Re: questions about snapping centers

Hello Brynn,

On 11/06/2018 01:40 AM, brynn wrote:
> Hi Friends,
>        Here's the setup.  Snap the center of one object of a group (of 
> 2 or more objects) to the center of a rectangle.
>
>        If you use the option "Snap an item's rotation center", it 
> won't work. Inkscape wants to snap the center of the group to the 
> center of the rectangle. 

I think this work as intended, as far as I can tell. It can be confusing 
though. Inkscape tries to snap the ROTATION center of the group to the 
ROTATION center of the rectangle. This rotation center of the group 
however does not coincide with the center of the object, so snapping 
likely occurs on a different position than you might have expected.

>        Questions:
>
> 1 -- Is there a bug involved in the above scenario?

I think it works as it should.

> 2 -- Exactly what is the purpose for "Snap center of objects" compared 
> to "Snap an item's rotation center"?

When creating technical drawings, it can be very useful to rotate one 
object around some point on another object, or around the intersection 
of two guide lines, or whatever. In that case, the rotation center of 
the object is moved (snapped) to that other point, and hence it is 
located far away from the center of the object itself. To still allow 
snapping to the center of the object, one cannot use the rotation center 
anymore, as this is located far away. In such a situation one can use 
snapping to the center of the object, instead of snapping to the 
rotation center.

> 3 -- Could the tootip text (for one or both options) be improved, to 
> better represent how they work?

I'm guessing that the main problem is the subtle difference between the 
"rotation center" and the "object center". Maybe it would be good to 
rename the "rotation center" to "rotation origin"? If we remove the 
"center" part of "rotation center", then it's no longer implicitly in 
the center of the object. Even better would be "transformation origin", 
as it is also used for skewing. But this might be too technical, I don't 
know. Anyway, it would have to be changed in more places than only in 
the tooltip, likely.

Best regards,

Diederik


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