qt_demoe/third/3rd_qwt/qwt_point_mapper.h

90 lines
2.6 KiB
C++

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_POINT_MAPPER_H
#define QWT_POINT_MAPPER_H
#include "qwt_global.h"
#include "qwt_series_data.h"
#include <qimage.h>
class QwtScaleMap;
class QPolygonF;
class QPolygon;
/*!
\brief 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>.
*/
class QWT_EXPORT QwtPointMapper
{
public:
/*!
\brief Flags affecting the transformation process
\sa setFlag(), setFlags()
*/
enum TransformationFlag
{
//! Round points to integer values
RoundPoints = 0x01,
/*!
Try to remove points, that are translated to the
same position.
*/
WeedOutPoints = 0x02
};
/*!
\brief Flags affecting the transformation process
\sa setFlag(), setFlags()
*/
typedef QFlags<TransformationFlag> TransformationFlags;
QwtPointMapper();
~QwtPointMapper();
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;
QPolygon toPolygon( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QwtSeriesData<QPointF> *series, int from, int to ) const;
QPolygon toPoints( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QwtSeriesData<QPointF> *series, int from, int to ) const;
QPolygonF toPointsF( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QwtSeriesData<QPointF> *series, int from, int to ) const;
QImage toImage( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QwtSeriesData<QPointF> *series, int from, int to,
const QPen &, bool antialiased, uint numThreads ) const;
private:
class PrivateData;
PrivateData *d_data;
};
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPointMapper::TransformationFlags )
#endif