Re: questions about snapping centers

Mmh, I somehow didn't get Brynn's email.

The question was:

why are the rotation centers of the other objects inside the group not
available as snap targets, but only the group as a whole? Is this
intentional, or would it be possible to add them?

Maren

Am 08.11.18 um 21:37 schrieb Diederik van Lierop:
> 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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