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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
130 lines
3.6 KiB
C++
130 lines
3.6 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_RASTER_DATA_H
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#define QWT_RASTER_DATA_H
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#include "qwt_global.h"
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#include <qnamespace.h>
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class QwtInterval;
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class QPolygonF;
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class QRectF;
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class QSize;
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template< typename T > class QList;
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template< class Key, class T > class QMap;
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/*!
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\brief QwtRasterData defines an interface to any type of raster data.
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QwtRasterData is an abstract interface, that is used by
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QwtPlotRasterItem to find the values at the pixels of its raster.
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Gaps inside the bounding rectangle of the data can be indicated by NaN
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values ( when WithoutGaps is disabled ).
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Often a raster item is used to display values from a matrix. Then the
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derived raster data class needs to implement some sort of resampling,
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that maps the raster of the matrix into the requested raster of
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the raster item ( depending on resolution and scales of the canvas ).
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QwtMatrixRasterData implements raster data, that returns values from
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a given 2D matrix.
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\sa QwtMatrixRasterData
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*/
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class QWT_EXPORT QwtRasterData
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{
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public:
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//! Contour lines
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typedef QMap< double, QPolygonF > ContourLines;
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/*!
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\brief Raster data attributes
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Additional information that is used to improve processing
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of the data.
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*/
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enum Attribute
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{
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/*!
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The bounding rectangle of the data is spanned by
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the interval(Qt::XAxis) and interval(Qt::YAxis).
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WithoutGaps indicates, that the data has no gaps
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( unknown values ) in this area and the result of
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value() does not need to be checked for NaN values.
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Enabling this flag will have an positive effect on
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the performance of rendering a QwtPlotSpectrogram.
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The default setting is false.
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\note NaN values indicate an undefined value
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*/
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WithoutGaps = 0x01
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};
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Q_DECLARE_FLAGS( Attributes, Attribute )
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//! Flags to modify the contour algorithm
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enum ConrecFlag
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{
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//! Ignore all vertices on the same level
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IgnoreAllVerticesOnLevel = 0x01,
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//! Ignore all values, that are out of range
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IgnoreOutOfRange = 0x02
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};
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Q_DECLARE_FLAGS( ConrecFlags, ConrecFlag )
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QwtRasterData();
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virtual ~QwtRasterData();
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void setAttribute( Attribute, bool on = true );
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bool testAttribute( Attribute ) const;
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/*!
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\return Bounding interval for an axis
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\sa setInterval
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*/
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virtual QwtInterval interval( Qt::Axis ) const = 0;
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virtual QRectF pixelHint( const QRectF& ) const;
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virtual void initRaster( const QRectF&, const QSize& raster );
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virtual void discardRaster();
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/*!
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\return the value at a raster position
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\param x X value in plot coordinates
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\param y Y value in plot coordinates
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*/
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virtual double value( double x, double y ) const = 0;
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virtual ContourLines contourLines( const QRectF& rect,
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const QSize& raster, const QList< double >& levels,
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ConrecFlags ) const;
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class Contour3DPoint;
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class ContourPlane;
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private:
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Q_DISABLE_COPY(QwtRasterData)
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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( QwtRasterData::ConrecFlags )
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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::Attributes )
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#endif
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