how about having the facility to have grids and guides rotated by the user, so that we're not just stuck with 90 degress horizontal and vertical.
like a live grid, perhaps linked to a layer if the user needs it be saved with a doc for whatever reason.
the user could define a grid, by dimensions, similar to how we do with wirth standard grids, but then have the option to rotate that grid to any angle they require.
(going one step further, perhaps perspective could be implemented as well, though how vanishing points are defined and placed is up for discussion.
1, 2, 3?)
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