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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
+