"Mirroring" an angle.

Question

I need to obtain the supplement of an angle.

Exactly what I need to do is to implement some kind of code that mirror the angle, let's say, I have 45 degrees -> 135, another example: 80 ->100, 0 degrees -> 180, and so on.

Solved: I implemented this just a moment ago, and it worked perfectly, I use 180 - angle if angle < 180, and 360 - angle if angle >= 180.

Answer 1

I think you're after 180 - yourAngle.

Your examples:

• 45 degrees: 180 - 45 = 135
• 80 degrees: 180 - 80 = 100
• 0 degrees: 180 - 0 = 180

Answer 2

reflected_angle = 180 - ray_angle

Answer 3

Subtraction will probably work (if the universe is Euclidean).

http://en.wikipedia.org/wiki/Supplementary_angles

Answer 4

The simplest answer, based on what you appear to be asking about is

angle2 = 180 - angle1

Answer 5

If you view your "angle" as a 2D vector in the plane, you simply change the sign of the component normal to the "mirror" plane.

So, for example, a 45 degree angle (1, 1) "mirrored" in the yz-plane becomes (-1, 1).

Answer 6

Thx guys, I implemented this just a moment ago, and it worked perfectly, I use 180 - angle if angle < 180, and 360 - angle if angle >= 180.

All answers were ok.