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index.html
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<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>νν κ²μ΄μ</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<body>
<script>
const BALL_SPEED = 15, PLAYER_SPEED = BALL_SPEED / 1.5;
const SMASH_SPEED_MULTIPLE = 1.5;
const FORWARD = 1, OPPOSITE = -1;
const WIDTH = 700, HEIGHT = 600;
let canvas, context, keyState, win, lose;
const player = {
x: null,
y: null,
width: 20,
height: 100,
update: function() {
if (keyState.ArrowUp) {
this.y -= PLAYER_SPEED;
}
if (keyState.ArrowDown) {
this.y += PLAYER_SPEED;
}
this.y = Math.max(Math.min(this.y, HEIGHT - this.height), 0);
},
draw: function() {
context.fillRect(
this.x,
this.y,
this.width,
this.height
);
}
};
const ai = {
x: null,
y: null,
width: 20,
height: 100,
update: function() {
const destination = ball.y - (this.height - ball.side) / 2 * .5;
this.y += (destination - this.y) * .2;
this.y = Math.max(Math.min(this.y, HEIGHT - this.height), 0);
},
draw: function() {
context.fillRect(
this.x,
this.y,
this.width,
this.height
);
}
};
const ball = {
x: null,
y: null,
side: 20,
velocity: {
x: 0,
y: 0
},
serve: function(side) {
const randomValue = Math.random();
this.x = side === FORWARD ? player.x + player.width : ai.x - this.side;
this.y = (HEIGHT - this.side) * randomValue;
const phi = .1 * Math.PI * (1 - 2 * randomValue);
this.velocity.x = side * BALL_SPEED * Math.cos(phi);
this.velocity.y = BALL_SPEED * Math.sin(phi);
},
update: function() {
this.x += this.velocity.x;
this.y += this.velocity.y;
if (0 > this.y || this.y + this.side > HEIGHT) {
const getOffset = () => {
if (this.velocity.y < 0) {
return 0 - this.y;
}
return HEIGHT - (this.y + this.side);
}
this.y += 2 * getOffset();
this.velocity.y *= OPPOSITE;
}
const axisAlignedBoundingBoxesIntersect = (paddleX, paddleY, paddleWidth, paddleHeight,
ballX, ballY, ballWidth, ballHeight) => {
return paddleX < ballX + ballWidth &&
paddleY < ballY + ballHeight &&
ballX < paddleX + paddleWidth &&
ballY < paddleY + paddleHeight;
}
const paddle = this.velocity.x < 0 ? player : ai;
const isIntersect = axisAlignedBoundingBoxesIntersect(
paddle.x,
paddle.y,
paddle.width,
paddle.height,
this.x,
this.y,
this.side,
this.side
);
const isPlayer = paddle === player;
const direction = isPlayer ? FORWARD : OPPOSITE;
if (isIntersect) {
this.x = isPlayer ? player.x + player.width : ai.x - this.side;
const betweenPaddles = (this.y + this.side - paddle.y) / (paddle.height + this.side);
const radian = .25 * Math.PI;
const phi = radian * (2 * betweenPaddles - 1);
this.velocity.x = direction * BALL_SPEED * Math.cos(phi);
this.velocity.y = BALL_SPEED * Math.sin(phi);
const isSmash = Math.abs(phi) > .2 * Math.PI;
if (isSmash) {
this.velocity.x *= SMASH_SPEED_MULTIPLE;
this.velocity.y *= SMASH_SPEED_MULTIPLE;
}
}
if (0 > this.x + this.side) {
++lose;
this.serve(direction);
}
if (this.x > WIDTH) {
++win;
this.serve(direction);
}
},
draw: function() {
context.fillRect(
this.x,
this.y,
this.side,
this.side
);
}
};
function main() {
canvas = document.createElement('canvas');
canvas.width = WIDTH;
canvas.height = HEIGHT;
context = canvas.getContext('2d');
keyState = { };
document.addEventListener('keydown', event => keyState[event.key] = true);
document.addEventListener('keyup', event => delete keyState[event.key]);
document.body.appendChild(canvas);
init();
loop();
}
function init() {
win = 0;
lose = 0;
player.x = player.width;
player.y = (HEIGHT - player.height) / 2;
ai.x = WIDTH - (player.width + ai.width);
ai.y = (HEIGHT - ai.height) / 2;
ball.serve(FORWARD);
}
function loop() {
update();
draw();
window.requestAnimationFrame(loop);
}
function update() {
player.update();
ai.update();
ball.update();
}
function draw() {
context.fillRect(
0,
0,
WIDTH,
HEIGHT
);
context.save();
context.fillStyle = '#FFF';
player.draw();
ai.draw();
ball.draw();
const width = 4;
const x = (WIDTH - width) * .5;
const step = HEIGHT / 15;
let y = 0;
while (y < HEIGHT) {
context.fillRect(
x,
y + step * .25,
width,
step * .5
);
y += step;
}
context.fillStyle = '#FFF';
context.fillText(`WIN: ${win} / LOSE: ${lose}`, 10, canvas.height - 10);
context.restore();
}
main();
</script>
</body>
</html>