Migration to capital event

[unmerged(61237)]

Ave,

In my game as Rome (VV 2.2), I played with hyper-aggressive colonization. After 150 years or so, most of my Italian cities were big (50+) and rich. However, the eternal Rome itself was poor and little more than a colony (8-10) because each colonization took from its population.

As the capital of an empire should also be one of its biggest and richest cities, there could be a counterbalancing event to this capital decay, basically moving people from other big cities to the capital. If this kind of event does not exist yet, I might implement it at some point.

 

[Cheexsta]

Indeed, I've noticed this as well. It's particularly bad when you're playing as a country that doesn't have the crazy populations of Rome.

It seems like a pretty simple task to create an event for this. Here's something I knocked up in a few minutes:

province_event = {
	id = 9999999
	
	trigger = {
		is_capital = yes
		NOT = { population = 20 }
		any_neighbor_province = { 
			population = 20 
			owned_by = THIS
		}
	}
	
	mean_time_to_happen = {
		months = 120
		
		modifier = {
			factor = 0.5
			NOT = { population = 15 }
		}
		
		modifier = { 
			factor = 0.5
			NOT = { population = 10 }
		}
		
		modifier = { 
			factor = 0.1
			NOT = { population = 5 }
		}
	}
	
	title = "Capitol Attraction"
	desc = "As we establish more colonies on our borders, men and women leave the capital and leave behind them opportunity for others."
	
	option = {
		name = "Encourage people to move to the city"
		country = { 
			any_owned = {
				limit = {
					any_neighbor_province = {
						owned_by = THIS
						is_capital = yes
					}
					owned_by = THIS
					population = 20
				}
				population = -2
				capital_scope = { population = 2 }
			}
		}
	}
}

Basically, it means that if your capital has less than 20 pop and any of your provinces neighboring the capital has 20 or more pop, then the event has a chance to fire. On average, it should take 10 years; if you have less than 15 pop in your capital, it should take 5 years; if you have less than 10 pop in your capital, it should take 2.5 years; if you have less than 5 pop in your capital, it should take about 3 months. Give or take.

Give it a go and let me know if it works. It is savegame compatible.

 

[unmerged(61237)]

Thanks, that's what I was looking for. However, the event part was not functioning, I needed to change it to:

	option = {
		name = "Encourage people to move to the city"
		owner = {
			random_owned = {
				limit = {
					is_capital = no
					population = 20
				}
				population = -2
			}
		}
		population = 2
	}

I removed the neighbor condition since I want the capital to draw population from all over the world. I'll still test and tune the trigger conditions and frequencies, visioning a more aggressive event which can raise the capital population even up to 50-100 with a large enough empire.

 

[unmerged(61237)]

After some tuning, here is the "final" event:

province_event = {
	id = 1029999
	
	trigger = {
		is_capital = yes
		owner = { num_of_cities = 10 }
		NOT = { population = 120 }
		owner = { 
			any_province = {
				is_capital = no
				population = 30
			}
		}
	}
	
	mean_time_to_happen = {
		months = 48

		modifier = {
			factor = 1.4
			population = 90
		}

		modifier = {
			factor = 1.4
			population = 70
		}

		modifier = {
			factor = 0.7
			NOT = { population = 50 }
		}

		modifier = {
			factor = 0.7
			NOT = { population = 30 }
		}
		
		modifier = {
			factor = 0.5
			NOT = { population = 15 }
		}
		
		modifier = { 
			factor = 0.5
			NOT = { population = 10 }
		}
		
		modifier = { 
			factor = 0.1
			NOT = { population = 5 }
		}

		modifier = {
			factor = 1.6
			NOT = { owner = { num_of_cities = 15 } }
		}

		modifier = {
			factor = 1.6
			NOT = { owner = { num_of_cities = 25 } }
		}

		modifier = {
			factor = 1.6
			NOT = { owner = { num_of_cities = 40 } }
		}

		modifier = {
			factor = 0.7
			owner = { num_of_cities = 65 }
		}

		modifier = {
			factor = 0.7
			owner = { num_of_cities = 100 }
		}
	}
	
	title = "Migration to the capital"
	desc = "Our capital is the center of administration, culture, economy and learning
. It constantly attracts provincial people who look for better 

opportunities in life."

	option = {
		name = "Encourage people to move to the city"
		owner = {
			random_owned = {
				limit = {
					is_capital = no
					population = 30
				}
				population = -4
			}
		}
		population = 4
	}
}

For small empires (10-15 cities) and small capitals (<15), this event gives 4 immigrants each 8 years (worth 1 colonization each 4 years), at least as long as there are enough large cities to supply population. For small empires and large capitals (90, think of Alexandria), 4 immigrants will be coming each 32 years. For Imperium size countries, this event should keep the capital population at 50+ (or 100+ for larger Imperiums) no matter the colonization rate.

 

[Hardradi]

Nice work. This should be in every mod.

 

[crazymonky123]

This is great I just pasted it into my mish-mash of all the great mods around. Now maybe I can turn Pella into the greatest city in the world. Thanks for this.