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#ifdef NT
#include "stdafx.h"
#include <io.h>
#endif
#include "m_pd.h"
#include <stdlib.h>
#include<time.h>
#include "prob.h"
/**
* The prob object is designed to generate random events
* with a given probability - essentially every clock tick
* it looks to see if it should generate an event or not
*/
static t_class *prob_class;
/**
* clock tick - do a bang and wait the next
* time delay in the list
*/
static void prob_tick(t_prob *x)
{
if ( x->x_running )
{
if ( prob_event( x) )
{
outlet_bang(x->x_obj.ob_outlet);
}
clock_delay(x->x_clock, x->x_time );
}
}
/**
* prob event looks to see if we should generate and event or not
*/
static int prob_event( t_prob* x )
{
int ret = 0;
if ( rand() < x->x_probability * RAND_MAX)
{
ret = 1;
}
return ret;
}
/**
* a bang causes a reset to the start of the bar - used to
* synchronize multiple prob's. If the rhythm is not
* running it is started
*/
static void prob_bang(t_prob *x)
{
x->x_running = 1;
clock_delay(x->x_clock, x->x_time );
}
/**
* a stop message turns us off
*/
static void prob_stop(t_prob *x)
{
x->x_running = 0;
}
/**
* free our clock and our timer array
*/
static void prob_free(t_prob *x)
{
clock_free(x->x_clock);
}
/*
* make a new prob - we can provide a list of times
* so read these in too
*/
static void *prob_new(t_float t , t_float probability )
{
t_prob *x = (t_prob *)pd_new(prob_class);
prob_set_time( x , t );
prob_set_probability( x , probability );
x->x_running=0;
// make us some ins and outs
x->x_clock = clock_new(x, (t_method)prob_tick);
outlet_new(&x->x_obj, gensym("bang"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("time"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("probability"));
return (x);
}
/**
* set the probability
*/
static void prob_set_probability( t_prob *x, t_float f )
{
if ( f < 0 )
{
post("probability must be between 0 and 1 ");
f = 0;
}
else if( f > 1 )
{
post("probability must be between 0 and 1 ");
f = 1;
}
x->x_probability = f;
}
/**
* set the time
*/
static void prob_set_time( t_prob *x, t_float f )
{
x->x_time = f;
}
/**
* make a new one and setup all of our messages
*/
void prob_setup(void)
{
srand( (unsigned) time( NULL ) );
prob_class = class_new(gensym("prob"), (t_newmethod)prob_new,
(t_method)prob_free, sizeof(t_prob), 0, A_DEFFLOAT , A_DEFFLOAT, 0);
class_addbang(prob_class, prob_bang);
class_addmethod(prob_class, (t_method)prob_stop, gensym("stop"), 0);
class_addmethod(prob_class, (t_method)prob_bang, gensym("start"), 0);
class_addmethod(prob_class, (t_method)prob_set_probability, gensym("probability" ), A_FLOAT, 0);
class_addmethod(prob_class, (t_method)prob_set_time, gensym("time" ), A_FLOAT, 0);
class_sethelpsymbol(prob_class, gensym("mjLib/prob"));
}
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