andre-la / rotor-nelua Goto Github PK
View Code? Open in Web Editor NEWECS library written in Nelua
License: MIT License
ECS library written in Nelua
License: MIT License
Note:
__atindex
will deprecatemget
.
This eases development with derived entities.
Usage example:
local rotor_concepts = require 'rotor.concepts'
local SpriteEntity = @entity(@record{
entity_data: EntityData,
sprite: Sprite,
painter: Painter,
})
local an_sprite_entity_ptr = #[rotor_concepts.value.entity_ptr_compatible_with(SpriteEntity.value)]#
local Inputs = @record{ --[[...]] }
function SpriteEntity.derived_init(sprite_entity: an_sprite_entity_ptr, inputs: Inputs)
sprite_entity.entity_data = {
id = inputs.sprite.id,
mask = inputs.sprite.mask,
}
-- ...
end
If I push an entity and then need to make some configuration on it, then something like this is needed:
local ok, id = Enemy.storage:push(Enemy.Entity.init(pos))
check(ok, 'error: enemy could not be pushed to storage')
local ok, enemy = Enemy.storage:mget(id)
check(ok, 'error: enemy could not be got from storage')
enemy.collider.entity_id = id
If push
also returned a reference to the pushed entry, then this nicer code would be possible:
local ok, id, enemy = Enemy.storage:push(Enemy.Entity.init(pos))
check(ok, 'error: enemy could not be pushed to storage')
enemy.collider.entity_id = id
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