Here is one, is this is what you mean..., 

https://github.com/XRoemer/puredata/tree/master/new_sequencer

this version is en html, but it was initially developed with pd's data structures. It worked very well, but used some Purr Data objects to draw, which makes it easier, but not impossible

On Mon, Apr 30, 2018 at 4:38 PM, Miller Puckette <msp@ucsd.edu> wrote:
There's an extremely crude one in "dodge-song" in the Pd repertory
project.  I'm sure there are much better ones running around on the net.

cheers
Miller

On Mon, Apr 30, 2018 at 11:20:32AM -0400, William Brent wrote:
> Has anyone done something like this using [struct]/[polygon], even just for
> sequence display purposes and not editable via mouse clicking/dragging? I
> did a quick search of the archives but haven't found anything.
>
>
> --
> William Brent
> www.williambrent.com
>
> “Great minds flock together”
> Conflations: conversational idiom for the 21st century
>
> www.conflations.com

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