62 lines
1.7 KiB
Swift
62 lines
1.7 KiB
Swift
//
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// Nexus+Entity.swift
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// FirebladeECS
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//
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// Created by Christian Treffs on 13.10.17.
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//
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extension Nexus {
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private func nextEntityIdx() -> EntityIndex {
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guard let nextReused: EntityIdentifier = freeEntities.popLast() else {
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return entityStorage.count
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}
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return nextReused.index
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}
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// swiftlint:disable function_default_parameter_at_end
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@discardableResult
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public func create(entity name: String? = nil, with assignedComponents: Component...) -> Entity {
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let newEntityIndex: EntityIndex = nextEntityIdx()
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let newEntityIdentifier: EntityIdentifier = newEntityIndex.identifier
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let newEntity = Entity(nexus: self, id: newEntityIdentifier, name: name)
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entityStorage.insert(newEntity, at: newEntityIndex)
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notify(EntityCreated(entityId: newEntityIdentifier))
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assignedComponents.forEach { newEntity.assign($0) }
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return newEntity
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}
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// swiftlint:enable function_default_parameter_at_end
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/// Number of entities in nexus.
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public var numEntities: Int {
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return entityStorage.count
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}
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public func exists(entity entityId: EntityIdentifier) -> Bool {
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return entityStorage.contains(entityId.index)
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}
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public func get(entity entityId: EntityIdentifier) -> Entity? {
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return entityStorage.get(at: entityId.index)
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}
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@discardableResult
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public func destroy(entity: Entity) -> Bool {
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let entityId: EntityIdentifier = entity.identifier
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let entityIdx: EntityIndex = entityId.index
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guard entityStorage.remove(at: entityIdx) != nil else {
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report("EntityRemove failure: no entity \(entityId) to remove")
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return false
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}
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if clear(componentes: entityId) {
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update(familyMembership: entityId)
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}
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freeEntities.append(entityId)
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notify(EntityDestroyed(entityId: entityId))
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return true
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}
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}
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