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Build a game using libGDX and Kotlin Build a game using libGDX and Kotlin Build a game using libGDX and Kotlin Build a game using libGDX and Kotlin Beat the High score Beat the High score Build a game using libGDX and Kotlin

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-Gilles Allain In a farm… far, far away…

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-Gilles Allain a fox appears in the darkness of the night.

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-Gilles Allain In a mighty move, he stole all the chickens of the farm...

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-Gilles Allain those chickens were our...friends.

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-Gilles Allain the same night, a lightning strikes you!

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-Gilles Allain ...this lightning has given you power to bring back... ...our friends!

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Let's help him !
 (by making a game)

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David Wursteisen

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John Carmack

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Game 
 development Kotlin libGDX

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You, at the end of 
 this conference Game 
 development Kotlin libGDX

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Game Development?

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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();
 }

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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
 seconds

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(0,0) x y

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Why libGDX?

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❤

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Pavel Quest Destroy Blocks Mirage Realms

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Hair Dash - http://cleancutgames.com/

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Bob & Prickle - http://www.crealodegames.com/

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Let’s make a game!

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Core iOS GWT Android Desktop

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void render(float delta) { }

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fun render(delta: float) { }

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class HelloScreen : ScreenAdapter() { override fun render(delta: Float) { } }

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class HelloScreen : ScreenAdapter() { override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) } }

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class HelloScreen : ScreenAdapter() { private val shape = ShapeRenderer() override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) } }

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class HelloScreen : ScreenAdapter() { private val shape = ShapeRenderer() override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) shape.begin(ShapeRenderer.ShapeType.Filled) shape.end() } }

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class HelloScreen : ScreenAdapter() { private val shape = ShapeRenderer() override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) shape.begin(ShapeRenderer.ShapeType.Filled) shape.color = Color.RED shape.circle(0f, 0f, 20f) shape.end() } }

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class HelloScreen : ScreenAdapter() { override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) } }

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class HelloScreen : ScreenAdapter() { private val batch = SpriteBatch() override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) } }

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class HelloScreen : ScreenAdapter() { private val batch = SpriteBatch() private val texture = Texture("badlogic.jpg") override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) } }

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class HelloScreen : ScreenAdapter() { private val batch = SpriteBatch() private val texture = Texture("badlogic.jpg") override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() batch.end() } }

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class HelloScreen : ScreenAdapter() { private val batch = SpriteBatch() private val texture = Texture("badlogic.jpg") override fun render(delta: Float) { Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() batch.draw(texture, 0f, 0f) batch.end() } }

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Position = (0, 0) Position = (10, 0) Position = (0, -5) Position = (-10, 5)

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class MyScreen : ScreenAdapter() { private val batch = ShapeRenderer() private val position: Vector2 = Vector2(0f, 0f) override fun render(delta: Float) { position.add(0f, -0.5f) batch.begin(ShapeRenderer.ShapeType.Filled) batch.color = Color.CHARTREUSE batch.circle(position.x, position.y, radius) batch.end() } }

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class MyScreen : ScreenAdapter() { private val batch = ShapeRenderer() private val position: Vector2 = Vector2(0f, 0f) override fun render(delta: Float) { position.add(0f, -0.5f) batch.begin(ShapeRenderer.ShapeType.Filled) batch.color = Color.CHARTREUSE batch.circle(position.x, position.y, radius) batch.end() } }

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class MyScreen : ScreenAdapter() { private val batch = ShapeRenderer() private val position: Vector2 = Vector2(0f, 0f) override fun render(delta: Float) { position.add(0f, -0.5f) batch.begin(ShapeRenderer.ShapeType.Filled) batch.color = Color.CHARTREUSE batch.circle(position.x, position.y, radius) batch.end() } }

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class MyScreen : ScreenAdapter() { private val batch = ShapeRenderer() private val position: Vector2 = Vector2(0f, 0f) override fun render(delta: Float) { position.add(0f, -0.5f) batch.begin(ShapeRenderer.ShapeType.Filled) batch.color = Color.CHARTREUSE batch.circle(position.x, position.y, radius) batch.end() } }

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class MyScreen : ScreenAdapter() { private val batch = ShapeRenderer() private val position: Vector2 = Vector2(0f, 0f) override fun render(delta: Float) { position.add(0f, -0.5f) val (x, y) = position batch.begin(ShapeRenderer.ShapeType.Filled) batch.color = Color.CHARTREUSE batch.circle(x, y, radius) batch.end() } }

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/** * Operator function that allows to deconstruct this vector. * @return X component. */ operator fun Vector2.component1(): Float = this.x /** * Operator function that allows to deconstruct this vector. * @return Y component. */ operator fun Vector2.component2(): Float = this.y val vector = Vector2(45f, 50f) val (x, y) = vector

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/** * Operator function that allows to deconstruct this vector. * @return X component. */ operator fun Vector2.component1(): Float = this.x /** * Operator function that allows to deconstruct this vector. * @return Y component. */ operator fun Vector2.component2(): Float = this.y val (x, y) = Vector2(45f, 50f)

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val alpha = Math.abs(ball.x - raquet.x) val direction: Vector2 = Vector2(10f, 20f) direction.scl(1f, -1f) .scl(alpha) .nor() .rotate(306f) .add(10f, 20f)

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entity.add(Ball()) .add(Position(Vector2(-100f, -100f))) .add(Size(Vector2(8f, 9f))) .add(Offset(Vector2(4f, 4f)))

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entity.add(Ball()) .add(Position(Vector2(-100f, -100f))) .add(Size(Vector2(8f, 9f))) .add(Offset(Vector2(4f, 4f)))

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entity.add(Ball()) .add(Position(-100 v2 -100f)) .add(Size(8 v2 9)) .add(Offset(4 v2 4)) Create a 
 new Vector2 infix fun Number.v2(other: Number): Vector2 { return Vector2(this.toFloat(), other.toFloat()) }

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Collision engine

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Side Racket Ball

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val ball = Rectangle(68f, 64f, 5f, 5f) val player = Rectangle(64f, 64f, 100f, 10f) // the ball hit the player? player.overlaps(ball)

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val ball = Rectangle(68f, 64f, 5f, 5f) val player = Rectangle(64f, 64f, 100f, 10f) // the ball hit the player? player.overlaps(ball)

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val ball = Rectangle(68f, 64f, 5f, 5f) val player = Rectangle(64f, 64f, 100f, 10f) // the ball hit the player? player.overlaps(ball) (Simple AABB Engine)

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Box2D

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var world = World(Vector2(0, -10), true) // ... val bodyDef = BodyDef() // Set its world position bodyDef.position.set(position.x, position.y) bodyDef.type = BodyDef.BodyType.DynamicBody bodyDef.angle = 0f val body = world.createBody(bodyDef) val shape = CircleShape() shape.radius = 8f // 2. Create a FixtureDef, as usual. val fd = FixtureDef() fd.density = 1f fd.friction = 2f fd.shape = shape body.createFixture(fd) body.userData = Any // attach sprite data shape.dispose()

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var world = World(Vector2(0, -10), true) // ... val bodyDef = BodyDef() // Set its world position bodyDef.position.set(position.x, position.y) bodyDef.type = BodyDef.BodyType.DynamicBody bodyDef.angle = 0f val body = world.createBody(bodyDef) val shape = CircleShape() shape.radius = 8f // 2. Create a FixtureDef, as usual. val fd = FixtureDef() fd.density = 1f fd.friction = 2f fd.shape = shape body.createFixture(fd) body.userData = Any // attach sprite data shape.dispose() Gravity

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var world = World(Vector2(0, -10), true) // ... val bodyDef = BodyDef() // Set its world position bodyDef.position.set(position.x, position.y) bodyDef.type = BodyDef.BodyType.DynamicBody bodyDef.angle = 0f val body = world.createBody(bodyDef) val shape = CircleShape() shape.radius = 8f // 2. Create a FixtureDef, as usual. val fd = FixtureDef() fd.density = 1f fd.friction = 2f fd.shape = shape body.createFixture(fd) body.userData = Any // attach sprite data shape.dispose() Configuration of the « thing »

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var world = World(Vector2(0, -10), true) // ... val bodyDef = BodyDef() // Set its world position bodyDef.position.set(position.x, position.y) bodyDef.type = BodyDef.BodyType.DynamicBody bodyDef.angle = 0f val body = world.createBody(bodyDef) val shape = CircleShape() shape.radius = 8f // 2. Create a FixtureDef, as usual. val fd = FixtureDef() fd.density = 1f fd.friction = 2f fd.shape = shape body.createFixture(fd) body.userData = Any // attach sprite data shape.dispose() Attach data from your world to Box2D world

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var world = World(Vector2(0, -10), true) // ... val bodyDef = BodyDef() // Set its world position bodyDef.position.set(position.x, position.y) bodyDef.type = BodyDef.BodyType.DynamicBody bodyDef.angle = 0f val body = world.createBody(bodyDef) val shape = CircleShape() shape.radius = 8f // 2. Create a FixtureDef, as usual. val fd = FixtureDef() fd.density = 1f fd.friction = 2f fd.shape = shape body.createFixture(fd) body.userData = Any // attach sprite data shape.dispose()

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var world = World(Vector2(0, -10), true) // ... val bodyDef = BodyDef() // Set its world position bodyDef.position.set(position.x, position.y) bodyDef.type = BodyDef.BodyType.DynamicBody bodyDef.angle = 0f val body = world.createBody(bodyDef) val shape = CircleShape() shape.radius = 8f // 2. Create a FixtureDef, as usual. val fd = FixtureDef() fd.density = 1f fd.friction = 2f fd.shape = shape body.createFixture(fd) body.userData = Any // attach sprite data shape.dispose()

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Traversable

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The ball and boxes use 
 AABB Physic Engine Wreckages use 
 Box2D Physic Engine

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Animations

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// load texture val texture = Texture(Gdx.files.internal("texture.png")) val split = TextureRegion.split(texture, 128, 128) // select frames val frames = Array() frames.add(split[0][0]) frames.add(split[0][1]) frames.add(split[0][2]) frames.add(split[0][4]) // create animation val animation = Animation(100f, frames) // select frame to draw val keyToRender = animation.getKeyFrame(time)

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// load texture val texture = Texture(Gdx.files.internal("texture.png")) val split = TextureRegion.split(texture, 128, 128) // select frames val frames = Array() frames.add(split[0][0]) frames.add(split[0][1]) frames.add(split[0][2]) frames.add(split[0][4]) // create animation val animation = Animation(100f, frames) // select frame to draw val keyToRender = animation.getKeyFrame(time)

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// load texture val texture = Texture(Gdx.files.internal("texture.png")) val split = TextureRegion.split(texture, 128, 128) // select frames val frames = Array() frames.add(split[0][0]) frames.add(split[0][1]) frames.add(split[0][2]) frames.add(split[0][4]) // create animation val animation = Animation(100f, frames) // select frame to draw val keyToRender = animation.getKeyFrame(time)

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// load texture val texture = Texture(Gdx.files.internal("texture.png")) val split = TextureRegion.split(texture, 128, 128) // select frames val frames = com.badlogic.gdx.utils.Array() frames.add(split[0][0]) frames.add(split[0][1]) frames.add(split[0][2]) frames.add(split[0][4]) // create animation val animation = Animation(100f, frames) // select frame to draw val keyToRender = animation.getKeyFrame(time) import com.badlogic.gdx.utils.Array as GdxArray

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// load texture val texture = Texture(Gdx.files.internal("texture.png")) val split = TextureRegion.split(texture, 128, 128) // select frames val frames = GdxArray() frames.add(split[0][0]) frames.add(split[0][1]) frames.add(split[0][2]) frames.add(split[0][4]) // create animation val animation = Animation(100f, frames) // select frame to draw val keyToRender = animation.getKeyFrame(time)

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// load texture val texture = Texture(Gdx.files.internal("texture.png")) val split = TextureRegion.split(texture, 128, 128) // select frames val frames = GdxArray() frames.add(split[0][0]) frames.add(split[0][1]) frames.add(split[0][2]) frames.add(split[0][4]) // create animation val animation = Animation(100f, frames) // select frame to draw val keyToRender = animation.getKeyFrame(time) Duration per frame

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100ms 100ms 100ms 100ms

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800ms 100ms 100ms 100ms 100ms 100ms 100ms 100ms 100ms 100ms 100ms

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y = Interpolation.bounceOut.apply(time) * 100f Non linear Should be a percentage (0..1) y will go from 0 to 100

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Linear Bounce Elastic Pow2

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Field Of View

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viewport.camera.position.add(0f, 40f, 0f) // Recalculates the projection and // view matrix of this camera // Use this after you've manipulated any of // the attributes of the camera. viewport.camera.update() viewport.camera.rotate(10f, 0f, 0f, 1f) viewport.camera.update()

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viewport.camera.position.add(0f, 40f, 0f) // Recalculates the projection and // view matrix of this camera // Use this after you've manipulated any of // the attributes of the camera. viewport.camera.update() viewport.camera.rotate(10f, 0f, 0f, 1f) viewport.camera.update() Will move the camera up

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viewport.camera.position.add(0f, 40f, 0f) // Recalculates the projection and // view matrix of this camera // Use this after you've manipulated any of // the attributes of the camera. viewport.camera.update() viewport.camera.rotate(10f, 0f, 0f, 1f) viewport.camera.update() Rotate the camera on the z Axis

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viewport.camera.rotate(10f, 0f, 0f, 1f)

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Our world
 (Orientation: Portrait)

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ScreenViewport

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StretchViewport

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FitViewport Clear this zone Clear this zone

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FillViewport

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ExtendViewport Displaying this zone

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class MyScreen : ScreenAdapter() { private lateinit var viewport: Viewport private lateinit var bath: SpriteBatch override fun show() { viewport = FitViewport(200f, 200f) bath = SpriteBath() } override fun render(delta: Float) { Gdx.gl.glClearColor(91f / 256f, 110f / 256f, 225f / 256f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() batch.projectionMatrix = viewport.camera.combined // render batch.end() } override fun resize(width: Int, height: Int) { viewport.update(width, height) } }

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class MyScreen : ScreenAdapter() { private lateinit var viewport: Viewport private lateinit var bath: SpriteBatch override fun show() { viewport = FitViewport(200f, 200f) bath = SpriteBath() } override fun render(delta: Float) { Gdx.gl.glClearColor(91f / 256f, 110f / 256f, 225f / 256f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() batch.projectionMatrix = viewport.camera.combined // render batch.end() } override fun resize(width: Int, height: Int) { viewport.update(width, height) } } Size of the world you’ll display on the screen

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class MyScreen : ScreenAdapter() { private lateinit var viewport: Viewport private lateinit var bath: SpriteBatch override fun show() { viewport = FitViewport(200f, 200f) bath = SpriteBath() } override fun render(delta: Float) { Gdx.gl.glClearColor(91f / 256f, 110f / 256f, 225f / 256f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() batch.projectionMatrix = viewport.camera.combined // render batch.end() } override fun resize(width: Int, height: Int) { viewport.update(width, height) } }

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Around the game

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dependencies { compile "com.badlogicgames.gdx:gdx:$gdxVersion" compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" compile "com.badlogicgames.ashley:ashley:$ashleyVersion" compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion" compile "io.github.libktx:ktx-ashley:$ktxVersion" compile "io.github.libktx:ktx-graphics:$ktxVersion" compile "io.github.libktx:ktx-scene2d:$ktxVersion" compile "io.github.libktx:ktx-log:$ktxVersion" compile "com.github.dwursteisen.libgdx-addons:aseprite-addons:$libgdx_addons" compile "com.github.dwursteisen.libgdx-addons:ashley-addons:$libgdx_addons" compile "com.strongjoshua:libgdx-inGameConsole:$console" }

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dependencies { compile "com.badlogicgames.gdx:gdx:$gdxVersion" compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" compile "com.badlogicgames.ashley:ashley:$ashleyVersion" compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion" compile "io.github.libktx:ktx-ashley:$ktxVersion" compile "io.github.libktx:ktx-graphics:$ktxVersion" compile "io.github.libktx:ktx-scene2d:$ktxVersion" compile "io.github.libktx:ktx-log:$ktxVersion" compile "com.github.dwursteisen.libgdx-addons:aseprite-addons:$libgdx_addons" compile "com.github.dwursteisen.libgdx-addons:ashley-addons:$libgdx_addons" compile "com.strongjoshua:libgdx-inGameConsole:$console" }

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dependencies { compile "com.badlogicgames.gdx:gdx:$gdxVersion" compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" compile "com.badlogicgames.ashley:ashley:$ashleyVersion" compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion" compile "io.github.libktx:ktx-ashley:$ktxVersion" compile "io.github.libktx:ktx-graphics:$ktxVersion" compile "io.github.libktx:ktx-scene2d:$ktxVersion" compile "io.github.libktx:ktx-log:$ktxVersion" compile "com.github.dwursteisen.libgdx-addons:aseprite-addons:$libgdx_addons" compile "com.github.dwursteisen.libgdx-addons:ashley-addons:$libgdx_addons" compile "com.strongjoshua:libgdx-inGameConsole:$console" }

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dependencies { compile "com.badlogicgames.gdx:gdx:$gdxVersion" compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" compile "com.badlogicgames.ashley:ashley:$ashleyVersion" compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion" compile "io.github.libktx:ktx-ashley:$ktxVersion" compile "io.github.libktx:ktx-graphics:$ktxVersion" compile "io.github.libktx:ktx-scene2d:$ktxVersion" compile "io.github.libktx:ktx-log:$ktxVersion" compile "com.github.dwursteisen.libgdx-addons:aseprite-addons:$libgdx_addons" compile "com.github.dwursteisen.libgdx-addons:ashley-addons:$libgdx_addons" compile "com.strongjoshua:libgdx-inGameConsole:$console" }

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dependencies { compile "com.badlogicgames.gdx:gdx:$gdxVersion" compile "com.badlogicgames.gdx:gdx-box2d:$gdxVersion" compile "com.badlogicgames.ashley:ashley:$ashleyVersion" compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion" compile "io.github.libktx:ktx-ashley:$ktxVersion" compile "io.github.libktx:ktx-graphics:$ktxVersion" compile "io.github.libktx:ktx-scene2d:$ktxVersion" compile "io.github.libktx:ktx-log:$ktxVersion" compile "com.github.dwursteisen.libgdx-addons:aseprite-addons:$libgdx_addons" compile "com.github.dwursteisen.libgdx-addons:ashley-addons:$libgdx_addons" compile "com.strongjoshua:libgdx-inGameConsole:$console" }

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Entities & Ashley

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Entity Player Monster Knight Ghoul

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Composition 
 over 
 Inheritance

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Position Animation Player State Entity

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val player = Entity() player.add(Player())) player.add(Position(100 v2 100)) player.add(Animation("idle")) player.add(StateComponent()) Position Animation Player State

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ComponentMapper player = ComponentMapper.getFor(Player.class); ComponentMapper position = ComponentMapper.getFor(Position.class); ComponentMapper animation = ComponentMapper.getFor(Animation.class); ComponentMapper state = ComponentMapper.getFor(StateComponent.class); ... player.get(entity).life; position.get(entity).xy; animation.get(entity).getFrame(time); state.get(entity).time; Extractor Extraction

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inline fun EntitySystem.get(): ComponentMapper = 
 ComponentMapper.getFor(T::class.java) inline operator fun Entity.get(mapper: ComponentMapper): T = 
 mapper.get(this)

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val player: ComponentMapper = get() val position: ComponentMapper = get() val animation: ComponentMapper = get() val state: ComponentMapper = get() // access to components entity[player].life entity[position].xy entity[animation].frame(time) entity[state].time

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val player = get() val position = get() val animation = get() val state = get() // access to components entity[player].life entity[position].xy entity[animation].frame(time) entity[state].time

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val player = get() val position = get() val animation = get() val state = get() // access to components entity[player].life entity[position].xy entity[animation].frame(time) entity[state].time Accessing like a map

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inline fun EntitySystem.get(): ComponentMapper = 
 ComponentMapper.getFor(T::class.java) inline operator fun Entity.get(mapper: ComponentMapper): T = 
 mapper.get(this)

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Close Open

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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) } State Event Transition

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture = assetsManager.get("player.png", Texture::class.java)

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture = assetsManager.get("player.png", Texture::class.java)

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture = assetsManager.get("player.png", Texture::class.java)

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture = assetsManager.get("player.png", Texture::class.java)

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture = assetsManager.get("player.png", Texture::class.java) Call it in the render method

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture = assetsManager.get("player.png", Texture::class.java)

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val assetsManager = AssetManager() assetsManager.load("player.png", Texture::class.java) assetsManager.load("sfx/beat_intro.ogg", Music::class.java) assetsManager.load("krungthep2.fnt", BitmapFont::class.java) assetsManager.load("sheets/intro", Aseprite::class.java) // call it until it's loaded val isLoaded = assetsManager.update() val texture: Texture = assetsManager["player.png"] inline operator fun AssetManager.get(filename: String): T { return this.get(filename, T::class.java) }

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Integration with other tools

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// can be loaded using AssetManager too val tmxMap = TmxMapLoader().load(mapName) tmxMap.layers["bricks"]?.objects?.forEach { brick -> // create game entity } mapRenderer = OrthogonalTiledMapRenderer(tmxMap) // render method mapRenderer.setView(viewport.camera as OrthographicCamera) mapRenderer.render()

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// can be loaded using AssetManager too val tmxMap = TmxMapLoader().load(mapName) tmxMap.layers["bricks"]?.objects?.forEach { brick -> // create game entity } mapRenderer = OrthogonalTiledMapRenderer(tmxMap) // render method mapRenderer.setView(viewport.camera as OrthographicCamera) mapRenderer.render()

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// can be loaded using AssetManager too val tmxMap = TmxMapLoader().load(mapName) tmxMap.layers["bricks"]?.objects?.forEach { brick -> // create game entity } mapRenderer = OrthogonalTiledMapRenderer(tmxMap) // render method mapRenderer.setView(viewport.camera as OrthographicCamera) mapRenderer.render()

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// can be loaded using AssetManager too val tmxMap = TmxMapLoader().load(mapName) tmxMap.layers["bricks"]?.objects?.forEach { brick -> // create game entity } mapRenderer = OrthogonalTiledMapRenderer(tmxMap) // render method mapRenderer.setView(viewport.camera as OrthographicCamera) mapRenderer.render()

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hit 4 sound chicken.wav

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tmxMap.layers["bricks"].objects.forEach { brick -> val hit: Any = brick.properties["hit"] } Error prone Error prone

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class BrickProperties(properties: MapProperties) { val x: Double by properties val y: Double by properties val hit: Int by properties val sound: String by properties } tmxMap.layers["bricks"].objects.forEach { brick -> val props = BrickProperties(brick.properties) val hit = props.hit }

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class BrickProperties(properties: MapProperties) { val x: Double by properties val y: Double by properties val hit: Int by properties val sound: String by properties } tmxMap.layers["bricks"].objects.forEach { brick -> val props = BrickProperties(brick.properties) val hit = props.hit }

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class BrickProperties(properties: MapProperties) { val x: Double by properties val y: Double by properties val hit: Int by properties val sound: String by properties } tmxMap.layers["bricks"].objects.forEach { brick -> val props = BrickProperties(brick.properties) val hit = props.hit } Delegates

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inline operator fun MapProperties.getValue(thisRef: Any?, property: KProperty<*>): T { val asStr = this[property.name].toString() return when (T::class) { Double::class -> asStr.toDouble() Int::class -> asStr.toInt() Boolean::class -> "true" == asStr String::class -> asStr else -> this[property.name] } as T }

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val chicken: Aseprite = assets["sheets/chicken"] val idleAnimation: Animation = chicken["idle"] Inverser slides. Je veux accéder aux animations -> export des metas -> méthode d'extensions. 
 -> explication j'ai fais un plugin qui fait ça pour moi.

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Json Json Json

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open class AsepriteTask : DefaultTask() { // ... @TaskAction fun export() { val exec = getExecActionFactory().newExecAction() val exts = project.extensions.getByType(AsepritePluginExtentions::class.java) val aseprite = exts.exec ?: invalideAsepritePath() // ... } private fun invalideAsepritePath(): Nothing { TODO("""Missing aseprite executable path. Please configure it using aseprite.exec property (ie: in your ~/.gradle/gradle.properties) aseprite.exec= or using aseprite extension in your build.gradle aseprite { exec= } MacOS specific : point to aseprite located into /Aseprite.app/Contents/MacOS/aseprite""") } }

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open class AsepriteTask : DefaultTask() { // ... @TaskAction fun export() { val exec = getExecActionFactory().newExecAction() val exts = project.extensions.getByType(AsepritePluginExtentions::class.java) val aseprite = exts.exec ?: invalideAsepritePath() // ... } private fun invalideAsepritePath(): Nothing { TODO("""Missing aseprite executable path. Please configure it using aseprite.exec property (ie: in your ~/.gradle/gradle.properties) aseprite.exec= or using aseprite extension in your build.gradle aseprite { exec= } MacOS specific : point to aseprite located into /Aseprite.app/Contents/MacOS/aseprite""") } } What happen if null? Encountered an error, lol!

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open class AsepriteTask : DefaultTask() { // ... @TaskAction fun export() { val exec = getExecActionFactory().newExecAction() val exts = project.extensions.getByType(AsepritePluginExtentions::class.java) val aseprite = exts.exec ?: invalideAsepritePath() // ... } private fun invalideAsepritePath(): Nothing { TODO("""Missing aseprite executable path. Please configure it using aseprite.exec property (ie: in your ~/.gradle/gradle.properties) aseprite.exec= or using aseprite extension in your build.gradle aseprite { exec= } MacOS specific : point to aseprite located into /Aseprite.app/Contents/MacOS/aseprite""") } }

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open class AsepriteTask : DefaultTask() { // ... @TaskAction fun export() { val exec = getExecActionFactory().newExecAction() val exts = project.extensions.getByType(AsepritePluginExtentions::class.java) val aseprite = exts.exec ?: invalideAsepritePath() // ... } private fun invalideAsepritePath(): Nothing { TODO("""Missing aseprite executable path. Please configure it using aseprite.exec property (ie: in your ~/.gradle/gradle.properties) aseprite.exec= or using aseprite extension in your build.gradle aseprite { exec= } MacOS specific : point to aseprite located into /Aseprite.app/Contents/MacOS/aseprite""") } }

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Screens

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Scrollpane Label Button Select box

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val scene = verticalGroup { setFillParent(true) pad(10f) label("Hello JavaZone!") horizontalGroup { textButton("Click On Me") label("<-- here") } label("Another label...") selectBoxOf(GdxArray().apply { add("value 1") add("value 2") add("value 3") }) } stage = Stage(FitViewport(screenWidth, screenHeight)) stage.addActor(scene) Hello JavaZone!

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val scene = verticalGroup { setFillParent(true) pad(10f) label("Hello JavaZone!") horizontalGroup { textButton("Click On Me") label("<-- here") } label("Another label...") selectBoxOf(GdxArray().apply { add("value 1") add("value 2") add("value 3") }) } stage = Stage(FitViewport(screenWidth, screenHeight)) stage.addActor(scene) Hello JavaZone!

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val scene = verticalGroup { setFillParent(true) pad(10f) label("Hello JavaZone!") horizontalGroup { textButton("Click On Me") label("<-- here") } label("Another label...") selectBoxOf(GdxArray().apply { add("value 1") add("value 2") add("value 3") }) } stage = Stage(FitViewport(screenWidth, screenHeight)) stage.addActor(scene) Hello JavaZone!

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val scene = verticalGroup { setFillParent(true) pad(10f) label("Hello JavaZone!") horizontalGroup { textButton("Click On Me") label("<-- here") } label("Another label...") selectBoxOf(GdxArray().apply { add("value 1") add("value 2") add("value 3") }) } stage = Stage(FitViewport(screenWidth, screenHeight)) stage.addActor(scene) Hello JavaZone!

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Game screen screen screen screen screen

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open class MenuScreen(val game: Game) : ScreenAdapter() { override fun render(delta: Float) { // clear the screen Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() // ... batch.end() if (goToMenu) { game.setScreen(menuScreen) } } }

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open class MenuScreen(val game: Game) : ScreenAdapter() { override fun render(delta: Float) { // clear the screen Gdx.gl.glClearColor(0f, 0f, 0f, 1f) Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT) batch.begin() // ... batch.end() if (goToMenu) { game.setScreen(menuScreen) } } } ⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠ game.setScreen(screen) 
 is not the same that
 game.screen = screen ⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠⚠

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Pitfalls

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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() List 1 List 2 List 3 List 4 mutableList

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val ball = Rectangle(68f, 64f, 5f, 5f) val player = Rectangle(64f, 64f, 100f, 10f) // the ball hit the player? player.overlaps(ball)

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val pool = object : Pool() { override fun newObject(): Rectangle = Rectangle() } // ... val ball = pool.obtain().apply { set(68f, 64f, 5f, 5f) } val player = pool.obtain().apply { set(64f, 64f, 100f, 10f) } // the ball hit the player? player.overlaps(ball) pool.free(ball) pool.free(player)

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val pool = object : Pool() { override fun newObject(): Rectangle = Rectangle() } // ... val ball = pool.obtain().apply { set(68f, 64f, 5f, 5f) } val player = pool.obtain().apply { set(64f, 64f, 100f, 10f) } // the ball hit the player? player.overlaps(ball) pool.free(ball) pool.free(player)

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val pool = object : Pool() { override fun newObject(): Rectangle = Rectangle() } // ... val ball = pool.obtain().apply { set(68f, 64f, 5f, 5f) } val player = pool.obtain().apply { set(64f, 64f, 100f, 10f) } // the ball hit the player? player.overlaps(ball) pool.free(ball) pool.free(player)

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val pool = object : Pool() { override fun newObject(): Rectangle = Rectangle() } // ... val ball = pool.obtain().apply { set(68f, 64f, 5f, 5f) } val player = pool.obtain().apply { set(64f, 64f, 100f, 10f) } // the ball hit the player? player.overlaps(ball) pool.free(ball) pool.free(player)

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Shaders This section has nothing to do with Kotlin

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void main() {
 vec4 sum = vec4(0);
 
 float step = iResolution.y;
 // y
 for(float i = -area ; i <= area ; i += 1.) {
 // x
 for(float j = -area ; j <= area ; j += 1.) {
 float x = v_texCoords.x + i / iResolution.x;
 float y = v_texCoords.y + j / iResolution.y;
 sum += texture2D(u_texture, vec2(x, y)) * 0.005;
 }
 }
 gl_FragColor = texture2D(u_texture, v_texCoords) + sum;
 } OpenGL Shading Language (GLSL)

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if (color_pixel < cutoff) { // light dark pixel = gl_FragColor = vec4(0.3, 0.2, 0.4., 1.0); } else { pixel = color_pixel; } 0 1 Cut off

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if (color_pixel < cutoff) { // light dark pixel = gl_FragColor = vec4(0.3, 0.2, 0.4., 1.0); } else { pixel = color_pixel; }

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https://www.shadertoy.com/view/ld3Gz2

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fun makeGames()

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fun makeGames()

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Beat The High Score Game https://github.com/dwursteisen/beat-the-high-score libGDX Lib https://libgdx.badlogicgames.com/ KTX 
 (This is NOT Android KTX) Lib https://github.com/libktx/ktx/ libGDX addons Lib https://github.com/dwursteisen/libgdx-addons/ kTerminal Lib https://github.com/heatherhaks/kterminal Game Services Lib https://github.com/MrStahlfelge/gdx-gamesvcs In Game Console
 (A la quake) Lib https://github.com/StrongJoshua/libgdx-inGameConsole Gif Recorder Lib https://github.com/Anuken/GDXGifRecorder Tiled Editor Editor https://www.mapeditor.org Aseprite Editor https://www.aseprite.org

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Beat The High Score Game https://github.com/dwursteisen/beat-the-high-score libGDX Lib https://libgdx.badlogicgames.com/ KTX 
 (This is NOT Android KTX) Lib https://github.com/libktx/ktx/ libGDX addons Lib https://github.com/dwursteisen/libgdx-addons/ kTerminal Lib https://github.com/heatherhaks/kterminal Game Services Lib https://github.com/MrStahlfelge/gdx-gamesvcs In Game Console
 (A la quake) Lib https://github.com/StrongJoshua/libgdx-inGameConsole Gif Recorder Lib https://github.com/Anuken/GDXGifRecorder Tiled Editor Editor https://www.mapeditor.org Aseprite Editor https://www.aseprite.org

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@dwursteisen http://bit.ly/2poORfk