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REACT AND GAMES An experiment about making games

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@BOBYLITO

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+ = ?

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LITTLE SHOOTER V2

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1. (re)Introduction to React 2. Game dev patterns with React 3. Demo 4. Next

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No content

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RENDERING 1 React.render(
Hello World
, document.body );

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CUSTOM COMPONENTS 1 var MyComponent = React.createClass({ 2 render: function(){ 3 return
4 } 5 }); 6 React.render( , document.body );

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COMPONENT STATE 1 var MyComponent = React.createClass({ 2 //state: {} 3 getInitialState: function(){ return {foo:"bar"} }, 4 render: function(){ 5 var valueFromState = this.state.foo; 6 return
7 } 8 //setState: function( newState ){ /*set the new state*/ } 9 });

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LIFECYCLE AND HOOKS 1 var MyComponent = React.createClass({ 2 render: function(){ 3 return
4 }, 5 componentWillMount: function(){}, 6 componentWillReceiveProps: function( props ){ /* new values handling, modify state ;) */} 7 });

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No content

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T-0 T-1 Diff T-0 T-1

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LET’S MAKE A GAME!

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GAME LOOP

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GAME LOOP

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GAME LOOP Repeat

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GAME LOOP Repeat Render

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GAME LOOP Repeat Render Update game state

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GAME LOOP Repeat Render Update game state Get input

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1 var GameApp = React.createClass({ 2 getInitialState: function(){ 3 return { 4 input : { 5 time : (Date.now()) } }; 6 }, 7 render : function(){ 8 return 9 }, 10 tick : function(){ 11 var t = Date.now(); 12 requestAnimationFrame(this.tick); 13 this.setState({ 14 input:{ 15 time : t 16 } 17 }); 18 }, 19 componentWillMount : function(){ 20 requestAnimationFrame( this.tick ); 21 }, 22 }); 23 24 var output = d.getElementById("main"); 25 React.renderComponent( , output);

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INPUTS • Time • Keys

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TIME • Date.now() at the tick • Store the time in the state • Propagate to sub components • Will trigger the rendering even if nothing else happen from the real world

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KEYS • Bind event listeners to the main component • Properly handle auto fire

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1 ... 2 render : function(){ 3 return
; 6 }, 7 keyHandler : function(valueToSet, e){ 8 var newKeys = { 9 left : this.state.input.keys.left, 10 right : this.state.input.keys.right, 11 up : this.state.input.keys.up, 12 down : this.state.input.keys.down, 13 space : this.state.input.keys.space 14 }; 15 16 if(e.keyCode === 37) newKeys.left = valueToSet; 17 if(e.keyCode === 38) newKeys.up = valueToSet; 18 if(e.keyCode === 39) newKeys.right = valueToSet; 19 if(e.keyCode === 40) newKeys.down = valueToSet; 20 if(e.keyCode === 32) newKeys.space = valueToSet; 21 22 this.setState({ 23 input:{ 24 time : this.state.input.time, 25 keys : newKeys } }); 26 } 27 ...

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GAME SCREENS

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div React.render( )
A B C div div div

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A B C div div div

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A B C div div div

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GameApp Game Intro Score Horde Ouno HUD Ship Rocket Launcher Rocket Particle System

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GameApp Game Intro Score Horde Ouno HUD Ship Rocket Launcher Rocket Particle System Router

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GameApp Game Intro Score Horde Ouno HUD Ship Rocket Launcher Rocket Particle System Screens Router

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GameApp Game Intro Score Horde Ouno HUD Ship Rocket Launcher Rocket Particle System Screens Other Router

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THE WORLD

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MODEL • One centralized model for the game • Old school prototypal objects • One function to update the world

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No content

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ONE WAY

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ONE WAY MailBox

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ONE WAY MailBox

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ONE WAY MailBox

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ONE WAY MailBox

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COMMUNICATION • Every frame there is an update • Simple message box system • Every component can send events • Each tick, the model is updated with the events • Message box is emptied once read

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World App state Special fx

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DEMO

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FUTURE • Mixins • Game loop • Game screen • Sprites • Ludum dare

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QUESTIONS? https://github.com/bobylito/littleshooter2/

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REFERENCES • React : http://facebook.github.io/react/ • Other related frameworks based on React for doing similar stuff : • Pixi / react : https://github.com/Izzimach/react- pixi • React art : https://github.com/reactjs/react-art