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// some default values | |
const defaultConfig = { | |
width: 500, | |
height: 500, | |
gravity: 0.25, | |
friction: 0.98 | |
} | |
// classes are functions that create objects | |
// and we're exporting it to use in another file | |
export class Scene { | |
// constructor function is the equivalent of | |
// the init function | |
constructor (canvasId = 'gameCanvas', config) { | |
// get the canvas and context | |
this.canvas = document.getElementById(canvasId) | |
this.ctx = this.canvas.getContext('2d') | |
// world/physics settings | |
// merge default config & any passed in config by *spreading* them | |
this.config = { | |
...defaultConfig, | |
...config | |
} | |
// set the canvas size | |
this.canvas.width = this.config.width | |
this.canvas.height = this.config.height | |
// begin update loop | |
// use an *arrow function* so that we can use `this` properly | |
document.addEventListener('DOMContentLoaded', () => this.update()) | |
} | |
update () { | |
// *destructure* the scene's variables | |
const { ctx, config } = this | |
// queue the next update | |
window.requestAnimationFrame(() => this.update()) | |
// clear the canvas | |
ctx.clearRect(0, 0, config.width, config.height) | |
// draw objects | |
} | |
} | |
// only use export with the boilerplate; otherwise ignore it | |
export default Scene |
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