[PD] Circular scrolling in pd

[Hans-Christoph Steiner]

I would convert the x,y coords from the trackpad to polar coords, then you have angle and radius.  Check out [mapping/polar], note that's meant to work with absolute coords like what you get from [cursor] or [mousestate].  [hid] will give you the relative data that mouse sensor gives.

.hc

On Jan 6, 2013, at 4:28 PM, James Dunn wrote:

> Hi,
> 
> I'm trying to implement circular scrolling with the trackpad in pd and am approaching it by dividing a circle into segments and trying to detect when the mouses moves from one segment to the other. At the moment I can only detect 4 segments (basically just the zero crossings) which is not really accurate enough.
> 
> How would I go about detecting the boundaries of the 12 segments in the attached patch (circscroll.pd)?
> 
> Eventually I want to detect speed and direction too - but perhaps there is a better approach?
> 
> any advice welcome.
> 
> thanks,
> 
> james
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