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Diffstat (limited to 'src/libpcp_qwt/src/qwt_color_map.h')
-rw-r--r-- | src/libpcp_qwt/src/qwt_color_map.h | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/src/libpcp_qwt/src/qwt_color_map.h b/src/libpcp_qwt/src/qwt_color_map.h new file mode 100644 index 0000000..e754830 --- /dev/null +++ b/src/libpcp_qwt/src/qwt_color_map.h @@ -0,0 +1,198 @@ +/* -*- 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_COLOR_MAP_H +#define QWT_COLOR_MAP_H + +#include "qwt_global.h" +#include "qwt_interval.h" +#include <qcolor.h> +#include <qvector.h> + +/*! + \brief QwtColorMap is used to map values into colors. + + For displaying 3D data on a 2D plane the 3rd dimension is often + displayed using colors, like f.e in a spectrogram. + + Each color map is optimized to return colors for only one of the + following image formats: + + - QImage::Format_Indexed8\n + - QImage::Format_ARGB32\n + + \sa QwtPlotSpectrogram, QwtScaleWidget +*/ + +class QWT_EXPORT QwtColorMap +{ +public: + /*! + Format for color mapping + \sa rgb(), colorIndex(), colorTable() + */ + + enum Format + { + //! The map is intended to map into QRgb values. + RGB, + + /*! + The map is intended to map into 8 bit values, that + are indices into the color table. + */ + Indexed + }; + + QwtColorMap( Format = QwtColorMap::RGB ); + virtual ~QwtColorMap(); + + Format format() const; + + /*! + Map a value of a given interval into a rgb value. + \param interval Range for the values + \param value Value + \return rgb value, corresponding to value + */ + virtual QRgb rgb( const QwtInterval &interval, + double value ) const = 0; + + /*! + Map a value of a given interval into a color index + \param interval Range for the values + \param value Value + \return color index, corresponding to value + */ + virtual unsigned char colorIndex( + const QwtInterval &interval, double value ) const = 0; + + QColor color( const QwtInterval &, double value ) const; + virtual QVector<QRgb> colorTable( const QwtInterval & ) const; + +private: + Format d_format; +}; + +/*! + \brief QwtLinearColorMap builds a color map from color stops. + + A color stop is a color at a specific position. The valid + range for the positions is [0.0, 1.0]. When mapping a value + into a color it is translated into this interval according to mode(). +*/ +class QWT_EXPORT QwtLinearColorMap: public QwtColorMap +{ +public: + /*! + Mode of color map + \sa setMode(), mode() + */ + enum Mode + { + //! Return the color from the next lower color stop + FixedColors, + + //! Interpolating the colors of the adjacent stops. + ScaledColors + }; + + QwtLinearColorMap( QwtColorMap::Format = QwtColorMap::RGB ); + QwtLinearColorMap( const QColor &from, const QColor &to, + QwtColorMap::Format = QwtColorMap::RGB ); + + virtual ~QwtLinearColorMap(); + + void setMode( Mode ); + Mode mode() const; + + void setColorInterval( const QColor &color1, const QColor &color2 ); + void addColorStop( double value, const QColor& ); + QVector<double> colorStops() const; + + QColor color1() const; + QColor color2() const; + + virtual QRgb rgb( const QwtInterval &, double value ) const; + virtual unsigned char colorIndex( + const QwtInterval &, double value ) const; + + class ColorStops; + +private: + // Disabled copy constructor and operator= + QwtLinearColorMap( const QwtLinearColorMap & ); + QwtLinearColorMap &operator=( const QwtLinearColorMap & ); + + class PrivateData; + PrivateData *d_data; +}; + +/*! + \brief QwtAlphaColorMap variies the alpha value of a color +*/ +class QWT_EXPORT QwtAlphaColorMap: public QwtColorMap +{ +public: + QwtAlphaColorMap( const QColor & = QColor( Qt::gray ) ); + virtual ~QwtAlphaColorMap(); + + void setColor( const QColor & ); + QColor color() const; + + virtual QRgb rgb( const QwtInterval &, double value ) const; + +private: + QwtAlphaColorMap( const QwtAlphaColorMap & ); + QwtAlphaColorMap &operator=( const QwtAlphaColorMap & ); + + virtual unsigned char colorIndex( + const QwtInterval &, double value ) const; + + class PrivateData; + PrivateData *d_data; +}; + + +/*! + Map a value into a color + + \param interval Valid interval for values + \param value Value + + \return Color corresponding to value + + \warning This method is slow for Indexed color maps. If it is + necessary to map many values, its better to get the + color table once and find the color using colorIndex(). +*/ +inline QColor QwtColorMap::color( + const QwtInterval &interval, double value ) const +{ + if ( d_format == RGB ) + { + return QColor( rgb( interval, value ) ); + } + else + { + const unsigned int index = colorIndex( interval, value ); + return colorTable( interval )[index]; // slow + } +} + +/*! + \return Intended format of the color map + \sa Format +*/ +inline QwtColorMap::Format QwtColorMap::format() const +{ + return d_format; +} + +#endif |