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game.html
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game.html
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<html>
<head>
<title>Simple Walker</title>
<style>
html,
body {
margin: 0;
background: black;
}
.field {
position: absolute;
width: 100dvw;
height: 100dvh;
overflow: hidden;
background-color: green;
background-image: url('./grass.jpg');
}
#kubik {
position: absolute;
width: 50px;
height: 100px;
}
#walker {
position: absolute;
background-image: url('./walker.gif');
width: inherit;
height: inherit;
z-index: 2;
}
.shadow {
display: flex;
position: absolute;
filter: blur(10px);
width: inherit;
height: inherit;
align-items: flex-end;
justify-content: center;
}
.init {
background-position-x: -140px;
}
.stop {
background-position-y: -28px;
}
.walk {
background-position-y: -148px;
}
.turn00 {
background-position-x: -140px;
}
.turn01 {
background-position-x: -140px;
}
.turn11 {
background-position-x: -197px;
}
.turn10 {
background-position-x: -250px;
}
.turn1-1 {
background-position-x: -303px;
}
.turn0-1 {
background-position-x: -358px;
}
.turn-1-1 {
background-position-x: -412px;
}
.turn-10 {
background-position-x: -30px;
}
.turn-11 {
background-position-x: -84px;
}
.atlas {
position: absolute;
background-image: url('./atlas.png');
width: 0;
height: 0;
overflow: hidden;
}
.atlas.hidden {
display: none;
}
.atlas.back {
z-index: 1;
}
.atlas.front {
z-index: 3;
}
.atlas.tree1 {
width: 120px;
height: 190px;
background-position: 0px 0px;
opacity: 0.9;
}
.atlas.tree2 {
width: 120px;
height: 190px;
background-position: -130px 0px;
opacity: 0.9;
}
</style>
</head>
<body>
<div class="field">
<div id="kubik">
<div class="shadow">▄</div>
<div id="walker" class="init stop"></div>
</div>
</div>
<script>
const tick = () => new Promise(resolve => setTimeout(resolve));
// --- [GAMEPLAY] SETUP ---
const keys = {
"ArrowDown": { dy: 1 },
"ArrowUp": { dy: -1 },
"ArrowLeft": { dx: -1 },
"ArrowRight": { dx: 1 },
"ShiftLeft": { ds: 2 },
"ShiftRight": { ds: 0.25 }
}
let elements = {}
let setup = {}
const calculateSetup = () => {
elements = {
field: document.getElementsByClassName("field")?.[0],
kubik: document.getElementById("kubik"),
walker: document.getElementById("walker")
}
setup = {
screenSize: elements.field.getBoundingClientRect(),
kubikSize: elements.kubik.getBoundingClientRect()
}
setup.screenLimit = {
width: setup.screenSize.width - setup.kubikSize.width,
height: setup.screenSize.height - setup.kubikSize.height
}
}
calculateSetup()
window.onresize = calculateSetup
// --- [SPRITES] SETUP ---
const playerSize = {
width: 35,
height: 90
}
const mapSize = {
width: 100,
height: 50
}
const sprites = {
tree1: {
className: "tree1",
tall: true,
width: 3,
height: 2,
base: -10,
thru: false
},
tree2: {
className: "tree2",
tall: true,
width: 3,
height: 2,
base: -10,
thru: false
}
}
let fieldMap = []
do {
const x = Math.floor(Math.random() * mapSize.width - mapSize.width / 2) * sprites.tree1.width * playerSize.width
const y = Math.floor(Math.random() * mapSize.height - mapSize.height / 2) * sprites.tree1.height * playerSize.height
const anyTree = [sprites.tree1, sprites.tree2]
if (!fieldMap.some((item) => item.x == x && item.y == y))
fieldMap.push({
id: `tree-${fieldMap.length}`,
origin: anyTree[Math.floor(Math.random() * anyTree.length)],
x,
y
})
} while (fieldMap.length < (mapSize.width * mapSize.height) / 5)
console.log(fieldMap)
let spritesMap = []
const renderSprites = () => {
const printSprite = (sprite) => {
let preSprite = document.createElement('div')
preSprite.id = `${sprite.id}`
preSprite.className = `atlas ${sprite.origin.className}`
preSprite.setAttribute("tall", sprite.origin.tall)
preSprite.setAttribute("coord-left", sprite.x)
preSprite.setAttribute("coord-top", sprite.y)
preSprite.setAttribute("coord-base", sprite.y + (sprite.origin.height - 1) * playerSize.height + sprite.origin.base)
elements.field.prepend(preSprite)
spritesMap.push(preSprite)
}
fieldMap.forEach((sprite) => {
printSprite(sprite)
})
}
renderSprites()
console.log(spritesMap)
const calculateSprites = ({ playerY, strafeX = 0, strafeY = 0 }) => {
spritesMap
.forEach((preSprite, i) => {
const coordLeft = parseInt(preSprite.getAttribute("coord-left") || 0)
const coordTop = parseInt(preSprite.getAttribute("coord-top") || 0)
const coordBase = parseInt(preSprite.getAttribute("coord-base") || 0)
preSprite.style.left = coordLeft + strafeX
preSprite.style.top = coordTop + strafeY
if ((coordBase + strafeY) < playerY) {
preSprite.classList.remove("front")
preSprite.classList.add("back")
}
else {
preSprite.classList.remove("back")
preSprite.classList.add("front")
}
})
}
// --- [INIT] PLAYER POSITION ---
let x = setup.screenSize.width / 2 - setup.kubikSize.width / 2,
y = setup.screenSize.height / 2 - setup.kubikSize.height / 2
const keysPressed = []
const calculateWalkerTurn = () => {
let lastdx = 0, lastdy = 0
keysPressed.forEach((key) => {
const delta = keys[key] || {}
lastdx += delta.dx || 0
lastdy += delta.dy || 0
})
walker.className = `${(Math.abs(lastdx) + Math.abs(lastdy) !== 0) ? "walk" : "stop"} turn${lastdx}${lastdy}`
}
document.addEventListener("keydown", (event) => {
console.log(event.code)
const delta = keys[event.code]
if (!delta || keysPressed.includes(event.code))
return
keysPressed.push(event.code)
calculateWalkerTurn()
})
document.addEventListener("keyup", (event) => {
const delta = keys[event.code]
if (!delta)
return
const keyIndex = keysPressed.indexOf(event.code)
if (keyIndex !== -1)
keysPressed.splice(keyIndex, 1)
calculateWalkerTurn()
})
let bx = 0, by = 0
const playAnimation = () => {
let dx = 0, dy = 0, ds = 1
keysPressed.forEach((key) => {
const delta = keys[key]
dx += (delta?.dx || 0)
dy += (delta?.dy || 0)
ds = (delta?.ds || ds)
})
x += dx * ds
y += dy * ds
if (x < 0 || x > setup.screenLimit.width)
bx -= dx * ds
if (y < 0 || y > setup.screenLimit.height)
by -= dy * ds
calculateSprites({ playerY: y, strafeX: bx, strafeY: by })
elements.field.style.backgroundPositionX = `${bx}px`
elements.field.style.backgroundPositionY = `${by}px`
x = Math.max(Math.min(x, setup.screenLimit.width), 0)
y = Math.max(Math.min(y, setup.screenLimit.height), 0)
elements.kubik.style.left = `${x}px`
elements.kubik.style.top = `${y}px`
requestAnimationFrame(playAnimation)
}
playAnimation()
</script>
</body>
</html>