adrien
c49899a2fd
Server-authoritative Godot 4.6 strategy game. Includes the headless WebSocket game server, the browser client, and Nix packaging (server and web-export derivations plus a NixOS module) for deployment.
75 lines
2.7 KiB
GDScript
75 lines
2.7 KiB
GDScript
class_name ProtoBuilding
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extends Resource
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## Template for a city building. Concrete instances live under
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## res://data/buildings and are edited in the inspector.
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##
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## Unlike Civilisation's one-off buildings, these can be levelled up and down.
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## The build cost and the upkeep grow exponentially with the level (alpha^level)
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## while the effects grow linearly or sublinear (see BuildingEffect), so pushing
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## a building too high yields diminishing returns for an accelerating bill.
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##
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## The build cost is based on the owner's GDP: a flat base_cost plus a fraction
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## of GDP, both multiplied by cost_alpha^level, so it stays meaningful as the
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## economy grows.
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## Effect stat keys consumed by GameState.
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const EFFECT_GDP := "gdp"
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const EFFECT_RESEARCH := "research"
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const EFFECT_CULTURE := "culture"
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const EFFECT_BUDGET_INCOME := "budget_income"
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@export var name : String
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@export_multiline var description : String
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## Levels the building can reach; 0 means "not built".
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@export var max_level : int = 10
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## Flat part of the build cost, in budget currency.
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@export var base_cost : float = 0.0
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## Fraction of the owner's GDP added to the build cost.
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@export var cost_gdp_fraction : float = 0.0
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## Exponential cost growth per level (alpha in alpha^level).
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@export_range(1.0, 5.0) var cost_alpha : float = 1.5
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## Flat part of the hourly upkeep, in budget currency.
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@export var base_upkeep : float = 0.0
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## Fraction of the owner's GDP charged as hourly upkeep.
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@export var upkeep_gdp_fraction : float = 0.0
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## Exponential upkeep growth per level (alpha in alpha^level).
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@export_range(1.0, 5.0) var upkeep_alpha : float = 1.5
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## Fraction of the removed level's build cost refunded when downgrading.
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@export_range(0.0, 1.0) var refund_fraction : float = 0.5
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@export var effects : Array[BuildingEffect] = []
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## Budget cost to raise the building from `level` to `level + 1`.
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func build_cost(gdp: float, level: int) -> float:
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return (base_cost + cost_gdp_fraction * maxf(gdp, 0.0)) * pow(cost_alpha, float(maxi(level, 0)))
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## Budget refunded when lowering the building from `level` to `level - 1`.
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func refund(gdp: float, level: int) -> float:
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return build_cost(gdp, level - 1) * refund_fraction
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## Budget upkeep per game hour while the building sits at `level`.
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func upkeep(gdp: float, level: int) -> float:
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if level <= 0:
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return 0.0
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var base := base_upkeep + upkeep_gdp_fraction * maxf(gdp, 0.0)
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return base * pow(upkeep_alpha, float(level))
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## Total contribution to `stat` at `level`, summed over every effect that feeds
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## it. Returns 0.0 for an unknown stat or an unbuilt building.
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func effect_value(stat: String, level: int) -> float:
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var total := 0.0
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for effect in effects:
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if effect.stat == stat:
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total += effect.value_at(level)
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return total
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