Easy way to keeping angles between -179 and 180 degrees

Question

Is there an easy way to convert an angle (in degrees) to be between -179 and 180? I\'m sure I could use mod (%) and some if statements, but it gets ugly:

/         


        

Answer 1

This works with both negative and decimal numbers and doesn't require loops, nor trigonometric functions:

angle -= Math.floor(angle / 360 + 0.5) * 360

The result is in the [-180, 180) interval. For (-180, 180] interval, you can use this instead:

angle -= Math.ceil(angle / 360 - 0.5) * 360