[PD] acceleration - deceleration between coordinates - how to do this?

Hans-Christoph Steiner hans at at.or.at
Tue Mar 16 21:18:38 CET 2010

There are lots of curve objects in the mapping library for this.  The  
mapping lib works on all 0-1 range, so make your [line] generate a  
ramp from 0 to 1 in the time you want.  Then after the [line], use a  
curve object.  They are named after the shape and types of segment.

	sigmoid (S-shaped)
	seat (like you sit in)


I'd start with [exponential_sigmoid].  You'll most likely want a  
sigmoid shape for the accel/deccel pattern you describe.


On Mar 16, 2010, at 3:59 PM, Thomas Jeppesen wrote:

> Hi guys,
> I'm working on a patch (rjdj scene) where I'm moving a little object  
> around on a plane. The object is been given random coordinates which  
> it is supposed to gradually move to in five seconds.
> Right now my solution is to bang the x- and y-coordinates into a  
> line-object which works fine, but I'd prefer for the movement to be  
> more "natural". By natural I mean that the object accelerates in the  
> beginning and then decellerates near the end until it comes to a  
> full stop at the exact coordinates that where randomly produced..
> I've been trying to get my head around a solution for quite a while  
> now, but unfortunately no luck so far.
> I'm sure this must be simple stuff for some of you PD-geniuses out  
> there, and I'm hoping that one of you will stand up and show me how  
> it's done :)
> Thanks in advance,
> Thomas :)
> _______________________________________________
> Pd-list at iem.at mailing list
> UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list


"A cellphone to me is just an opportunity to be irritated wherever you  
are." - Linus Torvalds

More information about the Pd-list mailing list