Using Sin for wave movements?

Hi,

I would like to integrate a wave-like movement for an enemy for shmup game. Similiar to the first enemies in R-Type. (Video Example)

I guess it would be best handled by using sin. But I have never used it before and have no idea how to set it up. So I wanted to ask for some basic explanation how to influence movements with sinus.

I tried this. Just to test how a sin value would influence the movement.

IF
Y pos of (enemy) <=50
THEN
Set X pos to X(enemy)+Sin(0.4)

But nothing at all happened. :p



So it would be really helpful, if someone would give me a basic explanation, about how to integrate sinus as a value for such a movement.

Thanks in advance.

Change your X code to
Set X pos to X("Enemy")+5*sin(Y("Enemy"))

where 5 is the amplitude of the wave.

Here's an example
http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=239278#Post2392 78

Just don't use the one labeled "CRASH".

Thanks for the replies.

I now understand how it works and it is a lot of fun, playing around with it. :)