Chris@196: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@196: 
Chris@196: /*
Chris@196:     Sonic Visualiser
Chris@196:     An audio file viewer and annotation editor.
Chris@196:     Centre for Digital Music, Queen Mary, University of London.
Chris@196:     This file copyright 2006-2007 Chris Cannam and QMUL.
Chris@196:     
Chris@196:     This program is free software; you can redistribute it and/or
Chris@196:     modify it under the terms of the GNU General Public License as
Chris@196:     published by the Free Software Foundation; either version 2 of the
Chris@196:     License, or (at your option) any later version.  See the file
Chris@196:     COPYING included with this distribution for more information.
Chris@196: */
Chris@196: 
Chris@196: #include "ColourMapper.h"
Chris@196: 
Chris@197: #include <iostream>
Chris@197: 
Chris@201: #include <cmath>
Chris@201: 
Chris@196: ColourMapper::ColourMapper(int map, float min, float max) :
Chris@196:     QObject(),
Chris@196:     m_map(map),
Chris@196:     m_min(min),
Chris@196:     m_max(max)
Chris@196: {
Chris@197:     if (m_min == m_max) {
Chris@197:         std::cerr << "WARNING: ColourMapper: min == max (== " << m_min
Chris@197:                   << "), adjusting" << std::endl;
Chris@197:         m_max = m_min + 1;
Chris@197:     }
Chris@196: }
Chris@196: 
Chris@196: ColourMapper::~ColourMapper()
Chris@196: {
Chris@196: }
Chris@196: 
Chris@196: int
Chris@196: ColourMapper::getColourMapCount()
Chris@196: {
Chris@197:     return 10;
Chris@196: }
Chris@196: 
Chris@196: QString
Chris@196: ColourMapper::getColourMapName(int n)
Chris@196: {
Chris@197:     if (n >= getColourMapCount()) return tr("<unknown>");
Chris@196:     StandardMap map = (StandardMap)n;
Chris@196: 
Chris@196:     switch (map) {
Chris@196:     case DefaultColours:   return tr("Default");
Chris@196:     case WhiteOnBlack:     return tr("White on Black");
Chris@196:     case BlackOnWhite:     return tr("Black on White");
Chris@196:     case RedOnBlue:        return tr("Red on Blue");
Chris@196:     case YellowOnBlack:    return tr("Yellow on Black");
Chris@196:     case BlueOnBlack:      return tr("Blue on Black");
Chris@196:     case Sunset:           return tr("Sunset");
Chris@196:     case FruitSalad:       return tr("Fruit Salad");
Chris@197:     case Banded:           return tr("Banded");
Chris@197:     case Highlight:        return tr("Highlight");
Chris@196:     }
Chris@196: 
Chris@196:     return tr("<unknown>");
Chris@196: }
Chris@196: 
Chris@196: QColor
Chris@196: ColourMapper::map(float value) const
Chris@196: {
Chris@196:     float norm = (value - m_min) / (m_max - m_min);
Chris@196:     if (norm < 0.f) norm = 0.f;
Chris@196:     if (norm > 1.f) norm = 1.f;
Chris@196:     
Chris@196:     float h = 0.f, s = 0.f, v = 0.f, r = 0.f, g = 0.f, b = 0.f;
Chris@196:     bool hsv = true;
Chris@196: 
Chris@196:     float red = 0.f, green = 0.3333f, blue = 0.6666f, pieslice = 0.3333f;
Chris@196: 
Chris@197:     if (m_map >= getColourMapCount()) return Qt::black;
Chris@196:     StandardMap map = (StandardMap)m_map;
Chris@196: 
Chris@196:     switch (map) {
Chris@196: 
Chris@196:     case DefaultColours:
Chris@196:         h = blue - norm * 2.f * pieslice;
Chris@196:         s = 0.5f + norm/2.f;
Chris@196:         v = norm;
Chris@196:         break;
Chris@196: 
Chris@196:     case WhiteOnBlack:
Chris@196:         r = g = b = norm;
Chris@196:         hsv = false;
Chris@196:         break;
Chris@196: 
Chris@196:     case BlackOnWhite:
Chris@196:         r = g = b = 1.f - norm;
Chris@196:         hsv = false;
Chris@196:         break;
Chris@196: 
Chris@196:     case RedOnBlue:
Chris@196:         h = blue - pieslice/4.f + norm * (pieslice + pieslice/4.f);
Chris@196:         s = 1.f;
Chris@196:         v = norm;
Chris@196:         break;
Chris@196: 
Chris@196:     case YellowOnBlack:
Chris@196:         h = 0.15f;
Chris@196:         s = 1.f;
Chris@196:         v = norm;
Chris@196:         break;
Chris@196: 
Chris@196:     case BlueOnBlack:
Chris@197:         h = blue;
Chris@196:         s = 1.f;
Chris@196:         v = norm * 2.f;
Chris@197:         if (v > 1.f) {
Chris@196:             v = 1.f;
Chris@197:             s = 1.f - (sqrtf(norm) - 0.707f) * 3.413f;
Chris@197:             if (s < 0.f) s = 0.f;
Chris@197:             if (s > 1.f) s = 1.f;
Chris@196:         }
Chris@196:         break;
Chris@196: 
Chris@196:     case Sunset:
Chris@196:         r = (norm - 0.24f) * 2.38f;
Chris@196:         if (r > 1.f) r = 1.f;
Chris@196:         if (r < 0.f) r = 0.f;
Chris@196:         g = (norm - 0.64f) * 2.777f;
Chris@196:         if (g > 1.f) g = 1.f;
Chris@196:         if (g < 0.f) g = 0.f;
Chris@196:         b = (3.6f * norm);
Chris@196:         if (norm > 0.277f) b = 2.f - b;
Chris@196:         if (b > 1.f) b = 1.f;
Chris@196:         if (b < 0.f) b = 0.f;
Chris@196:         hsv = false;
Chris@196:         break;
Chris@196: 
Chris@196:     case FruitSalad:
Chris@197:         h = blue + (pieslice/6.f) - norm;
Chris@196:         if (h < 0.f) h += 1.f;
Chris@196:         s = 1.f;
Chris@196:         v = 1.f;
Chris@196:         break;
Chris@197: 
Chris@197:     case Banded:
Chris@197:         if      (norm < 0.125) return Qt::darkGreen;
Chris@197:         else if (norm < 0.25)  return Qt::green;
Chris@197:         else if (norm < 0.375) return Qt::darkBlue;
Chris@197:         else if (norm < 0.5)   return Qt::blue;
Chris@197:         else if (norm < 0.625) return Qt::darkYellow;
Chris@197:         else if (norm < 0.75)  return Qt::yellow;
Chris@197:         else if (norm < 0.875) return Qt::darkRed;
Chris@197:         else                   return Qt::red;
Chris@197:         break;
Chris@197: 
Chris@197:     case Highlight:
Chris@197:         if (norm > 0.99) return Qt::white;
Chris@197:         else return Qt::darkBlue;
Chris@196:     }
Chris@196: 
Chris@196:     if (hsv) {
Chris@196:         return QColor::fromHsvF(h, s, v);
Chris@196:     } else {
Chris@196:         return QColor::fromRgbF(r, g, b);
Chris@196:     }
Chris@196: }
Chris@196: 
Chris@196: QColor
Chris@196: ColourMapper::getContrastingColour() const
Chris@196: {
Chris@197:     if (m_map >= getColourMapCount()) return Qt::white;
Chris@196:     StandardMap map = (StandardMap)m_map;
Chris@196: 
Chris@196:     switch (map) {
Chris@196: 
Chris@196:     case DefaultColours:
Chris@196:         return QColor(255, 150, 50);
Chris@196: 
Chris@196:     case WhiteOnBlack:
Chris@196:         return Qt::red;
Chris@196: 
Chris@196:     case BlackOnWhite:
Chris@196:         return Qt::darkGreen;
Chris@196: 
Chris@196:     case RedOnBlue:
Chris@196:         return Qt::green;
Chris@196: 
Chris@196:     case YellowOnBlack:
Chris@196:         return QColor::fromHsv(240, 255, 255);
Chris@196: 
Chris@196:     case BlueOnBlack:
Chris@196:         return Qt::red;
Chris@196: 
Chris@196:     case Sunset:
Chris@196:         return Qt::white;
Chris@196: 
Chris@196:     case FruitSalad:
Chris@196:         return Qt::white;
Chris@197: 
Chris@197:     case Banded:
Chris@197:         return Qt::cyan;
Chris@197: 
Chris@197:     case Highlight:
Chris@197:         return Qt::red;
Chris@196:     }
Chris@196: 
Chris@196:     return Qt::white;
Chris@196: }
Chris@196: 
Chris@196: