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038 keyup.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
const canvas = document.getElementById("game");
const context = canvas.getContext("2d");
canvas.width = window.innerWidth / 2;
canvas.height = window.innerHeight / 2;
let gameover = false;
let x = canvas.width / 2;
let y = canvas.height / 2;
let dx = 0;
let dy = 0;
const state = {
"ArrowRight": false,
"ArrowLeft": false,
"ArrowUp": false,
"ArrowDown": false
}
document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
function determineDirection() {
const {
ArrowRight,
ArrowLeft,
ArrowUp,
ArrowDown
} = state
if (ArrowRight && ArrowUp) {
return {
dx: .25,
dy: -.25
};
}
if (ArrowRight && ArrowDown) {
return {
dx: .25,
dy: .25
};
}
if (ArrowLeft && ArrowUp) {
return {
dx: -.25,
dy: -.25
};
}
if (ArrowLeft && ArrowDown) {
return {
dx: -.25,
dy: .25
};
}
if (ArrowLeft) {
return {
dx: -.25,
dy: 0
}
}
if (ArrowRight) {
return {
dx: .25,
dy: 0
}
}
if (ArrowUp) {
return {
dx: 0,
dy: -.25
}
}
if (ArrowDown) {
return {
dx: 0,
dy: .25
}
}
return {
dx: 0,
dy: 0
}
}
function keyDownHandler({
key
}) {
state[key] = true;
}
function keyUpHandler({
key
}) {
state[key] = false;
}
function draw() {
context.clearRect(0, 0, canvas.width, canvas.height);
context.beginPath();
context.arc(x, y, 10, 0, Math.PI * 2, false);
context.fillStyle = "red";
context.fill();
context.closePath();
}
function logic() {
const direction = determineDirection();
if (direction.dx) {
dx = dx + direction.dx
}
if (direction.dy) {
dy = dy + direction.dy
}
x = x + dx;
y = y + dy;
;
if (dx > 0) {
dx -= 0.02;
}
if (dx < 0) {
dx += 0.02;
}
if (dy > 0) {
dy -= 0.02;
}
if (dy < 0) {
dy += 0.02;
}
}
function play() {
draw();
logic();
}
setInterval(play, 50);
</script>
</head>
<body>
<canvas id="game"></canvas>
</body>
</html>