assignment 11

fun with rainfall

by Kristy Bond

HTML

Hello! Rainfall has been recorded for the past 6 hours. Input an hour and get the data recorded. For example if the current time is 3:00 pm and you wish to know what the rain fall was at 2:30 you would input 5.5
<input type="textbox" id="timeIn" value="5.5" size="4" />
<input type="button" value="Inquire Rainfall" onClick="getPercentage();" />
<br/>

<p id='reportOut'></p>

JavaScript

//create a computer program that uses the following lookup table (interpolation table), allows a user to input a number and calculates the answer by interpolating between 2 numbers – or finds an exact solution.


//The table gives the amount of total rainfall (normalized to 1) that occurred during a rainfall event. For example at hour 3, 0.6 or 60% of the total rain had fallen. You will need to create a function that allows me to enter a number between 0 and 6, and it must return the total amount of rainfall that has occurred. 


//fractions need to work too. (╯°□°）╯︵ ┻━┻)


var prntRainTable = '';
var prntCalc = '';;
var timeIn;

function getPercentage() {
  timeIn = document.getElementById("timeIn").value;


  prntCalc = 'Time Requested ' + timeIn + "<br/>";
  for (var i = 0; i < rainTable.length; i++) {
    nextKnownDataPoint = i + 1;

    if (i == timeIn) {
      prntCalc += 'for ' + timeIn + ': ' + rainTable[i] + "<br/>";
      break;
    }

    if (i > timeIn && i < nextKnownDataPoint) {

      prntCalc += ' > This falls between:' + rainTable[i - 1] + ' and ' + rainTable[i] + "<br/>";

      rangeInBetween = rainTable[i] - rainTable[i - 1];
      prntCalc += ' > Diffrence between the two inputs: ' + rangeInBetween + "<br/>";

      scaleInBetween = 1 - (i - timeIn);
      prntCalc += ' > Diffrence between the two indexes: ' + scaleInBetween + "<br/>";

      extrapolatedValue = rainTable[i - 1] * 1 + (rangeInBetween * scaleInBetween);
      extrapolatedValue = Math.ceil(extrapolatedValue * 1000) / 1000;
      prntCalc += '>Rainfall at Requested Hour: ' + extrapolatedValue + "<br/>";
      break;
    }


  }




  generateReport();
}

function generateReport() {
  prntRainTable = '';

  for (var i = 0; i < rainTable.length; i++) {

    prntRainTable += i + '&nbsp;&nbsp;&nbsp;' + rainTable[i] + "<br/>";
  }
  report = '';
  report += "<br/>";
  report += prntRainTable;
  report += "<br/>";
  report += prntCalc;


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