Part 17

Source/Engine/Font.swift

@@ -0,0 +1,12 @@
+//
+//  Font.swift
+//  Engine
+//
+//  Created by Nick Lockwood on 21/04/2020.
+//  Copyright © 2020 Nick Lockwood. All rights reserved.
+//
+
+public struct Font: Decodable {
+    public let texture: Texture
+    public let characters: [String]
+}

Source/Engine/Game.swift

@@ -0,0 +1,78 @@
+//
+//  Game.swift
+//  Engine
+//
+//  Created by Nick Lockwood on 07/10/2019.
+//  Copyright © 2019 Nick Lockwood. All rights reserved.
+//
+
+public protocol GameDelegate: AnyObject {
+    func playSound(_ sound: Sound)
+    func clearSounds()
+}
+
+public enum GameState {
+    case title
+    case starting
+    case playing
+}
+
+public struct Game {
+    public weak var delegate: GameDelegate?
+    public let levels: [Tilemap]
+    public private(set) var world: World
+    public private(set) var state: GameState
+    public private(set) var transition: Effect?
+    public let font: Font
+    public var titleText = "TAP TO START"
+
+    public init(levels: [Tilemap], font: Font) {
+        self.state = .title
+        self.levels = levels
+        self.world = World(map: levels[0])
+        self.font = font
+    }
+}
+
+public extension Game {
+    var hud: HUD {
+        return HUD(player: world.player, font: font)
+    }
+
+    mutating func update(timeStep: Double, input: Input) {
+        guard let delegate = delegate else {
+            return
+        }
+
+        // Update transition
+        if var effect = transition {
+            effect.time += timeStep
+            transition = effect
+        }
+
+        // Update state
+        switch state {
+        case .title:
+            if input.isFiring {
+                transition = Effect(type: .fadeOut, color: .black, duration: 0.5)
+                state = .starting
+            }
+        case .starting:
+            if transition?.isCompleted == true {
+                transition = Effect(type: .fadeIn, color: .black, duration: 0.5)
+                state = .playing
+            }
+        case .playing:
+            if let action = world.update(timeStep: timeStep, input: input) {
+                switch action {
+                case .loadLevel(let index):
+                    let index = index % levels.count
+                    world.setLevel(levels[index])
+                    delegate.clearSounds()
+                case .playSounds(let sounds):
+                    sounds.forEach(delegate.playSound)
+                }
+            }
+        }
+    }
+}

Source/Engine/HUD.swift

@@ -0,0 +1,33 @@
+//
+//  HUD.swift
+//  Engine
+//
+//  Created by Nick Lockwood on 19/04/2020.
+//  Copyright © 2020 Nick Lockwood. All rights reserved.
+//
+
+public struct HUD {
+    public let healthString: String
+    public let healthTint: Color
+    public let ammoString: String
+    public let playerWeapon: Texture
+    public let weaponIcon: Texture
+    public let font: Font
+
+    public init(player: Player, font: Font) {
+        let health = Int(max(0, player.health))
+        switch health {
+        case ...10:
+            self.healthTint = .red
+        case 10 ... 30:
+            self.healthTint = .yellow
+        default:
+            self.healthTint = .green
+        }
+        self.healthString = String(health)
+        self.ammoString = String(Int(max(0, min(99, player.ammo))))
+        self.playerWeapon = player.animation.texture
+        self.weaponIcon = player.weapon.attributes.hudIcon
+        self.font = font
+    }
+}

Source/Engine/Text.swift

@@ -0,0 +1,44 @@
+//
+//  Text.swift
+//  Engine
+//
+//  Created by Nick Lockwood on 21/04/2020.
+//  Copyright © 2020 Nick Lockwood. All rights reserved.
+//
+
+public struct TextStyle {
+    public let color: Color
+    public let shadowColor: Color
+    public let shadowOffset: Vector
+
+    public init(color: Color, shadowColor: Color) {
+        self.color = color
+        self.shadowColor = shadowColor
+        self.shadowOffset = Vector(x: 0, y: 1)
+    }
+}
+
+public extension TextStyle {
+    static let green = TextStyle(
+        color: .green,
+        shadowColor: Color(r: 55, g: 148, b: 110)
+    )
+    static let yellow = TextStyle(
+        color: .yellow,
+        shadowColor: Color(r: 223, g: 113, b: 38)
+    )
+    static let red = TextStyle(
+        color: .red,
+        shadowColor: Color(r: 172, g: 50, b: 50)
+    )
+    static let white = TextStyle(
+        color: .white,
+        shadowColor: Color(r: 34, g: 32, b: 52)
+    )
+}
+
+public struct Text {
+    public let font: Font
+    public let style: TextStyle
+    public let text: String
+}

Source/Engine/Texture.swift

@@ -6,7 +6,7 @@
 //  Copyright © 2019 Nick Lockwood. All rights reserved.
 //
 
-public enum Texture: String, CaseIterable {
+public enum Texture: String, CaseIterable, Decodable {
     case wall, wall2
     case crackWall, crackWall2
     case slimeWall, slimeWall2
@@ -32,4 +32,5 @@ public enum Texture: String, CaseIterable {
     case healthIcon
     case pistolIcon, shotgunIcon
     case font
+    case titleBackground, titleLogo
 }