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33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
/******************************************************************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_POINT_MAPPER_H
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#define QWT_POINT_MAPPER_H
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#include "qwt_global.h"
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class QwtScaleMap;
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template< typename T > class QwtSeriesData;
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class QPolygonF;
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class QPointF;
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class QRectF;
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class QPolygon;
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class QPen;
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class QImage;
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/*!
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\brief A helper class for translating a series of points
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QwtPointMapper is a collection of methods and optimizations
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for translating a series of points into paint device coordinates.
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It is used by QwtPlotCurve but might also be useful for
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similar plot items displaying a QwtSeriesData<QPointF>.
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*/
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class QWT_EXPORT QwtPointMapper
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{
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public:
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/*!
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\brief Flags affecting the transformation process
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\sa setFlag(), setFlags()
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*/
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enum TransformationFlag
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{
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//! Round points to integer values
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RoundPoints = 0x01,
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/*!
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Try to remove points, that are translated to the
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same position.
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*/
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WeedOutPoints = 0x02,
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/*!
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An even more aggressive weeding algorithm, that
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can be used in toPolygon().
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A consecutive chunk of points being mapped to the
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same x coordinate is reduced to 4 points:
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- first point
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- point with the minimum y coordinate
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- point with the maximum y coordinate
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- last point
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In the worst case ( first and last points are never one of the extremes )
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the number of points will be 4 times the width.
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As the algorithm is fast it can be used inside of
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a polyline render cycle.
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*/
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WeedOutIntermediatePoints = 0x04
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};
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Q_DECLARE_FLAGS( TransformationFlags, TransformationFlag )
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QwtPointMapper();
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~QwtPointMapper();
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void setFlags( TransformationFlags );
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TransformationFlags flags() const;
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void setFlag( TransformationFlag, bool on = true );
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bool testFlag( TransformationFlag ) const;
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void setBoundingRect( const QRectF& );
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QRectF boundingRect() const;
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QPolygonF toPolygonF( const QwtScaleMap& xMap, const QwtScaleMap& yMap,
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const QwtSeriesData< QPointF >* series, int from, int to ) const;
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QPolygon toPolygon( const QwtScaleMap& xMap, const QwtScaleMap& yMap,
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const QwtSeriesData< QPointF >* series, int from, int to ) const;
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QPolygon toPoints( const QwtScaleMap& xMap, const QwtScaleMap& yMap,
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const QwtSeriesData< QPointF >* series, int from, int to ) const;
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QPolygonF toPointsF( const QwtScaleMap& xMap, const QwtScaleMap& yMap,
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const QwtSeriesData< QPointF >* series, int from, int to ) const;
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QImage toImage( const QwtScaleMap& xMap, const QwtScaleMap& yMap,
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const QwtSeriesData< QPointF >* series, int from, int to,
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const QPen&, bool antialiased, uint numThreads ) const;
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private:
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Q_DISABLE_COPY(QwtPointMapper)
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class PrivateData;
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PrivateData* m_data;
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};
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPointMapper::TransformationFlags )
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#endif
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