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/* ------------------------- scale ------------------------------------------ */
/* */
/* Scales 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 = "scale v0.2, written by Olaf Matthes <olaf.matthes@gmx.de>";
typedef struct scale
{
t_object x_ob;
t_float x_f; /* current input value */
t_float x_il; /* low border of input range */
t_float x_ih; /* high border of input range */
t_float x_ol; /* low border of output range */
t_float x_oh; /* high border of output range */
t_float x_logcoeff; /* log-coefficient */
t_outlet *x_outlet1; /* result */
} t_scale;
static void scale_float(t_scale *x, t_floatarg f)
{
t_float ir = x->x_ih - x->x_il;
t_float or = x->x_oh - x->x_ol;
double oq;
double result;
double k;
if(ir == 0)
{
post("scale: input range must not be 0");
return;
}
/* we accept an output range of 0 in case someone really wants this */
if(!x->x_logcoeff) /* linear */
{
k = (or / ir);
result = ((f - x->x_il) * k) + x->x_ol;
}
else /* logarythmical scale */
{
oq = x->x_oh / x->x_ol;
// k = (log((double)oq)/log(x->x_logcoeff))/((double)ir);
k = log((double)oq)/((double)ir);
if(x->x_ol)
{
// result = (double)x->x_ol*exp(k*(double)(f - x->x_il)*log(x->x_logcoeff));
result = (double)x->x_ol*exp(k*(double)(f - x->x_il));
}
else
{
/* in case the low output is 0 we have to cheat... */
/* okay, here's the chating: we calculate for a lower out limit
of 1 and remove this shift after the calculation */
result = ((double)(x->x_ol+1)*exp(k*(double)(f - x->x_il)))-1.0;
}
}
x->x_f = f; /* save current input value */
outlet_float(x->x_outlet1, result);
}
static void scale_bang(t_scale *x)
{
scale_float(x, x->x_f); /* recalculate result */
}
static t_class *scale_class;
static void *scale_new(t_floatarg fil, t_floatarg fih, t_floatarg fol, t_floatarg foh, t_floatarg flc)
{
t_scale *x = (t_scale *)pd_new(scale_class);
floatinlet_new(&x->x_ob, &x->x_il);
floatinlet_new(&x->x_ob, &x->x_ih);
floatinlet_new(&x->x_ob, &x->x_ol);
floatinlet_new(&x->x_ob, &x->x_oh);
floatinlet_new(&x->x_ob, &x->x_logcoeff);
x->x_outlet1 = outlet_new(&x->x_ob, gensym("float"));
/* default values taken from Max's scale */
x->x_il = fil;
x->x_ih = fih;
if(!x->x_ih)x->x_ih = 127.0;
x->x_ol = fol;
x->x_oh = foh;
if(!x->x_oh)x->x_oh = 1.0;
x->x_logcoeff = flc;
x->x_f = 0;
#ifndef MAXLIB
post(version);
#endif
return (void *)x;
}
void scale_setup(void)
{
scale_class = class_new(gensym("scale"), (t_newmethod)scale_new,
0, sizeof(t_scale), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addfloat(scale_class, scale_float);
class_addbang(scale_class, scale_bang);
#ifndef MAXLIB
class_sethelpsymbol(scale_class, gensym("help-scale.pd"));
#else
class_sethelpsymbol(scale_class, gensym("maxlib/help-scale.pd"));
#endif
}
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