92 lines
3.0 KiB
Swift
92 lines
3.0 KiB
Swift
//
|
|
// Nexus+ComponentsBuilder.swift
|
|
// FirebladeECS
|
|
//
|
|
// Created by Christian Treffs on 30.07.20.
|
|
//
|
|
|
|
@_functionBuilder
|
|
public enum ComponentsBuilderPreview { }
|
|
public typealias ComponentsBuilder = ComponentsBuilderPreview
|
|
|
|
extension ComponentsBuilder {
|
|
public static func buildBlock(_ components: Component...) -> [Component] {
|
|
components
|
|
}
|
|
|
|
public struct Context {
|
|
/// The index of the newly created entity.
|
|
///
|
|
/// This is **NOT** equal to the entity identifier.
|
|
public let index: Int
|
|
}
|
|
}
|
|
|
|
extension Nexus {
|
|
/// Create an entity assigning one component.
|
|
///
|
|
/// Usage:
|
|
/// ```
|
|
/// let newEntity = nexus.createEntity {
|
|
/// Position(x: 1, y: 2)
|
|
/// }
|
|
/// ```
|
|
/// - Parameter builder: The component builder.
|
|
/// - Returns: The newly created entity with the provided component assigned.
|
|
@discardableResult
|
|
public func createEntity(@ComponentsBuilder using builder: () -> Component) -> Entity {
|
|
self.createEntity(with: builder())
|
|
}
|
|
|
|
/// Create an entity assigning multiple components.
|
|
///
|
|
/// Usage:
|
|
/// ```
|
|
/// let newEntity = nexus.createEntity {
|
|
/// Position(x: 1, y: 2)
|
|
/// Name(name: "Some name")
|
|
/// }
|
|
/// ```
|
|
/// - Parameter builder: The component builder.
|
|
/// - Returns: The newly created entity with the provided components assigned.
|
|
@discardableResult
|
|
public func createEntity(@ComponentsBuilder using builder: () -> [Component]) -> Entity {
|
|
self.createEntity(with: builder())
|
|
}
|
|
|
|
/// Create multiple entities assigning one component each.
|
|
///
|
|
/// Usage:
|
|
/// ```
|
|
/// let newEntities = nexus.createEntities(count: 100) { ctx in
|
|
/// Velocity(a: Float(ctx.index))
|
|
/// }
|
|
/// ```
|
|
/// - Parameters:
|
|
/// - count: The count of entities to create.
|
|
/// - builder: The component builder providing context.
|
|
/// - Returns: The newly created entities with the provided component assigned.
|
|
@discardableResult
|
|
public func createEntities(count: Int, @ComponentsBuilder using builder: (ComponentsBuilder.Context) -> Component) -> [Entity] {
|
|
(0..<count).map { self.createEntity(with: builder(ComponentsBuilder.Context(index: $0))) }
|
|
}
|
|
|
|
/// Create multiple entities assigning multiple components each.
|
|
///
|
|
/// Usage:
|
|
/// ```
|
|
/// let newEntities = nexus.createEntities(count: 100) { ctx in
|
|
/// Position(x: ctx.index, y: ctx.index)
|
|
/// Name(name: "\(ctx.index)")
|
|
/// }
|
|
/// ```
|
|
/// - Parameters:
|
|
/// - count: The count of entities to create.
|
|
/// - builder: The component builder providing context.
|
|
/// - Returns: The newly created entities with the provided components assigned.
|
|
@discardableResult
|
|
public func createEntities(count: Int, @ComponentsBuilder using builder: (ComponentsBuilder.Context) -> [Component]) -> [Entity] {
|
|
(0..<count).map { self.createEntity(with: builder(ComponentsBuilder.Context(index: $0))) }
|
|
}
|
|
}
|