Function unitMark

Return two points parallel to line s1 using its normal line s2.

unitMark(s1, s2, padding): Vec2[]
Parameters
- s1: Line
  First line
- s2: Line
  Second line (normal to s1)
- padding: Num
  Padding distance
Returns Vec2[]
Two points for unit mark
- Defined in bloom/src/core/computation.ts:985