NAME

       QwtPointMapper - A helper class for translating a series of points.

SYNOPSIS

       #include <qwt_point_mapper.h>

   Public Types
       enum TransformationFlag { RoundPoints = 0x01, WeedOutPoints = 0x02 }
           Flags affecting the transformation process.
       typedef QFlags< TransformationFlag > TransformationFlags
           Flags affecting the transformation process.

   Public Member Functions
       QwtPointMapper ()
           Constructor.
       ~QwtPointMapper ()
           Destructor.
       void setFlags (TransformationFlags)
       TransformationFlags flags () const
       void setFlag (TransformationFlag, bool on=true)
       bool testFlag (TransformationFlag) const
       void setBoundingRect (const QRectF &)
       QRectF boundingRect () const
       QPolygonF toPolygonF (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const
           QwtSeriesData< QPointF > *series, int from, int to) const
           Translate a series of points into a QPolygonF.
       QPolygon toPolygon (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtSeriesData<
           QPointF > *series, int from, int to) const
           Translate a series of points into a QPolygon.
       QPolygon toPoints (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtSeriesData<
           QPointF > *series, int from, int to) const
           Translate a series of points into a QPolygon.
       QPolygonF toPointsF (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const
           QwtSeriesData< QPointF > *series, int from, int to) const
           Translate a series into a QPolygonF.
       QImage toImage (const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QwtSeriesData<
           QPointF > *series, int from, int to, const QPen &, bool antialiased, uint numThreads)
           const
           Translate a series into a QImage.

Detailed Description

       A helper class for translating a series of points.

       QwtPointMapper is a collection of methods and optimizations for translating a series of
       points into paint device coordinates. It is used by QwtPlotCurve but might also be useful
       for similar plot items displaying a QwtSeriesData<QPointF>.

Member Typedef Documentation

   typedef QFlags<TransformationFlag> QwtPointMapper::TransformationFlags
       Flags affecting the transformation process.

       See also:
           setFlag(), setFlags()

Member Enumeration Documentation

   enum QwtPointMapper::TransformationFlag
       Flags affecting the transformation process.

       See also:
           setFlag(), setFlags()

       Enumerator

       RoundPoints
              Round points to integer values.

       WeedOutPoints
              Try to remove points, that are translated to the same position.

Member Function Documentation

   QRectF QwtPointMapper::boundingRect () const
       Returns:
           Bounding rectangle

       See also:
           setBoundingRect()

   QwtPointMapper::TransformationFlags QwtPointMapper::flags () const
       Returns:
           Flags affecting the transformation process

       See also:
           setFlags(), setFlag()

   void QwtPointMapper::setBoundingRect (const QRectF & rect)
       Set a bounding rectangle for the point mapping algorithm

       A valid bounding rectangle can be used for optimizations

       Parameters:
           rect Bounding rectangle

       See also:
           boundingRect()

   void QwtPointMapper::setFlag (TransformationFlag flag, bool on = true)
       Modify a flag affecting the transformation process

       Parameters:
           flag Flag type
           on Value

       See also:
           flag(), setFlags()

   void QwtPointMapper::setFlags (TransformationFlags flags)
       Set the flags affecting the transformation process

       Parameters:
           flags Flags

       See also:
           flags(), setFlag()

   bool QwtPointMapper::testFlag (TransformationFlag flag) const
       Returns:
           True, when the flag is set

       Parameters:
           flag Flag type

       See also:
           setFlag(), setFlags()

   QImage QwtPointMapper::toImage (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QwtSeriesData< QPointF > * series, int from, int to, const QPen & pen, bool antialiased,
       uint numThreads) const
       Translate a series into a QImage.

       Parameters:
           xMap x map
           yMap y map
           series Series of points to be mapped
           from Index of the first point to be painted
           to Index of the last point to be painted
           pen Pen used for drawing a point of the image, where a point is mapped to
           antialiased True, when the dots should be displayed antialiased
           numThreads Number of threads to be used for rendering. If numThreads is set to 0, the
           system specific ideal thread count is used.

       Returns:
           Image displaying the series

   QPolygon QwtPointMapper::toPoints (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QwtSeriesData< QPointF > * series, int from, int to) const
       Translate a series of points into a QPolygon.

       • WeedOutPoints & boundingRect().isValid() All points that are mapped to the same position
         will be one point. Points outside of the bounding rectangle are ignored.

       • WeedOutPoints & !boundingRect().isValid() All consecutive points that are mapped to the
         same position will one point

       • !WeedOutPoints & boundingRect().isValid() Points outside of the bounding rectangle are
         ignored.

       Parameters:
           xMap x map
           yMap y map
           series Series of points to be mapped
           from Index of the first point to be painted
           to Index of the last point to be painted

       Returns:
           Translated polygon

   QPolygonF QwtPointMapper::toPointsF (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QwtSeriesData< QPointF > * series, int from, int to) const
       Translate a series into a QPolygonF.

       • WeedOutPoints & RoundPoints & boundingRect().isValid() All points that are mapped to the
         same position will be one point. Points outside of the bounding rectangle are ignored.

       • WeedOutPoints & RoundPoints & !boundingRect().isValid() All consecutive points that are
         mapped to the same position will one point

       • WeedOutPoints & !RoundPoints All consecutive points that are mapped to the same position
         will one point

       • !WeedOutPoints & boundingRect().isValid() Points outside of the bounding rectangle are
         ignored.

       When RoundPoints is set all points are rounded to integers but returned as PolygonF - what
       only makes sense when the further processing of the values need a QPolygonF.

       Parameters:
           xMap x map
           yMap y map
           series Series of points to be mapped
           from Index of the first point to be painted
           to Index of the last point to be painted

       Returns:
           Translated polygon

   QPolygon QwtPointMapper::toPolygon (const QwtScaleMap & xMap, const QwtScaleMap & yMap, const
       QwtSeriesData< QPointF > * series, int from, int to) const
       Translate a series of points into a QPolygon. When the WeedOutPoints flag is enabled
       consecutive points, that are mapped to the same position will be one point.

       Parameters:
           xMap x map
           yMap y map
           series Series of points to be mapped
           from Index of the first point to be painted
           to Index of the last point to be painted

       Returns:
           Translated polygon

   QPolygonF QwtPointMapper::toPolygonF (const QwtScaleMap & xMap, const QwtScaleMap & yMap,
       const QwtSeriesData< QPointF > * series, int from, int to) const
       Translate a series of points into a QPolygonF. When the WeedOutPoints flag is enabled
       consecutive points, that are mapped to the same position will be one point.

       When RoundPoints is set all points are rounded to integers but returned as PolygonF - what
       only makes sense when the further processing of the values need a QPolygonF.

       Parameters:
           xMap x map
           yMap y map
           series Series of points to be mapped
           from Index of the first point to be painted
           to Index of the last point to be painted

       Returns:
           Translated polygon

Author

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