diff options
Diffstat (limited to 'rewrap.c')
| -rw-r--r-- | rewrap.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/rewrap.c b/rewrap.c new file mode 100644 index 0000000..e429dc0 --- /dev/null +++ b/rewrap.c @@ -0,0 +1,155 @@ +/* ------------------------- rewrap ------------------------------------------ */
+/* */
+/* rewraps input to lie within an output range. */
+/* 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>
+#include <math.h>
+
+static char *version = "rewrap v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
+
+typedef struct rewrap
+{
+ t_object x_ob;
+ t_float x_min; /* low border of input range */
+ t_float x_max; /* high border of input range */
+ t_outlet *x_outlet1; /* path-through outlet */
+ t_outlet *x_outlet2; /* rewrap outlet */
+} t_rewrap;
+
+static void rewrap_float(t_rewrap *x, t_floatarg f)
+{
+ t_float min = x->x_min;
+ t_float max = x->x_max;
+ t_float range = 2.0f * (max - min);
+ t_int i;
+
+ if(range == 0.0f)
+ {
+ f = min;
+ outlet_float(x->x_outlet2, 0);
+ }
+ else if(f < min)
+ {
+ float diff = min - f;
+ float n = ceil(diff / range);
+
+ f += n * range;
+
+ if(f >= max)
+ {
+ f = 2 * max - f;
+ n -= 0.5;
+ }
+
+ outlet_float(x->x_outlet2, (t_int)(-2.0f * n));
+ }
+ else if (f >= max)
+ {
+ float diff = f - max;
+ float n = floor(diff / range) + 1.0f;
+
+ f -= n * range;
+
+ if(f < min)
+ {
+ f = 2 * min - f;
+ n -= 0.5;
+ }
+
+ outlet_float(x->x_outlet2, (t_int)(2.0f * n));
+ }
+ else
+ outlet_float(x->x_outlet2, 0.0f);
+
+
+ outlet_float(x->x_outlet1, f);
+}
+
+static void rewrap_a(t_rewrap *x, t_floatarg a)
+{
+ t_float max = x->x_max;
+
+ if(a <= max)
+ x->x_min = a;
+ else
+ {
+ x->x_min = max;
+ x->x_max = a;
+ }
+}
+
+static void rewrap_b(t_rewrap *x, t_floatarg b)
+{
+ t_float min = x->x_min;
+
+ if(b >= min)
+ x->x_max = b;
+ else
+ {
+ x->x_max = min;
+ x->x_min = b;
+ }
+}
+
+static t_class *rewrap_class;
+
+static void *rewrap_new(t_floatarg fmin, t_floatarg fmax)
+{
+ t_rewrap *x = (t_rewrap *)pd_new(rewrap_class);
+
+ inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("a"));
+ inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("b"));
+
+ x->x_outlet1 = outlet_new(&x->x_ob, gensym("float"));
+ x->x_outlet2 = outlet_new(&x->x_ob, gensym("float"));
+
+ x->x_min = fmin;
+ rewrap_b(x, fmax);
+
+ return (void *)x;
+}
+
+#ifndef MAXLIB
+void rewrap_setup(void)
+{
+ rewrap_class = class_new(gensym("rewrap"), (t_newmethod)rewrap_new,
+ 0, sizeof(t_rewrap), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addfloat(rewrap_class, rewrap_float);
+ class_addmethod(rewrap_class, (t_method)rewrap_a, gensym("a"), A_FLOAT, 0);
+ class_addmethod(rewrap_class, (t_method)rewrap_b, gensym("b"), A_FLOAT, 0);
+
+ post(version);
+}
+#else
+void maxlib_rewrap_setup(void)
+{
+ rewrap_class = class_new(gensym("maxlib_rewrap"), (t_newmethod)rewrap_new,
+ 0, sizeof(t_rewrap), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addcreator((t_newmethod)rewrap_new, gensym("rewrap"), A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addfloat(rewrap_class, rewrap_float);
+ class_addmethod(rewrap_class, (t_method)rewrap_a, gensym("a"), A_FLOAT, 0);
+ class_addmethod(rewrap_class, (t_method)rewrap_b, gensym("b"), A_FLOAT, 0);
+ class_sethelpsymbol(rewrap_class, gensym("maxlib/rewrap-help.pd"));
+}
+#endif
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