cases to foresee: 0. starting the road, previous dot has one connection 1. starting the road, previous dot has >1 connections > crossroad 2. along the road, current dot has two connections 3. along the road, current dot has >2 connections > crossroad 4. end of the road, current dot has one connection 5. end of the road, current dot has >1 connections > crossroad
Isle::collect_oriented_segments(Road* r)
A B C o ----> o ----> o ^ | | D
[f] [f] [b] [b] [f] AB > BC > CB > BA > AB
[f] [b] [f] [f] [b] [b] [f] AB > BD > DB > BC > CB > BA > AB
A B C
o ----> o ----> o
|
|
v
D
[f] [f] [b] [f] [b] [b] [f] AB > BD > DB > BC > CB > BA > AB
cases [2,5] can happens simultaneously
A B C
o ----> o ----> o
|
|
v
D
[f] [f] [b] [f] [b] [b] [f] AB > BD > DB > BC > CB > BA > AB
cases [2,5] can happens simultaneously
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