Get wall angle (wall bouncing missile)

[Diegoit]

FOR HORIZONTAL WALLS
Set angle[1] = (Facing of (Picked unit))
Set angle[2] = (360.00 - angle[1])

FOR VERTICAL WALLS
Set angle[1] = (Facing of (Picked unit))
Set angle[2] = (360.00 - angle[1])
Set angle[2] = (angle[2] - 180.00)

But how can i get the wall angle? please help
Im trying to do a wall-bounce missile, it works good but now i need to get the wall orientation :/

 

[Cokemonkey11]

@Diegoit it turns out that you don't have to calculate wall orientation to collide with walls that only take on two angles

Instead you can simply apply collision of angle 1, then test if the result is walkable. If that test fails, then apply the collision of angle 2. This is an AND operation.