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ES6 Inheritance from ES5 Classes with EaselJS
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| // EaselJS still has some problems compiling with Webpack/CommonJS as of this | |
| // publishing (01/23/2016), which makes it difficult to write modularity | |
| // in ES6 for it. However, it's not that hard to work around: | |
| import { Car, Mustang } from './Cars'; | |
| let createjs = window.createjs; // local reference to createjs and bypasses the current module issues | |
| let stage = new createjs.Stage('car_canvas'); | |
| let car = new Car({ | |
| color: '#0081c9', | |
| id: 'car1', | |
| name: 'Bog Standard Car', | |
| x: '50', | |
| y: '50', | |
| radius: '35' | |
| }); | |
| car.type(); // I am a normal car and my name is: Bog Standard Car | |
| let mustang = new Mustang({ | |
| color: '#fff', | |
| id: 'mustang', | |
| name: 'Mustang Sally', | |
| x: '200', | |
| y: '200', | |
| radius: '50' | |
| }); | |
| mustang.type(); // I am a Mustang and my name is: Mustang Sally | |
| function tick(event) { | |
| // update stage code | |
| } | |
| document.addEventListener('DOMContentLoaded', function () { | |
| stage.addChild(bg1); | |
| stage.addChild(bg2); | |
| stage.addChild(ug); | |
| createjs.Ticker.setFPS(30); | |
| createjs.Ticker.addEventListener('tick', stage); | |
| createjs.Ticker.addEventListener('tick', tick); | |
| }); |
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| let Shape = window.createjs.Shape; | |
| export class Car extends Shape { | |
| constructor(options) { | |
| super(); | |
| // The Shape class's constructor doesn't fire through the normal | |
| // ES6 constructor->super() function, so we have to initiate the | |
| // old way, and then return it as as the constructed object | |
| let c = new Shape(); | |
| c.id = options.id; | |
| c.name = options.name; | |
| c.color = options.color; | |
| c.graphics | |
| .beginFill(options.color) | |
| .drawCircle(0, 0, options.radius); | |
| c.x = options.x; | |
| c.y = options.y; | |
| g.type = this.type; | |
| return g; | |
| } | |
| type() { | |
| console.log('I am a normal car and my name is: ', this.name); | |
| } | |
| } | |
| export class Mustang extends Card { | |
| constructor(options) { | |
| // Car's constructor->super() is returning an object still, | |
| // so we need to return that again or the Mustang object | |
| // doesn't draw itself properly | |
| return super(options); | |
| } | |
| type() { | |
| console.log('I am a Mustang and my name is: ', this.name); | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>EaselJS with ES6 Classes</title> | |
| </head> | |
| <body> | |
| <canvas id="car_canvas" width="800" height="800"></canvas> | |
| <script src="https://code.createjs.com/easeljs-0.8.2.min.js"></script> | |
| <script src="app.js"></script> | |
| </body> | |
| </html> |
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