[Questions] %*@)ing Events: how do they work?

[ShadowDragon868]

The events system in this game is ridiculously obtuse, and I couldn't find any useful guides.

Of course, I'm also painfully exhausted, but anyway.

Say I wanted an event to fire once and only once, after the game started. How would I go about making it check every race to see if they had a specific trait, and if they did, adding another specific trait?

Or, say I wanted to make it fire for everybody, after they research a specific tech, and have it then add another tech to the "always drawn, has a small % already researched" list at the bottom of the tech tree, like if they had reverse-engineered something. Would that be possible, too?

 

[LogicSequence]

Say I wanted an event to fire once and only once, after the game started. How would I go about making it check every race to see if they had a specific trait, and if they did, adding another specific trait?

Can't write everything for everyone, but since the first was easy:

event = {
    id = my_event.1
    hide_window = yes
    is_triggered_only = yes
    fire_only_once = yes

    immediate = {
        every_country = {
            limit = { has_trait = "trait_to_check" }
            add_trait = trait_to_add
        }
    }
}

And fire it from on_actions with:

on_game_start = {
    events = {
        my_event.1
    }
}

But you should look through other mods and the default game files and you can pick up the event coding fairly easily.