qwt_matrix_raster_data.h

/******************************************************************************
 * 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
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_MATRIX_RASTER_DATA_H
#define QWT_MATRIX_RASTER_DATA_H
 
#include "qwt_global.h"
#include "qwt_raster_data.h"
 
#if QT_VERSION < 0x060000
template< typename T > class QVector;
#endif
 
class QWT_EXPORT QwtMatrixRasterData : public QwtRasterData
{
  public:
    enum ResampleMode
    {
        NearestNeighbour,
 
        BilinearInterpolation,
 
        BicubicInterpolation
    };
 
    // Constructor
    QwtMatrixRasterData();
    // Destructor
    virtual ~QwtMatrixRasterData();
 
    // Set the resampling algorithm
    void setResampleMode(ResampleMode mode);
    // Return the resampling algorithm
    ResampleMode resampleMode() const;
 
    // Assign the bounding interval for an axis
    void setInterval( Qt::Axis, const QwtInterval& );
    // Return bounding interval for an axis
    virtual QwtInterval interval( Qt::Axis axis) const override final;
 
    // Assign a value matrix
    void setValueMatrix( const QVector< double >& values, int numColumns );
    // Return value matrix
    const QVector< double > valueMatrix() const;
 
    // Change a single value in the matrix
    void setValue( int row, int col, double value );
 
    // Return number of columns of the value matrix
    int numColumns() const;
    // Return number of rows of the value matrix
    int numRows() const;
 
    // Calculate the pixel hint
    virtual QRectF pixelHint( const QRectF& ) const override;
 
    // Return the value at a raster position
    virtual double value( double x, double y ) const override;
 
  private:
    void update();
 
    class PrivateData;
    PrivateData* m_data;
};
 
#endif