[QUOTE=luisgmolina] Your theory is good but only good for a bullet traveling on a fixed path.
In my case I need to know which way (left or right). a bullet of fire like mario bros type when you get a flower.
when the path changes, the formula is still valid I guess, and the VectorX I wrote is a negative number when going to the left, a positive when going to the right , and 0 if not travelling on the X axis(since the cosinus can be negative or positive or equal to 0 with the angle)
but still, this is a tricky formula, and I'm pretty sure a more understandable method can be foundAphrodite2013-04-28 00:59:31
And that is why you shall respect the bug reports guidelines, not only giving a capx is making the bug reproductible in one click in a situation they can work with (less time wasted trying to reproduce vague instructions) but also it helps filtering false positives.
Game design is all about decomposing the core of your game so it becomes simple instructions.