symmetry to circles

[Anonymous]

Hi , why is it that when I try to use the symmetry constraint on circles , I can highlight point 1 and point 2 , but then I cannot pick the circle? 

what Im doing currently to center the circle is add a small construction line vertical to the circle center , and then pick point 1 , point 2 and then the construction line to center the circle between point 1 and 2 

[TheCADWhisperer]

---

@Anonymous wrote:

Hi , why is it that when I try to use the symmetry constraint on circles

---

You only have one circle.

Symmetry is two elements symmetrical about a linear reference. (More akin to mirror.)

Your construction line to midpoint is the correct technique.

(Or you could add Vertical constraint between midpoint and center point without the need for construction line.)

Vertical and then Shift select the midpoint...

[jeff_strater]

Do you want Symmetry, or Mirror?  Mirror will create a copy of the selected items about a symmetry line, while the Symmetry constraint requires you to select two already-existing objects and then a symmetry line.  See the screencast below:

[Anonymous]

I want the circle to be in between those 2 highlighted points .... if it were a line instead of a circle , all i would do is choose a symmetry constraint , then pick point 1 and point 2 and then choose the line, and that line will now be exactly in between points 1 and 2 .... however for some reason, circles cannot be chosen in the symmetry constraint ... so what I am doing is I put a small vertical construction line coincident with the circle center and then use the symmetry constraint 

[jeff_strater · Accepted solution]

"I want the circle to be in between those 2 highlighted points"

That is not what Symmetry does.  Symmetry makes two selected objects symmetric about a line.  That is why a line is required for the 3rd input.  If you just want the circle to be centered along that top line, you can either add construction geometry (as you already discovered), or make a Vertical constraint between the circle center and the center point of the top line in the rectangle.

[Anonymous]

Thanks !!!

is there a way to find the center of the line easily ? .. or do I have to put a construction line in the center of the line above and then use a vertical constraint to that construction line ? 

[Anonymous]

Nevermind ... Im messing about with it and I pressed shift and it found the center line 🙂 .... I'll use the vertical constraint to the centerline like you suggested ,,, cheers !!