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/* ------------------------- limit ------------------------------------------ */
/* */
/* limits input to lie within an output range. */
/* Written by Olaf Matthes <olaf.matthes@gmx.de> */
/* Get source at http://www.akustische-kunst.org/puredata/maxlib/ */
/* */
/* 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. */
/* */
/* 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. */
/* */
/* Based on PureData by Miller Puckette and others. */
/* */
/* ---------------------------------------------------------------------------- */
#include "m_pd.h"
#include <stdio.h>
#include <math.h>
static char *version = "limit v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
typedef struct limit
{
t_object x_ob;
t_float x_ol; /* low border of output range */
t_float x_oh; /* high border of output range */
t_float x_ratio; /* 'compression ratio' */
t_outlet *x_outlet1; /* result */
t_float x_f;
} t_limit;
static void limit_float(t_limit *x, t_floatarg f)
{
if(x->x_oh < x->x_ol) /* swap values */
{
int i = x->x_oh;
x->x_oh = x->x_ol;
x->x_ol = i;
}
if(x->x_ratio == 0) /* 'clip' mode */
{
if(f > x->x_oh)f = x->x_oh;
else if(f < x->x_ol)f = x->x_ol;
}
else /* 'compress' mode */
{
int diff;
if(f > x->x_oh)
{
diff = f - x->x_oh;
f = x->x_oh + (diff / x->x_ratio);
}
else if(f < x->x_ol)
{
diff = x->x_ol - f;
f = x->x_ol - (diff / x->x_ratio);
}
}
outlet_float(x->x_outlet1, f);
x->x_f = f;
}
static void limit_bang(t_limit *x)
{
limit_float(x, x->x_f); /* recalculate result */
}
static t_class *limit_class;
static void *limit_new(t_floatarg fol, t_floatarg foh, t_floatarg fr)
{
t_limit *x = (t_limit *)pd_new(limit_class);
floatinlet_new(&x->x_ob, &x->x_ol);
floatinlet_new(&x->x_ob, &x->x_oh);
floatinlet_new(&x->x_ob, &x->x_ratio);
x->x_outlet1 = outlet_new(&x->x_ob, gensym("float"));
/* default values taken from Max's limit */
x->x_ol = fol;
x->x_oh = foh;
if(x->x_oh < x->x_ol) /* swap values */
{
int i = x->x_oh;
x->x_oh = x->x_ol;
x->x_ol = i;
}
x->x_ratio = fr;
x->x_f = 0;
return (void *)x;
}
#ifndef MAXLIB
void limit_setup(void)
{
limit_class = class_new(gensym("limit"), (t_newmethod)limit_new,
0, sizeof(t_limit), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
#else
void maxlib_limit_setup(void)
{
limit_class = class_new(gensym("maxlib_limit"), (t_newmethod)limit_new,
0, sizeof(t_limit), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addcreator((t_newmethod)limit_new, gensym("limit"), A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
#endif
class_addfloat(limit_class, limit_float);
class_addbang(limit_class, limit_bang);
#ifndef MAXLIB
post(version);
#else
class_sethelpsymbol(limit_class, gensym("maxlib/limit-help.pd"));
#endif
}
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