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Kotlin pour le développement d’un jeu avec libGDX Avantages & inconvénients

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David Wursteisen

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John Carmack

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❤

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PRODUCTIVITYYYYYYYY

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Core iOS GWT Android Desktop

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Core Android Desktop

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class HelloWorld : ScreenAdapter() { override fun show() { } override fun render(delta: Float) { } } Initialisation de l’écran de jeu Rendu de l’écran de jeu

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class HelloWorld : ScreenAdapter() { var batch: SpriteBatch? override fun show() { batch = SpriteBatch() } override fun render(delta: Float) { batch!!.begin() // ... batch!!.end() } }

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class HelloWorld : ScreenAdapter() { var batch: SpriteBatch? override fun show() { batch = SpriteBatch() } override fun render(delta: Float) { batch!!.begin() // ... batch!!.end() } }

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class HelloWorld : ScreenAdapter() { lateinit var batch: SpriteBatch override fun show() { batch = SpriteBatch() } override fun render(delta: Float) { batch.begin() // ... batch.end() } }

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class HelloWorld : ScreenAdapter() { lateinit var batch: SpriteBatch override fun show() { batch = SpriteBatch() } override fun render(delta: Float) { batch.begin() // ... batch.end() } }

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fun String.toColor(): Color = Color.valueOf(this) val background = « 0089d5".toColor() fun ShapeRenderer.rect(pos: Vector2, size: Vector2) { this.rect(pos.x, pos.y, size.x, size.y) } batch.rect(pos1, pos2)

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fun String.toColor(): Color = Color.valueOf(this) val background = « 0089d5".toColor() fun ShapeRenderer.rect(pos: Vector2, size: Vector2) { this.rect(pos.x, pos.y, size.x, size.y) } batch.rect(pos1, pos2) Méthode d’extension = étendre une API à son besoin

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Hexagonal Architecture ?

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object EntityFactory { fun player(engine: PooledEngine, assets: AssetManager): Unit { // … } Couplage ! Couplage !

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const val TOUCH_DOWN = 1 const val TOUCH_UP = 2 const val TOUCH_MOVE = 3 Compile-Time Constants Properties the value of which is known at compile time can be marked as compile time constants using the const modifier. Such properties need to fulfil the following requirements: Top-level or member of an object Initialized with a value of type String or a primitive type No custom getter

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private void readMeasureHeader(InputStream is, int measureIndex) throws IOException { int header = helper.readUnsignedByte(is); boolean repeatStart = ((header & ParserHelper.BITMASK_3) != 0); boolean doubleBar = ((header & ParserHelper.BITMASK_8) != 0); int numerator = 0; if ((header & ParserHelper.BITMASK_1) != 0) { numerator = helper.readByte(is); } int denominator = 0; if ((header & ParserHelper.BITMASK_2) != 0) { denominator = helper.readByte(is); } }

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private void readMeasureHeader(InputStream is, int measureIndex) throws IOException { int header = helper.readUnsignedByte(is); boolean repeatStart = ((header & ParserHelper.BITMASK_3) != 0); boolean doubleBar = ((header & ParserHelper.BITMASK_8) != 0); int numerator = 0; if ((header & ParserHelper.BITMASK_1) != 0) { numerator = helper.readByte(is); } int denominator = 0; if ((header & ParserHelper.BITMASK_2) != 0) { denominator = helper.readByte(is); } }

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TOUCH_DOWN shl 3 TOUCH_DOWN and 2 TOUCH_DOWN << 3 TOUCH_DOWN & 2

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Direction Position

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Vector2(3f, 5f).set(entity[cameraData].direction) .scl(5f) .add(entity[position].value) .add(halfX, halfY val v1 = Vector2(3f, 5f) + Vector2(4f, 2f) v2 = v1 * 5f

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Vector2(3f, 5f).set(entity[cameraData].direction) .scl(5f) .add(entity[position].value) .add(halfX, halfY val v1 = Vector2(3f, 5f) + Vector2(4f, 2f) v2 = v1 * 5f Surcharge d’opérateur (add) Surcharge d’opérateur (scl)

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engine.addEntity({ e -> val left = spriteDef.slices("left") val leftRegion = left.textureRegion(assets["sheets/pico8/keyboard.png"]) e.add(Controller()) e.add(Position(42 v2 26)) e.add(Size(16 v2 16)) e.add(EntityRender(texture = leftRegion)) e.add(ButtonComponent(ButtonSystem.LEFT)) e.add(StateComponent()) }) Vector2

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engine.addEntity({ e -> val left = spriteDef.slices("left") val leftRegion = left.textureRegion(assets["sheets/pico8/keyboard.png"]) e.add(Controller()) e.add(Position(42 v2 26)) e.add(Size(16 v2 16)) e.add(EntityRender(texture = leftRegion)) e.add(ButtonComponent(ButtonSystem.LEFT)) e.add(StateComponent()) }) infix fun Int.v2(that: Int): Vector2 = Vector2(this.toFloat(), that.toFloat())

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Position Couleur Joueur Etat

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val player = Entity() player.add(Player())) player.add(Position(100 v2 100)) player.add(ColorSplash(Color.GREEN)) player.add(StateComponent()) Position Couleur Joueur Etat

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ComponentMapper pm = ComponentMapper.getFor(PositionComponent.class); ComponentMapper vm = ComponentMapper.getFor(VelocityComponent.class); ... PositionComponent position = pm.get(entity); VelocityComponent velocity = vm.get(entity); Extracteur Extraction

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inline fun EntitySystem.get(): ComponentMapper = ComponentMapper.getFor(T::class.java) private val move: ComponentMapper = ComponentMapper.getFor(TurnMove::class.java) Extracteur

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inline fun EntitySystem.get(): ComponentMapper = ComponentMapper.getFor(T::class.java) private val move: ComponentMapper = ComponentMapper.getFor(TurnMove::class.java) Inline + reified

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inline fun EntitySystem.get(): ComponentMapper = ComponentMapper.getFor(T::class.java) private val move: ComponentMapper = get()

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private val move: ComponentMapper = get() private val position: ComponentMapper = get() private val state: ComponentMapper = get() private val direction: ComponentMapper = get()

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PositionComponent position = pm.get(entity); Extraction

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val position: Position = pm.get(entity)

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val position: Position = entity.get(pm)

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val position: Position = entity[pm]

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entity[move].turn(entity[direction].value) entity[state].time = 0f entity[animated].animation = animation["dragon_move"] Direction Etat …

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public void render(float delta) {
 movePlayer(delta);
 moveEnemies(delta);
 moveWorld(delta);
 
 renderWorld();
 renderEnemies();
 renderPlayer();
 }

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public void render(float delta) {
 movePlayer(delta);
 moveEnemies(delta);
 moveWorld(delta);
 
 renderWorld();
 renderEnemies();
 renderPlayer();
 } 60x
 secondes

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Garbage Collector Garbage Collector Garbage Collector Garbage Collecto arbage C Garbage STOP THE WORLD

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altLayers = map.layers .mapIndexed { index, layer -> index to layer } .filter { it.second.name.startsWith("alt_") } .map { it.first } .toIntArray() mutableList !

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val a = Array(5, { "" }) val b = Array() Différence ? Array libGDX

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import com.badlogic.gdx.utils.Array as GdxArray val a = Array(5, { "" }) val b = GdxArray()

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interface EventListener { fun onEvent(event: Event, eventData: EventData) } fun register(eventListener: EventListener, vararg events: Event) { events.forEach { val lst = listeners[it] if (lst == null) { listeners.put(it, listOf(eventListener)) } else { listeners.put(it, lst + eventListener) } } }

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interface EventListener { fun onEvent(event: Event, eventData: EventData) } fun register(eventListener: EventListener, vararg events: Event) { events.forEach { val lst = listeners[it] if (lst == null) { listeners.put(it, listOf(eventListener)) } else { listeners.put(it, lst + eventListener) } } } Interface avec une méthode

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eventBus.register(object : EventListener { override fun onEvent(event: Event, eventData: EventData) { game.loadingScreen() } }, GameEvents.EVENT_GAME_MAIN_MENU) Class anonyme

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fun on(event: Int, block: Transition): OnState { var currentTransitions = parent.transitions[state] ?: emptyMap() currentTransitions += event to block parent.transitions += state to currentTransitions return this } Lambda

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startWith(WAIT) onState(WAIT).on(GameEvents.EVENT_COMPUTER_ALLOW_MOVE) { entity, event -> if (entity[dragon].currentTurn > 3) { entity[dragon].currentTurn = -1 go(FIRE, entity, event) } else { go(MOVE, entity, event) } } onState(FIRE).on(GameEvents.EVENT_DRAGON_FIRE_BALL) { entity, event -> go(MOVE, entity, event) } Lambda

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startWith(WAIT) onState(WAIT).on(GameEvents.EVENT_COMPUTER_ALLOW_MOVE) { entity, event -> if (entity[dragon].currentTurn > 3) { entity[dragon].currentTurn = -1 go(FIRE, entity, event) } else { go(MOVE, entity, event) } } onState(FIRE).on(GameEvents.EVENT_DRAGON_FIRE_BALL) { entity, event -> go(MOVE, entity, event) } Etat Event Transition

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❤

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On reste en contact ? @dwursteisen

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https://goo.gl/4UcQYx En attendant… téléchargez 
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