day10, All Is Broken

day10/notes.org

@@ -18,3 +18,30 @@ but yeah, if i make initial filling in of the I, then i could just fill in all .
 and count I
 
 sounds like a plan
+** allright, i found main path, display all not on main path as ' '
+and the thing is a mess
+
+i don't know how to select a point to mark as 'I'
+
+but! if i select a point to mark as 'O'
+and then go around the main path, marking things on the side as 'O'
+then i would be able to fill in all which are neighbors of 'O' as 'O'
+and that would leave only 'I' to be counted
+
+so.
+
+how would i monitor consistent 'side' of the pipe during the walkhrough?
+if we go down - we color as 'O' one down.
+if we go angle - color two - one down and one to the right.
+and only color if it's not already on main path.
+
+i suppose so
+** so a new method for initial pass of 'O'
+well, i'll need access to the direction, in which the neighbor is taken?
+nooo. not direction, but the symbol. ok, this is easier
+
+but i'll need to mutate the field
+
+no, i do need direction.
+
+ok, let's go lunch maybe, and maybe it will be a place with a power outlet as well