[PD] Array that scrolls from right to left
cyrille henry
cyrille.henry at la-kitchen.fr
Tue Feb 24 15:08:45 CET 2009
hello,
have you tried to look at mapping/timeroll object.
it's exactly what franck describ...
cyrille
Sebastien Lelong a écrit :
> Hi Frank,
>
>
> Thanks for your help. I'm getting things that "kind of" scroll...
> building an horrible patch :) Some values are random, I guess I have a
> problem when access extremities of the array. I'm sure there's something
> simpler, probably using trigger, but I can't figure out how I could use
> a trigger here. Could you give one last hint ? I guess I need to learn
> how to "think" pure data...
>
> Anyway, thanks again.
>
> Cheers,
> Seb
>
>
>
> Hallo,
> Sebastien Lelong hat gesagt: // Sebastien Lelong wrote:
>
> > I've recently discovered Pure Data as versatile platform I could
> use to
> > build a robotic GUI. The idea is to collect data from a robot,
> send it to an
> > OSC (open source control) server, get the data in pd~ and deal
> with it. One
> > important aspect would be to plot data, in real-time, so the
> graph scrolls
> > from right to left, and data is appended to the end of array
> (right) (well,
> > I hope what I write is understandable...).
> >
> > So far so good, I've been able to build all the OSC part, and
> even plot
> > things in a array in pd~, but I can only find a way to plot data
> from left
> > to right, and when array's end is reached, clear it and start
> from beginning
> > again. In other words, I can't make it scroll...
>
> One simple way to make it scroll would be to use [list-lastx
> <TABLESIZE>] from the [list]-abs collection. Just prepend a 0 to the
> outgoing list and send it to a receiver named after the table like this:
>
> [table DATA 16]
>
> [r ROBOT]
> |
> [list-lastx 16]
> |
> [list prepend 0]
> |
> [s DATA]
>
> Alternatively do it manuall. The basic algorithm is this:
>
> If a new ROBOT-float comes in store it. Then start a loop over the table
> where you
>
> 1) read out the current element with [tabread]
> 2) store it in the right inlet of a [float]
> 3) write the new value into the table with [tabwrite]
> 4) increment your counter
> 5) repeat using the float stored in 2) as the new value.
>
> This is a good excercise to get familiar with the [trigger] object and
> Pd's execution order.
>
> Ciao
> --
> Frank
>
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>
>
> --
> Sébastien Lelong
> http://www.sirloon.net
> http://sirbot.org
>
>
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