Definition at line 53 of file qwt_raster_data.h.
Public Types | |
typedef QMap< double, QPolygonF > | ContourLines |
enum | ConrecAttribute { IgnoreAllVerticesOnLevel = 1, IgnoreOutOfRange = 2 } |
Public Member Functions | |
QwtRasterData () | |
QwtRasterData (const QwtDoubleRect &) | |
virtual | ~QwtRasterData () |
virtual QwtRasterData * | copy () const =0 |
virtual void | setBoundingRect (const QwtDoubleRect &) |
QwtDoubleRect | boundingRect () const |
virtual QSize | rasterHint (const QwtDoubleRect &) const |
virtual void | initRaster (const QwtDoubleRect &, const QSize &raster) |
virtual void | discardRaster () |
virtual double | value (double x, double y) const =0 |
virtual QwtDoubleInterval | range () const =0 |
virtual ContourLines | contourLines (const QwtDoubleRect &rect, const QSize &raster, const QList< double > &levels, int flags) const |
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Calculate contour lines An adaption of CONREC, a simple contouring algorithm. http://astronomy.swin.edu.au/~pbourke/projection/conrec Definition at line 270 of file qwt_raster_data.cpp. References QwtDoubleInterval::isValid(). |
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Clone the data.
Referenced by QwtPlotSpectrogram::setData(). |
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Discard a raster. After the composition of an image QwtPlotSpectrogram calls discardRaster(). The default implementation does nothing, but if data has been loaded in initRaster(), it could deleted now.
Definition at line 236 of file qwt_raster_data.cpp. |
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Initialize a raster. Before the composition of an image QwtPlotSpectrogram calls initRaster, announcing the area and its resolution that will be requested. The default implementation does nothing, but for data sets that are stored in files, it might be good idea to reimplement initRaster, where the data is resampled and loaded into memory.
Definition at line 222 of file qwt_raster_data.cpp. |
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Find the raster of the data for an area. The resolution is the number of horizontal and vertical pixels that the data can return for an area. An invalid resolution indicates that the data can return values for any detail level. The resolution will limit the size of the image that is rendered from the data. F.e. this might be important when printing a spectrogram to a A0 printer with 600 dpi. The default implementation returns an invalid resolution (size)
Definition at line 258 of file qwt_raster_data.cpp. |
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