[etoys-dev] x-y plane issue

[Scott Wallace]

On Mar 13, 2012, at 10:48 PM, karl ramberg wrote:
> 
> Playfield have a option to have origin at center.
> I think we should set that to true on the graphing examples
> Or at least show where it can be set.


This came up last week in this exchange:

On Mar 5, 2012, at 1:56 PM, Steve Thomas wrote:

>> I was also struck that the playfield does not use origin at center, but there is much I do not understand.
> 
> When using the number-lines as axes, the "origin" would be where the two orthogonal number lines intersect, ideally at their zero points.  This situation doesn't leave much room for a playfield's originAtCenter setting to play any role.

  -- Scott
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