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/* Copyright (c) 1997-1999 Miller Puckette.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* clock objects */
#include "m_pd.h"
#include <stdio.h>
#define DEFAULTLINEGRAIN 20
static t_class *line_class;
typedef struct _line
{
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;
double x_1overtimediff;
double x_in1val;
} t_line;
static void line_tick(t_line *x)
{
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
{
outlet_float(x->x_obj.ob_outlet,
x->x_setval + x->x_1overtimediff * (timenow - x->x_prevtime)
* (x->x_targetval - x->x_setval));
if (x->x_grain <= 0)
x->x_grain = DEFAULTLINEGRAIN;
clock_delay(x->x_clock,
(x->x_grain > msectogo ? msectogo : x->x_grain));
}
}
static void line_float(t_line *x, t_float f)
{
double timenow = clock_getsystime();
if (x->x_gotinlet && x->x_in1val > 0)
{
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_targettime = clock_getsystimeafter(x->x_in1val);
x->x_targetval = f;
line_tick(x);
x->x_gotinlet = 0;
x->x_1overtimediff = 1./ (x->x_targettime - timenow);
if (x->x_grain <= 0)
x->x_grain = DEFAULTLINEGRAIN;
clock_delay(x->x_clock,
(x->x_grain > x->x_in1val ? x->x_in1val : x->x_grain));
}
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 line_ft1(t_line *x, t_floatarg g)
{
x->x_in1val = g;
x->x_gotinlet = 1;
}
static void line_stop(t_line *x)
{
x->x_targetval = x->x_setval;
clock_unset(x->x_clock);
}
static void line_set(t_line *x, t_floatarg f)
{
clock_unset(x->x_clock);
x->x_targetval = x->x_setval = f;
}
static void line_free(t_line *x)
{
clock_free(x->x_clock);
}
static void *line_new(t_floatarg f, t_floatarg grain)
{
t_line *x = (t_line *)pd_new(line_class);
x->x_targetval = x->x_setval = f;
x->x_gotinlet = 0;
x->x_1overtimediff = 1;
x->x_clock = clock_new(x, (t_method)line_tick);
x->x_targettime = x->x_prevtime = clock_getsystime();
x->x_grain = grain;
outlet_new(&x->x_obj, gensym("float"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
floatinlet_new(&x->x_obj, &x->x_grain);
return (x);
}
void line_setup(void)
{
line_class = class_new(gensym("line"), (t_newmethod)line_new,
(t_method)line_free, sizeof(t_line), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(line_class, (t_method)line_ft1,
gensym("ft1"), A_FLOAT, 0);
class_addmethod(line_class, (t_method)line_stop,
gensym("stop"), 0);
class_addmethod(line_class, (t_method)line_set,
gensym("set"), A_FLOAT, 0);
class_addfloat(line_class, (t_method)line_float);
}
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