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https://github.com/osmarks/website
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414
experiments/emu-war/index.html
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414
experiments/emu-war/index.html
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---
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title: Emu War
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description: Survive as long as possible against emus and other wildlife. Contributed by Aidan.
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---
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<span style="position: fixed">
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<span id="bar">
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</span>
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<span id="text">
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</span>
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</span>
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<div id="screen">
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</div>
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<div>
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<button onclick="lastIns='r';mainLoop()">←</button>
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<div style="display: inline-block"</div>
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<button onclick="lastIns='u';mainLoop()">↑</button>
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<button onclick="lastIns='d';mainLoop()">↓</button>
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</div>
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<button onclick="lastIns='l';mainLoop()">→</button>
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</div>
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<script type="text/javascript">
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const WIDTH = 30
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const HEIGHT = 20
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const genTable = (x, y, width, height) => {
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let tbody = document.createElement("tbody")
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tbody.style = "width:50%;display:block;margin:auto;font-size:0.75rem"
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for (let row = 0; row < y; row++) {
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let tr = document.createElement("tr")
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for (let col = 0; col < x; col++) {
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let th = document.createElement("th")
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th.innerHTML = " "
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th.style = "width:" + width + ";height:" + height
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tr.appendChild(th)
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}
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tbody.appendChild(tr)
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}
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return tbody
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}
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const setPixel = (elem, x, y, val) => {
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elem.childNodes[1].childNodes[y].childNodes[x].innerHTML = val
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}
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const fillScreen = (elem, width, height, text) => {
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for (let x = 0; x < WIDTH; x++) {
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for (let y = 0; y < HEIGHT; y++) {
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setPixel(elem, x, y, text)
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}
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}
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}
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const writeToScreen = (elem, width, startx, starty, words) => {
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let nletter = 0
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let x = startx
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let y = starty
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while(nletter < words.length) {
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if (words[nletter] == '\n') {
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y++
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x=0
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nletter++
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continue
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}
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if (x >= width) {
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y++
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x=0
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}
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if (words[nletter] == ' ' && x==0) {
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nletter++
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continue
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}
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setPixel(elem, x, y, words[nletter])
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x++
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nletter++
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}
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}
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const say = (elem, text) => {
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elem.innerHTML += "<br>" + text
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}
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const clear = (elem) => {
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elem.innerHTML = ""
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}
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const clamp = (x, max, min) => {
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if (x >= max) return max
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else if (x <= min) return min
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else return x
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}
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let screen = document.getElementById("screen")
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let saybox = document.getElementById("text")
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let bar = document.getElementById("bar")
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screen.style = "font-size:1rem;font-family:monospace"
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let tablescreen = genTable(WIDTH, HEIGHT, "1rem", "1.125rem")
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screen.appendChild(tablescreen)
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const startDesc = document.createElement("div")
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screen.appendChild(startDesc)
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startDesc.innerHTML = `Welcome to Aidan's RPG thing!
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<br>
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You are an intrepid explorer who got lost in a cavernous cavern, infested with all sorts of dangerous critters, from rats to\nmighty ogres.
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<br>
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You cannot survive, but how many foes will you take with you?
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<br>
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Use WASD or buttons to move and attack, and 'r' to\nrestart.
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<br>
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Press W, A, S or D to begin.`
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const enemy_icons = ["I", "K", "S", "E", "O", "R"]
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const enemy_names = ["ibis", "kestrel", "spider", "emu", "ogre", "rat"]
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const enemy_hp = [50, 30, 20, 80, 150, 15]
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const enemy_dmg_min = [04, 02, 02, 05, 005, 02]
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const enemy_dmg_range = [05, 15, 05, 20, 015, 05]
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const enemy_reward = [03, 02, 01, 04, 005, 01]
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const START_STR = 10
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let hp = 500
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let str = 0
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let score = 0
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let turns = 0
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let x = Math.floor(WIDTH / 2)
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let y = Math.floor(HEIGHT / 2)
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let lastIns = ""
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let base_dmg = 10
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let enemies = []
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let bonuses = []
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const restart = () => {
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hp = 500
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str = 0
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score = 0
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turns = 0
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x = Math.floor(WIDTH / 2)
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y = Math.floor(HEIGHT / 2)
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lastIns = ""
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base_dmg = 10
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enemies = []
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bonuses = []
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clear(bar)
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clear(saybox)
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fillScreen(screen, WIDTH, HEIGHT, " ")
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startDesc.style.display = "block"
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tablescreen.style.display = "none"
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}
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restart()
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const BONUS_HP = 128
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const BONUS_STR = 8
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const MAX_BONUS = 8
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const MAX_ENEMY = 24
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const BASE_SCALE_FACTOR = 0.5
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const gameOverMessage = "GAME OVER!"
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let modif = 1
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const calcModif = () => {
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modif = str / START_STR + 1
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}
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const encounter = (enemy_id) => {
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let enemy_dmg_done = Math.floor(enemy_dmg_min[enemy_id] + Math.random() * enemy_dmg_range[enemy_id] * modif)
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say(saybox, "A " + enemy_names[enemy_id] + " attacked and did " + enemy_dmg_done + " damage!")
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hp -= enemy_dmg_done
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}
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const spawnEnemy = (x, y, id) => {
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enemies.push({
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x: x,
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y: y,
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id: id,
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hp: Math.floor(enemy_hp[id] * modif),
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})
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}
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const spawnBonus = (x, y, hp, str, icon) => {
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bonuses.push({
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x: x,
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y: y,
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hp: hp,
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str: str,
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icon: icon,
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})
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}
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const drawEnemy = (enemy_index) => {
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const enemy = enemies[enemy_index]
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setPixel(screen, enemy.x, enemy.y, enemy_icons[enemy.id])
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}
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const drawBonus = (bonus_index) => {
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const bonus = bonuses[bonus_index]
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setPixel(screen, bonus.x, bonus.y, bonus.icon)
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}
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const pickupBonus = (bonus_index) => {
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const bonus = bonuses[bonus_index]
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if (bonus.x == x && bonus.y == y) {
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hp += bonus.hp
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str += bonus.str
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base_dmg += Math.floor(bonus.str * BASE_SCALE_FACTOR)
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say(saybox, "Gained " + bonus.hp + "hp and " + bonus.str + "str from pickup!")
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return true
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}
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return false
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}
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const drawPlayer = () => {
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setPixel(screen, x, y, "@")
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}
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const checkCollision = (enemy_index) => {
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let enemy = enemies[enemy_index]
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for (let i = 0; i < enemies.length; i++) {
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if (i == enemy_index) continue
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let other = enemies[i]
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if (other.x == enemy.x && other.y == enemy.y) return true
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}
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return (enemy.x == x && enemy.y == y)
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}
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const getEnemy = (x, y) => {
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for (let i = 0; i < enemies.length; i++) {
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let other = enemies[i]
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if (other.x == x && other.y == y) return i
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}
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return -1
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}
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const canAttackPlayer = (enemy_index) => {
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let enemy = enemies[enemy_index]
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return enemy.x == x && enemy.y == y
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}
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const moveEnemy = (enemy_index) => {
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let enemy = enemies[enemy_index]
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let px = enemy.x
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let py = enemy.y
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let dx = x - enemy.x
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let dy = y - enemy.y
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if (Math.random() > 0.75 || dx*dx + dy*dy > 36) {
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dx = Math.random() - 0.5
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dy = Math.random() - 0.5
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}
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if (Math.abs(dx) > Math.abs(dy)) {
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enemy.x += Math.sign(dx)
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} else {
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enemy.y += Math.sign(dy)
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}
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enemy.x = clamp(enemy.x, WIDTH-1, 0)
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enemy.y = clamp(enemy.y, HEIGHT-1, 0)
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if (canAttackPlayer(enemy_index)) {
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encounter(enemies[enemy_index].id)
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}
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}
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const attack = (enemy_index) => {
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let done_dmg = base_dmg + Math.floor(Math.random() * (str + START_STR))
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enemies[enemy_index].hp -= done_dmg
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if (enemies[enemy_index].hp > 0) {
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say(saybox, "Attacked " + enemy_names[enemies[enemy_index].id] + " and did " + done_dmg + " damage! It now has " + enemies[enemy_index].hp + "hp!")
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}
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}
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const handleInput = (ins) => {
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let lookX = x
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let lookY = y
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if (ins == "u") {
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lookY += -1
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} else if (ins == "d") {
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lookY += 1
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} else if (ins == "l") {
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lookX += 1
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} else {
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lookX += -1
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}
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lookX = clamp(lookX, WIDTH-1, 0)
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lookY = clamp(lookY, WIDTH-1, 0)
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let id = getEnemy(lookX, lookY)
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if (id == -1) {
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x = lookX
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y = lookY
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} else {
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attack(id)
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if (enemies[id].hp < 0) {
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say(saybox, "Killed a " + enemy_names[enemies[id].id] + " gaining " + enemy_reward[enemies[id].id] + "str!")
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str += enemy_reward[enemies[id].id]
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base_dmg += Math.floor(enemy_reward[enemies[id].id] * BASE_SCALE_FACTOR)
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enemies.splice(id, 1)
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x = lookX
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y = lookY
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score++
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}
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}
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}
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const mainLoop = () => {
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if (hp <= 0) {
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return
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}
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turns++
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fillScreen(screen, WIDTH, HEIGHT, ".")
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startDesc.style.display = "none"
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tablescreen.style.display = "block"
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clear(saybox)
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calcModif()
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handleInput(lastIns)
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for (let i = 0; i < enemies.length; i++) {
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let origX = enemies[i].x
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let origY = enemies[i].y
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moveEnemy(i)
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if (checkCollision(i)) {
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enemies[i].x = origX
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enemies[i].y = origY
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}
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if (canAttackPlayer(i)) {
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encounter(enemies[i].id)
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}
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drawEnemy(i)
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}
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let toDel = []
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for (let i = 0; i < bonuses.length; i++) {
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if (pickupBonus(i)) {
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toDel.push(i)
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}
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drawBonus(i)
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}
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for (let i = 0; i < toDel.length; i++) {
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bonuses.splice(toDel[i], 1)
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}
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let freqModif = 1 / (0.5*str / START_STR + 1)
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if (Math.random() > 0.8 * freqModif && enemies.length <= MAX_ENEMY) {
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let randID = Math.floor(Math.random() * enemy_icons.length)
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let randX = Math.floor(Math.random() * WIDTH)
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let randY = Math.floor(Math.random() * HEIGHT)
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spawnEnemy(randX, randY, randID)
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}
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if (Math.random() > 0.75 && bonuses.length <= MAX_BONUS) {
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let randHP = Math.floor(Math.random() * BONUS_HP)
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let randStr = Math.floor(Math.random() * BONUS_STR)
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let randX = Math.floor(Math.random() * WIDTH)
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let randY = Math.floor(Math.random() * HEIGHT)
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spawnBonus(randX, randY, randHP, randStr, "?")
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}
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drawPlayer()
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clear(bar)
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say(bar, "HP: " + hp + " Str: " + (str + START_STR) + " Base dmg: " + base_dmg)
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say(bar, "Vanquished " + score + " foes.")
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say(bar, "Turn " + turns)
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if (hp <= 0) {
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if ("points" in window) {
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if (score >= 10) { points.unlockAchievement("emuwar10") }
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points.updateMetric("foesVanquished", function(x) { return x + score }, 0)
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points.updateMetric("deaths", function(x) { return x + 1 }, 0)
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}
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clear(saybox)
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say(saybox, gameOverMessage + " Press R to restart.")
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writeToScreen(screen, WIDTH, Math.floor(WIDTH/2 - gameOverMessage.length/2), Math.floor(HEIGHT/2)-1, gameOverMessage)
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}
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}
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document.addEventListener('keydown', function(event) {
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if(event.keyCode == 65) { // A
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lastIns = 'r'
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} else if(event.keyCode == 87) { // W
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lastIns = 'u'
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} else if(event.keyCode == 68) { // D
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lastIns = 'l'
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} else if(event.keyCode == 83) { // S
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lastIns = 'd'
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} else if(event.keyCode == 82) {
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restart()
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return
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} else {
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return
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}
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mainLoop()
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});
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function asyncDoLoop(fn) {
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setTimeout(() => {
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fn()
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setTimeout(() => asyncDoLoop(fn), 0)
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})
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}
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</script>
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Reference in New Issue
Block a user