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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006-2016 Chris Cannam and QMUL.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "ColourScale.h"
#include "base/AudioLevel.h"
#include "base/LogRange.h"
#include <cmath>
#include <iostream>
using namespace std;
namespace sv {
int ColourScale::m_maxPixel = 255;
ColourScale::ColourScale(Parameters parameters) :
m_params(parameters),
m_mapper(m_params.colourMap, m_params.inverted, 1.f, double(m_maxPixel))
{
if (m_params.minValue >= m_params.maxValue) {
SVCERR << "ERROR: ColourScale::ColourScale: minValue = "
<< m_params.minValue << ", maxValue = " << m_params.maxValue << endl;
throw std::logic_error("maxValue must be greater than minValue");
}
m_mappedMin = m_params.minValue;
m_mappedMax = m_params.maxValue;
if (m_mappedMin < m_params.threshold) {
m_mappedMin = m_params.threshold;
}
if (m_params.scaleType == ColourScaleType::Log) {
// When used in e.g. spectrogram, we have a range with a min
// value of zero. The LogRange converts that to a threshold
// value of -10, so for a range of e.g. (0,1) we end up with
// (-10,0) as the mapped range.
//
// But in other contexts we could end up with a mapped range
// much larger than that if we have a small non-zero minimum
// value (less than 1e-10), or a particularly large
// maximum. That's unlikely to give us good results, so let's
// insist that the mapped log range has no more than 10
// difference between min and max, to match the behaviour when
// min == 0 at the input.
//
double threshold = -10.0;
LogRange::mapRange(m_mappedMin, m_mappedMax, threshold);
if (m_mappedMin < m_mappedMax + threshold) {
m_mappedMin = m_mappedMax + threshold;
}
} else if (m_params.scaleType == ColourScaleType::PlusMinusOne) {
m_mappedMin = -1.0;
m_mappedMax = 1.0;
} else if (m_params.scaleType == ColourScaleType::Absolute) {
m_mappedMin = fabs(m_mappedMin);
m_mappedMax = fabs(m_mappedMax);
if (m_mappedMin >= m_mappedMax) {
std::swap(m_mappedMin, m_mappedMax);
}
}
if (m_mappedMin >= m_mappedMax) {
SVCERR << "ERROR: ColourScale::ColourScale: minValue = " << m_params.minValue
<< ", maxValue = " << m_params.maxValue
<< ", threshold = " << m_params.threshold
<< ", scale = " << int(m_params.scaleType)
<< " resulting in mapped minValue = " << m_mappedMin
<< ", mapped maxValue = " << m_mappedMax << endl;
throw std::logic_error("maxValue must be greater than minValue [after mapping]");
}
}
ColourScale::~ColourScale()
{
}
ColourScaleType
ColourScale::getScale() const
{
return m_params.scaleType;
}
int
ColourScale::getPixelGeneral(double value) const
{
double maxPixF = m_maxPixel;
if (m_params.scaleType == ColourScaleType::Phase) {
double half = (maxPixF - 1.f) / 2.f;
int pixel = 1 + int((value * half) / M_PI + half);
// SVCERR << "phase = " << value << " pixel = " << pixel << endl;
return pixel;
}
value *= m_params.gain;
if (value < m_params.threshold) return 0;
double mapped = value;
if (m_params.scaleType == ColourScaleType::Log) {
mapped = LogRange::map(value);
} else if (m_params.scaleType == ColourScaleType::PlusMinusOne) {
if (mapped < -1.f) mapped = -1.f;
if (mapped > 1.f) mapped = 1.f;
} else if (m_params.scaleType == ColourScaleType::Absolute) {
if (mapped < 0.f) mapped = -mapped;
}
mapped *= m_params.multiple;
if (mapped < m_mappedMin) {
mapped = m_mappedMin;
}
if (mapped > m_mappedMax) {
mapped = m_mappedMax;
}
double proportion = (mapped - m_mappedMin) / (m_mappedMax - m_mappedMin);
int pixel = 0;
if (m_params.scaleType == ColourScaleType::Meter) {
pixel = AudioLevel::voltage_to_fader(proportion, m_maxPixel-1,
AudioLevel::Scale::Preview) + 1;
} else {
pixel = int(proportion * maxPixF) + 1;
}
if (pixel < 0) {
pixel = 0;
}
if (pixel > m_maxPixel) {
pixel = m_maxPixel;
}
return pixel;
}
QColor
ColourScale::getColourForPixel(int pixel, int rotation) const
{
if (pixel < 0) {
pixel = 0;
}
if (pixel > m_maxPixel) {
pixel = m_maxPixel;
}
if (pixel == 0) {
if (m_mapper.hasLightBackground()) {
return Qt::white;
} else {
return Qt::black;
}
} else {
int target = int(pixel) + rotation;
while (target < 1) target += m_maxPixel;
while (target > m_maxPixel) target -= m_maxPixel;
return m_mapper.map(double(target));
}
}
} // end namespace sv
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