | 
| virtual | ~QwtPlotItem () | 
|  | Destroy the QwtPlotItem. 
 | 
|  | 
| void | attach (QwtPlot *plot) | 
|  | Attach the item to a plot.  More... 
 | 
|  | 
| void | detach () | 
|  | This method detaches a QwtPlotItem from any QwtPlot it has been associated with.  More... 
 | 
|  | 
| QwtPlot * | plot () const | 
|  | Return attached plot. 
 | 
|  | 
| 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 | setItemInterest (ItemInterest, bool on=true) | 
|  | 
| bool | testItemInterest (ItemInterest) const | 
|  | 
| void | setRenderHint (RenderHint, bool on=true) | 
|  | 
| bool | testRenderHint (RenderHint) const | 
|  | 
| void | setRenderThreadCount (uint numThreads) | 
|  | 
| uint | renderThreadCount () const | 
|  | 
| void | setLegendIconSize (const QSize &) | 
|  | 
| QSize | legendIconSize () 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 | 
|  | 
| void | setAxes (int xAxis, int yAxis) | 
|  | 
| void | setXAxis (int axis) | 
|  | 
| int | xAxis () const | 
|  | Return xAxis. 
 | 
|  | 
| void | setYAxis (int axis) | 
|  | 
| int | yAxis () const | 
|  | Return yAxis. 
 | 
|  | 
| virtual void | itemChanged () | 
|  | 
| virtual void | legendChanged () | 
|  | 
| virtual void | getCanvasMarginHint (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &canvasSize, double &left, double &top, double &right, double &bottom) const | 
|  | Calculate a hint for the canvas margin.  More... 
 | 
|  | 
| virtual void | updateScaleDiv (const QwtScaleDiv &, const QwtScaleDiv &) | 
|  | Update the item to changes of the axes scale division.  More... 
 | 
|  | 
| virtual void | updateLegend (const QwtPlotItem *, const QList< QwtLegendData > &) | 
|  | Update the item to changes of the legend info.  More... 
 | 
|  | 
| QRectF | scaleRect (const QwtScaleMap &, const QwtScaleMap &) const | 
|  | Calculate the bounding scale rectangle of 2 maps.  More... 
 | 
|  | 
| QRectF | paintRect (const QwtScaleMap &, const QwtScaleMap &) const | 
|  | Calculate the bounding paint rectangle of 2 maps.  More... 
 | 
|  | 
| 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 | 
|  | 
|  | 
| virtual QImage | renderImage (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRectF &area, const QSize &imageSize) const | 
|  | Render an image from data and color map.  More... 
 | 
|  | 
| virtual QSize | contourRasterSize (const QRectF &, const QRect &) const | 
|  | Return the raster to be used by the CONREC contour algorithm.  More... 
 | 
|  | 
| virtual QwtRasterData::ContourLines | renderContourLines (const QRectF &rect, const QSize &raster) const | 
|  | 
| virtual void | drawContourLines (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtRasterData::ContourLines &lines) const | 
|  | 
| void | renderTile (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &imageRect, QImage *image) const | 
|  | Render a tile of an image.  More... 
 | 
|  | 
| virtual QwtScaleMap | imageMap (Qt::Orientation, const QwtScaleMap &map, const QRectF &area, const QSize &imageSize, double pixelSize) const | 
|  | Calculate a scale map for painting to an image.  More... 
 | 
|  | 
| QwtGraphic | defaultIcon (const QBrush &, const QSizeF &) const | 
|  | Return a default icon from a brush.  More... 
 | 
|  | 
A plot item, which displays a spectrogram. 
A spectrogram displays 3-dimensional data, where the 3rd dimension ( the intensity ) is displayed using colors. The colors are calculated from the values using a color map.
On multi-core systems the performance of the image composition can often be improved by dividing the area into tiles - each of them rendered in a different thread ( see QwtPlotItem::setRenderThreadCount() ).
In ContourMode contour lines are painted for the contour levels.
- See also
- QwtRasterData, QwtColorMap, QwtPlotItem::setRenderThreadCount()