[etoys-dev] x-y plane issue

[karl ramberg]

On Wed, Mar 14, 2012 at 4:38 AM, Steve Thomas <sthomas1 at gosargon.com> wrote:

> Scott,
>
> I would think ideally when setting the grid size on a x-y plane, the major
> gridlines would line up with the x-y axis by default.  But it seems when
> drawing the graph paper you start from the top left to draw your grid
> lines.  In doing so the grid lines do not align with the x-y axis (see
> picture below):
> [image: Inline image 1]
>
> While starting at the top left to draw grid lines makes sense for graph
> paper, perhaps for x-y plane, it would be better to align with the default
> position of the x-y axis.
>
> This becomes more of a problem when placing objects in the x-y plane as
> evidenced by the picture below, where I place a transparent circle at 8,4,
> but as the magnifier shows it does not align at the intersection of the
> grid.  This is because the grid is not aligned with the number lines.
> [image: Inline image 2]
>
> Stephen
>
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>
> 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.

Karl
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