qwtseriesdata(3) [debian man page]
QwtSeriesData(3) Qwt User's Guide QwtSeriesData(3) NAME
QwtSeriesData - Abstract interface for iterating over samples. SYNOPSIS
#include <qwt_series_data.h> Inherited by QwtArraySeriesData< T >. Public Member Functions QwtSeriesData () virtual ~QwtSeriesData () virtual size_t size () const =0 virtual T sample (size_t i) const =0 virtual QRectF boundingRect () const =0 virtual void setRectOfInterest (const QRectF &) Protected Attributes QRectF d_boundingRect Detailed Description template<typename T> class QwtSeriesData< T > Abstract interface for iterating over samples. Qwt offers several implementations of the QwtSeriesData API, but in situations, where data of an application specific format needs to be displayed, without having to copy it, it is recommended to implement an individual data access. Constructor &; Destructor Documentation template<typename T > QwtSeriesData< T >::QwtSeriesData () Constructor. template<typename T > QwtSeriesData< T >::~QwtSeriesData () [virtual] Destructor. Member Function Documentation template<typename T> virtual QRectF QwtSeriesData< T >::boundingRect () const [pure virtual] Calculate the bounding rect of all samples The bounding rect is necessary for autoscaling and can be used for a couple of painting optimizations. qwtBoundingRect(...) offers slow implementations iterating over the samples. For large sets it is recommended to implement something faster f.e. by caching the bounding rect. Implemented in QwtPointSeriesData, QwtPoint3DSeriesData, QwtIntervalSeriesData, QwtSetSeriesData, QwtPointArrayData, QwtCPointerData, and QwtSyntheticPointData. template<typename T> virtual T QwtSeriesData< T >::sample (size_ti) const [pure virtual] Return a sample Parameters: i Index Returns: Sample at position i Implemented in QwtArraySeriesData< T >, QwtPointArrayData, QwtCPointerData, QwtSyntheticPointData, QwtArraySeriesData< QwtIntervalSample >, QwtArraySeriesData< QPointF >, QwtArraySeriesData< QwtPoint3D >, and QwtArraySeriesData< QwtSetSample >. template<typename T > void QwtSeriesData< T >::setRectOfInterest (const QRectF &) [virtual] Set a the 'rect of interest' QwtPlotSeriesItem defines the current area of the plot canvas as 'rect of interest' ( QwtPlotSeriesItem::updateScaleDiv() ). It can be used to implement different levels of details. The default implementation does nothing. Reimplemented in QwtSyntheticPointData. template<typename T> virtual size_t QwtSeriesData< T >::size () const [pure virtual] Returns: Number of samples Implemented in QwtArraySeriesData< T >, QwtPointArrayData, QwtCPointerData, QwtSyntheticPointData, QwtArraySeriesData< QwtIntervalSample >, QwtArraySeriesData< QPointF >, QwtArraySeriesData< QwtPoint3D >, and QwtArraySeriesData< QwtSetSample >. Member Data Documentation template<typename T> QRectF QwtSeriesData< T >::d_boundingRect [mutable, protected] Can be used to cache a calculated bounding rectangle. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.0.0 Fri Apr 15 2011 QwtSeriesData(3)
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QwtNullPaintDevice(3) Qwt User's Guide QwtNullPaintDevice(3) NAME
QwtNullPaintDevice - A null paint device doing nothing. SYNOPSIS
#include <qwt_null_paintdevice.h> Inherited by QwtStyleSheetRecorder. Public Member Functions QwtNullPaintDevice (QPaintEngine::PaintEngineFeatures) QwtNullPaintDevice (const QSize &size, QPaintEngine::PaintEngineFeatures) virtual ~QwtNullPaintDevice () void setSize (const QSize &) QSize size () const virtual QPaintEngine * paintEngine () const virtual int metric (PaintDeviceMetric metric) const virtual void drawRects (const QRect *, int) virtual void drawRects (const QRectF *, int) virtual void drawLines (const QLine *, int) virtual void drawLines (const QLineF *, int) virtual void drawEllipse (const QRectF &) virtual void drawEllipse (const QRect &) virtual void drawPath (const QPainterPath &) virtual void drawPoints (const QPointF *, int) virtual void drawPoints (const QPoint *, int) virtual void drawPolygon (const QPointF *, int, QPaintEngine::PolygonDrawMode) virtual void drawPolygon (const QPoint *, int, QPaintEngine::PolygonDrawMode) virtual void drawPixmap (const QRectF &, const QPixmap &, const QRectF &) virtual void drawTextItem (const QPointF &, const QTextItem &) virtual void drawTiledPixmap (const QRectF &, const QPixmap &, const QPointF &s) virtual void drawImage (const QRectF &, const QImage &, const QRectF &, Qt::ImageConversionFlags) virtual void updateState (const QPaintEngineState &state) Detailed Description A null paint device doing nothing. Sometimes important layout/rendering geometries are not available or changable from the public Qt class interface. ( f.e hidden in the style implementation ). QwtNullPaintDevice can be used to manipulate or filter out these informations by analyzing the stream of paint primitives. F.e. QwtNullPaintDevice is used by QwtPlotCanvas to identify styled backgrounds with rounded corners. Constructor &; Destructor Documentation QwtNullPaintDevice::QwtNullPaintDevice (QPaintEngine::PaintEngineFeaturesfeatures) Constructor. QwtNullPaintDevice::QwtNullPaintDevice (const QSize &size, QPaintEngine::PaintEngineFeaturesfeatures) Constructor. QwtNullPaintDevice::~QwtNullPaintDevice () [virtual] Destructor. Member Function Documentation void QwtNullPaintDevice::drawEllipse (const QRectF &rect) [virtual] See QPaintEngine::drawEllipse() void QwtNullPaintDevice::drawEllipse (const QRect &rect) [virtual] See QPaintEngine::drawEllipse() void QwtNullPaintDevice::drawImage (const QRectF &rect, const QImage &image, const QRectF &subRect, Qt::ImageConversionFlagsflags) [virtual] See QPaintEngine::drawImage() void QwtNullPaintDevice::drawLines (const QLineF *lines, intlineCount) [virtual] See QPaintEngine::drawLines() void QwtNullPaintDevice::drawLines (const QLine *lines, intlineCount) [virtual] See QPaintEngine::drawLines() void QwtNullPaintDevice::drawPath (const QPainterPath &path) [virtual] See QPaintEngine::drawPath() void QwtNullPaintDevice::drawPixmap (const QRectF &rect, const QPixmap &pm, const QRectF &subRect) [virtual] See QPaintEngine::drawPixmap() void QwtNullPaintDevice::drawPoints (const QPointF *points, intpointCount) [virtual] See QPaintEngine::drawPoints() void QwtNullPaintDevice::drawPoints (const QPoint *points, intpointCount) [virtual] See QPaintEngine::drawPoints() void QwtNullPaintDevice::drawPolygon (const QPoint *points, intpointCount, QPaintEngine::PolygonDrawModemode) [virtual] See QPaintEngine::drawPolygon() void QwtNullPaintDevice::drawPolygon (const QPointF *points, intpointCount, QPaintEngine::PolygonDrawModemode) [virtual] See QPaintEngine::drawPolygon() void QwtNullPaintDevice::drawRects (const QRectF *rects, intrectCount) [virtual] See QPaintEngine::drawRects() void QwtNullPaintDevice::drawRects (const QRect *rects, intrectCount) [virtual] See QPaintEngine::drawRects() void QwtNullPaintDevice::drawTextItem (const QPointF &pos, const QTextItem &textItem) [virtual] See QPaintEngine::drawTextItem() void QwtNullPaintDevice::drawTiledPixmap (const QRectF &rect, const QPixmap &pixmap, const QPointF &s) [virtual] See QPaintEngine::drawTiledPixmap() int QwtNullPaintDevice::metric (PaintDeviceMetricmetric) const [virtual] See QPaintDevice::metric() See also: setSize() QPaintEngine * QwtNullPaintDevice::paintEngine () const [virtual] See QPaintDevice::paintEngine() void QwtNullPaintDevice::setSize (const QSize &size) Set the size of the paint device Parameters: size Size See also: size() QSize QwtNullPaintDevice::size () const Returns: Size of the paint device See also: setSize() void QwtNullPaintDevice::updateState (const QPaintEngineState &state) [virtual] See QPaintEngine::updateState() Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.0.0 Fri Apr 15 2011 QwtNullPaintDevice(3)