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/*
* HOWTO write an External for Pure data
* (c) 2001-2006 IOhannes m zmölnig zmoelnig[AT]iem.at
*
* this is the source-code for the second example in the HOWTO
* it creates an object that increments and outputs a counter
* whenever it gets banged.
*
* for legal issues please see the file LICENSE.txt
*/
/**
* include the interface to Pd
*/
#include "m_pd.h"
/**
* define a new "class"
*/
static t_class *counter_class;
/**
* this is the dataspace of our new object
* the first (mandatory) "t_object"
* and a variable that holds the current counter value
*/
typedef struct _counter {
t_object x_obj;
t_int i_count;
} t_counter;
/**
* this method is called whenever a "bang" is sent to the object
* a reference to the class-dataspace is given as argument
* this enables us to do something with the data (e.g. increment the counter)
*/
void counter_bang(t_counter *x)
{
/*
* convert the current counter value to floating-point to output it later
*/
t_float f=x->i_count;
/* increment the counter */
x->i_count++;
/* send the old counter-value to the 1st outlet of the object */
outlet_float(x->x_obj.ob_outlet, f);
}
/**
* this is the "constructor" of the class
* we have one argument of type floating-point (as specified below in the counter_setup() routine)
*/
void *counter_new(t_floatarg f)
{
t_counter *x = (t_counter *)pd_new(counter_class);
/* set the counter value to the given argument */
x->i_count=f;
/* create a new outlet for floating-point values */
outlet_new(&x->x_obj, &s_float);
return (void *)x;
}
/**
* define the function-space of the class
*/
void counter_setup(void) {
counter_class = class_new(gensym("counter"),
(t_newmethod)counter_new,
0,
sizeof(t_counter),
CLASS_DEFAULT,
A_DEFFLOAT, 0); /* the object takes one argument which is a floating-point and defaults to 0 */
/* call a function when object gets banged */
class_addbang(counter_class, counter_bang);
}
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