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/***************************************************************************
Functions.cpp - list of simple periodic functions
-------------------
begin : Jan 21 2001
copyright : (C) 2001 by Thomas Eschenbacher
email : Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "config.h"
#include <math.h>
#include <QString>
#include <KLocalizedString>
#include "libkwave/Functions.h"
#include "libkwave/String.h"
//***************************************************************************
static double rect(double param)
{
double div = param / (2 * M_PI);
param = param - (floor(div) * (2 * M_PI));
if (param > M_PI) return -1;
return 1;
}
//***************************************************************************
static double sin2(double param)
{
double y = sin(param);
return y*y;
}
//***************************************************************************
static double sin3(double param)
{
double y = sin(param);
return y*y*y;
}
//***************************************************************************
static double saw(double param)
{
double div = param / (2 * M_PI);
param -= (floor(div) * (2 * M_PI));
param /= M_PI;
param -= 1;
return param;
}
//***************************************************************************
static double sawinv(double param)
{
double div = param / (2 * M_PI);
param -= (floor(div) * (2 * M_PI));
param = 2 * M_PI - param;
param /= M_PI;
param -= 1;
return param;
}
//***************************************************************************
static double tri(double param)
{
param += M_PI / 2;
double div = param / (2 * M_PI);
param -= (floor(div) * (2 * M_PI));
if (param > M_PI) return (((param -M_PI) / M_PI)*2)-1;
return (((M_PI -param) / M_PI)*2)-1;
}
//***************************************************************************
static double zero(double)
{
return 0.0;
}
//***************************************************************************
//***************************************************************************
//***************************************************************************
void Kwave::Functions::FunctionTypesMap::fill()
{
append(0, &sin, _("sinus"), kli18n("Sinus"));
append(1, &rect, _("rectangular"), kli18n("Rectangular"));
append(2, &saw, _("sawtooth"), kli18n("Sawtooth"));
append(3, &sawinv, _("inverse_sawtooth"), kli18n("Inverse Sawtooth"));
append(4, &tri, _("triangular"), kli18n("Triangular"));
append(5, &sin2, _("square_sinus"), kli18n("Square Sinus"));
append(6, &sin3, _("cubic_sinus"), kli18n("Cubic Sinus"));
}
//***************************************************************************
Kwave::Functions::Functions()
{
}
//***************************************************************************
Kwave::Functions::~Functions()
{
}
//***************************************************************************
QString Kwave::Functions::name(unsigned int index)
{
Q_ASSERT(index < m_functions_map.count());
if (index >= m_functions_map.count()) return _("Zero");
return m_functions_map.name(index);
}
//***************************************************************************
Kwave::Functions::periodic_function_t &Kwave::Functions::function(
unsigned int index) const
{
Kwave::Functions::periodic_function_t *f = nullptr;
Q_ASSERT(index < m_functions_map.count());
if (index < m_functions_map.count()) f = m_functions_map.data(index);
if (!f) return *(&zero);
return *f;
}
//***************************************************************************
unsigned int Kwave::Functions::count() const
{
return m_functions_map.count();
}
//***************************************************************************
//***************************************************************************
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