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+/* -------------------------- step ------------------------------------------ */
+/* */
+/* Step to a new value in N milliseconds (similar to line). */
+/* 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"
+
+/* -------------------------- step ------------------------------ */
+static char *version = "step v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
+
+static t_class *step_class;
+
+typedef struct _step
+{
+ t_object x_obj;
+ t_clock *x_clock;
+ double x_targettime;
+ t_float x_targetval;
+ double x_prevtime;
+ t_float x_setval;
+ int x_gotinlet;
+ t_float x_grain; /* time interval for output */
+ t_float x_step; /* step size for output */
+ t_float x_steptime; /* length for one step */
+ t_int x_stepcall;
+ double x_1overtimediff;
+ double x_in1val;
+} t_step;
+
+static void step_tick(t_step *x)
+{
+ t_float outvalue;
+ double timenow = clock_getsystime();
+ double msectogo = - clock_gettimesince(x->x_targettime);
+ if (msectogo < 1E-9)
+ {
+ outlet_float(x->x_obj.ob_outlet, x->x_targetval);
+ }
+ else
+ {
+ if(x->x_setval < x->x_targetval)
+ { /* count upwards */
+ outvalue = x->x_setval + x->x_stepcall * x->x_step;
+ }
+ else
+ { /* count downwards */
+ outvalue = x->x_setval - x->x_stepcall * x->x_step;
+ }
+ outlet_float(x->x_obj.ob_outlet, outvalue);
+ clock_delay(x->x_clock, (x->x_steptime > msectogo ? msectogo : x->x_steptime));
+ }
+ x->x_stepcall++;
+}
+
+static void step_float(t_step *x, t_float f)
+{
+ double timenow = clock_getsystime();
+ if (x->x_gotinlet && x->x_in1val > 0 && x->x_step != 0 && f != x->x_setval)
+ {
+ if (timenow > x->x_targettime) x->x_setval = x->x_targetval;
+ else x->x_setval = x->x_setval + x->x_1overtimediff *
+ (timenow - x->x_prevtime)
+ * (x->x_targetval - x->x_setval);
+ x->x_prevtime = timenow;
+ x->x_targetval = f; /* where to end */
+ x->x_stepcall = 0;
+ /* how long does it take ? */
+ x->x_targettime = clock_getsystimeafter(x->x_in1val);
+ if(x->x_setval < x->x_targetval)
+ {
+ x->x_steptime = x->x_in1val / (int)((x->x_targetval - x->x_setval) / x->x_step);
+ }
+ else
+ {
+ x->x_steptime = x->x_in1val / (int)((x->x_setval - x->x_targetval) / x->x_step);
+ }
+ // post("steptime %g", x->x_steptime);
+ step_tick(x);
+ x->x_gotinlet = 0;
+ x->x_1overtimediff = 1./ (x->x_targettime - timenow);
+ /* call tick function */
+ clock_delay(x->x_clock, x->x_steptime);
+
+ }
+ else
+ {
+ clock_unset(x->x_clock);
+ x->x_targetval = x->x_setval = f;
+ outlet_float(x->x_obj.ob_outlet, f);
+ }
+ x->x_gotinlet = 0;
+}
+
+static void step_ft1(t_step *x, t_floatarg g)
+{
+ x->x_in1val = g;
+ x->x_gotinlet = 1;
+}
+
+static void step_ft2(t_step *x, t_floatarg g)
+{
+ if (g <= 0) g = 1;
+ x->x_step = g;
+ x->x_gotinlet = 1;
+}
+
+static void step_stop(t_step *x)
+{
+ x->x_targetval = x->x_setval;
+ clock_unset(x->x_clock);
+}
+
+static void step_free(t_step *x)
+{
+ clock_free(x->x_clock);
+}
+
+static void *step_new(t_floatarg f, t_floatarg step, t_floatarg grain)
+{
+ t_step *x = (t_step *)pd_new(step_class);
+ x->x_targetval = x->x_setval = f;
+ x->x_gotinlet = 0;
+ x->x_1overtimediff = 1;
+ x->x_clock = clock_new(x, (t_method)step_tick);
+ x->x_targettime = x->x_prevtime = clock_getsystime();
+ if (grain <= 0) grain = 20;
+ x->x_grain = grain;
+ if (step <= 0) step = 1;
+ x->x_step = step;
+ outlet_new(&x->x_obj, gensym("float"));
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft1"));
+ inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("ft2"));
+ return (x);
+}
+
+#ifndef MAXLIB
+void step_setup(void)
+{
+ step_class = class_new(gensym("step"), (t_newmethod)step_new,
+ (t_method)step_free, sizeof(t_step), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addmethod(step_class, (t_method)step_ft1, gensym("ft1"), A_FLOAT, 0);
+ class_addmethod(step_class, (t_method)step_ft2, gensym("ft2"), A_FLOAT, 0);
+ class_addmethod(step_class, (t_method)step_stop, gensym("stop"), 0);
+ class_addfloat(step_class, (t_method)step_float);
+
+ post(version);
+}
+#else
+void maxlib_step_setup(void)
+{
+ step_class = class_new(gensym("maxlib_step"), (t_newmethod)step_new,
+ (t_method)step_free, sizeof(t_step), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addcreator((t_newmethod)step_new, gensym("step"), A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addmethod(step_class, (t_method)step_ft1, gensym("ft1"), A_FLOAT, 0);
+ class_addmethod(step_class, (t_method)step_ft2, gensym("ft2"), A_FLOAT, 0);
+ class_addmethod(step_class, (t_method)step_stop, gensym("stop"), 0);
+ class_addfloat(step_class, (t_method)step_float);
+ class_sethelpsymbol(step_class, gensym("maxlib/step-help.pd"));
+}
+#endif