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-rw-r--r--src/velocity.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/src/velocity.c b/src/velocity.c
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+++ b/src/velocity.c
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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"));
+#ifndef MAXLIB
+ post(version);
+#endif
+ x->x_lasttime = clock_getlogicaltime();
+
+ return (void *)x;
+}
+
+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);
+ class_addfloat(velocity_class, velocity_float);
+ class_addbang(velocity_class, velocity_bang);
+ class_sethelpsymbol(velocity_class, gensym("maxlib/help-velocity.pd"));
+}
+