[Solved] Rotation

[blacknight962]

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[Ryns]

The above returns 2.03122, and the correct rotation is 5.17278(?).

5.17278 - 2.03122 = 3.14156 ... or as it prefers to be called Pi

So you are calculating the opposite angle, the math is the wrong way around, try:

atan2(targetY - currentY, targetX - currentX);

[blacknight962]

The content of this post has been removed.

[psyf4]

2*PI + -1.11038 = 5.1728, so yes, it's the same. However if you're trying to rotate by a certain amount rotating by -1.1104 would be much faster than my 5.1728 (if you rotating using keyboard or whatever your problem is, if it is limited to a certain amount of degree or radian per second; interestingly, wow rotates by PI radian per second).
If you must have a positive value, learn a bit of trigonometry (Wikipedia: Unit Circle) and you'll quickly understand why you just need to add 2*PI (one full rotation). If you want to go through a rotation (like I do using the keyboard), subtract 2*PI if (while) angle > PI.
ie
//This will make sure you never go more than 180 rotating with the keyboard, even if somehow you added more than one full rotation
while rotation > PI: rotation -= 2*PI
while rotation < PI*-1: rotation +=2*PI

or
if rotation > PI: rotation -= 2*PI
if rotation < PI*-1: rotation += 2*PI

or in your case
if rotation < 0: rotation += 2*PI