Make gun vibrate?

[tvz]

Hello everyone,
I have a problem.
I want to make a rifle recoil, as it kickback when we shoot.
I dont want to use animation because it will tough for me to adjust many animations in one actor.
How can i make it do that with programming?
like in this image, the gun recoils only horizontally

[CrackedP0t]

You'll need a global int variable called "recoils" or something, and initialize it to -3.
I'm assuming that it will be part of a character that faces right and left, so make a "facing" int variable, and when the character faces left, set it to -1, and when it faces right, set it to 1.
You'll also need a timer called "recoiltimer" or something, that occurs 5 times.
When the shot is triggered, run this code in the gun actor:

Code: Select all

//Modify the "100" to make the kickback slower or faster.
CreateTimer("Event Actor", "recoiltimer", 100);


When the timer activates, run this code:

Code: Select all

x += sign(recoils) * facing * 10;
recoils++;
if ( recoils == 3) {
recoils = -3;
DestroyTimer("recoiltimer8");
                   }

}


Hope this helps!

[tvz]

Thanks
It worked
I modified it, changed the timer to 50 and set recoils to -1
+1



Just one question. What is the meaning of this line-
x += sign(recoils) * facing * 10;

[CrackedP0t]

No problem!

sign() means return -1 if the number is negative, 1 if the number is positive, and 0 if it's 0.

The line means:

Add to x:
10
times -1 if the number of recoils is negative, 1 if it's positive
times -1 if it's facing left, 1 if it's facing right.

So,
If number of times the recoil timer occurs is 6 (recoils = -3), the number of pixels it moves back is 10, and it's facing right, here's a timeline of the recoil:

1. sign(-3) * 1 * 10 = -10
   x += -10
2. sign(-2) * 1 * 10 = -10
   x += -10
3. sign(-1) * 1 * 10 = -10
   x += -10
4. sign(0) * 1 * 10 = 0
   x += 0
5. sign(1) *1 * 10 = 10
   x += 10
6. sign(2) *1 * 10 = 10
   x += 10
7. sign(3) *1 * 10 = 10
   x += 10

So we're back where we started.

That should hep you, but just ask if it doesn't.