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// ------------------------------------------------------------------------
// generic-linear-envelope.cpp: Generic linear envelope
// Copyright (C) 2000-2002,2006,2008,2011 Kai Vehmanen
// Copyright (C) 2001 Arto Hamara
//
// Attributes:
// eca-style-version: 3
//
// This program is fre 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.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
// ------------------------------------------------------------------------
#include <kvu_numtostr.h>
#include <kvu_message_item.h>
#include "generic-linear-envelope.h"
#include "eca-logger.h"
/* Debug controller source values */
// #define DEBUG_CONTROLLERS
#ifdef DEBUG_CONTROLLERS
#define DEBUG_CTRL_STATEMENT(x) x
#else
#define DEBUG_CTRL_STATEMENT(x) ((void)0)
#endif
GENERIC_LINEAR_ENVELOPE::GENERIC_LINEAR_ENVELOPE(void)
{
pos_rep.resize(1);
val_rep.resize(1);
curstage = -2; /* processing not yet started */
pos_rep[0] = 0;
val_rep[0] = 0;
set_param_count(0);
}
GENERIC_LINEAR_ENVELOPE::~GENERIC_LINEAR_ENVELOPE(void)
{
}
bool GENERIC_LINEAR_ENVELOPE::is_valid_for_stage(double pos, int stage) const
{
if ((stage >= 0) &&
(stage < static_cast<int>(pos_rep.size()-1)) &&
(pos >= pos_rep[stage]) &&
(pos < pos_rep[stage+1]))
return true;
return false;
}
void GENERIC_LINEAR_ENVELOPE::set_stage(double curpos)
{
/* case: init not called yet */
if (curstage == -2)
return;
if (curpos < pos_rep[0]) {
curstage = -1;
return;
}
int n;
for(n = 0; n < static_cast<int>(pos_rep.size() - 1); n++) {
if (curpos < pos_rep[n + 1]) {
break;
}
}
curstage = n;
}
CONTROLLER_SOURCE::parameter_t GENERIC_LINEAR_ENVELOPE::value(double curpos)
{
if (is_valid_for_stage(curpos, curstage)) {
curval = (((curpos - pos_rep[curstage]) * val_rep[curstage+1] +
(pos_rep[curstage+1] - curpos) * val_rep[curstage]) /
(pos_rep[curstage+1] - pos_rep[curstage]));
}
else {
set_stage(curpos);
if (is_valid_for_stage(curpos, curstage))
return value(curpos);
if (curstage < 0)
curval = val_rep[0];
else
curval = val_rep.back();
}
DEBUG_CTRL_STATEMENT(std::cerr << "generic-linear-envelope: type '"
<< name()
<< "', pos " << curpos
<< ", value " << curval
<< ", stage " << curstage << "." << std::endl);
return curval;
}
void GENERIC_LINEAR_ENVELOPE::init(void)
{
curval = 0.0f;
curstage = -1; /* processing started */
ECA_LOG_MSG(ECA_LOGGER::info, "Envelope created.");
}
void GENERIC_LINEAR_ENVELOPE::set_param_count(int params)
{
param_names_rep = "point_count";
if (params > 0) {
for(int n = 0; n < params; ++n) {
param_names_rep += ",pos";
param_names_rep += kvu_numtostr(n + 1);
param_names_rep += ",val";
param_names_rep += kvu_numtostr(n + 1);
}
}
}
std::string GENERIC_LINEAR_ENVELOPE::parameter_names(void) const
{
return param_names_rep;
}
void GENERIC_LINEAR_ENVELOPE::set_parameter(int param, parameter_t value)
{
switch(param) {
case 1:
set_param_count(static_cast<int>(value));
pos_rep.resize(static_cast<int>(value));
val_rep.resize(static_cast<int>(value));
break;
default:
int pointnum = param/2 - 1;
if (pointnum >= static_cast<int>(pos_rep.size()))
break;
if (param % 2 == 0)
pos_rep[pointnum] = value;
else
val_rep[pointnum] = value;
}
}
CONTROLLER_SOURCE::parameter_t GENERIC_LINEAR_ENVELOPE::get_parameter(int param) const
{
switch(param) {
case 1:
return static_cast<parameter_t>(pos_rep.size());
break;
default:
int pointnum = param/2 - 1;
if (pointnum >= static_cast<int>(pos_rep.size())) {
return 0.0f;
}
if (param % 2 == 0)
return pos_rep[pointnum];
else
return val_rep[pointnum];
}
}
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