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/***************************************************************************
* File: shuffle.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 control external. a no-repeat random generator.
* Outputs numbers within a set range
* See supporting Pd patch: shuffle.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.
*
****************************************************************************/
/* code for shuffle pd class */
#include "m_pd.h"
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <limits.h>
typedef struct shuffle
{
t_object t_ob;
float begin;
float end;
int size; /* size of pshuffle */
int size_ptemp;
float fraction; /* fractional size of ptemp */
int *pshuffle;
int *ptemp;
int index;
} t_shuffle;
int itemPresent (t_shuffle *x, int test)
{
int flag = 0;
int temp_flag = 0;
int i;
for (i = 0; i < x->size; i++)
{
if (test == x->pshuffle[i])
temp_flag = 1;
flag = flag || temp_flag;
}
return flag;
}
void fillWithMin (t_shuffle *x)
{
int i;
for (i = 0; i < x->size; i++)
{
x->pshuffle[i] = INT_MIN;
}
}
void srubLastFraction (t_shuffle *x)
{
int i;
for (i = 0; i < x->size_ptemp; i++)
x->pshuffle[x->size - 1 - i] = INT_MIN;
}
void shuffleDeck (t_shuffle *x)
{
double scaled_rand;
int answer;
int i = 0;
int done = 0;
while (i < x->size)
{
if (i >= x->size_ptemp && !done)
{
srubLastFraction(x);
done = 1;
}
scaled_rand = rand () / (float) RAND_MAX ;
scaled_rand *= (x->end - x->begin);
answer = (int) (scaled_rand + 0.5) + (int) x->begin;
if (!itemPresent (x, answer))
{
x->pshuffle[i] = answer;
i++;
}
}
}
void shuffle_float(t_shuffle *x, t_floatarg f)
{
x->begin = f;
if (x->end < x->begin)
{
float tmp = x->begin;
x->begin = x->end;
x->end = tmp;
}
x->size = (int) x->end - (int) x->begin + 1;
x->index = 0;
free(x->pshuffle);
free(x->ptemp);
x->pshuffle = malloc ( x->size * sizeof(int));
x->size_ptemp = (int) (x->fraction * x->size);
x->ptemp = malloc( x->size_ptemp * sizeof(int));
fillWithMin (x);
shuffleDeck(x);
}
void shuffle_ft1(t_shuffle *x, t_floatarg g)
{
x->end = g;
}
void shuffle_free(t_shuffle *x)
{
free(x->pshuffle);
free(x->ptemp);
}
t_class *shuffle_class;
void shuffle_ft2(t_shuffle *x, t_floatarg f)
{
if(f > 0.5)
{
post("Shuffle: fraction too great - set to 0.5");
f = 0.5;
}
x->fraction = f;
}
void shuffle_bang(t_shuffle *x)
{
if (x->index == x->size)
{
int i;
for (i = 0; i < x->size_ptemp; i++)
{
x->ptemp[i] = x->pshuffle[x->size - 1 - i];
}
fillWithMin (x);
for (i = 0; i < x->size_ptemp; i++)
x->pshuffle[x->size - 1 - i] = x->ptemp[i];
shuffleDeck(x);
x->index = 0;
outlet_float(x->t_ob.ob_outlet, (float) x->pshuffle[x->index]);
}
else
outlet_float(x->t_ob.ob_outlet, (float) x->pshuffle[x->index]);
x->index++;
}
void *shuffle_new(t_floatarg be, t_floatarg en, t_floatarg frac)
{
t_shuffle *x = (t_shuffle *)pd_new(shuffle_class);
inlet_new(&x->t_ob, &x->t_ob.ob_pd, gensym("float"), gensym("ft1"));
inlet_new(&x->t_ob, &x->t_ob.ob_pd, gensym("float"), gensym("ft2"));
outlet_new(&x->t_ob, gensym("bang"));
if(frac > 0.5)
{
post("Shuffle: fraction too great - set to 0.5");
frac = 0.5;
}
x->fraction = frac;
if(be < en)
{
x->end = en;
x->begin = be;
}
else
{
x->end = be;
x->begin = en;
}
x->index = 0;
x->size = (int) x->end - (int) x->begin + 1;
x->size_ptemp = (int) (x->fraction * x->size);
x->pshuffle = malloc (x->size * sizeof(int));
x->ptemp = malloc (x->size_ptemp * sizeof(int));
fillWithMin (x);
shuffleDeck(x);
return (void *)x;
}
void shuffle_setup(void)
{
shuffle_class = class_new(gensym("shuffle"), (t_newmethod)shuffle_new,
(t_method)shuffle_free, sizeof(t_shuffle), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(shuffle_class, (t_method)shuffle_bang, gensym("bang"), (t_atomtype) 0);
class_addmethod(shuffle_class, (t_method)shuffle_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(shuffle_class, (t_method)shuffle_ft2, gensym("ft2"), A_FLOAT, 0);
class_addfloat(shuffle_class, shuffle_float);
srand( (unsigned)time( NULL ) );
}
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