diff --git a/frontend/static/js/views/Game.js b/frontend/static/js/views/Game.js index 62b8e80..4354d0a 100644 --- a/frontend/static/js/views/Game.js +++ b/frontend/static/js/views/Game.js @@ -10,22 +10,41 @@ export default class extends AbstractView { return `

Game

+ `; } async postInit() { - document.getElementById('startGameButton').onclick = this.startGame; + document.getElementById('startGameButton').onclick = this.startGame.bind(this); + document.getElementById('stopGameButton').onclick = this.stopGame.bind(this); } startGame() { - if (this.game == null) + if (this.game == null) { + document.getElementById('startGameButton').innerHTML = 'Reset Game'; this.game = new Game; + } + else { + document.getElementById('app').removeChild(this.game.canvas); + this.game.cleanup(); + this.game = new Game; + } + } + + stopGame() { + if (!this.game) + return; + document.getElementById('app').removeChild(this.game.canvas); + this.game.cleanup(); + this.game = null; + document.getElementById('startGameButton').innerHTML = 'Start Game'; } } class Game { constructor() { this.canvas = document.createElement('canvas'); + this.canvas.id = 'gameCanvas'; this.canvas.width = 480; this.canvas.height = 270; this.canvas.style.border = '1px solid #d3d3d3'; @@ -33,13 +52,22 @@ class Game { this.context = this.canvas.getContext('2d'); this.paddle = new Paddle(this.context); + this.ball = new Ball(this.context); document.getElementById('app').appendChild(this.canvas); this.interval = setInterval(this.updateGame.bind(this), 10); this.keys = []; - document.addEventListener('keydown', this.keyDownHandler.bind(this)); - document.addEventListener('keyup', this.keyUpHandler.bind(this)); + this.keyUpHandler = this.keyUpHandler.bind(this); + this.keyDownHandler = this.keyDownHandler.bind(this); + document.addEventListener('keydown', this.keyDownHandler); + document.addEventListener('keyup', this.keyUpHandler); + } + + cleanup() { + clearInterval(this.interval); + document.removeEventListener('keydown', this.keyDownHandler); + document.removeEventListener('keyup', this.keyUpHandler); } clear() { @@ -47,13 +75,34 @@ class Game { } updateGame() { - if (this.keys.includes('s')) - this.paddle.y += 3; - if (this.keys.includes('w')) - this.paddle.y -= 3; + + if (this.keys.includes('Escape')) + this.cleanup(); + + if (this.keys.includes('s') && + this.paddle.y + this.paddle.height < this.canvas.height - this.paddle.x) + this.paddle.y += this.paddle.speed; + if (this.keys.includes('w') && + this.paddle.y > 0 + this.paddle.x) + this.paddle.y -= this.paddle.speed; + + if (this.ball.x - this.ball.radius <= this.paddle.x + this.paddle.width + && (this.ball.y >= this.paddle.y && this.ball.y <= this.paddle.y + this.paddle.height)) + this.ball.vx *= -1; + if (this.ball.x - this.ball.radius <= 0) + this.ball.vx *= -1; + else if (this.ball.x + this.ball.radius >= this.canvas.width) + this.ball.vx *= -1; + if (this.ball.y - this.ball.radius <= 0) + this.ball.vy *= -1; + else if (this.ball.y + this.ball.radius >= this.canvas.height) + this.ball.vy *= -1; + this.ball.x += this.ball.vx; + this.ball.y += this.ball.vy; this.clear(); this.paddle.update(); + this.ball.update(); } keyUpHandler(ev) { @@ -63,7 +112,7 @@ class Game { } keyDownHandler(ev) { - if (this.keys.indexOf(ev.key) == -1) + if (!this.keys.includes(ev.key)) this.keys.push(ev.key); } } @@ -74,6 +123,7 @@ class Paddle { this.height = 70; this.x = 5; this.y = 100; + this.speed = 3; this.ctx = context; this.update(); } @@ -83,3 +133,22 @@ class Paddle { this.ctx.fillRect(this.x, this.y, this.width, this.height); } } + +class Ball { + constructor(context) { + this.radius = 5; + this.x = 240; + this.y = 135; + this.vx = 2; + this.vy = 2; + this.ctx = context; + this.update(); + } + + update() { + this.ctx.fillStyle = 'black'; + this.ctx.beginPath(); + this.ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI); + this.ctx.fill(); + } +}