/
visualize.cpp
1564 lines (1312 loc) · 43.7 KB
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visualize.cpp
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/*
visualize.cpp
(c) 2003 Thor Sigvaldason and Isaac Richards
VERY closely based on code from mq3 by Brad Hughes
Part of the mythTV project
music visualizers
*/
// C
#include <cmath>
// C++
#include <iostream>
using namespace std;
// Qt
#include <QCoreApplication>
#include <QPainter>
#include <QImage>
// MythTV
#include <mythdbcon.h>
#include <mythcontext.h>
#include <mythuihelper.h>
#include <remotefile.h>
#include <musicmetadata.h>
// mythmusic
#include "mainvisual.h"
#include "visualize.h"
#include "inlines.h"
#include "decoder.h"
#include "musicplayer.h"
#define FFTW_N 512
// static_assert(FFTW_N==SAMPLES_DEFAULT_SIZE)
VisFactory* VisFactory::g_pVisFactories = nullptr;
VisualBase::VisualBase(bool screensaverenable)
: m_xscreensaverenable(screensaverenable)
{
if (!m_xscreensaverenable)
GetMythUI()->DoDisableScreensaver();
}
VisualBase::~VisualBase()
{
//
// This is only here so
// that derived classes
// can destruct properly
//
if (!m_xscreensaverenable)
GetMythUI()->DoRestoreScreensaver();
}
void VisualBase::drawWarning(QPainter *p, const QColor &back, const QSize &size, QString warning, int fontSize)
{
p->fillRect(0, 0, size.width(), size.height(), back);
p->setPen(Qt::white);
QFont font = GetMythUI()->GetMediumFont();
font.setPointSizeF(fontSize * (size.width() / 800.0));
p->setFont(font);
p->drawText(0, 0, size.width(), size.height(), Qt::AlignVCenter | Qt::AlignHCenter | Qt::TextWordWrap, warning);
}
///////////////////////////////////////////////////////////////////////////////
// LogScale
LogScale::LogScale(int maxscale, int maxrange)
{
setMax(maxscale, maxrange);
}
LogScale::~LogScale()
{
delete [] m_indices;
}
void LogScale::setMax(int maxscale, int maxrange)
{
if (maxscale == 0 || maxrange == 0)
return;
m_s = maxscale;
m_r = maxrange;
delete [] m_indices;
double alpha;
long double domain = (long double) maxscale;
long double range = (long double) maxrange;
long double x = 1.0;
long double dx = 1.0;
long double e4 = 1.0E-8;
m_indices = new int[maxrange];
for (int i = 0; i < maxrange; i++)
m_indices[i] = 0;
// initialize log scale
for (uint i=0; i<10000 && (std::abs(dx) > e4); i++)
{
double t = std::log((domain + x) / x);
double y = (x * t) - range;
double yy = t - (domain / (x + domain));
dx = y / yy;
x -= dx;
}
alpha = x;
for (int i = 1; i < (int) domain; i++)
{
int scaled = (int) floor(0.5 + (alpha * log((double(i) + alpha) / alpha)));
if (scaled < 1)
scaled = 1;
if (m_indices[scaled - 1] < i)
m_indices[scaled - 1] = i;
}
}
int LogScale::operator[](int index)
{
return m_indices[index];
}
///////////////////////////////////////////////////////////////////////////////
// StereoScope
StereoScope::StereoScope()
{
m_fps = 45;
}
void StereoScope::resize( const QSize &newsize )
{
m_size = newsize;
uint os = m_magnitudes.size();
m_magnitudes.resize( m_size.width() * 2 );
for ( ; os < m_magnitudes.size(); os++ )
m_magnitudes[os] = 0.0;
}
bool StereoScope::process( VisualNode *node )
{
bool allZero = true;
if (node)
{
double index = 0;
double const step = (double)SAMPLES_DEFAULT_SIZE / m_size.width();
for ( int i = 0; i < m_size.width(); i++)
{
unsigned long indexTo = (unsigned long)(index + step);
if (indexTo == (unsigned long)(index))
indexTo = (unsigned long)(index + 1);
double valL = 0, valR = 0;
#if RUBBERBAND
if ( m_rubberband ) {
valL = m_magnitudes[ i ];
valR = m_magnitudes[ i + m_size.width() ];
if (valL < 0.) {
valL += m_falloff;
if ( valL > 0. )
valL = 0.;
}
else
{
valL -= m_falloff;
if ( valL < 0. )
valL = 0.;
}
if (valR < 0.)
{
valR += m_falloff;
if ( valR > 0. )
valR = 0.;
}
else
{
valR -= m_falloff;
if ( valR < 0. )
valR = 0.;
}
}
#endif
for (unsigned long s = (unsigned long)index; s < indexTo && s < node->m_length; s++)
{
double tmpL = ( ( node->m_left ?
double( node->m_left[s] ) : 0.) *
double( m_size.height() / 4 ) ) / 32768.;
double tmpR = ( ( node->m_right ?
double( node->m_right[s]) : 0.) *
double( m_size.height() / 4 ) ) / 32768.;
if (tmpL > 0)
valL = (tmpL > valL) ? tmpL : valL;
else
valL = (tmpL < valL) ? tmpL : valL;
if (tmpR > 0)
valR = (tmpR > valR) ? tmpR : valR;
else
valR = (tmpR < valR) ? tmpR : valR;
}
if (valL != 0. || valR != 0.)
allZero = false;
m_magnitudes[ i ] = valL;
m_magnitudes[ i + m_size.width() ] = valR;
index = index + step;
}
#if RUBBERBAND
}
else if (m_rubberband)
{
for ( int i = 0; i < m_size.width(); i++)
{
double valL = m_magnitudes[ i ];
if (valL < 0) {
valL += 2;
if (valL > 0.)
valL = 0.;
} else {
valL -= 2;
if (valL < 0.)
valL = 0.;
}
double valR = m_magnitudes[ i + m_size.width() ];
if (valR < 0.) {
valR += m_falloff;
if (valR > 0.)
valR = 0.;
}
else
{
valR -= m_falloff;
if (valR < 0.)
valR = 0.;
}
if (valL != 0. || valR != 0.)
allZero = false;
m_magnitudes[ i ] = valL;
m_magnitudes[ i + m_size.width() ] = valR;
}
#endif
}
else
{
for ( int i = 0; (unsigned) i < m_magnitudes.size(); i++ )
m_magnitudes[ i ] = 0.;
}
return allZero;
}
bool StereoScope::draw( QPainter *p, const QColor &back )
{
p->fillRect(0, 0, m_size.width(), m_size.height(), back);
for ( int i = 1; i < m_size.width(); i++ )
{
#if TWOCOLOUR
double r, g, b, per;
// left
per = double( m_magnitudes[ i ] * 2 ) /
double( m_size.height() / 4 );
if (per < 0.0)
per = -per;
if (per > 1.0)
per = 1.0;
else if (per < 0.0)
per = 0.0;
r = m_startColor.red() + (m_targetColor.red() -
m_startColor.red()) * (per * per);
g = m_startColor.green() + (m_targetColor.green() -
m_startColor.green()) * (per * per);
b = m_startColor.blue() + (m_targetColor.blue() -
m_startColor.blue()) * (per * per);
if (r > 255.0)
r = 255.0;
else if (r < 0.0)
r = 0;
if (g > 255.0)
g = 255.0;
else if (g < 0.0)
g = 0;
if (b > 255.0)
b = 255.0;
else if (b < 0.0)
b = 0;
p->setPen( QColor( int(r), int(g), int(b) ) );
#else
p->setPen(Qt::red);
#endif
p->drawLine( i - 1, (int)((m_size.height() / 4) + m_magnitudes[i - 1]),
i, (int)((m_size.height() / 4) + m_magnitudes[i]));
#if TWOCOLOUR
// right
per = double( m_magnitudes[ i + m_size.width() ] * 2 ) /
double( m_size.height() / 4 );
if (per < 0.0)
per = -per;
if (per > 1.0)
per = 1.0;
else if (per < 0.0)
per = 0.0;
r = m_startColor.red() + (m_targetColor.red() -
m_startColor.red()) * (per * per);
g = m_startColor.green() + (m_targetColor.green() -
m_startColor.green()) * (per * per);
b = m_startColor.blue() + (m_targetColor.blue() -
m_startColor.blue()) * (per * per);
if (r > 255.0)
r = 255.0;
else if (r < 0.0)
r = 0;
if (g > 255.0)
g = 255.0;
else if (g < 0.0)
g = 0;
if (b > 255.0)
b = 255.0;
else if (b < 0.0)
b = 0;
p->setPen( QColor( int(r), int(g), int(b) ) );
#else
p->setPen(Qt::red);
#endif
p->drawLine( i - 1, (int)((m_size.height() * 3 / 4) +
m_magnitudes[i + m_size.width() - 1]),
i, (int)((m_size.height() * 3 / 4) +
m_magnitudes[i + m_size.width()]));
}
return true;
}
///////////////////////////////////////////////////////////////////////////////
// MonoScope
bool MonoScope::process( VisualNode *node )
{
bool allZero = true;
if (node)
{
double index = 0;
double const step = (double)SAMPLES_DEFAULT_SIZE / m_size.width();
for (int i = 0; i < m_size.width(); i++)
{
unsigned long indexTo = (unsigned long)(index + step);
if (indexTo == (unsigned long)index)
indexTo = (unsigned long)(index + 1);
double val = 0;
#if RUBBERBAND
if ( m_rubberband )
{
val = m_magnitudes[ i ];
if (val < 0.)
{
val += m_falloff;
if ( val > 0. )
{
val = 0.;
}
}
else
{
val -= m_falloff;
if ( val < 0. )
{
val = 0.;
}
}
}
#endif
for (unsigned long s = (unsigned long)index; s < indexTo && s < node->m_length; s++)
{
double tmp = ( double( node->m_left[s] ) +
(node->m_right ? double( node->m_right[s] ) : 0) *
double( m_size.height() / 2 ) ) / 65536.;
if (tmp > 0)
{
val = (tmp > val) ? tmp : val;
}
else
{
val = (tmp < val) ? tmp : val;
}
}
if ( val != 0. )
{
allZero = false;
}
m_magnitudes[ i ] = val;
index = index + step;
}
}
#if RUBBERBAND
else if (m_rubberband)
{
for (int i = 0; i < m_size.width(); i++) {
double val = m_magnitudes[ i ];
if (val < 0) {
val += 2;
if (val > 0.)
val = 0.;
} else {
val -= 2;
if (val < 0.)
val = 0.;
}
if ( val != 0. )
allZero = false;
m_magnitudes[ i ] = val;
}
}
#endif
else
{
for (int i = 0; i < m_size.width(); i++ )
m_magnitudes[ i ] = 0.;
}
return allZero;
}
bool MonoScope::draw( QPainter *p, const QColor &back )
{
p->fillRect( 0, 0, m_size.width(), m_size.height(), back );
for ( int i = 1; i < m_size.width(); i++ ) {
#if TWOCOLOUR
double r, g, b, per;
per = double( m_magnitudes[ i ] ) /
double( m_size.height() / 4 );
if (per < 0.0)
per = -per;
if (per > 1.0)
per = 1.0;
else if (per < 0.0)
per = 0.0;
r = m_startColor.red() + (m_targetColor.red() -
m_startColor.red()) * (per * per);
g = m_startColor.green() + (m_targetColor.green() -
m_startColor.green()) * (per * per);
b = m_startColor.blue() + (m_targetColor.blue() -
m_startColor.blue()) * (per * per);
if (r > 255.0)
r = 255.0;
else if (r < 0.0)
r = 0;
if (g > 255.0)
g = 255.0;
else if (g < 0.0)
g = 0;
if (b > 255.0)
b = 255.0;
else if (b < 0.0)
b = 0;
p->setPen(QColor(int(r), int(g), int(b)));
#else
p->setPen(Qt::red);
#endif
p->drawLine( i - 1, (int)(m_size.height() / 2 + m_magnitudes[ i - 1 ]),
i, (int)(m_size.height() / 2 + m_magnitudes[ i ] ));
}
return true;
}
///////////////////////////////////////////////////////////////////////////////
// StereoScopeFactory
static class StereoScopeFactory : public VisFactory
{
public:
const QString &name(void) const override // VisFactory
{
static QString name = QCoreApplication::translate("Visualizers",
"StereoScope");
return name;
}
uint plugins(QStringList *list) const override // VisFactory
{
*list << name();
return 1;
}
VisualBase *create(MainVisual */*parent*/, const QString &/*pluginName*/) const override // VisFactory
{
return new StereoScope();
}
}StereoScopeFactory;
///////////////////////////////////////////////////////////////////////////////
// MonoScopeFactory
static class MonoScopeFactory : public VisFactory
{
public:
const QString &name(void) const override // VisFactory
{
static QString name = QCoreApplication::translate("Visualizers",
"MonoScope");
return name;
}
uint plugins(QStringList *list) const override // VisFactory
{
*list << name();
return 1;
}
VisualBase *create(MainVisual */*parent*/, const QString &/*pluginName*/) const override // VisFactory
{
return new MonoScope();
}
}MonoScopeFactory;
///////////////////////////////////////////////////////////////////////////////
// Spectrum
//
// NOTE: This visualiser requires mythplugins to be compiled with --enable-fft
#if FFTW3_SUPPORT
Spectrum::Spectrum()
{
LOG(VB_GENERAL, LOG_INFO, QString("Spectrum : Being Initialised"));
m_fps = 15;
m_lin = (myth_fftw_float*) av_malloc(sizeof(myth_fftw_float)*FFTW_N);
m_rin = (myth_fftw_float*) av_malloc(sizeof(myth_fftw_float)*FFTW_N);
m_lout = (myth_fftw_complex*) av_malloc(sizeof(myth_fftw_complex)*(FFTW_N/2+1));
m_rout = (myth_fftw_complex*) av_malloc(sizeof(myth_fftw_complex)*(FFTW_N/2+1));
m_lplan = fftw_plan_dft_r2c_1d(FFTW_N, m_lin, (myth_fftw_complex_cast*)m_lout, FFTW_MEASURE);
m_rplan = fftw_plan_dft_r2c_1d(FFTW_N, m_rin, (myth_fftw_complex_cast*)m_rout, FFTW_MEASURE);
}
Spectrum::~Spectrum()
{
if (m_lin)
av_free(m_lin);
if (m_rin)
av_free(m_rin);
if (m_lout)
av_free(m_lout);
if (m_rout)
av_free(m_rout);
fftw_destroy_plan(m_lplan);
fftw_destroy_plan(m_rplan);
}
void Spectrum::resize(const QSize &newsize)
{
// Just change internal data about the
// size of the pixmap to be drawn (ie. the
// size of the screen) and the logically
// ensuing number of up/down bars to hold
// the audio magnitudes
m_size = newsize;
m_analyzerBarWidth = m_size.width() / 64;
if (m_analyzerBarWidth < 6)
m_analyzerBarWidth = 6;
m_scale.setMax(192, m_size.width() / m_analyzerBarWidth);
m_rects.resize( m_scale.range() );
unsigned int i = 0;
int w = 0;
for (; i < (uint)m_rects.size(); i++, w += m_analyzerBarWidth)
{
m_rects[i].setRect(w, m_size.height() / 2, m_analyzerBarWidth - 1, 1);
}
unsigned int os = m_magnitudes.size();
m_magnitudes.resize( m_scale.range() * 2 );
for (; os < (uint)m_magnitudes.size(); os++)
{
m_magnitudes[os] = 0.0;
}
m_scaleFactor = double( m_size.height() / 2 ) / log( (double)(FFTW_N) );
}
template<typename T> T sq(T a) { return a*a; };
bool Spectrum::process(VisualNode *node)
{
// Take a bunch of data in *node
// and break it down into spectrum
// values
bool allZero = true;
uint i;
long w = 0, index;
QRect *rectsp = m_rects.data();
double *magnitudesp = m_magnitudes.data();
if (node)
{
i = node->m_length;
if (i > FFTW_N)
i = FFTW_N;
fast_real_set_from_short(m_lin, node->m_left, i);
if (node->m_right)
fast_real_set_from_short(m_rin, node->m_right, i);
}
else
i = 0;
fast_reals_set(m_lin + i, m_rin + i, 0, FFTW_N - i);
fftw_execute(m_lplan);
fftw_execute(m_rplan);
index = 1;
for (i = 0; (int)i < m_rects.size(); i++, w += m_analyzerBarWidth)
{
// The 1D output is Hermitian symmetric (Yk = Yn-k) so Yn = Y0 etc.
// The dft_r2c_1d plan doesn't output these redundant values
// and furthermore they're not allocated in the ctor
double tmp = 2 * sq(real(m_lout[index])); // + sq(real(m_lout[FFTW_N - index]));
double magL = (tmp > 1.) ? (log(tmp) - 22.0) * m_scaleFactor : 0.;
tmp = 2 * sq(real(m_rout[index])); // + sq(real(m_rout[FFTW_N - index]));
double magR = (tmp > 1.) ? (log(tmp) - 22.0) * m_scaleFactor : 0.;
if (magL > m_size.height() / 2)
{
magL = m_size.height() / 2;
}
if (magL < magnitudesp[i])
{
tmp = magnitudesp[i] - m_falloff;
if ( tmp < magL )
{
tmp = magL;
}
magL = tmp;
}
if (magL < 1.)
{
magL = 1.;
}
if (magR > m_size.height() / 2)
{
magR = m_size.height() / 2;
}
if (magR < magnitudesp[i + m_scale.range()])
{
tmp = magnitudesp[i + m_scale.range()] - m_falloff;
if ( tmp < magR )
{
tmp = magR;
}
magR = tmp;
}
if (magR < 1.)
{
magR = 1.;
}
if (magR != 1 || magL != 1)
{
allZero = false;
}
magnitudesp[i] = magL;
magnitudesp[i + m_scale.range()] = magR;
rectsp[i].setTop( m_size.height() / 2 - int( magL ) );
rectsp[i].setBottom( m_size.height() / 2 + int( magR ) );
index = m_scale[i];
}
Q_UNUSED(allZero);
return false;
}
double Spectrum::clamp(double cur, double max, double min)
{
if (cur > max)
cur = max;
if (cur < min)
cur = min;
return cur;
}
bool Spectrum::draw(QPainter *p, const QColor &back)
{
// This draws on a pixmap owned by MainVisual.
//
// In other words, this is not a Qt Widget, it
// just uses some Qt methods to draw on a pixmap.
// MainVisual then bitblts that onto the screen.
QRect *rectsp = m_rects.data();
p->fillRect(0, 0, m_size.width(), m_size.height(), back);
for (uint i = 0; i < (uint)m_rects.size(); i++)
{
double per = double( rectsp[i].height() - 2 ) / double( m_size.height() );
per = clamp(per, 1.0, 0.0);
double r = m_startColor.red() +
(m_targetColor.red() - m_startColor.red()) * (per * per);
double g = m_startColor.green() +
(m_targetColor.green() - m_startColor.green()) * (per * per);
double b = m_startColor.blue() +
(m_targetColor.blue() - m_startColor.blue()) * (per * per);
r = clamp(r, 255.0, 0.0);
g = clamp(g, 255.0, 0.0);
b = clamp(b, 255.0, 0.0);
if(rectsp[i].height() > 4)
p->fillRect(rectsp[i], QColor(int(r), int(g), int(b)));
}
return true;
}
static class SpectrumFactory : public VisFactory
{
public:
const QString &name(void) const override // VisFactory
{
static QString name = QCoreApplication::translate("Visualizers",
"Spectrum");
return name;
}
uint plugins(QStringList *list) const override // VisFactory
{
*list << name();
return 1;
}
VisualBase *create(MainVisual */*parent*/, const QString &/*pluginName*/) const override // VisFactory
{
return new Spectrum();
}
}SpectrumFactory;
///////////////////////////////////////////////////////////////////////////////
// Squares
//
// NOTE: This visualiser requires mythplugins to be compiled with --enable-fftw
Squares::Squares()
{
m_fake_height = m_number_of_squares * m_analyzerBarWidth;
}
void Squares::resize (const QSize &newsize) {
// Trick the spectrum analyzer into calculating 16 rectangles
Spectrum::resize (QSize (m_fake_height, m_fake_height));
// We have our own copy, Spectrum has it's own...
m_actualSize = newsize;
}
void Squares::drawRect(QPainter *p, QRect *rect, int i, int c, int w, int h)
{
double r, g, b, per;
int correction = (m_actualSize.width() % m_rects.size ()) / 2;
int x = ((i / 2) * w) + correction;
int y;
if (i % 2 == 0)
{
y = c - h;
per = double(m_fake_height - rect->top()) / double(m_fake_height);
}
else
{
y = c;
per = double(rect->bottom()) / double(m_fake_height);
}
per = clamp(per, 1.0, 0.0);
r = m_startColor.red() +
(m_targetColor.red() - m_startColor.red()) * (per * per);
g = m_startColor.green() +
(m_targetColor.green() - m_startColor.green()) * (per * per);
b = m_startColor.blue() +
(m_targetColor.blue() - m_startColor.blue()) * (per * per);
r = clamp(r, 255.0, 0.0);
g = clamp(g, 255.0, 0.0);
b = clamp(b, 255.0, 0.0);
p->fillRect (x, y, w, h, QColor (int(r), int(g), int(b)));
}
bool Squares::draw(QPainter *p, const QColor &back)
{
p->fillRect (0, 0, m_actualSize.width(), m_actualSize.height(), back);
int w = m_actualSize.width() / (m_rects.size() / 2);
int h = w;
int center = m_actualSize.height() / 2;
QRect *rectsp = m_rects.data();
for (uint i = 0; i < (uint)m_rects.size(); i++)
drawRect(p, &(rectsp[i]), i, center, w, h);
return true;
}
static class SquaresFactory : public VisFactory
{
public:
const QString &name(void) const override // VisFactory
{
static QString name = QCoreApplication::translate("Visualizers",
"Squares");
return name;
}
uint plugins(QStringList *list) const override // VisFactory
{
*list << name();
return 1;
}
VisualBase *create(MainVisual */*parent*/, const QString &/*pluginName*/) const override // VisFactory
{
return new Squares();
}
}SquaresFactory;
#endif // FFTW3_SUPPORT
Piano::Piano()
{
// Setup the "magical" audio coefficients
// required by the Goetzel Algorithm
LOG(VB_GENERAL, LOG_DEBUG, QString("Piano : Being Initialised"));
m_piano_data = (piano_key_data *) malloc(sizeof(piano_key_data) * PIANO_N);
m_audio_data = (piano_audio *) malloc(sizeof(piano_audio) * PIANO_AUDIO_SIZE);
double sample_rate = 44100.0; // TODO : This should be obtained from gPlayer (likely candidate...)
m_fps = 20; // This is the display frequency. We're capturing all audio chunks by defining .process_undisplayed() though.
double concert_A = 440.0;
double semi_tone = pow(2.0, 1.0/12.0);
/* Lowest note on piano is 4 octaves below concert A */
double bottom_A = concert_A / 2.0 / 2.0 / 2.0 / 2.0;
unsigned int key;
double current_freq = bottom_A;
for (key = 0; key < PIANO_N; key++)
{
// This is constant through time
m_piano_data[key].coeff = (goertzel_data)(2.0 * cos(2.0 * M_PI * current_freq / sample_rate));
// Want 20 whole cycles of the current waveform at least
double samples_required = sample_rate/current_freq * 20.0;
if (samples_required > sample_rate/4.0)
{
// For the really low notes, 4 updates a second is good enough...
samples_required = sample_rate/4.0;
}
if (samples_required < sample_rate/(double)m_fps * 0.75)
{ // For the high notes, use as many samples as we need in a display_fps
samples_required = sample_rate/(double)m_fps * 0.75;
}
m_piano_data[key].samples_process_before_display_update = (int)samples_required;
m_piano_data[key].is_black_note = false; // Will be put right in .resize()
current_freq *= semi_tone;
}
zero_analysis();
}
Piano::~Piano()
{
if (m_piano_data)
free(m_piano_data);
if (m_audio_data)
free(m_audio_data);
}
void Piano::zero_analysis(void)
{
unsigned int key;
for (key = 0; key < PIANO_N; key++)
{
// These get updated continously, and must be stored between chunks of audio data
m_piano_data[key].q2 = 0.0F;
m_piano_data[key].q1 = 0.0F;
m_piano_data[key].magnitude = 0.0F;
m_piano_data[key].max_magnitude_seen =
(goertzel_data)(PIANO_RMS_NEGLIGIBLE*PIANO_RMS_NEGLIGIBLE); // This is a guess - will be quickly overwritten
m_piano_data[key].samples_processed = 0;
}
m_offset_processed = 0;
}
void Piano::resize(const QSize &newsize)
{
// Just change internal data about the
// size of the pixmap to be drawn (ie. the
// size of the screen) and the logically
// ensuing number of up/down bars to hold
// the audio magnitudes
m_size = newsize;
LOG(VB_GENERAL, LOG_DEBUG, QString("Piano : Being Resized"));
zero_analysis();
// There are 88-36=52 white notes on piano keyboard
double key_unit_size = (double)m_size.width() / 54.0; // One white key extra spacing, if possible
if (key_unit_size < 10.0) // Keys have to be at least this many pixels wide
key_unit_size = 10.0;
double white_width_pct = .8;
double black_width_pct = .6;
double black_offset_pct = .05;
double white_height_pct = 6;
double black_height_pct = 4;
// This is the starting position of the keyboard (may be beyond LHS)
// - actually position of C below bottom A (will be added to...). This is 4 octaves below middle C.
double left = (double)m_size.width() / 2.0 - (4.0*7.0 + 3.5) * key_unit_size; // The extra 3.5 centers 'F' inthe middle of the screen
double top_of_keys = (double)m_size.height() / 2.0 - key_unit_size * white_height_pct / 2.0; // Vertically center keys
m_rects.resize(PIANO_N);
unsigned int key;
for (key = 0; key < PIANO_N; key++)
{
int note = ((int)key - 3 + 12) % 12; // This means that C=0, C#=1, D=2, etc (since lowest note is bottom A)
if (note == 0) // If we're on a 'C', move the left 'cursor' over an octave
{
left += key_unit_size*7.0;
}
double center = 0.0;
double offset = 0.0;
bool is_black = false;
switch (note)
{
case 0: center = 0.5; break;
case 1: center = 1.0; is_black = true; offset = -1; break;