Predict max population

[Gousgounis]

A simple calculation that will predict when our city hall will be full of citizens, using the current growth rate.
If the growth rate is not sufficient to fill the city then display the predicted max population.
This could be very useful to know when a tavern upgrade is needed.

each new citizen reduces the growth rate by 0.02 so a town reaches the maximum population when growth rate <0.02

Sample code from http://userscripts.org/scripts/show/25813

Code: Select all

   var divCityOverview, curPopulation, maxPopulation, curPopulationGrowth, timeLeftEx;
   
   divCityOverview = document.getElementById('CityOverview');
   if (divCityOverview) {
      curPopulation      = Number(divCityOverview.childNodes[3].childNodes[3].childNodes[1].childNodes[1].textContent);
      maxPopulation      = Number(divCityOverview.childNodes[3].childNodes[3].childNodes[1].childNodes[3].textContent);
      curPopulationGrowth   = Number(divCityOverview.childNodes[3].childNodes[3].childNodes[3].childNodes[3].textContent);
//curPopulationGrowth    is NaN on 0.3.2 using this method (sorry I don't understand childNodes yet!)
      alert(curPopulation+' '+maxPopulation+' '+curPopulationGrowth);
      if (curPopulation > 0 && maxPopulation > 0 && curPopulationGrowth > 0 && curPopulationGrowth / 0.02 + curPopulation >= maxPopulation) {
         timeLeftEx = 0;
         for (i = curPopulation; i < maxPopulation; i++) {
            timeLeftEx = timeLeftEx + 1 / (curPopulationGrowth - 0.02 * (i - curPopulation));
         };
      } else {
         timelLeftEx = Infinity;
      }
      var parentNode = divCityOverview.childNodes[3].childNodes[3];
      var newNode = parentNode.childNodes[3].cloneNode(true);
      var insertedElement = parentNode.appendChild(newNode);
      insertedElement.style.position = "relative";
      insertedElement.style.top = "90px";
      insertedElement.innerHTML = 'Full' + timeRealToString(timeLeftEx);

function timeRealToString(rTime) {
   var sDays, sHours, sMinutes, sResult;
   if (isFinite(rTime)) {
      sDays = Math.floor(rTime / 24);
      sHours = Math.floor(rTime - sDays * 24);
      sMinutes = Math.floor((rTime - sDays * 24 - sHours) * 60);
      sResult = (sDays == 0)?"":String(sDays) + 'd';
      sResult += (sHours == 0)?"":String(sHours) + 'h';
      sResult += sMinutes + 'm';
   } else {
      sResult = 'Never';
   }
   return sResult;