[4271] | 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #include "qwt_color_map.h"
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| 11 | #include "qwt_math.h"
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| 12 | #include "qwt_interval.h"
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| 13 | #include <qnumeric.h>
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| 14 |
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| 15 | class QwtLinearColorMap::ColorStops
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| 16 | {
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| 17 | public:
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| 18 | ColorStops()
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| 19 | {
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| 20 | _stops.reserve( 256 );
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| 21 | }
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| 22 |
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| 23 | void insert( double pos, const QColor &color );
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| 24 | QRgb rgb( QwtLinearColorMap::Mode, double pos ) const;
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| 25 |
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| 26 | QVector<double> stops() const;
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| 27 |
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| 28 | private:
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| 29 |
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| 30 | class ColorStop
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| 31 | {
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| 32 | public:
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| 33 | ColorStop():
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| 34 | pos( 0.0 ),
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| 35 | rgb( 0 )
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| 36 | {
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| 37 | };
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| 38 |
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| 39 | ColorStop( double p, const QColor &c ):
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| 40 | pos( p ),
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| 41 | rgb( c.rgb() )
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| 42 | {
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| 43 | r = qRed( rgb );
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| 44 | g = qGreen( rgb );
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| 45 | b = qBlue( rgb );
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| 46 | }
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| 47 |
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| 48 | double pos;
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| 49 | QRgb rgb;
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| 50 | int r, g, b;
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| 51 | };
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| 52 |
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| 53 | inline int findUpper( double pos ) const;
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| 54 | QVector<ColorStop> _stops;
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| 55 | };
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| 56 |
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| 57 | void QwtLinearColorMap::ColorStops::insert( double pos, const QColor &color )
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| 58 | {
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| 59 | // Lookups need to be very fast, insertions are not so important.
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| 60 | // Anyway, a balanced tree is what we need here. TODO ...
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| 61 |
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| 62 | if ( pos < 0.0 || pos > 1.0 )
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| 63 | return;
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| 64 |
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| 65 | int index;
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| 66 | if ( _stops.size() == 0 )
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| 67 | {
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| 68 | index = 0;
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| 69 | _stops.resize( 1 );
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| 70 | }
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| 71 | else
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| 72 | {
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| 73 | index = findUpper( pos );
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| 74 | if ( index == _stops.size() ||
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| 75 | qAbs( _stops[index].pos - pos ) >= 0.001 )
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| 76 | {
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| 77 | _stops.resize( _stops.size() + 1 );
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| 78 | for ( int i = _stops.size() - 1; i > index; i-- )
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| 79 | _stops[i] = _stops[i-1];
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | _stops[index] = ColorStop( pos, color );
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| 84 | }
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| 85 |
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| 86 | inline QVector<double> QwtLinearColorMap::ColorStops::stops() const
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| 87 | {
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| 88 | QVector<double> positions( _stops.size() );
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| 89 | for ( int i = 0; i < _stops.size(); i++ )
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| 90 | positions[i] = _stops[i].pos;
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| 91 | return positions;
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| 92 | }
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| 93 |
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| 94 | inline int QwtLinearColorMap::ColorStops::findUpper( double pos ) const
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| 95 | {
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| 96 | int index = 0;
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| 97 | int n = _stops.size();
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| 98 |
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| 99 | const ColorStop *stops = _stops.data();
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| 100 |
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| 101 | while ( n > 0 )
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| 102 | {
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| 103 | const int half = n >> 1;
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| 104 | const int middle = index + half;
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| 105 |
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| 106 | if ( stops[middle].pos <= pos )
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| 107 | {
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| 108 | index = middle + 1;
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| 109 | n -= half + 1;
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| 110 | }
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| 111 | else
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| 112 | n = half;
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| 113 | }
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| 114 |
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| 115 | return index;
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| 116 | }
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| 117 |
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| 118 | inline QRgb QwtLinearColorMap::ColorStops::rgb(
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| 119 | QwtLinearColorMap::Mode mode, double pos ) const
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| 120 | {
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| 121 | if ( pos <= 0.0 )
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| 122 | return _stops[0].rgb;
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| 123 | if ( pos >= 1.0 )
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| 124 | return _stops[ _stops.size() - 1 ].rgb;
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| 125 |
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| 126 | const int index = findUpper( pos );
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| 127 | if ( mode == FixedColors )
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| 128 | {
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| 129 | return _stops[index-1].rgb;
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| 130 | }
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| 131 | else
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| 132 | {
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| 133 | const ColorStop &s1 = _stops[index-1];
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| 134 | const ColorStop &s2 = _stops[index];
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| 135 |
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| 136 | const double ratio = ( pos - s1.pos ) / ( s2.pos - s1.pos );
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| 137 |
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| 138 | const int r = s1.r + qRound( ratio * ( s2.r - s1.r ) );
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| 139 | const int g = s1.g + qRound( ratio * ( s2.g - s1.g ) );
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| 140 | const int b = s1.b + qRound( ratio * ( s2.b - s1.b ) );
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| 141 |
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| 142 | return qRgb( r, g, b );
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| 143 | }
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| 144 | }
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| 145 |
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| 146 | //! Constructor
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| 147 | QwtColorMap::QwtColorMap( Format format ):
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| 148 | d_format( format )
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| 149 | {
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| 150 | }
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| 151 |
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| 152 | //! Destructor
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| 153 | QwtColorMap::~QwtColorMap()
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| 154 | {
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| 155 | }
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| 156 |
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| 157 | /*!
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| 158 | Build and return a color map of 256 colors
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| 159 |
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| 160 | The color table is needed for rendering indexed images in combination
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| 161 | with using colorIndex().
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| 162 |
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| 163 | \param interval Range for the values
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| 164 | \return A color table, that can be used for a QImage
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| 165 | */
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| 166 | QVector<QRgb> QwtColorMap::colorTable( const QwtInterval &interval ) const
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| 167 | {
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| 168 | QVector<QRgb> table( 256 );
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| 169 |
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| 170 | if ( interval.isValid() )
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| 171 | {
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| 172 | const double step = interval.width() / ( table.size() - 1 );
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| 173 | for ( int i = 0; i < table.size(); i++ )
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| 174 | table[i] = rgb( interval, interval.minValue() + step * i );
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| 175 | }
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| 176 |
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| 177 | return table;
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| 178 | }
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| 179 |
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| 180 | class QwtLinearColorMap::PrivateData
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| 181 | {
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| 182 | public:
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| 183 | ColorStops colorStops;
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| 184 | QwtLinearColorMap::Mode mode;
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| 185 | };
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| 186 |
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| 187 | /*!
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| 188 | Build a color map with two stops at 0.0 and 1.0. The color
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| 189 | at 0.0 is Qt::blue, at 1.0 it is Qt::yellow.
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| 190 |
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| 191 | \param format Preferred format of the color map
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| 192 | */
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| 193 | QwtLinearColorMap::QwtLinearColorMap( QwtColorMap::Format format ):
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| 194 | QwtColorMap( format )
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| 195 | {
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| 196 | d_data = new PrivateData;
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| 197 | d_data->mode = ScaledColors;
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| 198 |
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| 199 | setColorInterval( Qt::blue, Qt::yellow );
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| 200 | }
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| 201 |
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| 202 | /*!
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| 203 | Build a color map with two stops at 0.0 and 1.0.
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| 204 |
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| 205 | \param color1 Color used for the minimum value of the value interval
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| 206 | \param color2 Color used for the maximum value of the value interval
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| 207 | \param format Preferred format of the coor map
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| 208 | */
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| 209 | QwtLinearColorMap::QwtLinearColorMap( const QColor &color1,
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| 210 | const QColor &color2, QwtColorMap::Format format ):
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| 211 | QwtColorMap( format )
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| 212 | {
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| 213 | d_data = new PrivateData;
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| 214 | d_data->mode = ScaledColors;
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| 215 | setColorInterval( color1, color2 );
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| 216 | }
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| 217 |
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| 218 | //! Destructor
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| 219 | QwtLinearColorMap::~QwtLinearColorMap()
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| 220 | {
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| 221 | delete d_data;
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| 222 | }
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| 223 |
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| 224 | /*!
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| 225 | \brief Set the mode of the color map
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| 226 |
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| 227 | FixedColors means the color is calculated from the next lower
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| 228 | color stop. ScaledColors means the color is calculated
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| 229 | by interpolating the colors of the adjacent stops.
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| 230 |
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| 231 | \sa mode()
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| 232 | */
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| 233 | void QwtLinearColorMap::setMode( Mode mode )
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| 234 | {
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| 235 | d_data->mode = mode;
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| 236 | }
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| 237 |
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| 238 | /*!
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| 239 | \return Mode of the color map
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| 240 | \sa setMode()
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| 241 | */
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| 242 | QwtLinearColorMap::Mode QwtLinearColorMap::mode() const
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| 243 | {
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| 244 | return d_data->mode;
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| 245 | }
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| 246 |
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| 247 | /*!
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| 248 | Set the color range
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| 249 |
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| 250 | Add stops at 0.0 and 1.0.
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| 251 |
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| 252 | \param color1 Color used for the minimum value of the value interval
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| 253 | \param color2 Color used for the maximum value of the value interval
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| 254 |
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| 255 | \sa color1(), color2()
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| 256 | */
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| 257 | void QwtLinearColorMap::setColorInterval(
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| 258 | const QColor &color1, const QColor &color2 )
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| 259 | {
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| 260 | d_data->colorStops = ColorStops();
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| 261 | d_data->colorStops.insert( 0.0, color1 );
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| 262 | d_data->colorStops.insert( 1.0, color2 );
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| 263 | }
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| 264 |
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| 265 | /*!
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| 266 | Add a color stop
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| 267 |
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| 268 | The value has to be in the range [0.0, 1.0].
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| 269 | F.e. a stop at position 17.0 for a range [10.0,20.0] must be
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| 270 | passed as: (17.0 - 10.0) / (20.0 - 10.0)
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| 271 |
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| 272 | \param value Value between [0.0, 1.0]
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| 273 | \param color Color stop
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| 274 | */
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| 275 | void QwtLinearColorMap::addColorStop( double value, const QColor& color )
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| 276 | {
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| 277 | if ( value >= 0.0 && value <= 1.0 )
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| 278 | d_data->colorStops.insert( value, color );
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| 279 | }
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| 280 |
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| 281 | /*!
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| 282 | Return all positions of color stops in increasing order
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| 283 | */
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| 284 | QVector<double> QwtLinearColorMap::colorStops() const
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| 285 | {
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| 286 | return d_data->colorStops.stops();
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| 287 | }
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| 288 |
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| 289 | /*!
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| 290 | \return the first color of the color range
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| 291 | \sa setColorInterval()
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| 292 | */
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| 293 | QColor QwtLinearColorMap::color1() const
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| 294 | {
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| 295 | return QColor( d_data->colorStops.rgb( d_data->mode, 0.0 ) );
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| 296 | }
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| 297 |
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| 298 | /*!
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| 299 | \return the second color of the color range
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| 300 | \sa setColorInterval()
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| 301 | */
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| 302 | QColor QwtLinearColorMap::color2() const
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| 303 | {
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| 304 | return QColor( d_data->colorStops.rgb( d_data->mode, 1.0 ) );
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| 305 | }
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| 306 |
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| 307 | /*!
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| 308 | Map a value of a given interval into a rgb value
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| 309 |
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| 310 | \param interval Range for all values
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| 311 | \param value Value to map into a rgb value
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| 312 | */
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| 313 | QRgb QwtLinearColorMap::rgb(
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| 314 | const QwtInterval &interval, double value ) const
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| 315 | {
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| 316 | if ( qIsNaN(value) )
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| 317 | return qRgba(0, 0, 0, 0);
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| 318 |
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| 319 | const double width = interval.width();
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| 320 |
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| 321 | double ratio = 0.0;
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| 322 | if ( width > 0.0 )
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| 323 | ratio = ( value - interval.minValue() ) / width;
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| 324 |
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| 325 | return d_data->colorStops.rgb( d_data->mode, ratio );
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| 326 | }
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| 327 |
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| 328 | /*!
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| 329 | Map a value of a given interval into a color index, between 0 and 255
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| 330 |
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| 331 | \param interval Range for all values
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| 332 | \param value Value to map into a color index
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| 333 | */
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| 334 | unsigned char QwtLinearColorMap::colorIndex(
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| 335 | const QwtInterval &interval, double value ) const
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| 336 | {
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| 337 | const double width = interval.width();
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| 338 |
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| 339 | if ( qIsNaN(value) || width <= 0.0 || value <= interval.minValue() )
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| 340 | return 0;
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| 341 |
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| 342 | if ( value >= interval.maxValue() )
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| 343 | return ( unsigned char )255;
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| 344 |
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| 345 | const double ratio = ( value - interval.minValue() ) / width;
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| 346 |
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| 347 | unsigned char index;
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| 348 | if ( d_data->mode == FixedColors )
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| 349 | index = ( unsigned char )( ratio * 255 ); // always floor
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| 350 | else
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| 351 | index = ( unsigned char )qRound( ratio * 255 );
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| 352 |
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| 353 | return index;
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| 354 | }
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| 355 |
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| 356 | class QwtAlphaColorMap::PrivateData
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| 357 | {
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| 358 | public:
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| 359 | QColor color;
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| 360 | QRgb rgb;
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| 361 | };
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| 362 |
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| 363 |
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| 364 | /*!
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| 365 | Constructor
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| 366 | \param color Color of the map
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| 367 | */
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| 368 | QwtAlphaColorMap::QwtAlphaColorMap( const QColor &color ):
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| 369 | QwtColorMap( QwtColorMap::RGB )
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| 370 | {
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| 371 | d_data = new PrivateData;
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| 372 | d_data->color = color;
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| 373 | d_data->rgb = color.rgb() & qRgba( 255, 255, 255, 0 );
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| 374 | }
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| 375 |
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| 376 | //! Destructor
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| 377 | QwtAlphaColorMap::~QwtAlphaColorMap()
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| 378 | {
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| 379 | delete d_data;
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| 380 | }
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| 381 |
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| 382 | /*!
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| 383 | Set the color
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| 384 |
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| 385 | \param color Color
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| 386 | \sa color()
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| 387 | */
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| 388 | void QwtAlphaColorMap::setColor( const QColor &color )
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| 389 | {
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| 390 | d_data->color = color;
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| 391 | d_data->rgb = color.rgb();
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| 392 | }
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| 393 |
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| 394 | /*!
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| 395 | \return the color
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| 396 | \sa setColor()
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| 397 | */
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| 398 | QColor QwtAlphaColorMap::color() const
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| 399 | {
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| 400 | return d_data->color;
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| 401 | }
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| 402 |
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| 403 | /*!
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| 404 | \brief Map a value of a given interval into a alpha value
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| 405 |
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| 406 | alpha := (value - interval.minValue()) / interval.width();
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| 407 |
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| 408 | \param interval Range for all values
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| 409 | \param value Value to map into a rgb value
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| 410 | \return rgb value, with an alpha value
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| 411 | */
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| 412 | QRgb QwtAlphaColorMap::rgb( const QwtInterval &interval, double value ) const
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| 413 | {
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| 414 | const double width = interval.width();
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| 415 | if ( !qIsNaN(value) && width >= 0.0 )
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| 416 | {
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| 417 | const double ratio = ( value - interval.minValue() ) / width;
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| 418 | int alpha = qRound( 255 * ratio );
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| 419 | if ( alpha < 0 )
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| 420 | alpha = 0;
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| 421 | if ( alpha > 255 )
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| 422 | alpha = 255;
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| 423 |
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| 424 | return d_data->rgb | ( alpha << 24 );
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| 425 | }
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| 426 | return d_data->rgb;
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| 427 | }
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| 428 |
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| 429 | /*!
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| 430 | Dummy function, needed to be implemented as it is pure virtual
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| 431 | in QwtColorMap. Color indices make no sense in combination with
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| 432 | an alpha channel.
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| 433 |
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| 434 | \return Always 0
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| 435 | */
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| 436 | unsigned char QwtAlphaColorMap::colorIndex(
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| 437 | const QwtInterval &, double ) const
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| 438 | {
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| 439 | return 0;
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| 440 | }
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