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/* ------------------------- velocity ----------------------------------------- */
/* */
/* Get velocity of input in digits per second. */
/* Written by Olaf Matthes (olaf.matthes@gmx.de) */
/* Originally written for Max by Trond Lossius. */
/* 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. */
/* */
/* You should have received a copy of the GNU Lesser General Public */
/* License along with this library; 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. */
/* */
/* ---------------------------------------------------------------------------- */
// velocity.c: (1000*(x[n]-x[n-1]))/Ęt
// (C) Trond Lossius/BEK 2000
// Last revision: 4/7 2000
//
// Input:
// float
// int (converted to float)
// set (set new value but no output)
// Argument (optional, defaults to 0):
// Initial stored value
// Output:
// float: Velocity as change per second (not ms)
#include "m_pd.h"
static char *version = "velocity v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
typedef struct velocity
{
t_object x_ob;
t_outlet *x_out;
t_float x_xn1; /* input (floats) */
t_float x_xn;
double x_lasttime;
} t_velocity;
static void velocity_bang(t_velocity *x)
{
double thistime;
t_float vel;
thistime = clock_getlogicaltime();
vel = (1000 * (x->x_xn - x->x_xn1) ) / (clock_gettimesince(x->x_lasttime));
x->x_lasttime = thistime;
outlet_float(x->x_out, vel);
}
static void velocity_float(t_velocity *x, t_floatarg f)
{
x->x_xn1 = x->x_xn;
x->x_xn = f;
velocity_bang(x);
}
static void velocity_free(t_velocity *x)
{
// nothing to do
}
static t_class *velocity_class;
static void *velocity_new(t_floatarg f)
{
t_velocity *x = (t_velocity *)pd_new(velocity_class);
x->x_out = outlet_new(&x->x_ob, gensym("float"));
x->x_lasttime = clock_getlogicaltime();
return (void *)x;
}
#ifndef MAXLIB
void velocity_setup(void)
{
velocity_class = class_new(gensym("velocity"), (t_newmethod)velocity_new,
(t_method)velocity_free, sizeof(t_velocity), 0, A_DEFFLOAT, 0);
#else
void maxlib_velocity_setup(void)
{
velocity_class = class_new(gensym("maxlib_velocity"), (t_newmethod)velocity_new,
(t_method)velocity_free, sizeof(t_velocity), 0, A_DEFFLOAT, 0);
class_addcreator((t_newmethod)velocity_new, gensym("velocity"), A_DEFFLOAT, 0);
#endif
class_addfloat(velocity_class, velocity_float);
class_addbang(velocity_class, velocity_bang);
#ifndef MAXLIB
post(version);
#else
class_sethelpsymbol(velocity_class, gensym("maxlib/velocity-help.pd"));
#endif
}
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