java - 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:

//Make angle between 0 and 360
angle%=360;

//Make angle between -179 and 180
if (angle>180) angle-=360;

It just seems like there should be a simple math operation that will do both statements at the same time. I may just have to create a static method for the conversion for now.

question from:https://stackoverflow.com/questions/2320986/easy-way-to-keeping-angles-between-179-and-180-degrees

Answer 1

// reduce the angle  
angle =  angle % 360; 

// force it to be the positive remainder, so that 0 <= angle < 360  
angle = (angle + 360) % 360;  

// force into the minimum absolute value residue class, so that -180 < angle <= 180  
if (angle > 180)  
    angle -= 360;