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
- read out the current element with [tabread]
- store it in the right inlet of a [float]
- write the new value into the table with [tabwrite]
- increment your counter
- 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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