Abs with Sin to make Enemy go forward and back?

Hiya all,

Correct me if I am wrong...the command called Abs which does the trick with sin or cos to make the enemys go forward and back...

???

Abs is nothing to do with Sin or Cos. You might be looking for Atan2 but I don't know since you haven't said exactly what you're trying to do.

ABS will take make any number positive, ie ABS(-1) = 1

No idea what you're talking about with the "does the trick with sin or cos to make the enemys go forward and back"

However, for you run a counter from 0 to 359 ie

count = (count + 1) mod 360

x = sin(count) * [distance to move]

because sin ranges from -1 to 1 you will make things move left and right.

What I am trying to do is make the enemys go forward and backward just using one commands....

so you say ATAN2....how do I do that in the code to make the enemys forward and backward?

Explanation in my previous post.

c=0

Repeat
Cls

For x=-10 To 10
	Text 200+(x*10),(Sin(c+(x*10))*50)+100,"X",True,True
Next

c = (c+1) Mod 360
Flip

Until KeyHit(1)

That was interesting sin wave you got there. :)

it is Platform game I am making. For now I using just two IF command to make the enemys go forward and backward but I am sure there is just one command to make the enemys go forward and backward.

Hello.

Perhaps this is what you mean? I'm not at work so I can't be sure what's happening. Obviously, it's all my own original code too ;o)

Perhaps what HotShot is trying to acheive is drawing a circle but only changing the x or the y element - that does have the affect of moving back and forth. (BTW, I'm assuming that's what the amended code is doing)

Code Removed

Goodbye.

Hello.

Ok, it's BlitzMax but easy enough to convert

Strict

Graphics 800,600,0

Local i:Int

While Not KeyDown(KEY_ESCAPE)
	Cls
	i:+1
	i:Mod 360
	If (i>180) Then SetColor 255,255,0 Else SetColor 0,0,255
	DrawOval 100*(Sin(i+90))+400,300,8,8
	Flip
Wend

End

Is that what you mean?

Goodbye.

yep that right Soggy :) wicked

the alternative what you most likely are looking for is signum (sgn) which returns -1, 0, 1 depending on the input is < 0, 0, > 0