qt_demoe/third/3rd_qwt/qwt_matrix_raster_data.h

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/* -*- 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_MATRIX_RASTER_DATA_H
#define QWT_MATRIX_RASTER_DATA_H 1
#include "qwt_global.h"
#include "qwt_raster_data.h"
#include <qvector.h>
/*!
\brief A class representing a matrix of values as raster data
QwtMatrixRasterData implements an interface for a matrix of
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equidistant values, that can be used by a QwtPlotRasterItem.
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It implements a couple of resampling algorithms, to provide
values for positions, that or not on the value matrix.
*/
class QWT_EXPORT QwtMatrixRasterData: public QwtRasterData
{
public:
/*!
\brief Resampling algorithm
The default setting is NearestNeighbour;
*/
enum ResampleMode
{
/*!
Return the value from the matrix, that is nearest to the
the requested position.
*/
NearestNeighbour,
/*!
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Interpolate the value from the distances and values of the
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4 surrounding values in the matrix,
*/
BilinearInterpolation
};
QwtMatrixRasterData();
virtual ~QwtMatrixRasterData();
void setResampleMode(ResampleMode mode);
ResampleMode resampleMode() const;
virtual void setInterval( Qt::Axis, const QwtInterval & );
void setValueMatrix( const QVector<double> &values, int numColumns );
const QVector<double> valueMatrix() const;
void setValue( int row, int col, double value );
int numColumns() const;
int numRows() const;
virtual QRectF pixelHint( const QRectF & ) const;
virtual double value( double x, double y ) const;
private:
void update();
class PrivateData;
PrivateData *d_data;
};
#endif