/* -------------------------- 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 "; 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); logpost(NULL, 4, 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