Please, if someone could kindly help me, I'd sincerely appreciate:

I launch folowing question:

Does Inkscape present geometrical reference points for objects? For example:

Circle:
- center
- 4 quadrant points

Rectange:
- 4 corners or vertex
- 4 side line center points

Let's think following two usual situations:

1. Someone wants to catch a circle through its center, drag it until a rectangle corner and place the circle center (automatically aided) over the corner rectangle (similar as inkscape place automatically a object point over a grid point when you are displacing de object).

2. Someone wats to catch a circle trought any poin in its perimeter, drag it until other diferent circle perimeter and place the first circle (automatically aided) over the sencond so that both circles are tangent (by auto adjustment).

Thanks a lot again.

Hi.

Similar snapping can be done more or less, however not an exact match nor that handy as you want it to be.
http://tavmjong.free.fr/INKSCAPE/MANUAL/html/Snapping.html

With the circle, the bounding box's center is where the origo is at, so enable snapping of that .
To my experience snapping of bounding box center points only works on other bounding boxes, so if the rectangle you want to snap to it's corner is rotated, you have to do other steps as well.
(Like drawing a rectangle before with no rotation/skewing, that has it's corner at the right place; by enabling snapping to cusp nodes, it can be done easily.)

The second problem, tangent circles is a different story.
If you convert the circles to paths, and enable snapping to smooth nodes, and want to have tangent points in horizontal/vertical directions, it can work well, but finding tangent points in other directions -or finding tangent points between curved path segments- is not implemented.


To sum it up a bit:
the center of the circle and four quadrant points-once converted to path- are snappable,
corners of rectangles too
side midpoints may be added first -by converting to path and adding new nodes to selected path segments with the node tool.

lazur, Thanks so much for your kind reply.

Learnig snapping options has been very usefull for me an is exactly the concept I was requiring, even though all geometrical options were not taken into account.

Regards,