multislider like UI

    klaus filip
    Jan 20 2011 | 4:48 pm
    hello there, first i want to thank everybody who helped me with my basic questions building my first GUI. i could not make it without this forum. it seems to be ready and can be found here: http://ppooll.klingt.org/index.php/max_externals
    however here is my next Q:
    i want to add list-abiltity to that UI and i am not sure which data-type is best to make it going (lists of floats). basically it should do the same as multislider (including pattr communication). t_linklist seems to be the choice, right ? what is used in multislider?
    best klaus
    • klaus filip
      Jan 21 2011 | 3:55 pm
      basically the external should do the same as a multislider. (having the multislider.c as an example would save me a lot of time of course) but it will have a few additions (as in ll_number), like displaying the value as number, allowing the arrow- and number keys for input write labels in the slider. etc
    • Emmanuel Jourdan
      Jan 21 2011 | 5:11 pm
      multislider stores the values into an array of t_atom or double.
    • klaus filip
      Mar 25 2011 | 9:02 pm
      hello again, finally got some time left to resume on this project.
      but i am still stuck on how to deal with lists. namely how to put the correct pattr-comunication... the following try is very close i guess, but crashes.
      t_max_err MY_getvalueof(t_MY *x, long *ac, t_atom **av)
{
        short i;
	if (ac && av) {
		if (*ac && *av) {
			//memory passed in use it
		} else {
			*av = (t_atom *)getbytes(sizeof(t_atom)*x->listlen);
		}
		*ac = x->listlen;
		for (i=0; i < *ac; i++, av++) {
			atom_setfloat(*av,x->myval[i]);
		}
	}
	return MAX_ERR_NONE;
}
      any advices?? thanks klaus
    • Luigi Castelli
      Mar 25 2011 | 9:18 pm
      Hi Klaus,
      there are functions in the Max/MSP API that make this sort of thing a lot easier and less error prone... I would do:
      t_max_err MY_getvalueof(t_MY *x, long *ac, t_atom **av)
{
    if (ac && av) {
        char alloc;
        if (atom_alloc_array(x->listlen, ac, av, &alloc)) {
            return MAX_ERR_OUT_OF_MEM;
        }
        atom_setfloat_array(*ac, *av, x->listlen, x->myval);
    }
    return MAX_ERR_NONE;
}
      Let me know if it works for you.
      Cheers.
      - Luigi
    • klaus filip
      Mar 26 2011 | 12:29 am
      yes worked, thanks luigi.
      i can tumble forward. klaus