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Diffstat (limited to 'hopalong.c')
| -rw-r--r-- | hopalong.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/hopalong.c b/hopalong.c new file mode 100644 index 0000000..01f6d13 --- /dev/null +++ b/hopalong.c @@ -0,0 +1,303 @@ +/* hopalong Attractor PD External */ +/* Copyright Michael McGonagle, from ??????, 2003 */ +/* This program is distributed under the params of the GNU Public License */ + +/////////////////////////////////////////////////////////////////////////////////// +/* This file is part of Chaos PD Externals. */ +/* */ +/* Chaos PD Externals are free software; you can redistribute them and/or modify */ +/* them 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. */ +/* */ +/* Chaos PD Externals are distributed in the hope that they 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 the Chaos PD Externals; if not, write to the Free Software */ +/* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +/////////////////////////////////////////////////////////////////////////////////// + +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <time.h> +#include "lyapunov.h" + +#define M_a_lo -1000 +#define M_a_hi 1000 +#define M_b_lo -1000 +#define M_b_hi 1000 +#define M_c_lo -1000 +#define M_c_hi 1000 + +#define M_a 0 +#define M_b 1 +#define M_c 2 + +#define M_x 0 +#define M_y 1 + +#define M_param_count 3 +#define M_var_count 2 +#define M_search_count 3 +#define M_failure_limit 1000 + +static char *version = "hopalong v0.0, by Michael McGonagle, from ??????, 2003"; + +t_class *hopalong_class; + +typedef struct hopalong_struct { + t_object x_obj; + + double vars[M_var_count]; + double vars_init[M_var_count]; + t_atom vars_out[M_var_count]; + t_outlet *vars_outlet; + + t_atom search_out[M_search_count]; + t_outlet *search_outlet; + + double a, a_lo, a_hi, b, b_lo, b_hi, c, c_lo, c_hi; + t_atom params_out[M_param_count]; + t_outlet *params_outlet; + double lyap_exp, lyap_lo, lyap_hi, lyap_limit, failure_ratio; + + t_outlet *outlets[M_var_count - 1]; +} hopalong_struct; + +static void calc(hopalong_struct *hopalong, double *vars) { + double x_0, y_0; + x_0 =vars[M_y]-((vars[M_x]<0)?-1:1)*sqrt(abs(hopalong -> b*vars[M_x]-hopalong -> c)); + y_0 =hopalong -> a-vars[M_x]; + vars[M_x] = x_0; + vars[M_y] = y_0; +} // end calc + +static void calculate(hopalong_struct *hopalong) { + calc(hopalong, hopalong -> vars); + outlet_float(hopalong -> x_obj.ob_outlet, hopalong -> vars[M_x]); + outlet_float(hopalong -> outlets[M_y - 1], hopalong -> vars[M_y]); +} // end calculate + +static void reset(hopalong_struct *hopalong, t_symbol *s, int argc, t_atom *argv) { + if (argc == M_var_count) { + hopalong -> vars[M_x] = (double) atom_getfloatarg(M_x, argc, argv); + hopalong -> vars[M_y] = (double) atom_getfloatarg(M_y, argc, argv); + } else { + hopalong -> vars[M_x] = hopalong -> vars_init[M_x]; + hopalong -> vars[M_y] = hopalong -> vars_init[M_y]; + } // end if +} // end reset + +static char *classify(hopalong_struct *hopalong) { + static char buff[4]; + char *c = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; + buff[0] = c[(int) (((hopalong -> a - M_a_lo) * (1.0 / (M_a_hi - M_a_lo))) * 26)]; + buff[1] = c[(int) (((hopalong -> b - M_b_lo) * (1.0 / (M_b_hi - M_b_lo))) * 26)]; + buff[2] = c[(int) (((hopalong -> c - M_c_lo) * (1.0 / (M_c_hi - M_c_lo))) * 26)]; + buff[3] = '\0'; + return buff; +} + +static void make_results(hopalong_struct *hopalong) { + SETFLOAT(&hopalong -> search_out[0], hopalong -> lyap_exp); + SETSYMBOL(&hopalong -> search_out[1], gensym(classify(hopalong))); + SETFLOAT(&hopalong -> search_out[2], hopalong -> failure_ratio); + SETFLOAT(&hopalong -> vars_out[M_x], hopalong -> vars[M_x]); + SETFLOAT(&hopalong -> vars_out[M_y], hopalong -> vars[M_y]); + SETFLOAT(&hopalong -> params_out[M_a], hopalong -> a); + SETFLOAT(&hopalong -> params_out[M_b], hopalong -> b); + SETFLOAT(&hopalong -> params_out[M_c], hopalong -> c); + outlet_list(hopalong -> params_outlet, gensym("list"), M_param_count, hopalong -> params_out); + outlet_list(hopalong -> vars_outlet, gensym("list"), M_var_count, hopalong -> vars_out); +} + +static void show(hopalong_struct *hopalong) { + make_results(hopalong); + outlet_anything(hopalong -> search_outlet, gensym("show"), M_search_count, hopalong -> search_out); +} + +static void param(hopalong_struct *hopalong, t_symbol *s, int argc, t_atom *argv) { + if (argc != 3) { + post("Incorrect number of arguments for hopalong fractal. Expecting 3 arguments."); + return; + } + hopalong -> a = (double) atom_getfloatarg(0, argc, argv); + hopalong -> b = (double) atom_getfloatarg(1, argc, argv); + hopalong -> c = (double) atom_getfloatarg(2, argc, argv); +} + +static void seed(hopalong_struct *hopalong, t_symbol *s, int argc, t_atom *argv) { + if (argc > 0) { + srand48(((unsigned int)time(0))|1); + } else { + srand48((unsigned int) atom_getfloatarg(0, argc, argv)); + } +} + +static void lyap(hopalong_struct *hopalong, t_floatarg l, t_floatarg h, t_floatarg lim) { + hopalong -> lyap_lo = l; + hopalong -> lyap_hi = h; + hopalong -> lyap_limit = (double) ((int) lim); +} + +static void elyap(hopalong_struct *hopalong) { + double results[M_var_count]; + int i; + if (lyapunov_full((void *) hopalong, (t_gotfn) calc, M_var_count, hopalong -> vars, results) != NULL) { + post("elyapunov:"); + for(i = 0; i < M_var_count; i++) { post("%d: %3.80f", i, results[i]); } + } +} + +static void limiter(hopalong_struct *hopalong) { + if (hopalong -> a_lo < M_a_lo) { hopalong -> a_lo = M_a_lo; } + if (hopalong -> a_lo > M_a_hi) { hopalong -> a_lo = M_a_hi; } + if (hopalong -> a_hi < M_a_lo) { hopalong -> a_hi = M_a_lo; } + if (hopalong -> a_hi > M_a_hi) { hopalong -> a_hi = M_a_hi; } + if (hopalong -> b_lo < M_b_lo) { hopalong -> b_lo = M_b_lo; } + if (hopalong -> b_lo > M_b_hi) { hopalong -> b_lo = M_b_hi; } + if (hopalong -> b_hi < M_b_lo) { hopalong -> b_hi = M_b_lo; } + if (hopalong -> b_hi > M_b_hi) { hopalong -> b_hi = M_b_hi; } + if (hopalong -> c_lo < M_c_lo) { hopalong -> c_lo = M_c_lo; } + if (hopalong -> c_lo > M_c_hi) { hopalong -> c_lo = M_c_hi; } + if (hopalong -> c_hi < M_c_lo) { hopalong -> c_hi = M_c_lo; } + if (hopalong -> c_hi > M_c_hi) { hopalong -> c_hi = M_c_hi; } +} + +static void constrain(hopalong_struct *hopalong, t_symbol *s, int argc, t_atom *argv) { + int i; + t_atom *arg = argv; + if (argc == 0) { + // reset to full limits of search ranges + hopalong -> a_lo = M_a_lo; + hopalong -> a_hi = M_a_hi; + hopalong -> b_lo = M_b_lo; + hopalong -> b_hi = M_b_hi; + hopalong -> c_lo = M_c_lo; + hopalong -> c_hi = M_c_hi; + return; + } + if (argc == 1) { + // set the ranges based on percentage of full range + double percent = atom_getfloat(arg); + double a_spread = ((M_a_hi - M_a_lo) * percent) / 2; + double b_spread = ((M_b_hi - M_b_lo) * percent) / 2; + double c_spread = ((M_c_hi - M_c_lo) * percent) / 2; + hopalong -> a_lo = hopalong -> a - a_spread; + hopalong -> a_hi = hopalong -> a + a_spread; + hopalong -> b_lo = hopalong -> b - b_spread; + hopalong -> b_hi = hopalong -> b + b_spread; + hopalong -> c_lo = hopalong -> c - c_spread; + hopalong -> c_hi = hopalong -> c + c_spread; + limiter(hopalong); + return; + } + if (argc != M_param_count * 2) { + post("Invalid number of arguments for hopalong constraints, requires 6 values, got %d", argc); + return; + } + hopalong -> a_lo = atom_getfloat(arg++); + hopalong -> a_hi = atom_getfloat(arg++); + hopalong -> b_lo = atom_getfloat(arg++); + hopalong -> b_hi = atom_getfloat(arg++); + hopalong -> c_lo = atom_getfloat(arg++); + hopalong -> c_hi = atom_getfloat(arg++); + limiter(hopalong); +} + +static void search(hopalong_struct *hopalong, t_symbol *s, int argc, t_atom *argv) { + int not_found, not_expired = hopalong -> lyap_limit; + int jump, i, iterations; + t_atom vars[M_var_count]; + double temp_a = hopalong -> a; + double temp_b = hopalong -> b; + double temp_c = hopalong -> c; + if (argc > 0) { + for (i = 0; i < M_var_count; i++) { + SETFLOAT(&vars[i], atom_getfloatarg(i, argc, argv)); + } + } else { + for (i = 0; i < M_var_count; i++) { + SETFLOAT(&vars[i], hopalong -> vars_init[i]); + } + } + do { + jump = 500; + not_found = 0; + iterations = 10000; + bad_params: + hopalong -> a = (drand48() * (hopalong -> a_hi - hopalong -> a_lo)) + hopalong -> a_lo; + hopalong -> b = (drand48() * (hopalong -> b_hi - hopalong -> b_lo)) + hopalong -> b_lo; + hopalong -> c = (drand48() * (hopalong -> c_hi - hopalong -> c_lo)) + hopalong -> c_lo; + // put any preliminary checks specific to this fractal to eliminate bad_params + + reset(hopalong, NULL, argc, vars); + do { calc(hopalong, hopalong -> vars); } while(jump--); + hopalong -> lyap_exp = lyapunov((void *) hopalong, (t_gotfn) calc, M_var_count, (double *) hopalong -> vars); + if (isnan(hopalong -> lyap_exp)) { not_found = 1; } + if (hopalong -> lyap_exp < hopalong -> lyap_lo || hopalong -> lyap_exp > hopalong -> lyap_hi) { not_found = 1; } + not_expired--; + } while(not_found && not_expired); + reset(hopalong, NULL, argc, vars); + if (!not_expired) { + post("Could not find a fractal after %d attempts.", (int) hopalong -> lyap_limit); + post("Try using wider constraints."); + hopalong -> a = temp_a; + hopalong -> b = temp_b; + hopalong -> c = temp_c; + outlet_anything(hopalong -> search_outlet, gensym("invalid"), 0, NULL); + } else { + hopalong -> failure_ratio = (hopalong -> lyap_limit - not_expired) / hopalong -> lyap_limit; + make_results(hopalong); + outlet_anything(hopalong -> search_outlet, gensym("search"), M_search_count, hopalong -> search_out); + } +} + +void *hopalong_new(t_symbol *s, int argc, t_atom *argv) { + hopalong_struct *hopalong = (hopalong_struct *) pd_new(hopalong_class); + if (hopalong != NULL) { + outlet_new(&hopalong -> x_obj, &s_float); + hopalong -> outlets[0] = outlet_new(&hopalong -> x_obj, &s_float); + hopalong -> search_outlet = outlet_new(&hopalong -> x_obj, &s_list); + hopalong -> vars_outlet = outlet_new(&hopalong -> x_obj, &s_list); + hopalong -> params_outlet = outlet_new(&hopalong -> x_obj, &s_list); + if (argc == M_param_count + M_var_count) { + hopalong -> vars_init[M_x] = hopalong -> vars[M_x] = (double) atom_getfloatarg(0, argc, argv); + hopalong -> vars_init[M_y] = hopalong -> vars[M_y] = (double) atom_getfloatarg(1, argc, argv); + hopalong -> a = (double) atom_getfloatarg(2, argc, argv); + hopalong -> b = (double) atom_getfloatarg(3, argc, argv); + hopalong -> c = (double) atom_getfloatarg(4, argc, argv); + } else { + if (argc != 0 && argc != M_param_count + M_var_count) { + post("Incorrect number of arguments for hopalong fractal. Expecting 5 arguments."); + } + hopalong -> vars_init[M_x] = 0.1; + hopalong -> vars_init[M_y] = 0.1; + hopalong -> a = 1; + hopalong -> b = 1; + hopalong -> c = 0; + } + constrain(hopalong, NULL, 0, NULL); + lyap(hopalong, -1000000.0, 1000000.0, M_failure_limit); + } + return (void *)hopalong; +} + +void hopalong_setup(void) { + hopalong_class = class_new(gensym("hopalong"), (t_newmethod) hopalong_new, 0, sizeof(hopalong_struct), 0, A_GIMME, 0); + class_addbang(hopalong_class, (t_method) calculate); + class_addmethod(hopalong_class, (t_method) reset, gensym("reset"), A_GIMME, 0); + class_addmethod(hopalong_class, (t_method) show, gensym("show"), 0); + class_addmethod(hopalong_class, (t_method) param, gensym("param"), A_GIMME, 0); + class_addmethod(hopalong_class, (t_method) seed, gensym("seed"), A_GIMME, 0); + class_addmethod(hopalong_class, (t_method) lyap, gensym("lyapunov"), A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0); + class_addmethod(hopalong_class, (t_method) elyap, gensym("elyapunov"), 0); + class_addmethod(hopalong_class, (t_method) search, gensym("search"), A_GIMME, 0); + class_addmethod(hopalong_class, (t_method) constrain, gensym("constrain"), A_GIMME, 0); + class_sethelpsymbol(hopalong_class, gensym("help-hopalong.pd")); +} + |