Windows GMS Studio 2 Code Error

[Anhorakk]

Dear GMC,

Hiya there! First of all let me introduce myself, my name is Mathis and i live in Canada. I am aged of 16 years old and i have recently been trying to learn 2D gave developpement with Game Maker Studio 2. However, recently, when i was making lines of codes, i tried to launch to see if everything was correct and i've gotten a unexpected error code coming out. I do not understand what is going on wrong.
Thanks in advance for your generous help, i really appreciate it!

Sincerely,

Anhorakk

 

[TsukaYuriko]

You did not declare the variable COLLISION. I'm not even sure if you're trying to use a variable there, so please tell us what you're trying to do at line 25.

 

[Anhorakk]

Hey, sorry i am still new in the domain, let me explain what i am trying to do. I am currently working on trying to make collision stuff. In other words i want to make a system that will make sort that if my character touches an object as an example, a wall, my character will just stop on the borders of the wall instead of passing through it.

 

[Anhorakk]

I don't know if this is clear enough, i am trying to explain, but first English is not my main language and i am still new in developing so yea, i might not be really clear. Let me know if you need more specifications!

 

[TsukaYuriko]

Writing if (COLLISION) will not check for collisions.

What you're looking for is a Collision event or functions like place_meeting. Both of them are covered extensively in the manual.

 

[Anhorakk]

Oh, sorry i have just realized i was talking of the wrong thing, my bad. But yea i also gotta set the collision checks, in this case what i meant to do is to set a thing that if a collision happens with a wall, the character will as an example move backwards from 1 frame. Sorry for the misunderstanding ^^'

 

[Anhorakk]

Writing if (COLLISION) will not check for collisions.

What you're looking for is a Collision event or functions like place_meeting. Both of them are covered extensively in the manual.

We might want to close this Thread, i've just realized i made a mistake in my explanation. I will remake my thread with the good informations?

 

[Toque]

You might want to watch cosmonauts tutorials. Space rocks and brick breaker.

It will help with collisions and probably answer this question and the next ten problems you run into.

 

[Anhorakk]

Yea i tried, but i still don't understand what the error code is supposed to mean ^^'

 

[Edwin]

In fact, thread title says "GameMaker: Studio Studio 2 Code Error".

 

[FrostyCat]

Yea i tried, but i still don't understand what the error code is supposed to mean ^^'

The error message means what it says, and TsukaYuriko has already made herself clear. You didn't give COLLISION a value before trying to use it, and it's not a built-in variable. It's illegal in GML to reference a variable before having given it a starting value.

On this line you are depending on the value of a variable named COLLISION:

if (COLLISION) {

But at no point in time before this line runs did you set a value for COLLISION.

This is an example of giving COLLISION a value first (though you're more likely to see the shorter form if (place_meeting(x, y, obj_wall) {):

var COLLISION = place_meeting(x, y, obj_wall);
if (COLLISION) {

 

[Anhorakk]

Alright thank you very much! As i said in the comments, i am new to the domain so of course i do not understand everything when you speak with some specific terms. Also i am a French Canadian so yea, i won't understand all the terms but i understand most of them. On that note, i thank you very much for your help, and have a good time!