Hi Ditto, you just do the same thing for the vertical direction - maybe you're not releasing the end point of the second construction line at the right spot. It's not enough just to make the second construction line vertical alone, you need to do the mouse down on the circle center, then drag it and do the mouse up at the "Int, Perp" snap on the median line. The distance between the start point and the up point of the second cline is significant. It's then that distance from the start point of the cline to the release point that is reflected with an additional "End" snap that has the mirrored location that you want.

Here's how it looks using your file:



- Michael

So the basic mechanism that this is using is the "reflected endpoints" of the construction line.

If you drag out a construction line with the mouse down starting point and the mouse up release point like this:




The distance between those points is used to create additional End snaps, extended by the same distance on the other side, like this:






When applied perpendicular to a central axis that gives a mirrored point around the axis.

You can also use that distance in a couple of other ways too, like "capture" a distance between 2 points and reapply that distance elsewhere by holding down on the little menu launcher tag and picking relocate or reorient cline, and also you can put in a division number on that little menu to enable "div snap" to do things like snaps at 1/5 or whatever you want increments along that distance.

- Michael

Again, the bug sat in front of the screen. Thank you Michael for these detailed explications. You were right, I didn't release the cline construction at the right point.

Thanks again!

Ditto

Oh my... the div snap and relocate stuff is incredible I should use it more :)

It's by far the best construction lines in any software ever made (it should be the same in Illustrator and Indesign haha)