SKFun - Speaker Deck

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willrax

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Sydney, Australia

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SKFun

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2D Sprites and Animations

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OSX and iOS

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OSX and iOS

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eleven things I wish I knew eleven months ago

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one

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Coordinates + +

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Coordinates + +

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Down Under Mode

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two

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One UIView

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scene = MyScene.alloc.initWithSize(size) ! view.showsFPS = true view.presentScene(scene) class ! ! ! ! end

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three

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Many scenes

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ice ﬁre credits cut scene menus

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MyView

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MyView

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class ! ! ! ! ! ! ! ! end def didMoveToView(view) super ! ! ! ! ! end add_skyline add_ground add_pipes add_bird

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Game Loop

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Update

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Update Actions

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Update Actions Physics

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Update Actions Physics Render

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def update end ! def didEvaluateActions end ! def didSimulatePhysics end

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SKNode

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Video Shape Label Particle

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Sprite Node

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image = "bird.png" ! bird = SKSpriteNode.spriteNodeWithImageNamed(image) bird.name = “bird" ! scene.addChild(bird)

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Sprite Animation

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def flap ! ! ! ! ! ! ! ! ! ! end one = SKTexture.textureWithImageNamed(“1.png") two = SKTexture.textureWithImageNamed(“2.png") three = SKTexture.textureWithImageNamed(“3.png”) textures = [one, two, three] animation = SKAction.animateWithTextures(textures, timePerFrame: 0.15) bird.repeatActionForever(animation)

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Scrolling Images

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SKFun

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ﬁve

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! Actions Are Magical "

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def add_skyline txt = SKTexture.textureWithImageNamed(“s.png“) ! mid_x = CGRectGetMidX(self.frame) mid_y = CGRectGetMidY(self.frame) ! ! ! ! ! ! ! ! ! ! ! end position = mid_x + (i * mid_x * 2) ! sky = SKSpriteNode.spriteNodeWithTexture(txt) sky.position = CGPointMake(position, mid_y) sky.runAction scroll_action(mid_x, 0.1) ! scene.addChild(sky) 2.times do |i| ! ! ! ! ! ! ! end

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def scroll_action(x, time) ! ! ! ! ! ! ! ! ! end width = (x * 2) dur = time * width ! move = SKAction.moveByX(-width, y: 0, duration: dur) reset = SKAction.moveByX(width, y: 0, duration: 0.0) sequence = SKAction.sequence([move, reset]) ! SKAction.repeatActionForever(sequence)

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Parallax

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def ! mid_x = CGRectGetMidX(self.frame) mid_y = CGRectGetMidY(self.frame) ! ! ! ! ! ! ! ! ! ! ! end position ! sky sky.position sky.runAction scroll_action(mid_x, ! scene.addChild(sky 2 ! ! ! ! ! ! ! end txt = SKTexture.textureWithImageNamed(“s.png“)

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six

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Textures are reusable

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Node 1 Node 2

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seven

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Nodes can be added to other nodes

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class PipePair < SKNode end

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Up Down Pipe Pair

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One node

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def init super self.addChild(top_pipe) self.addChild(bottom_pipe) self end ! def top pipe = SKSpriteNode.spriteNodeWithImageNamed(“t.png”) pipe.position = CGPointMake(0, y + 450) pipe end ! def bottom pipe = SKSpriteNode.spriteNodeWithImageNamed(“b.png”) pipe.position = CGPointMake(0, y) pipe end

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SKPhysicsWorld

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def ! ! ! ! ! end earth = CGVectorMake(0,-5.0) ! physicsWorld.speed = 1.0 physicsWorld.gravity = earth

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eight

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What are CGVectors?

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-20 -20 CGVectorMake(-20,-20)

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20 20 CGVectorMake(20, 20)

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2000 2000 CGVectorMake(2000, 2000)

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Physics Body

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Physics bring life to your nodes

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body = SKPhysicsBody.bodyWithRectangleOfSize(size) body.dynamic = true ! bird.physicsBody = body bird size

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body.dynamic = false body.dynamic = true dynamic static SKPhysicsBody.bodyWithEdgeLoopFromRect(frame) edge loop

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- touchesBegan(touches, withEvent: event) ! - touchesMoved(touches, withEvent: event) ! - touchesEnded(touches, withEvent: event) ! - touchesCancelled(touches, withEvent: event)

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def touchesBegan(touches, withEvent: event) node = childNodeWithName "bird" ! node.physicsBody.velocity = CGVectorMake(0, 0) node.physicsBody.applyImpulse CGVectorMake(0, 8) end

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ten

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Collision vs Contact

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Collision is automatic

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Contact is voluntary

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BIRD = 0x1 < 1 GROUND = 0x1 < 2 PIPE = 0x1 < 3 ! pipe.physicsBody.categoryBitMask = WORLD ground.physicsBody.categoryBitMask = WORLD bird.physicsBody.categoryBitMask = BIRD bird.physicsBody.contactTestBitMask = WORLD WORLD = GROUND | PIPE

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def super ! ! ! ! end ! physicsWorld.gravity ! setup_scene class ! ! ! ! ! ! ! end physicsWorld.contactDelegate = self

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❗️

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def didBeginContact(contact) restart_bird reset_pipes end

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eleven

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controllers.

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controllers. are awesome

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app.frameworks += ["GameController"] That’s it.

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def check_controller bird = childNodeWithName("bird") ! controllers = GCController.controllers controller = controllers.first.extendedGamepad ! if controller.buttonA.isPressed? bird.physicsBody.velocity = CGVectorMake(0, 0) bird.physicsBody.applyImpulse CGVectorMake(0, 8) end end