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/*
flext tutorial - attributes 2
Copyright (c) 2002 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
-------------------------------------------------------------------------
This is an example of an object doing various float operations
*/
// IMPORTANT: enable attribute processing (specify before inclusion of flext headers!)
// For clarity, this is done here, but you'd better specify it as a compiler definition
// FLEXT_ATTRIBUTES must be 0 or 1,
#define FLEXT_ATTRIBUTES 1
// include flext header
#include <flext.h>
// check for appropriate flext version
#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 401)
#error You need at least flext version 0.4.1
#endif
#include <math.h>
class attr2:
public flext_base
{
// compulsory flext header with a class setup function
FLEXT_HEADER_S(attr2,flext_base,setup)
public:
// constructor
attr2();
protected:
void m_trigger(float f);
// stored argument of operation
float arg;
// stored result
float res;
enum operation {
op_set,op_add,op_sub,op_mul,op_div,op_pow
} op;
static const t_symbol *sym_set,*sym_add,*sym_sub,*sym_div,*sym_mul,*sym_pow;
private:
static void setup(t_class *);
// callback for method "m_trigger" (with one float argument)
FLEXT_CALLBACK_F(m_trigger);
// define attribute callbacks for variable "arg" ("ATTRVAR" means GET and SET)
FLEXT_ATTRVAR_F(arg);
// define attribute callbacks for variable "res" (GET only)
FLEXT_ATTRGET_F(res);
// methods for getting/setting the operation mode
void opget(const t_symbol *&s) const;
void opset(const t_symbol *&s);
// define attribute callbacks for variable "res" (GET only)
FLEXT_CALLGET_S(opget);
FLEXT_CALLSET_S(opset);
};
// instantiate the class
FLEXT_NEW("attr2",attr2)
// instantiate static variables
const t_symbol
*attr2::sym_set,
*attr2::sym_add,*attr2::sym_sub,
*attr2::sym_div,*attr2::sym_mul,
*attr2::sym_pow;
void attr2::setup(t_class *)
{
// Upon class creation setup some symbols
// This is done only upon creation of of the first "attr2" object
sym_set = MakeSymbol("=");
sym_add = MakeSymbol("+");
sym_sub = MakeSymbol("-");
sym_mul = MakeSymbol("*");
sym_div = MakeSymbol("/");
sym_pow = MakeSymbol("**");
}
attr2::attr2():
arg(0),res(0), // initialize argument and result
op(op_set) // initialize operation
{
// define inlets
AddInAnything(); // first inlet of type anything (index 0)
// define outlets
AddOutFloat(); // one float outlet (has index 0)
// register method (for floats) "m_trigger" for inlet 0
FLEXT_ADDMETHOD(0,m_trigger);
// register attribute "arg" with the variable "arg"
FLEXT_ADDATTR_VAR1("arg",arg);
// register attribute "result" with variable "res"
FLEXT_ADDATTR_GET("result",res);
// register attribute "op" with methods "opget" and "opset"
FLEXT_ADDATTR_VAR("op",opget,opset);
}
// receive an operand, do the math operation and trigger the output
void attr2::m_trigger(float f)
{
switch(op) {
case op_set: res = f; break;
case op_add: res = f+arg; break;
case op_sub: res = f-arg; break;
case op_mul: res = f*arg; break;
case op_div:
if(arg) res = f/arg;
else {
post("%s - argument to division is 0: result set to 0",thisName());
res = 0;
}
break;
case op_pow: res = (float)pow(f,arg); break;
#ifdef FLEXT_DEBUG
default: ERRINTERNAL(); // operation not defined
#endif
}
// output value to outlet
ToOutFloat(0,res); // (0 stands for the outlet index 0)
}
// report the operation mode
void attr2::opget(const t_symbol *&s) const
{
switch(op) {
case op_set: s = sym_set; break;
case op_add: s = sym_add; break;
case op_sub: s = sym_sub; break;
case op_mul: s = sym_mul; break;
case op_div: s = sym_div; break;
case op_pow: s = sym_pow; break;
#ifdef FLEXT_DEBUG
default: ERRINTERNAL(); // operation not defined
#endif
}
}
// set the operation mode
void attr2::opset(const t_symbol *&s)
{
if(s == sym_set)
op = op_set;
else if(s == sym_add)
op = op_add;
else if(s == sym_sub)
op = op_sub;
else if(s == sym_mul)
op = op_mul;
else if(s == sym_div)
op = op_div;
else if(s == sym_pow)
op = op_pow;
else {
post("%s - operation is not defined, set to =",thisName());
op = op_set;
}
}
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