Chris@376: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@376: 
Chris@376: /*
Chris@376:     Sonic Visualiser
Chris@376:     An audio file viewer and annotation editor.
Chris@376:     Centre for Digital Music, Queen Mary, University of London.
Chris@1199:     This file copyright 2006-2016 Chris Cannam and QMUL.
Chris@376:     
Chris@376:     This program is free software; you can redistribute it and/or
Chris@376:     modify it under the terms of the GNU General Public License as
Chris@376:     published by the Free Software Foundation; either version 2 of the
Chris@376:     License, or (at your option) any later version.  See the file
Chris@376:     COPYING included with this distribution for more information.
Chris@376: */
Chris@376: 
Chris@376: #include "ColourMapper.h"
Chris@376: 
Chris@376: #include <iostream>
Chris@376: 
Chris@376: #include <cmath>
Chris@376: 
Chris@682: #include "base/Debug.h"
Chris@682: 
Chris@1012: #include <vector>
Chris@1012: 
Chris@1199: #include <QPainter>
Chris@1199: 
Chris@1012: using namespace std;
Chris@1012: 
Chris@1362: static vector<QColor> convertStrings(const vector<QString> &strs,
Chris@1362:                                      bool reversed)
Chris@1012: {
Chris@1012:     vector<QColor> converted;
Chris@1012:     for (const auto &s: strs) converted.push_back(QColor(s));
Chris@1362:     if (reversed) {
Chris@1362:         reverse(converted.begin(), converted.end());
Chris@1362:     }
Chris@1012:     return converted;
Chris@1012: }
Chris@1012: 
Chris@1017: static vector<QColor> ice = convertStrings({
Chris@1015:         // Based on ColorBrewer ylGnBu
Chris@1015:         "#ffffff", "#ffff00", "#f7fcf0", "#e0f3db", "#ccebc5", "#a8ddb5",
Chris@1015:         "#7bccc4", "#4eb3d3", "#2b8cbe", "#0868ac", "#084081", "#042040"
Chris@1362:     },
Chris@1362:     true);
Chris@1012: 
Chris@1017: static vector<QColor> cherry = convertStrings({
Chris@1016:         "#f7f7f7", "#fddbc7", "#f4a582", "#d6604d", "#b2182b", "#dd3497",
Chris@1016:         "#ae017e", "#7a0177", "#49006a"
Chris@1362:     },
Chris@1362:     true);
Chris@1362: 
Chris@1362: static vector<QColor> magma = convertStrings({
Chris@1362:         "#FCFFB2", "#FCDF96", "#FBC17D", "#FBA368", "#FA8657", "#F66B4D",
Chris@1362:         "#ED504A", "#E03B50", "#C92D59", "#B02363", "#981D69", "#81176D",
Chris@1362:         "#6B116F", "#57096E", "#43006A", "#300060", "#1E0848", "#110B2D",
Chris@1362:         "#080616", "#000005"
Chris@1362:     },
Chris@1362:     true);
Chris@1362: 
Chris@1362: static vector<QColor> cividis = convertStrings({
Chris@1362:         "#00204c", "#00204e", "#002150", "#002251", "#002353", "#002355",
Chris@1362:         "#002456", "#002558", "#00265a", "#00265b", "#00275d", "#00285f",
Chris@1362:         "#002861", "#002963", "#002a64", "#002a66", "#002b68", "#002c6a",
Chris@1362:         "#002d6c", "#002d6d", "#002e6e", "#002e6f", "#002f6f", "#002f6f",
Chris@1362:         "#00306f", "#00316f", "#00316f", "#00326e", "#00336e", "#00346e",
Chris@1362:         "#00346e", "#01356e", "#06366e", "#0a376d", "#0e376d", "#12386d",
Chris@1362:         "#15396d", "#17396d", "#1a3a6c", "#1c3b6c", "#1e3c6c", "#203c6c",
Chris@1362:         "#223d6c", "#243e6c", "#263e6c", "#273f6c", "#29406b", "#2b416b",
Chris@1362:         "#2c416b", "#2e426b", "#2f436b", "#31446b", "#32446b", "#33456b",
Chris@1362:         "#35466b", "#36466b", "#37476b", "#38486b", "#3a496b", "#3b496b",
Chris@1362:         "#3c4a6b", "#3d4b6b", "#3e4b6b", "#404c6b", "#414d6b", "#424e6b",
Chris@1362:         "#434e6b", "#444f6b", "#45506b", "#46506b", "#47516b", "#48526b",
Chris@1362:         "#49536b", "#4a536b", "#4b546b", "#4c556b", "#4d556b", "#4e566b",
Chris@1362:         "#4f576c", "#50586c", "#51586c", "#52596c", "#535a6c", "#545a6c",
Chris@1362:         "#555b6c", "#565c6c", "#575d6d", "#585d6d", "#595e6d", "#5a5f6d",
Chris@1362:         "#5b5f6d", "#5c606d", "#5d616e", "#5e626e", "#5f626e", "#5f636e",
Chris@1362:         "#60646e", "#61656f", "#62656f", "#63666f", "#64676f", "#65676f",
Chris@1362:         "#666870", "#676970", "#686a70", "#686a70", "#696b71", "#6a6c71",
Chris@1362:         "#6b6d71", "#6c6d72", "#6d6e72", "#6e6f72", "#6f6f72", "#6f7073",
Chris@1362:         "#707173", "#717273", "#727274", "#737374", "#747475", "#757575",
Chris@1362:         "#757575", "#767676", "#777776", "#787876", "#797877", "#7a7977",
Chris@1362:         "#7b7a77", "#7b7b78", "#7c7b78", "#7d7c78", "#7e7d78", "#7f7e78",
Chris@1362:         "#807e78", "#817f78", "#828078", "#838178", "#848178", "#858278",
Chris@1362:         "#868378", "#878478", "#888578", "#898578", "#8a8678", "#8b8778",
Chris@1362:         "#8c8878", "#8d8878", "#8e8978", "#8f8a78", "#908b78", "#918c78",
Chris@1362:         "#928c78", "#938d78", "#948e78", "#958f78", "#968f77", "#979077",
Chris@1362:         "#989177", "#999277", "#9a9377", "#9b9377", "#9c9477", "#9d9577",
Chris@1362:         "#9e9676", "#9f9776", "#a09876", "#a19876", "#a29976", "#a39a75",
Chris@1362:         "#a49b75", "#a59c75", "#a69c75", "#a79d75", "#a89e74", "#a99f74",
Chris@1362:         "#aaa074", "#aba174", "#aca173", "#ada273", "#aea373", "#afa473",
Chris@1362:         "#b0a572", "#b1a672", "#b2a672", "#b4a771", "#b5a871", "#b6a971",
Chris@1362:         "#b7aa70", "#b8ab70", "#b9ab70", "#baac6f", "#bbad6f", "#bcae6e",
Chris@1362:         "#bdaf6e", "#beb06e", "#bfb16d", "#c0b16d", "#c1b26c", "#c2b36c",
Chris@1362:         "#c3b46c", "#c5b56b", "#c6b66b", "#c7b76a", "#c8b86a", "#c9b869",
Chris@1362:         "#cab969", "#cbba68", "#ccbb68", "#cdbc67", "#cebd67", "#d0be66",
Chris@1362:         "#d1bf66", "#d2c065", "#d3c065", "#d4c164", "#d5c263", "#d6c363",
Chris@1362:         "#d7c462", "#d8c561", "#d9c661", "#dbc760", "#dcc860", "#ddc95f",
Chris@1362:         "#deca5e", "#dfcb5d", "#e0cb5d", "#e1cc5c", "#e3cd5b", "#e4ce5b",
Chris@1362:         "#e5cf5a", "#e6d059", "#e7d158", "#e8d257", "#e9d356", "#ebd456",
Chris@1362:         "#ecd555", "#edd654", "#eed753", "#efd852", "#f0d951", "#f1da50",
Chris@1362:         "#f3db4f", "#f4dc4e", "#f5dd4d", "#f6de4c", "#f7df4b", "#f9e049",
Chris@1362:         "#fae048", "#fbe147", "#fce246", "#fde345", "#ffe443", "#ffe542",
Chris@1362:         "#ffe642", "#ffe743", "#ffe844", "#ffe945"
Chris@1362:     },
Chris@1362:     false);
Chris@1362: 
Chris@1012: static void
Chris@1012: mapDiscrete(double norm, vector<QColor> &colours, double &r, double &g, double &b)
Chris@1012: {
Chris@1015:     int n = int(colours.size());
Chris@1012:     double m = norm * (n-1);
Chris@1408:     if (m >= n-1) { colours[n-1].getRgbF(&r, &g, &b, nullptr); return; }
Chris@1408:     if (m <= 0) { colours[0].getRgbF(&r, &g, &b, nullptr); return; }
Chris@1012:     int base(int(floor(m)));
Chris@1012:     double prop0 = (base + 1.0) - m, prop1 = m - base;
Chris@1012:     QColor c0(colours[base]), c1(colours[base+1]);
Chris@1012:     r = c0.redF() * prop0 + c1.redF() * prop1;
Chris@1012:     g = c0.greenF() * prop0 + c1.greenF() * prop1;
Chris@1012:     b = c0.blueF() * prop0 + c1.blueF() * prop1;
Chris@1012: }
Chris@1012: 
Chris@1362: ColourMapper::ColourMapper(int map, bool inverted, double min, double max) :
Chris@376:     m_map(map),
Chris@1362:     m_inverted(inverted),
Chris@376:     m_min(min),
Chris@376:     m_max(max)
Chris@376: {
Chris@376:     if (m_min == m_max) {
Chris@1265:         SVCERR << "WARNING: ColourMapper: min == max (== " << m_min
Chris@682:                   << "), adjusting" << endl;
Chris@376:         m_max = m_min + 1;
Chris@376:     }
Chris@376: }
Chris@376: 
Chris@376: ColourMapper::~ColourMapper()
Chris@376: {
Chris@376: }
Chris@376: 
Chris@376: int
Chris@376: ColourMapper::getColourMapCount()
Chris@376: {
Chris@1362:     return 15;
Chris@376: }
Chris@376: 
Chris@376: QString
Chris@1362: ColourMapper::getColourMapLabel(int n)
Chris@376: {
Chris@1362:     // When adding a map, be sure to also update getColourMapCount()
Chris@1362:     
Chris@1071:     if (n >= getColourMapCount()) return QObject::tr("<unknown>");
Chris@1362:     ColourMap map = (ColourMap)n;
Chris@376: 
Chris@376:     switch (map) {
Chris@1071:     case Green:            return QObject::tr("Green");
Chris@1071:     case WhiteOnBlack:     return QObject::tr("White on Black");
Chris@1071:     case BlackOnWhite:     return QObject::tr("Black on White");
Chris@1071:     case Cherry:           return QObject::tr("Cherry");
Chris@1071:     case Wasp:             return QObject::tr("Wasp");
Chris@1071:     case Ice:              return QObject::tr("Ice");
Chris@1071:     case Sunset:           return QObject::tr("Sunset");
Chris@1071:     case FruitSalad:       return QObject::tr("Fruit Salad");
Chris@1071:     case Banded:           return QObject::tr("Banded");
Chris@1071:     case Highlight:        return QObject::tr("Highlight");
Chris@1071:     case Printer:          return QObject::tr("Printer");
Chris@1071:     case HighGain:         return QObject::tr("High Gain");
Chris@1362:     case BlueOnBlack:      return QObject::tr("Blue on Black");
Chris@1362:     case Cividis:          return QObject::tr("Cividis");
Chris@1362:     case Magma:            return QObject::tr("Magma");
Chris@376:     }
Chris@376: 
Chris@1071:     return QObject::tr("<unknown>");
Chris@376: }
Chris@376: 
Chris@1362: QString
Chris@1362: ColourMapper::getColourMapId(int n)
Chris@1362: {
Chris@1362:     if (n >= getColourMapCount()) return "<unknown>";
Chris@1362:     ColourMap map = (ColourMap)n;
Chris@1362: 
Chris@1362:     switch (map) {
Chris@1362:     case Green:            return "Green";
Chris@1362:     case WhiteOnBlack:     return "White on Black";
Chris@1362:     case BlackOnWhite:     return "Black on White";
Chris@1362:     case Cherry:           return "Cherry";
Chris@1362:     case Wasp:             return "Wasp";
Chris@1362:     case Ice:              return "Ice";
Chris@1362:     case Sunset:           return "Sunset";
Chris@1362:     case FruitSalad:       return "Fruit Salad";
Chris@1362:     case Banded:           return "Banded";
Chris@1362:     case Highlight:        return "Highlight";
Chris@1362:     case Printer:          return "Printer";
Chris@1362:     case HighGain:         return "High Gain";
Chris@1362:     case BlueOnBlack:      return "Blue on Black";
Chris@1362:     case Cividis:          return "Cividis";
Chris@1362:     case Magma:            return "Magma";
Chris@1362:     }
Chris@1362: 
Chris@1362:     return "<unknown>";
Chris@1362: }
Chris@1362: 
Chris@1362: int
Chris@1362: ColourMapper::getColourMapById(QString id)
Chris@1362: {
Chris@1362:     ColourMap map = (ColourMap)getColourMapCount();
Chris@1362: 
Chris@1362:     if      (id == "Green")            { map = Green; }
Chris@1362:     else if (id == "White on Black")   { map = WhiteOnBlack; }
Chris@1362:     else if (id == "Black on White")   { map = BlackOnWhite; }
Chris@1362:     else if (id == "Cherry")           { map = Cherry; }
Chris@1362:     else if (id == "Wasp")             { map = Wasp; }
Chris@1362:     else if (id == "Ice")              { map = Ice; }
Chris@1362:     else if (id == "Sunset")           { map = Sunset; }
Chris@1362:     else if (id == "Fruit Salad")      { map = FruitSalad; }
Chris@1362:     else if (id == "Banded")           { map = Banded; }
Chris@1362:     else if (id == "Highlight")        { map = Highlight; }
Chris@1362:     else if (id == "Printer")          { map = Printer; }
Chris@1362:     else if (id == "High Gain")        { map = HighGain; }
Chris@1362:     else if (id == "Blue on Black")    { map = BlueOnBlack; }
Chris@1362:     else if (id == "Cividis")          { map = Cividis; }
Chris@1362:     else if (id == "Magma")            { map = Magma; }
Chris@1362: 
Chris@1362:     if (map == (ColourMap)getColourMapCount()) {
Chris@1362:         return -1;
Chris@1362:     } else {
Chris@1362:         return int(map);
Chris@1362:     }
Chris@1362: }
Chris@1362: 
Chris@1362: int
Chris@1362: ColourMapper::getBackwardCompatibilityColourMap(int n)
Chris@1362: {
Chris@1362:     /* Returned value should be an index into the series
Chris@1362:      * (Default/Green, Sunset, WhiteOnBlack, BlackOnWhite, RedOnBlue,
Chris@1362:      * YellowOnBlack, BlueOnBlack, FruitSalad, Banded, Highlight,
Chris@1362:      * Printer, HighGain). Minimum 0, maximum 11.
Chris@1362:      */
Chris@1362:         
Chris@1362:     if (n >= getColourMapCount()) return 0;
Chris@1362:     ColourMap map = (ColourMap)n;
Chris@1362: 
Chris@1362:     switch (map) {
Chris@1362:     case Green:            return 0;
Chris@1362:     case WhiteOnBlack:     return 2;
Chris@1362:     case BlackOnWhite:     return 3;
Chris@1362:     case Cherry:           return 4;
Chris@1362:     case Wasp:             return 5;
Chris@1362:     case Ice:              return 6;
Chris@1362:     case Sunset:           return 1;
Chris@1362:     case FruitSalad:       return 7;
Chris@1362:     case Banded:           return 8;
Chris@1362:     case Highlight:        return 9;
Chris@1362:     case Printer:          return 10;
Chris@1362:     case HighGain:         return 11;
Chris@1362:     case BlueOnBlack:      return 6;
Chris@1362:     case Cividis:          return 6;
Chris@1362:     case Magma:            return 1;
Chris@1362:     }
Chris@1362: 
Chris@1362:     return 0;
Chris@1362: }
Chris@1362: 
Chris@376: QColor
Chris@902: ColourMapper::map(double value) const
Chris@376: {
Chris@902:     double norm = (value - m_min) / (m_max - m_min);
Chris@902:     if (norm < 0.0) norm = 0.0;
Chris@902:     if (norm > 1.0) norm = 1.0;
Chris@1362: 
Chris@1362:     if (m_inverted) {
Chris@1362:         norm = 1.0 - norm;
Chris@1362:     }
Chris@376:     
Chris@902:     double h = 0.0, s = 0.0, v = 0.0, r = 0.0, g = 0.0, b = 0.0;
Chris@376:     bool hsv = true;
Chris@376: 
Chris@911:     double blue = 0.6666, pieslice = 0.3333;
Chris@376: 
Chris@376:     if (m_map >= getColourMapCount()) return Qt::black;
Chris@1362:     ColourMap map = (ColourMap)m_map;
Chris@376: 
Chris@376:     switch (map) {
Chris@376: 
Chris@1017:     case Green:
Chris@902:         h = blue - norm * 2.0 * pieslice;
Chris@902:         s = 0.5f + norm/2.0;
Chris@376:         v = norm;
Chris@376:         break;
Chris@376: 
Chris@376:     case WhiteOnBlack:
Chris@376:         r = g = b = norm;
Chris@376:         hsv = false;
Chris@376:         break;
Chris@376: 
Chris@376:     case BlackOnWhite:
Chris@902:         r = g = b = 1.0 - norm;
Chris@376:         hsv = false;
Chris@376:         break;
Chris@376: 
Chris@1017:     case Cherry:
Chris@1015:         hsv = false;
Chris@1017:         mapDiscrete(norm, cherry, r, g, b);
Chris@376:         break;
Chris@376: 
Chris@1017:     case Wasp:
Chris@902:         h = 0.15;
Chris@902:         s = 1.0;
Chris@376:         v = norm;
Chris@376:         break;
Chris@1362:         
Chris@1362:     case BlueOnBlack:
Chris@1362:         h = blue;
Chris@1362:         s = 1.0;
Chris@1362:         v = norm * 2.0;
Chris@1362:         if (v > 1.0) {
Chris@1362:             v = 1.0;
Chris@1362:             s = 1.0 - (sqrt(norm) - 0.707) * 3.413;
Chris@1362:             if (s < 0.0) s = 0.0;
Chris@1362:             if (s > 1.0) s = 1.0;
Chris@1362:         }
Chris@1362:         break;
Chris@376: 
Chris@376:     case Sunset:
Chris@902:         r = (norm - 0.24) * 2.38;
Chris@902:         if (r > 1.0) r = 1.0;
Chris@902:         if (r < 0.0) r = 0.0;
Chris@902:         g = (norm - 0.64) * 2.777;
Chris@902:         if (g > 1.0) g = 1.0;
Chris@902:         if (g < 0.0) g = 0.0;
Chris@376:         b = (3.6f * norm);
Chris@902:         if (norm > 0.277) b = 2.0 - b;
Chris@902:         if (b > 1.0) b = 1.0;
Chris@902:         if (b < 0.0) b = 0.0;
Chris@376:         hsv = false;
Chris@376:         break;
Chris@376: 
Chris@376:     case FruitSalad:
Chris@902:         h = blue + (pieslice/6.0) - norm;
Chris@902:         if (h < 0.0) h += 1.0;
Chris@902:         s = 1.0;
Chris@902:         v = 1.0;
Chris@376:         break;
Chris@376: 
Chris@376:     case Banded:
Chris@376:         if      (norm < 0.125) return Qt::darkGreen;
Chris@376:         else if (norm < 0.25)  return Qt::green;
Chris@376:         else if (norm < 0.375) return Qt::darkBlue;
Chris@376:         else if (norm < 0.5)   return Qt::blue;
Chris@376:         else if (norm < 0.625) return Qt::darkYellow;
Chris@376:         else if (norm < 0.75)  return Qt::yellow;
Chris@376:         else if (norm < 0.875) return Qt::darkRed;
Chris@376:         else                   return Qt::red;
Chris@376:         break;
Chris@376: 
Chris@376:     case Highlight:
Chris@376:         if (norm > 0.99) return Qt::white;
Chris@376:         else return Qt::darkBlue;
Chris@376: 
Chris@376:     case Printer:
Chris@376:         if (norm > 0.8) {
Chris@902:             r = 1.0;
Chris@376:         } else if (norm > 0.7) {
Chris@902:             r = 0.9;
Chris@376:         } else if (norm > 0.6) {
Chris@902:             r = 0.8;
Chris@376:         } else if (norm > 0.5) {
Chris@902:             r = 0.7;
Chris@376:         } else if (norm > 0.4) {
Chris@902:             r = 0.6;
Chris@376:         } else if (norm > 0.3) {
Chris@902:             r = 0.5;
Chris@376:         } else if (norm > 0.2) {
Chris@902:             r = 0.4;
Chris@376:         } else {
Chris@902:             r = 0.0;
Chris@376:         }
Chris@902:         r = g = b = 1.0 - r;
Chris@376:         hsv = false;
Chris@376:         break;
Chris@536: 
Chris@536:     case HighGain:
Chris@902:         if (norm <= 1.0 / 256.0) {
Chris@902:             norm = 0.0;
Chris@536:         } else {
Chris@904:             norm = 0.1f + (pow(((norm - 0.5) * 2.0), 3.0) + 1.0) / 2.081;
Chris@536:         }
Chris@536:         // now as for Sunset
Chris@902:         r = (norm - 0.24) * 2.38;
Chris@902:         if (r > 1.0) r = 1.0;
Chris@902:         if (r < 0.0) r = 0.0;
Chris@902:         g = (norm - 0.64) * 2.777;
Chris@902:         if (g > 1.0) g = 1.0;
Chris@902:         if (g < 0.0) g = 0.0;
Chris@536:         b = (3.6f * norm);
Chris@902:         if (norm > 0.277) b = 2.0 - b;
Chris@902:         if (b > 1.0) b = 1.0;
Chris@902:         if (b < 0.0) b = 0.0;
Chris@536:         hsv = false;
Chris@536: /*
Chris@902:         if (r > 1.0) r = 1.0;
Chris@902:         r = g = b = 1.0 - r;
Chris@536:         hsv = false;
Chris@536: */
Chris@536:         break;
Chris@1012: 
Chris@1017:     case Ice:
Chris@1012:         hsv = false;
Chris@1017:         mapDiscrete(norm, ice, r, g, b);
Chris@1362:         break;
Chris@1362: 
Chris@1362:     case Cividis:
Chris@1362:         hsv = false;
Chris@1362:         mapDiscrete(norm, cividis, r, g, b);
Chris@1362:         break;
Chris@1362: 
Chris@1362:     case Magma:
Chris@1362:         hsv = false;
Chris@1362:         mapDiscrete(norm, magma, r, g, b);
Chris@1362:         break;
Chris@376:     }
Chris@376: 
Chris@376:     if (hsv) {
Chris@376:         return QColor::fromHsvF(h, s, v);
Chris@376:     } else {
Chris@376:         return QColor::fromRgbF(r, g, b);
Chris@376:     }
Chris@376: }
Chris@376: 
Chris@376: QColor
Chris@376: ColourMapper::getContrastingColour() const
Chris@376: {
Chris@376:     if (m_map >= getColourMapCount()) return Qt::white;
Chris@1362:     ColourMap map = (ColourMap)m_map;
Chris@376: 
Chris@376:     switch (map) {
Chris@376: 
Chris@1017:     case Green:
Chris@376:         return QColor(255, 150, 50);
Chris@376: 
Chris@376:     case WhiteOnBlack:
Chris@376:         return Qt::red;
Chris@376: 
Chris@376:     case BlackOnWhite:
Chris@376:         return Qt::darkGreen;
Chris@376: 
Chris@1017:     case Cherry:
Chris@376:         return Qt::green;
Chris@376: 
Chris@1017:     case Wasp:
Chris@376:         return QColor::fromHsv(240, 255, 255);
Chris@376: 
Chris@1017:     case Ice:
Chris@376:         return Qt::red;
Chris@376: 
Chris@376:     case Sunset:
Chris@376:         return Qt::white;
Chris@376: 
Chris@376:     case FruitSalad:
Chris@376:         return Qt::white;
Chris@376: 
Chris@376:     case Banded:
Chris@376:         return Qt::cyan;
Chris@376: 
Chris@376:     case Highlight:
Chris@376:         return Qt::red;
Chris@376: 
Chris@376:     case Printer:
Chris@376:         return Qt::red;
Chris@536: 
Chris@536:     case HighGain:
Chris@536:         return Qt::red;
Chris@1362: 
Chris@1362:     case BlueOnBlack:
Chris@1362:         return Qt::red;
Chris@1362: 
Chris@1362:     case Cividis:
Chris@1362:         return Qt::white;
Chris@1362: 
Chris@1362:     case Magma:
Chris@1362:         return Qt::white;
Chris@376:     }
Chris@376: 
Chris@376:     return Qt::white;
Chris@376: }
Chris@376: 
Chris@376: bool
Chris@376: ColourMapper::hasLightBackground() const
Chris@376: {
Chris@376:     if (m_map >= getColourMapCount()) return false;
Chris@1362:     ColourMap map = (ColourMap)m_map;
Chris@376: 
Chris@376:     switch (map) {
Chris@376: 
Chris@376:     case BlackOnWhite:
Chris@376:     case Printer:
Chris@536:     case HighGain:
Chris@376:         return true;
Chris@376: 
Chris@1017:     case Green:
Chris@805:     case Sunset:
Chris@805:     case WhiteOnBlack:
Chris@1017:     case Cherry:
Chris@1017:     case Wasp:
Chris@1017:     case Ice:
Chris@805:     case FruitSalad:
Chris@805:     case Banded:
Chris@805:     case Highlight:
Chris@1362:     case BlueOnBlack:
Chris@1362:     case Cividis:
Chris@1362:     case Magma:
Chris@805:         
Chris@376:     default:
Chris@376:         return false;
Chris@376:     }
Chris@376: }
Chris@376: 
Chris@1199: QPixmap
Chris@1199: ColourMapper::getExamplePixmap(QSize size) const
Chris@1199: {
Chris@1199:     QPixmap pmap(size);
Chris@1199:     pmap.fill(Qt::white);
Chris@1199:     QPainter paint(&pmap);
Chris@376: 
Chris@1199:     int w = size.width(), h = size.height();
Chris@1199:     
Chris@1199:     int margin = 2;
Chris@1199:     if (w < 4 || h < 4) margin = 0;
Chris@1199:     else if (w < 8 || h < 8) margin = 1;
Chris@1199: 
Chris@1199:     int n = w - margin*2;
Chris@1199:     
Chris@1199:     for (int x = 0; x < n; ++x) {
Chris@1199:         double value = m_min + ((m_max - m_min) * x) / (n-1);
Chris@1199:         QColor colour(map(value));
Chris@1199:         paint.setPen(colour);
Chris@1199:         paint.drawLine(x + margin, margin, x + margin, h - margin);
Chris@1199:     }
Chris@1199:     
Chris@1199:     return pmap;
Chris@1199: }
Chris@1199: 
Chris@1199: