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engine.js
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engine.js
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var dRate = 8, //deaths per thousand people per year
bRate = 1.6, //children per woman
immigration = 110000, //immigrants per year
year = 2017, //starting year of simulation
lFertilityLimit = 20,//age where simulated people start becoming mothers
uFertilityLimit = 40, //ending age for this process
deaths = 0,
births = 0;
//lang data:
class LangData {
constructor(year, years, deaths, births, pop, deathrate, birthrate, immigration, pyramid, stats, options, lang, credits) {
this.year = year;
this.years = years;
this.deaths = deaths;
this.births = births;
this.pop = pop;
this.deathrate = deathrate;
this.birthrate = birthrate;
this.immigration = immigration;
this.pyramid = pyramid;
this.stats = stats;
this.options = options;
this.lang = lang;
this.credits = credits;
}
}
var en = new LangData(
"Year",
"Years",
"Deaths",
"Births",
"Population",
"Fatality Rate",
"Fertility Rate",
"Immigration",
"Population Pyramid",
"Overall Stats",
"Options",
"Language",
"by HoubkneghteS (Adam Simons)"
);
var de = new LangData(
"Jahr",
"Jahre",
"Gestorbene",
"Geborene",
"Bevölkerung",
"Sterberate",
"Geburtenrate",
"Einwanderung",
"Bevölkerungspyramide",
"Gesamtstatistiken",
"Optionen",
"Sprache",
"von HoubkneghteS (Adam Simons)"
);
var ni = new LangData(
"Jír",
"Jírs",
"Gedodtets",
"Gebornets",
"Lodtael",
"Dodraet",
"Geberþraet",
"Immegratjon",
"Lodtaeldíagram",
"Geþerinfos",
"Optjons",
"Spagh",
"fom HoubkneghteS (Adam Simons)"
);
//population array -- year by year
var pop = [
680000,
590000,
510000,
498000,
480000,
490000,
500000,
580000,
620000,
680000,
700000,
720000,
760000,
760000,
760000,
800000,
900000,
850000,
700000,
820000,
850000,
800000,
700000,
700000,
950000,
1050000,
1050000,
1230000,
1100000,
1200000,
1180000,
1200000,
1010000,
1090000,
1210000,
1480000,
1510000,
1810000,
1970000,
1850000,
1610000,
1400000,
1300000,
1250000,
1110000,
1100000,
1170000,
1000000,
1020000,
1170000,
1150000,
960000,
990000,
950000,
900000,
960000,
700000,
550000,
400000,
300000,
450000,
500000,
600000,
630000,
700000,
660000,
600000,
600000,
600000,
600000,
600000,
600000,
600000,
600000,
600000,
600000,
600000,
600000,
380000,
350000,
260000,
190000,
170000,
170000,
150000,
150000,
150000,
120000,
110000,
110000,
70000,
50000,
40000,
59000,
60000,
20000,
10000,
9000,
4500,
4000,
4000
];
//inner html function
function innerHtml(id, content) {
document.getElementById(id).innerHTML = content;
}
//width thml function
function widthHtml(id, width) {
document.getElementById(id).style.width = width + "%";
}
//sum for population
function sum(start, end) {
var sumStart = start || 0;
var sumEnd = end || pop.length;
var total = 0;
for (var i = sumStart; i < sumEnd; i++) {
total = total + pop[i];
}
return total;
}
//changing birth rate
function bChange(number) {
bRate += number;
if (bRate < 0) bRate = 0;
render();
}
//changing immigration
function imChange(number) {
immigration = number;
render();
}
//changing death rate
function dChange(number) {
dRate += number;
if (dRate < 0) dRate = 0;
render();
}
//stuff that only must be set up once
function start(lang) {
if (lang == "en") r = en;
else if (lang == "de") r = de;
else r = ni;
innerHtml("poppyramid", r.pyramid);
innerHtml("stats", r.stats);
innerHtml("options", r.options);
innerHtml("y1", `1 ${r.year}`);
innerHtml("y2", `2 ${r.years}`);
innerHtml("y5", `5 ${r.years}`);
innerHtml("birthrate2", r.birthrate);
innerHtml("deathrate2", r.deathrate);
innerHtml("immigration2", r.immigration);
innerHtml("lang", r.lang);
innerHtml("credits", r.credits);
render(); //renders dynamic values
}
//rendering the data
function render() {
//population tree
for (var i = 0; i < 100; i += 5) {
innerHtml(i, "<span id='plabel'>" + sum(i, i + 4) + ` (${i}-${i + 4})` + "</span>");
widthHtml(i, (sum(i, i + 4) > 0) ? 1 + sum(i, i + 4) / sum(0, pop.length) * 350 : "1")
}
innerHtml("100", "<span id='plabel'>" + pop[100] + " (100+)</span>");
widthHtml("100", (pop[100] > 0) ? 1 + pop[100] / sum(0, pop.length) * 350 : "1");
//overall stats
innerHtml("death", `<b>${r.deaths}:</b> ${deaths}`);
innerHtml("birth", `<b>${r.births}:</b> ${births}`);
innerHtml("total", `<b>${r.pop}:</b> ${sum()}`);
innerHtml("drate", `<b>${r.deathrate}:</b> ${dRate.toFixed(1)}`);
innerHtml("brate", `<b>${r.birthrate}:</b> ${bRate.toFixed(1)}`);
innerHtml("immigration", `<b>${r.immigration}:</b> ${immigration}`);
innerHtml("year", year);
}
//simulates years
function simulate(x) {
for (var n = 0; n < x; n++) {
//ages population by 1 year
for (var i = 99; i >= 0; i--) {
pop[i + 1] += pop[i];
pop[i] = 0;
}
var oldPop = sum(0, pop.length);
//polynomial death rate equation
for (var i = 0; i <= 100; i++) {
pop[i] = Math.floor(pop[i] * (1 - dRate * (0.0000000000000015 * Math.pow(i - 18, 7) + dRate * 0.00007)));
}
deaths = oldPop - sum(0, pop.length); //calculates number of deaths
var deathPop = sum(0, pop.length);
//simulates births
var mothers = 0;
for (var i = lFertilityLimit; i <= uFertilityLimit; i++) {
mothers += pop[i] / 2;
}
pop[0] += Math.ceil(mothers * bRate / (uFertilityLimit - lFertilityLimit)); //adds number to infant population
births = sum(0, pop.length) - deathPop; //calculates number of births
//calculates immigration
for (var i = 20; i <= 40; i++) {
pop[i] += Math.round(immigration / 20);
}
for (var i = 0; i <= 100; i++) {
if (pop[i] < 0) pop[i] = 0; //extreme case fixer
}
year++; //increments year
}
render();
}