Retrieving an ability's AoE

Say I have a spell, like blizzard, where it gives a large radius circle to show the AoE of the spell before casting. What is the JASS native(s) that finds the units in the spell's AoE?

There isn't one.

Additionally, abilities affect any unit whose collision radius intersects the AoE, while JASS takes the centre of the unit.

Damn.

So my best bet would be to use
and have the radius match the size radius of the spell's intended AoE, and use a targetting spell instead?
(yes I know it's a BJ but it saves 3 lines of code, if not more, depending)

GetRectFromCircleBJ creates a rect which is the smallest square which could enclose your circle. So unless you want your AoE to be a square...

Grr.

So what native DOES create a circular rect?
What I wanted was to pick # random units from a circular rect and perform an action on them. (Using the pick random unit from group native (yes i know that's not it's name, the name escapes me right now.))

There is something like "Pick every unit in range and do..." in GUI

There is no such thing as a circular rect. Rects are square. The difference between GroupEnum and the actual skills with collision size in is fairly minor. If you Enum for radius+32 it should be close enough for practical purposes.

Good enough. Thanks blu.

...Coulda sworn I saw a native for a circular rect or something like that.

Ok, I actually lied there. Rects aren't square, except when they are. Rects are rectangular (as the name might imply). Rects cannot have anything but 4 straight, (opposite) parallel sides. Oh yeah, with corner right angles.

YOu can however create a circular REGION. I think peppar made a function that did so, I will raise the bet and say that you can still find this function in wc3jass.com

He did and you can. Though that is just a large set of small rects. I doubt whether it's really necessary for such an application.

Not true