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zombiesimulator.html
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<!DOCTYPE html>
<html>
<head></head>
<body></body>
<script>
var canvas=document.createElement("canvas");
canvas.height=window.innerHeight-40
canvas.width=window.outerWidth-20
var c = canvas.getContext("2d");
var w=canvas.width
var h=canvas.height
var timeStep = 30; // In milliseconds
function getRandom(min, max) {
return Math.random() * (max - min) + min;
}
class GameObject{
constructor(x,y,height,width,color){
this.x=x;
this.y=y-height/2;
this.height = height;
this.width = width;
this.color=color;
}
prestroke(){
c.beginPath();
c.lineWidth = this.width;
c.strokeStyle = this.color;
}
stroke(){
c.rect(this.x,this.y,this.width, this.height);
}
poststroke(){
c.stroke();
}
}
class Bullet extends GameObject{
constructor(x,y,speed,direction,target){
super(x,y,1,1,"#ffcc00") //yellow color
this.speed=speed;
this.direction=direction;
this.target=target;
}
update(){
this.x+=Math.cos(this.direction)*this.speed;
this.y+=Math.sin(this.direction)*this.speed;
if(this.x<0 || this.y <0 || this.x > w || this.y > h)
return true;
else
return this.checkCollision(this.target);
}
checkCollision(humanoids){
for(let list in humanoids){
for(let humanoid of humanoids[list]){
const x=this.x-humanoid.x;
const y=this.y-humanoid.y;
if(Math.abs(x)<humanoid.width && Math.abs(y) < humanoid.height){
humanoid.health--;
return true;
}
}
}
return false;
}
}
class Humanoid extends GameObject{
constructor(size,x,y,color,health,speed) {
super(x,y,size,size,color);
this.height = size*2;
this.width = size;
this.target=null;
this.maxhealth = health;
this.health = this.maxhealth;
this.maxspeed=speed;
this.speed=this.maxspeed;
this.vision=100**2;
}
move(dir){
this.x+=Math.cos(dir)*this.speed;
this.y+=Math.sin(dir)*this.speed;
}
update(){
this.speed=this.maxspeed*this.health/this.maxhealth;
}
getTarget(humanoids){
if(this.target==null)var max=this.vision;
else var max=(this.x-this.target.x)**2+(this.y-this.target.y)**2;//Math.hypot(this.x-this.target.x,this.y-this.target.y);
for(let list in humanoids){
for(let humanoid of humanoids[list]){
const x=this.x-humanoid.x;
const y=this.y-humanoid.y;
const d=(x)**2+(y)**2;
if(d<max){
max=d;
this.target=humanoid;
}
}
}
}
}
class Player extends Humanoid{
constructor(size,x,y,health,speed){
super(size,x,y,"black",health,speed)
}
checkpos(){
//don't move outside canvas area
this.x=Math.max(0,Math.min(w-this.width,this.x));
this.y=Math.max(0,Math.min(h-this.height,this.y));
}
update(){
super.update();
//check keypress
let l=0;
let v=0;
if(game.keys[87])v--;//w
if(game.keys[65])l--;//a
if(game.keys[83])v++;//s
if(game.keys[68])l++;//d
if(l || v){
this.move(Math.atan2(v,l));
this.checkpos();
}
}
}
class Zombie extends Humanoid{
constructor(size,x,y,health,speed){
super(size,x,y,"green",health,speed)
}
checkpos(){
//don't move outside canvas area
this.x=Math.max(0,Math.min(w-this.width,this.x));
this.y=Math.max(0,Math.min(h-this.height,this.y));
}
update(){
super.update();
if(this.target==null || this.target.health<=0){
this.target=null;
this.getTarget(game.humans);
}
if(this.target!=null){
const x=this.target.x-this.x;
const y=this.target.y-this.y;
if(Math.abs(x)<this.width && Math.abs(y) < this.height) this.target.health--;
else this.move(Math.atan2(y,x));
}else{
this.move(getRandom(-Math.PI,Math.PI));
this.checkpos();
}
}
}
class Civilian extends Humanoid{
constructor(x,y,health){
super(4,x,y,"#ecbcb4",health,1) //skin color
}
update(){
super.update();
this.getTarget(game.undead);
if(this.target==null){
this.move(getRandom(-Math.PI,Math.PI));
}else{
let x=this.target.x-this.x;
let y=this.target.y-this.y;
this.move(Math.atan2(-y,-x));
}
}
}
class Police extends Humanoid{
constructor(x,y,health){
super(4,x,y,"#33ccff",health,1) //blue color
this.range=this.vision/2;
this.reloadtime=10;
this.reload=0;
}
shoot(dir){
game.bullets.push(new Bullet(this.x,this.y,4,dir,game.undead));
}
update(){
super.update();
if(this.target?.health<=0)
this.target=null;
this.getTarget(game.undead);
if(this.target==null){
this.move(getRandom(-Math.PI,Math.PI));
}else{
const x=this.target.x-this.x;
const y=this.target.y-this.y;
const d=(x)**2+(y)**2;
if(d<this.range){
if(this.reload==0){
this.reload=this.reloadtime;
this.shoot(Math.atan2(y,x))
}
else
this.reload--;
}
else this.move(Math.atan2(y,x));
}
}
}
class Game{
constructor() {
this.load();
this.undead={zombies:[],player:[]}
this.alive=0;
this.humans={civilians:[],police:[]}
this.bullets=[]
this.populate()
this.keys = [];
}
populate(){
const max=Math.min(20000,this.state.level*100);
const prob=max/20000
for(let i=0;i<max;i++){
const x=getRandom(w/4,w/4*3);
const y=getRandom(h/4,h/4*3);
const rand = Math.random() < prob;
if(rand){
this.humans.police.push(new Police(x,y,this.state.level*10,1));
this.alive++;
}else{
this.humans.civilians.push(new Civilian(x,y,this.state.level*10,1));
this.alive++;
}
}
}
changelevel(level){
this.state.level=level;
this.save();
this.bullets.splice(0,this.bullets.length);
this.populate();
this.undead.zombies.splice(2000,this.undead.zombies.length-2000);
for(let i=0;i<this.undead.zombies.length;i++){
const dir=getRandom(0,Math.PI/2);
const speed=getRandom(0,Math.min(w/4,h/4))
this.undead.zombies[i].x=Math.cos(dir)*speed;
this.undead.zombies[i].y=Math.sin(dir)*speed;
}
}
update(){
if(this.alive==0)this.changelevel(this.state.level+1)
for(let i=0;i<this.bullets.length;){
if(this.bullets[i].update()){
this.bullets.splice(i, 1);
}else{
i++;
}
}
for(let list in this.undead){
for(let i=0;i<this.undead[list].length;){
if(this.undead[list][i].health<=0){
this.undead[list].splice(i, 1);
}else{
this.undead[list][i].update();
i++;
}
}
}
for(let list in this.humans){
for(let i=0;i<this.humans[list].length;){
let human=this.humans[list][i]
if(human.health<=0){
this.undead.zombies[this.undead.zombies.length]= new Zombie(4,human.x,human.y,10,2);
this.humans[list].splice(i, 1);
this.state.killcount++;
this.alive--;
}else if(human.x<0 || human.y <0 || human.x > w || human.y > h){
human.health=0;
this.humans[list].splice(i, 1);
this.state.flee++;
this.alive--;
}else{
human.update();
i++;
}
}
}
if(!document.hidden)requestAnimationFrame(()=>game.stroke()); // for subsequent frames
}
strokeclass(list){
let first=list[0]
if(first){
first.prestroke();
for(let e of list){
e.stroke();
}
first.poststroke();
}
}
stroke(){
c.clearRect(0, 0, w, h);
for(let e in this.humans)this.strokeclass(this.humans[e])
for(let e in this.undead)this.strokeclass(this.undead[e])
this.strokeclass(this.bullets);
c.font = "20px Arial";
c.fillText("Humans killed: "+this.state.killcount, 10, 20);
c.fillText("Civilians evacuated: "+this.state.flee, 10, 40);
c.fillText("Level: "+this.state.level, 10, 60);
}
init(){
this.state={};
this.state.level=1;
this.state.killcount=0;
this.state.flee=0;
}
save(){
localStorage.setItem('state', JSON.stringify(this.state));
}
load(){
var saved = localStorage.getItem('state');
if(saved != null){
this.state = JSON.parse(saved);
}
else{
this.init();
}
}
}
document.body.innerHTML = "";
document.body.append(canvas)
var game=new Game();
canvas.onclick=function(e){
const rect = canvas.getBoundingClientRect();
const x = event.clientX - rect.left;
const y = event.clientY - rect.top;
game.undead.zombies[game.undead.zombies.length]= new Zombie(4,x,y,10,2);
}
window.addEventListener("keydown", function(e){
game.keys[e.keyCode] = true;
}, false);
window.addEventListener('keyup', function(e){
game.keys[e.keyCode] = false;
}, false);
var blob = new Blob (["setInterval(()=>self.postMessage('loop'), "+timeStep+");"]);
var workerScript = window.URL.createObjectURL(blob);
var worker = new Worker (workerScript);
worker.onmessage = ()=>game.update();
</script>
</html>