Forked from Captain Anonymous's Pen WrbaVK.
A Pen by Carlos de la Orden on CodePen.
Created
December 8, 2015 19:51
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Space React
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| <body> | |
| <div id="app">Hey you!</div> | |
| ` | |
| </body> |
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| function getRnd(min, max){ | |
| let n = Math.round(Math.random()*max); | |
| if(n < min) return min; | |
| return n; | |
| } | |
| function nextFrame(){ | |
| window.requestAnimationFrame(Store.update.bind(Store)); | |
| } | |
| const Bola = (props) => ( | |
| <ellipse rx={ props.rx } ry={props.ry} fill="#def" cx={ props.x} cy={props.y} /> | |
| ); | |
| const Store = { | |
| __listeners: [], | |
| __balls: [], | |
| addListener(cb){ | |
| this.__listeners.push(cb); | |
| }, | |
| emitChange(){ | |
| this.__listeners.forEach(cb => cb()); | |
| }, | |
| getBalls(){ | |
| return this.__balls; | |
| }, | |
| init(max){ | |
| for(var i=0; i < max; i++){ | |
| this.__balls.push(Immutable.Map({ | |
| x: getRnd(0, 1024), | |
| y: getRnd(0, 400), | |
| speed: getRnd(0.5, 4) | |
| })); | |
| } | |
| }, | |
| update(){ | |
| this.__balls = this.__balls.map(b => { | |
| let x = b.get('x'); | |
| if(x > 1024) | |
| x = 0 | |
| else | |
| x += b.get('speed'); | |
| return b.set('x', x); | |
| }); | |
| this.emitChange(); | |
| nextFrame(); | |
| } | |
| } | |
| const Game = React.createClass({ | |
| componentDidMount(){ | |
| Store.init(50); | |
| Store.addListener(() => this.forceUpdate()); | |
| nextFrame(); | |
| }, | |
| render(){ | |
| const balls = Store.__balls.map((b,index) => ( | |
| <Bola key={ index } x={ b.get('x') } y={ b.get('y') } rx="4" ry="4" /> | |
| )); | |
| return ( | |
| <svg width={ 1024 } height={ 400 }> | |
| { balls } | |
| </svg> | |
| ) | |
| } | |
| }); | |
| window.onload = React.render(<Game />, document.getElementById('app')); |
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| <script src="//cdnjs.cloudflare.com/ajax/libs/react/0.14.3/react.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.7.5/immutable.min.js"></script> |
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| #app { | |
| background: #000; | |
| color: #fff | |
| } |
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