I've been working on creating a JavaScript game and am currently tackling the challenge of implementing gravity. One crucial aspect I need to address is creating an infinite loop without causing the browser to crash. Is there a way for me to include a break statement that only triggers under specific conditions?
Below is the current loop I have:
for (i = 0; i < Infinity; i++) {
if (moveY > 300) {
moveY = moveY - i * 2 + 3;
move(moveX, moveY);
} else {
i = 0;
}
}
When it comes to creating a game loop in JavaScript, the key is to avoid an infinite loop and instead utilize requestAnimationFrame
const p = document.querySelector('#p');
function gameloop(time) {
time *= 0.001; // convert to seconds
p.style.transform = `translate(${100 + Math.cos(time) * 100}px, ${100 + Math.sin(time) * 100}px)`;
requestAnimationFrame(gameloop);
}
requestAnimationFrame(gameloop);html, body {
height: 100%;
margin: 0;
overflow: hidden;
}
.sprite {
position: absolute;
left: 0;
top: 0;
background: red;
color: white;
border-radius: 1em;
padding: 0.5em;
}<div class="sprite" id="p">player</div>To handle input, events such as keyboard events come in handy.
const p = document.querySelector('#p');
let x = 100;
let y = 100;
let dir = 0.2;
const vel = 100; // 100 pixels per second
const turnSpeed = Math.PI; // half a turn per second
const keys = [];
let previousTime = 0;
function gameloop(currentTime) {
currentTime *= 0.001; // convert to seconds
deltaTime = currentTime - previousTime;
previousTime = currentTime;
if (keys[37]) dir -= turnSpeed * deltaTime;
if (keys[39]) dir += turnSpeed * deltaTime;
const dx = Math.cos(dir) * vel * deltaTime;
const dy = Math.sin(dir) * vel * deltaTime;
x = (x + dx + window.innerWidth) % window.innerWidth;
y = (y + dy + window.innerHeight) % window.innerHeight;
p.style.transform = `translate(${x}px, ${y}px) rotate(${dir}rad)`;
requestAnimationFrame(gameloop);
}
requestAnimationFrame(gameloop);
window.addEventListener('keydown', (e) => {
keys[e.keyCode] = true;
});
window.addEventListener('keyup', (e) => {
keys[e.keyCode] = false;
});html, body {
height: 100%;
margin: 0;
overflow: hidden;
}
.sprite {
position: absolute;
left: 0;
top: 0;
background: red;
color: white;
border-radius: 1em;
padding: 0.5em;
}<div class="sprite" id="p">player</div>
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