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script.js
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script.js
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const canvas = document.querySelector("canvas")
const ctx = canvas.getContext("2d")
const width = canvas.width; const height = canvas.height
const preloaderSprites = [
"img/bg_night.png","img/bg.png","img/base.png",
"img/pipe-green.png","img/australian-pipe.png",
"img/numbers/0.png","img/numbers/1.png","img/numbers/2.png","img/numbers/3.png","img/numbers/4.png","img/numbers/5.png","img/numbers/6.png","img/numbers/7.png","img/numbers/8.png","img/numbers/9.png",
"img/gameover.png",
"img/bird/frame1.png","img/bird/frame2.png","img/bird/frame3.png","img/bird/frame4.png",
"img/bird_yellow/frame1.png","img/bird_yellow/frame2.png","img/bird_yellow/frame3.png","img/bird_yellow/frame4.png",
"img/bird_red/frame1.png","img/bird_red/frame2.png","img/bird_red/frame3.png","img/bird_red/frame4.png",
]
var frame = 0
var loadedImages = {}
function loadAndGrabImage(url) {
if (loadedImages[url]) {
return loadedImages[url]
} else {
var image = document.createElement("img")
image.src = url
loadedImages[url] = image
return image
}
}
function resetGame() {
gameState = {
running: true,
position: 200,
x: 0,
score: 0,
pipes: [],
momentum: 0,
bgSprite: Math.random() < 0.75 ? "img/bg.png" : "img/bg_night.png",
birdSpriteSet: "img/bird_yellow/",
}
var rand = Math.random()
if (rand > 0.5) {
gameState.birdSpriteSet = "img/bird_red/"
}
if (rand > 0.75) {
gameState.birdSpriteSet = "img/bird/"
}
}
var gameState = {}
resetGame()
function botFrame() {
if (!botEnabled) {return}
var pipe = 0
if (gameState.pipes[pipe][0] < gameState.x + 50) {
pipe = 1
}
if (gameState.position > gameState.pipes[pipe][1] || gameState.position - gameState.momentum > 380 ) {
tap()
}
}
var botEnabled = false;
function tap(e) {
if (gameState.running) {
gameState.momentum = 50
gameState.running = true
document.querySelector("#wingSFX").play()
} else {
resetGame()
}
try { checkCheats(e.key) } catch(e) {console.error(e)}
}
function loseState() {
if (!gameState.running || invincible) { return }
document.querySelector("#hitSFX").play()
var stored = (localStorage.getItem("flappyHighScore"))
console.log(stored, gameState.score.toString())
if (!stored || parseInt(stored) < gameState.score) {
console.log("high score")
localStorage.setItem("flappyHighScore", gameState.score.toString())
}
gameState.running = false
}
var diffOffset = 50
function render() {
frame += 1
ctx.clearRect(0,0,width,height)
// tile bg
ctx.drawImage(loadAndGrabImage(gameState.bgSprite),-(gameState.x * 0.5) % 288,0)
ctx.drawImage(loadAndGrabImage(gameState.bgSprite),(-(gameState.x * 0.5) % 288) + 285,0)
ctx.drawImage(loadAndGrabImage(gameState.bgSprite),(-(gameState.x * 0.5) % 288) + 574,0)
// create pipe every 100 frames
if (gameState.x % 300 == 0) {
gameState.pipes.push([gameState.x + width, Math.floor(Math.random() * 250) + 75])
}
// scoring
if (gameState.x % 300 == 162) {
gameState.score += 1
document.querySelector("#pointSFX").play()
console.log(gameState.score)
}
//remove past pipes
while (gameState.pipes[0] && gameState.pipes[0][0] - gameState.x < -52) {
gameState.pipes.shift()
}
// pipes
for (var p of gameState.pipes) {
ctx.drawImage(loadAndGrabImage(`img/pipe-green.png`),p[0] - gameState.x,p[1] + diffOffset)
ctx.drawImage(loadAndGrabImage(`img/australian-pipe.png`),p[0] - gameState.x,p[1] - (diffOffset + 320))
// collision
//console.log(p[0] - gameState.x)
if ((p[0] - gameState.x < 132 && p[0] - gameState.x > 55) && // x axis collision
(
(gameState.position > p[1] + diffOffset) || // upper x axis collision
(gameState.position < p[1] - diffOffset) // lower y axis collision
) && gameState.running) {
document.querySelector("#dieSFX").play()
loseState()
}
}
// tile flooring
ctx.drawImage(loadAndGrabImage("img/base.png"),(-gameState.x % 336),400)
ctx.drawImage(loadAndGrabImage("img/base.png"),(-gameState.x % 336) + 336,400)
ctx.drawImage(loadAndGrabImage("img/base.png"),(-gameState.x % 336) + 672,400)
// gravity
gameState.momentum -= 2
// move flappy up and down
gameState.position -= Math.floor(gameState.momentum / 10)
// move stage to the left
if (gameState.running) {
gameState.x += 3
}
// collisions
if (gameState.position < 0 && !noclip) {
gameState.position = 0
} else if (gameState.position < 0) {
gameState.position = 512
}
if (gameState.position > 376 && !noclip) {
gameState.position = 376
loseState()
}
if (gameState.position > 512) {
gameState.position = -24
}
// draw flappy
ctx.drawImage(loadAndGrabImage(gameState.birdSpriteSet + `frame${(Math.floor(gameState.x / 12) % 4) + 1}.png`),100,gameState.position)
// game over text
if (!gameState.running) {
ctx.drawImage(loadAndGrabImage(`img/gameover.png`),width / 2 - (192 / 2),height / 2 - 41)
}
// score
var str = gameState.score.toString().split("")
var x = 0
while (str.length > 0) {
var i = str.shift()
ctx.drawImage(loadAndGrabImage(`img/numbers/${i}.png`),x,0)
if (i == "1") {
x += 16
} else {
x += 24
}
}
var str = (localStorage.flappyHighScore || 0).toString().split("")
var x = 0
while (str.length > 0) {
var i = str.shift()
ctx.drawImage(loadAndGrabImage(`img/numbers/${i}.png`),x,36)
if (i == "1") {
x += 16
} else {
x += 24
}
}
// preloader
var i = 0
for (var sprite of preloaderSprites) {
i += 24
ctx.drawImage(loadAndGrabImage(sprite),width + i ,0)
}
animFrame = requestAnimationFrame(render)
}
var animFrame = requestAnimationFrame(render)
setInterval(botFrame,50)
window.onkeydown = tap
canvas.onclick = tap