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+/*************************************************************************** 
+ * File: pan~.c 
+ * Auth: Iain Mott [iain.mott@bigpond.com] 
+ * Maintainer: Iain Mott [iain.mott@bigpond.com] 
+ * Version: Part of motex_1.1.2 
+ * Date: January 2001
+ * 
+ * Description: Pd signal external. Equal-power stereo panning
+ * Angle input specified in degrees. -45 left, 0 centre, 45 right. 
+ * See supporting Pd patch: pan~.pd
+ * 
+ * Copyright (C) 2001 by Iain Mott [iain.mott@bigpond.com] 
+ * 
+ * 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, 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, which should be included with this 
+ * program, for more details. 
+ * 
+ ****************************************************************************/ 
+
+
+#include "m_pd.h"
+#include <math.h>
+
+static t_class *pan_class;
+#define RADCONST 0.017453293
+#define ROOT2DIV2 0.707106781
+
+typedef struct _pan
+{
+  t_object x_obj;
+  float x_f;
+  float pan;
+  float left;
+  float right;
+} t_pan;
+
+static void *pan_new(t_symbol *s, int argc, t_atom *argv)
+{
+  t_pan *x = (t_pan *)pd_new(pan_class);
+  outlet_new(&x->x_obj, gensym("signal"));
+  outlet_new(&x->x_obj, gensym("signal"));
+  inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("panf"));
+
+  x->x_f = 0;
+  x->left = ROOT2DIV2;
+  x->right = ROOT2DIV2;
+  return (x);
+}
+
+static t_int *pan_perform(t_int *w)
+{
+  float *in1 = (t_float *)(w[1]);
+  float *out1 = (t_float *)(w[2]);
+  float *out2 = (t_float *)(w[3]);
+  int n = (int)(w[4]);
+  t_pan *x = (t_pan *)(w[5]);
+  float value;
+  while  (n--) 
+    {
+      value = *in1++;
+      *out1++ = value * x->left;
+      *out2++ = value * x->right; 
+    }
+  return (w+6);
+}
+
+static void pan_dsp(t_pan *x, t_signal **sp)
+{
+  int n = sp[0]->s_n;
+  float *in1 = sp[0]->s_vec;
+  float *out1 = sp[1]->s_vec;
+  float *out2 = sp[2]->s_vec;
+
+  dsp_add(pan_perform, 5,
+	  in1, out1, out2, n, x);
+}
+
+void pan_f(t_pan *x, t_floatarg f)
+{
+  double angle;
+  f = f < -45 ? -45 : f;
+  f = f > 45 ? 45 : f;
+  angle = f * RADCONST; // convert degrees to radians
+  x->right  = ROOT2DIV2 * (cos(angle) + sin(angle));
+  x->left  = ROOT2DIV2 * (cos(angle) - sin(angle));
+/*    post("left = %f : right = %f", x->left, x->right); */
+}
+
+void pan_tilde_setup(void)
+{
+  pan_class = class_new(gensym("pan~"), (t_newmethod)pan_new, 0,
+			sizeof(t_pan), 0, A_GIMME, 0);
+  class_addmethod(pan_class, nullfn, gensym("signal"), 0);
+
+  class_addmethod(pan_class, (t_method)pan_dsp, gensym("dsp"), 0);
+  class_addmethod(pan_class, (t_method)pan_f, gensym("panf"), A_FLOAT, 0);  
+}