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calculator.js
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var totalInfectionEstimate = 0.5;
var recoveryDays = 17;
var daysForTrend = 5;
function initData(initialData) {
var data = JSON.parse(JSON.stringify(initialData));
data.totals = [];
data.activeReal = [];
data.activeCalculated = [];
data.labels = [];
return data;
}
function getFiveDayGrowthRate(data) {
var trendTotal=0;
var rate=0;
for (i = 1; i < data.totalsInitial.length; i++) {
trendTotal+=i+1;
rate+= (data.totalsInitial[i] / data.totalsInitial[i - 1])*(i+1);
}
return rate / trendTotal;
}
function calculateTotals(currentTotal, fiveDayGrowthRate, maxPopulation, totalsInitial) {
var totals = JSON.parse(JSON.stringify(totalsInitial));
while (currentTotal < maxPopulation && totals.length < 1000) {
var previousTotal = currentTotal;
var smoothGrowthRate = ((fiveDayGrowthRate - 1) / maxPopulation * currentTotal);
var growthRate = fiveDayGrowthRate - smoothGrowthRate;
if (growthRate < 1.001) {
growthRate = 1.001;
}
currentTotal = Math.round(previousTotal * growthRate);
totals.push(currentTotal);
}
for (var i = 0; i < recoveryDays; i++) {
totals.push(currentTotal);
}
return totals;
}
function calculateActive(totals) {
var active = [];
for (i = 0; i < totals.length; i++) {
var recoveries = 0;
if (i > recoveryDays) {
recoveries = totals[i - recoveryDays];
}
active.push(totals[i] - recoveries);
}
return active;
}
function calculateLabels(startDate, length) {
var labels = [];
var currentDate = new Date(startDate);
for (var i = 0; i < length; i++) {
labels.push(currentDate.toLocaleDateString());
currentDate.setDate(currentDate.getDate() + 1);
}
return labels;
}
function calculateDates(startDate, length) {
var dates = [];
var currentDate = new Date(startDate);
for (var i = 0; i < length; i++) {
dates.push(new Date(currentDate));
currentDate.setDate(currentDate.getDate() + 1);
}
return dates;
}
function cutToSize(data, length) {
if (length < data.labels.length) {
data.labels = data.labels.slice(0, length);
data.activeReal = data.activeReal.slice(0, length);
data.activeCalculated = data.activeCalculated.slice(0, length);
}
}
function findHealthCareLimitIndex(activeCalculated, healthCareLimit) {
for (var i = 0; i < activeCalculated.length; i++) {
if (activeCalculated[i] > healthCareLimit) {
return i;
}
}
return activeCalculated.length - 1;
}
function findDateLimitIndex(dates, dateLimit) {
for (var i = 0; i < dates.length; i++) {
if (dates[i] > dateLimit) {
return i;
}
}
return dates.length - 1;
}
function calculate(initialData, dateLimit) {
var data = initData(initialData);
var fiveDayGrowthRate = getFiveDayGrowthRate(data);
console.info("5 day growth rate " + fiveDayGrowthRate);
var currentTotal = data.totalsInitial[data.totalsInitial.length - 1];
var maxPopulation = data.population * totalInfectionEstimate;
data.totals = calculateTotals(currentTotal, fiveDayGrowthRate, maxPopulation, data.totalsInitial);
currentTotal = data.totals[data.totals.length - 1];
data.activeCalculated = calculateActive(data.totals);
data.activeReal = data.activeCalculated.slice(0, data.totalsInitial.length);
data.labels = calculateLabels(initialData.startDate, data.totals.length);
var hcLimitIndex = findHealthCareLimitIndex(data.activeCalculated, data.healthCareLimit);
var dates = calculateDates(initialData.startDate, data.totals.length);
data.healthCareLimitDate = dates[hcLimitIndex];
data.healthCareLimitCalculated = data.totals[hcLimitIndex];
data.healthCareLimitIndex = hcLimitIndex;
var dateLimitIndex = findDateLimitIndex(dates, dateLimit);
cutToSize(data, dateLimitIndex);
console.info(data);
return data;
}