Destroying other instances from a "main object"?

[ColeusSanctus]

Hey guys,
i have a problem with destroying a specific instance.
I create an object, called object_enemy_2 and this object creates other objects (light, gun and engine).
The enemy has 10 health and when it has a collision with the bullet from the player, health becomes -1 (relativ).
When it drops to 0 object_enemy_2 gets destroyed but then this error appears.


I understand the problem:
The light, gun and engine have step-events where they jump to a point to stay at the enemy_2.
But when enemy_2 doesnt exist anymore they cannot jump, so the error appears.
So how can prevent this and can destroy the three other object if the "main object" gets killed?

I hope somebody can give me a hint

Greetings
Simon

PS: Sorry for my english

 

[Wayfarer]

In the "Destroy" event of the "main object" use something like:

with (destroyThisInstance1) instance_destroy(); // instance #1
with (destroyThisInstance2) instance_destroy(); // instance #2
with (destroyThisInstance3) instance_destroy(); // instance #3

Replace "destroyThisInstance1", "destroyThisInstance2" and "destroyThisInstance3" with the three object names

The "Destroy" event runs when an instance is destroyed.

Edit:
Oh, I see you're using Drag and Drop. In that case, still go to the "Destroy" event, and you should be able to add some kind of "Destroy Instance" icon/thing (not sure how it works in GMS2). Add one of these for each instance.

 

[ColeusSanctus]

Hey,
thanks for your help!
I just added "execude code" and wrote your lines and it worked !

 

[ColeusSanctus]

Well, now i have another problem....
If i have two "mother objects" and one gets destroyed, the other three object of the second "mother object" also gets destroyed...
How can i specificate this?

 

[sp202]

When creating the subsidiary objects you need to store the id they return and use that id in instance_destroy().

 

[csanyk]

Somewhere (probably in Create Event) for enemy_2, you need to store the id of the light, gun, and engine instances that belong to the enemy_2. Then, in the enemy_2 Destroy Event, you can destroy the light, gun, and engine instances by means of a with (id) instance_destroy() (GMS1.x) or instance_destroy(id) (GMS2.x).

Alternately, if you don't want to destroy those instances (for example, if the enemy should drop his gun as a pickup for the player) you could always have instance_exists() checks to see if the enemy_2 instance that was holding the gun still exists.

 

[ColeusSanctus]

Hey,
so i got your idea but i am to stupid for programming it ^^.
I always get the error, that the id variable isnt set befor reading it :/
Any idea? Maybe also for D&D?
Would be great
Sry for the stupid questions, but i am new to this

 

[csanyk]

Hey,
so i got your idea but i am to stupid for programming it ^^.
I always get the error, that the id variable isnt set befor reading it :/
Any idea? Maybe also for D&D?
Would be great
Sry for the stupid questions, but i am new to this

I haven't used DnD in such a long time, I'm not sure how easily it can be done with DnD commands. But the GML would look something like:

///Enemy_2 Create Event:

//Create instances of the gun, light, and engine for the enemy_2

gun = instance_create(x, y, obj_gun);
light = instance_create(x, y, obj_light);
engine = instance_create(x, y, obj_engine);

///Enemy_2 Step Event:

//Keep the gun, light, and engine in place of the enemy_2

gun.x = x; gun.y = y;
light.x = x; light.y = y;
engine.x = x; engine.y = y;

///Enemy_2 Destroy Event:

//Clean up the gun, light, and engine of the enemy_2

with (gun) instance_destroy();
with (light) instance_destroy();
with (engine) instance_destroy();

 

[ColeusSanctus]

I haven't used DnD in such a long time, I'm not sure how easily it can be done with DnD commands. But the GML would look something like:

///Enemy_2 Create Event:

//Create instances of the gun, light, and engine for the enemy_2

gun = instance_create(x, y, obj_gun);
light = instance_create(x, y, obj_light);
engine = instance_create(x, y, obj_engine);

///Enemy_2 Step Event:

//Keep the gun, light, and engine in place of the enemy_2

gun.x = x; gun.y = y;
light.x = x; light.y = y;
engine.x = x; engine.y = y;

///Enemy_2 Destroy Event:

//Clean up the gun, light, and engine of the enemy_2

with (gun) instance_destroy();
with (light) instance_destroy();
with (engine) instance_destroy();

Hi,
thank you for your fast help!
Everything is working now and maybe i should used to get into the GML ^^