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/* --------------------------- edge ----------------------------------------- */
/* */
/* Detect rising or falling edge of float input. */
/* 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>
static char *version = "edge v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
typedef struct edge
{
t_object x_ob;
t_outlet *x_out1; /* bang on rising edge */
t_outlet *x_out2; /* bang on falling edge */
t_float x_lastval; /* last input value */
} t_edge;
static void edge_float(t_edge *x, t_floatarg f)
{
if((x->x_lastval <= 0) && (f >= 1)) /* rising edge */
outlet_bang(x->x_out1);
else if((x->x_lastval >= 1) && (f <= 0)) /* falling edge */
outlet_bang(x->x_out2);
x->x_lastval = f; /* save last value */
}
static t_class *edge_class;
static void *edge_new(t_floatarg f)
{
int i;
t_edge *x = (t_edge *)pd_new(edge_class);
x->x_out1 = outlet_new(&x->x_ob, gensym("bang"));
x->x_out2 = outlet_new(&x->x_ob, gensym("bang"));
x->x_lastval = f;
return (void *)x;
}
#ifndef MAXLIB
void edge_setup(void)
{
edge_class = class_new(gensym("edge"), (t_newmethod)edge_new,
0, sizeof(t_edge), 0, A_DEFFLOAT, 0);
class_addfloat(edge_class, edge_float);
post(version);
}
#else
void maxlib_edge_setup(void)
{
edge_class = class_new(gensym("maxlib_edge"), (t_newmethod)edge_new,
0, sizeof(t_edge), 0, A_DEFFLOAT, 0);
class_addfloat(edge_class, edge_float);
class_addcreator((t_newmethod)edge_new, gensym("edge"), A_DEFFLOAT, 0);
class_sethelpsymbol(edge_class, gensym("maxlib/edge-help.pd"));
}
#endif
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