Lets say a user draws a polygon. Great. Easy Stuff.

Now they're drawing another polygon. Basically, I want the point they
clicked on (to create a corner) to "snap" to the edge of another
polygon if that polygon's edge is within, say, 5 meters of their
click.

I need help on planning this out. I'm confident we can implement this,
but the logic/data structure used is what's escaping me.

Thoughts?

Thanks!

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