angle math question

[aseminov]

Hello,

I have a principle angle system that looks like this:

                             0
                             |
                             |
                    -90 ----------- 90
                             |
                             |
                           +-180

given 2 angles angle1 and angle2, I need to write code that will determine if angle2 falls between 135 degrees and -135 degrees away from angle1. Here are some sample values:

angle1    range of angle2 values     
------------------------------------
  0              135 to -135           
90             -135 to -45
180             -45 to 45
-90               45 to 135

Does the following algorithm work in all cases?

int angleDistance = abs(angle1-angle2);
if(angleDistance >= 135)
    return true;
else
   return false;

Thanks!