[PD] Array that scrolls from right to left

Sebastien Lelong sebastien.lelong at gmail.com
Wed Feb 25 10:44:40 CET 2009

Hi guys,

Thanks for all your suggestions and explanations ([trigger], [;semicolon
message( acting a senders, dollars init variables vs. other dollar
variables, the magic of $0, ...). Since I'll probably put a lot of scrolling
graphs in my app, I think I'll go with the initialization argument solution
and modify pdd_scroll as needed.

Cyrille, I did not have time to test mapping/timeroll yet. I guess this is
in SVN extensions/abstractions/externals/.... I need to dig extensions in
order to find ones I could use (widgets like gauges, knob, etc...).


Hi Sebastien,
>  Sebastien Lelong hat gesagt: // Sebastien Lelong wrote:
>>> I have one question though (not related to [trigger]). In your example,
>>> as
>>> in Martin's, you use $0-a16 to name the array. I understand $0 is used
>>> when
>>> building an abstraction and creating multiple instances of this
>>> abstraction.
>>> My question is how can I configure this array, from the parent (from the
>>> patch using the abstraction) ? For instance, I'd like to add "xticks",
>>> "ylabel", etc... I usually use a message, like:
>>> _________________
>>> [array1 ylabel -1 0 1 (
>>> but the same with $0-a16 obsviously doesn't work, since $0 is not known
>>> (I
>>> understand it's a counter incremented at each creation).
> if there aren't too many of those arrays in your patch, probably Frank's
> solution is far more simple and convenient.
> another possibility would be using creation arguments as names. you would
> then use $1-arrayname in an abstraction instead of $0-arrayname which uses
> the first creation argument of the abstraction in your parent patch. (so $2
> stands for the second creation argument and so on)
> if you create an object [myabstraction something]  in your parent patch you
> can access the array's properties by sending for example
> [ylabel -1 0 1(
> |
> [s something-arrayname]
> or like you wrote before using
> [; something-arrayname ylabel -1 0 1(]
> also have a look at /doc/2.control.examples/14.dollarsigns.pd for more
> stuff with dollar signs as creation arguments. (i found it kind of confusing
> the first time, so perhaps better don't try too hard and have a look later
> again)
> notice that dollar signs in messages like
> [$1 $2 (
> are not the same as dollar signs from creation arguments. That's one thing
> which can also seem strange when learning pd...
> Just try the below to understand what dollar signs stand for in messages.
> [one two three four(
> |
> [$2 $3 $1(
> |
> [print]
> Dollar sings in messages like the above are not affected by creation
> arguments, by default they return 0 (and an error message, just click on the
> message [$2 $3 $1( directly to see that).
> in the ppd_scroll abstraction you would have to change each $0-graph into
> $3-graph (because $1 and $2 are already in use) and then create instances of
> it like [ppd_scroll 10 1 myname] and send settings to myname-graph then.
> cheers,
> Martin

Sébastien Lelong
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