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Update example with relations

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Ukendio 2024-05-10 17:59:26 +02:00
parent 35f92a79d0
commit 4bd44693e8
1 changed files with 14 additions and 8 deletions
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README.md
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@ -19,15 +19,18 @@ jecs is a stupidly fast Entity Component System (ECS).
### Example
```lua
local world = Jecs.World.new()
local Health = world:component()
local Damage = world:component()
local Position = world:component()
local world = World.new()
local player = world:entity()
local opponent = world:entity()
local Health = world:component()
local Position = world:component()
-- Notice how components can just be entities as well?
-- It allows you to model relationships easily!
local Damage = world:entity()
local DamagedBy = world:entity()
world:set(player, Health, 100)
world:set(player, Damage, 8)
world:set(player, Position, Vector3.new(0, 5, 0))
@ -38,17 +41,20 @@ world:set(opponent, Position, Vector3.new(0, 5, 3))
for playerId, playerPosition, health in world:query(Position, Health) do
local totalDamage = 0
for _, opponentPosition, damage in world:query(Position, Damage) do
for opponentId, opponentPosition, damage in world:query(Position, Damage) do
if (playerPosition - opponentPosition).Magnitude < 5 then
totalDamage += damage
end
world:set(playerId, ECS_PAIR(DamagedBy, opponentId), totalDamage)
end
end
world:set(playerId, Health, health - totalDamage)
-- Gets the damage inflicted by our specific opponent!
for playerId, health, inflicted in world:query(Health, ECS_PAIR(DamagedBy, opponent)) do
world:set(playerId, health - inflicted)
end
assert(world:get(playerId, Health) == 79)
assert(world:get(opponentId, Health) == 92)
```
125 archetypes, 4 random components queried.