aboutsummaryrefslogtreecommitdiff
path: root/base.c
diff options
context:
space:
mode:
Diffstat (limited to 'base.c')
-rw-r--r--base.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/base.c b/base.c
new file mode 100644
index 0000000..ffdcb9f
--- /dev/null
+++ b/base.c
@@ -0,0 +1,269 @@
+/* base Attractor PD External */
+/* Copyright Michael McGonagle, 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 0
+#define M_a_hi 3
+#define M_b_lo 0.001
+#define M_b_hi 2.6667
+
+#define M_a 0
+#define M_b 1
+
+#define M_x 0
+
+#define M_param_count 2
+#define M_var_count 1
+#define M_search_count 3
+#define M_failure_limit 1000
+
+static char *version = "base v0.0, by Michael McGonagle, 2003";
+
+t_class *base_class;
+
+typedef struct base_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;
+ t_atom params_out[M_param_count];
+ t_outlet *params_outlet;
+ double lyap_exp, lyap_lo, lyap_hi, lyap_limit, failure_ratio;
+} base_struct;
+
+static void calc(base_struct *base, double *vars) {
+ double x_0;
+ x_0 =vars[M_x]+(base -> a*sin(pow(vars[M_x],base -> b)));
+ vars[M_x] = x_0;
+} // end calc
+
+static void calculate(base_struct *base) {
+ calc(base, base -> vars);
+ outlet_float(base -> x_obj.ob_outlet, base -> vars[M_x]);
+} // end calculate
+
+static void reset(base_struct *base, t_symbol *s, int argc, t_atom *argv) {
+ if (argc == M_var_count) {
+ base -> vars[M_x] = (double) atom_getfloatarg(M_x, argc, argv);
+ } else {
+ base -> vars[M_x] = base -> vars_init[M_x];
+ } // end if
+} // end reset
+
+static char *classify(base_struct *base) {
+ static char buff[3];
+ char *c = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+ buff[0] = c[(int) (((base -> a - M_a_lo) * (1.0 / (M_a_hi - M_a_lo))) * 26)];
+ buff[1] = c[(int) (((base -> b - M_b_lo) * (1.0 / (M_b_hi - M_b_lo))) * 26)];
+ buff[2] = '\0';
+ return buff;
+}
+
+static void make_results(base_struct *base) {
+ SETFLOAT(&base -> search_out[0], base -> lyap_exp);
+ SETSYMBOL(&base -> search_out[1], gensym(classify(base)));
+ SETFLOAT(&base -> search_out[2], base -> failure_ratio);
+ SETFLOAT(&base -> vars_out[M_x], base -> vars[M_x]);
+ SETFLOAT(&base -> params_out[M_a], base -> a);
+ SETFLOAT(&base -> params_out[M_b], base -> b);
+ outlet_list(base -> params_outlet, gensym("list"), M_param_count, base -> params_out);
+ outlet_list(base -> vars_outlet, gensym("list"), M_var_count, base -> vars_out);
+}
+
+static void show(base_struct *base) {
+ make_results(base);
+ outlet_anything(base -> search_outlet, gensym("show"), M_search_count, base -> search_out);
+}
+
+static void param(base_struct *base, t_symbol *s, int argc, t_atom *argv) {
+ if (argc != 2) {
+ post("Incorrect number of arguments for base fractal. Expecting 2 arguments.");
+ return;
+ }
+ base -> a = (double) atom_getfloatarg(0, argc, argv);
+ base -> b = (double) atom_getfloatarg(1, argc, argv);
+}
+
+static void seed(base_struct *base, 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(base_struct *base, t_floatarg l, t_floatarg h, t_floatarg lim) {
+ base -> lyap_lo = l;
+ base -> lyap_hi = h;
+ base -> lyap_limit = (double) ((int) lim);
+}
+
+static void elyap(base_struct *base) {
+ double results[M_var_count];
+ int i;
+ if (lyapunov_full((void *) base, (t_gotfn) calc, M_var_count, base -> vars, results) != NULL) {
+ post("elyapunov:");
+ for(i = 0; i < M_var_count; i++) { post("%d: %3.80f", i, results[i]); }
+ }
+}
+
+static void limiter(base_struct *base) {
+ if (base -> a_lo < M_a_lo) { base -> a_lo = M_a_lo; }
+ if (base -> a_lo > M_a_hi) { base -> a_lo = M_a_hi; }
+ if (base -> a_hi < M_a_lo) { base -> a_hi = M_a_lo; }
+ if (base -> a_hi > M_a_hi) { base -> a_hi = M_a_hi; }
+ if (base -> b_lo < M_b_lo) { base -> b_lo = M_b_lo; }
+ if (base -> b_lo > M_b_hi) { base -> b_lo = M_b_hi; }
+ if (base -> b_hi < M_b_lo) { base -> b_hi = M_b_lo; }
+ if (base -> b_hi > M_b_hi) { base -> b_hi = M_b_hi; }
+}
+
+static void constrain(base_struct *base, t_symbol *s, int argc, t_atom *argv) {
+ int i;
+ t_atom *arg = argv;
+ if (argc == 0) {
+ // reset to full limits of search ranges
+ base -> a_lo = M_a_lo;
+ base -> a_hi = M_a_hi;
+ base -> b_lo = M_b_lo;
+ base -> b_hi = M_b_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;
+ base -> a_lo = base -> a - a_spread;
+ base -> a_hi = base -> a + a_spread;
+ base -> b_lo = base -> b - b_spread;
+ base -> b_hi = base -> b + b_spread;
+ limiter(base);
+ return;
+ }
+ if (argc != M_param_count * 2) {
+ post("Invalid number of arguments for base constraints, requires 4 values, got %d", argc);
+ return;
+ }
+ base -> a_lo = atom_getfloat(arg++);
+ base -> a_hi = atom_getfloat(arg++);
+ base -> b_lo = atom_getfloat(arg++);
+ base -> b_hi = atom_getfloat(arg++);
+ limiter(base);
+}
+
+static void search(base_struct *base, t_symbol *s, int argc, t_atom *argv) {
+ int not_found, not_expired = base -> lyap_limit;
+ int jump, i, iterations;
+ t_atom vars[M_var_count];
+ double temp_a = base -> a;
+ double temp_b = base -> b;
+ 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], base -> vars_init[i]);
+ }
+ }
+ do {
+ jump = 500;
+ not_found = 0;
+ iterations = 10000;
+ bad_params:
+ base -> a = (drand48() * (base -> a_hi - base -> a_lo)) + base -> a_lo;
+ base -> b = (drand48() * (base -> b_hi - base -> b_lo)) + base -> b_lo;
+ // put any preliminary checks specific to this fractal to eliminate bad_params
+
+ reset(base, NULL, argc, vars);
+ do { calc(base, base -> vars); } while(jump--);
+ base -> lyap_exp = lyapunov((void *) base, (t_gotfn) calc, M_var_count, (double *) base -> vars);
+ if (isnan(base -> lyap_exp)) { not_found = 1; }
+ if (base -> lyap_exp < base -> lyap_lo || base -> lyap_exp > base -> lyap_hi) { not_found = 1; }
+ not_expired--;
+ } while(not_found && not_expired);
+ reset(base, NULL, argc, vars);
+ if (!not_expired) {
+ post("Could not find a fractal after %d attempts.", (int) base -> lyap_limit);
+ post("Try using wider constraints.");
+ base -> a = temp_a;
+ base -> b = temp_b;
+ outlet_anything(base -> search_outlet, gensym("invalid"), 0, NULL);
+ } else {
+ base -> failure_ratio = (base -> lyap_limit - not_expired) / base -> lyap_limit;
+ make_results(base);
+ outlet_anything(base -> search_outlet, gensym("search"), M_search_count, base -> search_out);
+ }
+}
+
+void *base_new(t_symbol *s, int argc, t_atom *argv) {
+ base_struct *base = (base_struct *) pd_new(base_class);
+ if (base != NULL) {
+ outlet_new(&base -> x_obj, &s_float);
+ base -> search_outlet = outlet_new(&base -> x_obj, &s_list);
+ base -> vars_outlet = outlet_new(&base -> x_obj, &s_list);
+ base -> params_outlet = outlet_new(&base -> x_obj, &s_list);
+ if (argc == M_param_count + M_var_count) {
+ base -> vars_init[M_x] = base -> vars[M_x] = (double) atom_getfloatarg(0, argc, argv);
+ base -> a = (double) atom_getfloatarg(1, argc, argv);
+ base -> b = (double) atom_getfloatarg(2, argc, argv);
+ } else {
+ if (argc != 0 && argc != M_param_count + M_var_count) {
+ post("Incorrect number of arguments for base fractal. Expecting 3 arguments.");
+ }
+ base -> vars_init[M_x] = 0.1;
+ base -> a = 1;
+ base -> b = 1;
+ }
+ constrain(base, NULL, 0, NULL);
+ lyap(base, -1000000.0, 1000000.0, M_failure_limit);
+ }
+ return (void *)base;
+}
+
+void base_setup(void) {
+ base_class = class_new(gensym("base"), (t_newmethod) base_new, 0, sizeof(base_struct), 0, A_GIMME, 0);
+ class_addbang(base_class, (t_method) calculate);
+ class_addmethod(base_class, (t_method) reset, gensym("reset"), A_GIMME, 0);
+ class_addmethod(base_class, (t_method) show, gensym("show"), 0);
+ class_addmethod(base_class, (t_method) param, gensym("param"), A_GIMME, 0);
+ class_addmethod(base_class, (t_method) seed, gensym("seed"), A_GIMME, 0);
+ class_addmethod(base_class, (t_method) lyap, gensym("lyapunov"), A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
+ class_addmethod(base_class, (t_method) elyap, gensym("elyapunov"), 0);
+ class_addmethod(base_class, (t_method) search, gensym("search"), A_GIMME, 0);
+ class_addmethod(base_class, (t_method) constrain, gensym("constrain"), A_GIMME, 0);
+ class_sethelpsymbol(base_class, gensym("help-base.pd"));
+}
+