target/generated-sources/template/com/flowpowered/math/GenericMath.java
public static double wrapAngleRad(double angle) {
        angle %= TrigMath.TWO_PI;
        if (angle <= -TrigMath.PI) {
            return angle + TrigMath.TWO_PI;
        }
        if (angle > TrigMath.PI) {
            return angle - TrigMath.TWO_PI;
        }
        return angle;
    }
public static double wrapAngleRad(double angle) {
        angle %= TrigMath.TWO_PI;
        if (angle <= -TrigMath.PI) {
            return angle + TrigMath.TWO_PI;
        }
        if (angle > TrigMath.PI) {
            return angle - TrigMath.TWO_PI;
        }
        return angle;
    }
Wraps the radian between -PI and PI

@param angle to wrap
@return -PI < radian <= PI