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/* -------------------------- step ------------------------------------------ */
/* */
/* Step to a new value in N milliseconds (similar to line). */
/* 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"
/* -------------------------- step ------------------------------ */
static char *version = "step v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
static t_class *step_class;
typedef struct _step
{
t_object x_obj;
t_clock *x_clock;
double x_targettime;
t_float x_targetval;
double x_prevtime;
t_float x_setval;
int x_gotinlet;
t_float x_grain; /* time interval for output */
t_float x_step; /* step size for output */
t_float x_steptime; /* length for one step */
t_int x_stepcall;
double x_1overtimediff;
double x_in1val;
} t_step;
static void step_tick(t_step *x)
{
t_float outvalue;
double timenow = clock_getsystime();
double msectogo = - clock_gettimesince(x->x_targettime);
if (msectogo < 1E-9)
{
outlet_float(x->x_obj.ob_outlet, x->x_targetval);
}
else
{
if(x->x_setval < x->x_targetval)
{ /* count upwards */
outvalue = x->x_setval + x->x_stepcall * x->x_step;
}
else
{ /* count downwards */
outvalue = x->x_setval - x->x_stepcall * x->x_step;
}
outlet_float(x->x_obj.ob_outlet, outvalue);
clock_delay(x->x_clock, (x->x_steptime > msectogo ? msectogo : x->x_steptime));
}
x->x_stepcall++;
}
static void step_float(t_step *x, t_float f)
{
double timenow = clock_getsystime();
if (x->x_gotinlet && x->x_in1val > 0 && x->x_step != 0 && f != x->x_setval)
{
if (timenow > x->x_targettime) x->x_setval = x->x_targetval;
else x->x_setval = x->x_setval + x->x_1overtimediff *
(timenow - x->x_prevtime)
* (x->x_targetval - x->x_setval);
x->x_prevtime = timenow;
x->x_targetval = f; /* where to end */
x->x_stepcall = 0;
/* how long does it take ? */
x->x_targettime = clock_getsystimeafter(x->x_in1val);
if(x->x_setval < x->x_targetval)
{
x->x_steptime = x->x_in1val / (int)((x->x_targetval - x->x_setval) / x->x_step);
}
else
{
x->x_steptime = x->x_in1val / (int)((x->x_setval - x->x_targetval) / x->x_step);
}
// post("steptime %g", x->x_steptime);
step_tick(x);
x->x_gotinlet = 0;
x->x_1overtimediff = 1./ (x->x_targettime - timenow);
/* call tick function */
clock_delay(x->x_clock, x->x_steptime);
}
else
{
clock_unset(x->x_clock);
x->x_targetval = x->x_setval = f;
outlet_float(x->x_obj.ob_outlet, f);
}
x->x_gotinlet = 0;
}
static void step_ft1(t_step *x, t_floatarg g)
{
x->x_in1val = g;
x->x_gotinlet = 1;
}
static void step_ft2(t_step *x, t_floatarg g)
{
if (g <= 0) g = 1;
x->x_step = g;
x->x_gotinlet = 1;
}
static void step_stop(t_step *x)
{
x->x_targetval = x->x_setval;
clock_unset(x->x_clock);
}
static void step_free(t_step *x)
{
clock_free(x->x_clock);
}
static void *step_new(t_floatarg f, t_floatarg step, t_floatarg grain)
{
t_step *x = (t_step *)pd_new(step_class);
x->x_targetval = x->x_setval = f;
x->x_gotinlet = 0;
x->x_1overtimediff = 1;
x->x_clock = clock_new(x, (t_method)step_tick);
x->x_targettime = x->x_prevtime = clock_getsystime();
if (grain <= 0) grain = 20;
x->x_grain = grain;
if (step <= 0) step = 1;
x->x_step = step;
outlet_new(&x->x_obj, gensym("float"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft2"));
return (x);
}
#ifndef MAXLIB
void step_setup(void)
{
step_class = class_new(gensym("step"), (t_newmethod)step_new,
(t_method)step_free, sizeof(t_step), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(step_class, (t_method)step_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(step_class, (t_method)step_ft2, gensym("ft2"), A_FLOAT, 0);
class_addmethod(step_class, (t_method)step_stop, gensym("stop"), 0);
class_addfloat(step_class, (t_method)step_float);
post(version);
}
#else
void maxlib_step_setup(void)
{
step_class = class_new(gensym("maxlib_step"), (t_newmethod)step_new,
(t_method)step_free, sizeof(t_step), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addcreator((t_newmethod)step_new, gensym("step"), A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(step_class, (t_method)step_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(step_class, (t_method)step_ft2, gensym("ft2"), A_FLOAT, 0);
class_addmethod(step_class, (t_method)step_stop, gensym("stop"), 0);
class_addfloat(step_class, (t_method)step_float);
class_sethelpsymbol(step_class, gensym("maxlib/step-help.pd"));
}
#endif
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