bionic (3) QwtPointMapper.3.gz
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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