normal-politics/election_stats_2015.html at master · amirlb/normal-politics · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>תוצאות בחירות 2015</title>
<style>
  .rotate {
    -webkit-transform: rotate(-90deg);
    -moz-transform: rotate(-90deg);
    -ms-transform: rotate(-90deg);
    -o-transform: rotate(-90deg);
    filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=3);
  }
  #partiesList {
    list-style-type: none;
    width: 10em;
  }
  #partiesList li {
    border: 1px solid black;
    padding: 0.5em;
    margin: 0.25em;
    border-radius: 0.25em;
    background-color: #eee;
    cursor: move;
  }
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://rubaxa.github.io/Sortable/Sortable.js"></script>
<script>
  // With more than 10000 votes in the 2015 elections
  var partiesVoteCount = {
    "הליכוד": 985408,
    "המחנה הציוני": 786313,
    "הרשימה המשותפת": 446583,
    "יש עתיד": 371602,
    "כולנו": 315360,
    "הבית היהודי": 283910,
    "ש\"ס": 241613,
    "ישראל ביתנו": 214906,
    "יהדות התורה": 210143,
    "מרצ": 165529,
    "יחד": 125158,
    "עלה ירוק": 47180
  };

  function drawAxis(ctx, width, height)
  {
    ctx.beginPath();
    ctx.moveTo(0, height - 20);
    ctx.lineTo(width, height - 20);
    for (let i = -10; i <= 10; i++) {
      if ((Math.abs(i) <= 3) || ((Math.abs(i) % 2) == 1)) {
        ctx.moveTo(width/2 + i*80, height - 20);
        ctx.lineTo(width/2 + i*80, height - 15);
      }
    }
    ctx.strokeStyle = 'black';
    ctx.lineWidth = 0.5;
    ctx.stroke();
    ctx.fillStyle = 'black';
    ctx.textAlign = 'center';
    ctx.font = '10px sans';
    for (let i = -10; i <= 10; i++) {
      if ((Math.abs(i) <= 3) || ((Math.abs(i) % 2) == 1)) {
        ctx.fillText(i, width/2 + i*80, height - 5);
      }
    }
  }

  function drawCurve(ctx, width, height)
  {
    ctx.beginPath();
    ctx.moveTo(0, height - 20);
    for (let i = 1; i < width; i++) {
      let x = (i - width / 2) / 80.0;
      let y = Math.exp(-x*x / 2) / Math.sqrt(2 * Math.PI);
      j = height - 20 - y * (height - 50) * 2.5;
      ctx.lineTo(i, j);
    }
    ctx.strokeStyle = 'blue';
    ctx.lineWidth = 2;
    ctx.stroke();
  }

  /* Credit: DeepSpace101's post on Stack Overflow,
      http://stackoverflow.com/questions/8816729/javascript-equivalent-for-inverse-normal-function-eg-excels-normsinv-or-nor
  */
  function NormSInv(p) {
      var a1 = -39.6968302866538, a2 = 220.946098424521, a3 = -275.928510446969;
      var a4 = 138.357751867269, a5 = -30.6647980661472, a6 = 2.50662827745924;
      var b1 = -54.4760987982241, b2 = 161.585836858041, b3 = -155.698979859887;
      var b4 = 66.8013118877197, b5 = -13.2806815528857, c1 = -7.78489400243029E-03;
      var c2 = -0.322396458041136, c3 = -2.40075827716184, c4 = -2.54973253934373;
      var c5 = 4.37466414146497, c6 = 2.93816398269878, d1 = 7.78469570904146E-03;
      var d2 = 0.32246712907004, d3 = 2.445134137143, d4 = 3.75440866190742;
      var p_low = 0.02425, p_high = 1 - p_low;
      var q, r;
      var retVal;

      if (p <= 0) {
          retVal = -50.0;
      }
      else if (p >= 1)
      {
          retVal = 50.0;
      }
      else if (p < p_low)
      {
          q = Math.sqrt(-2 * Math.log(p));
          retVal = (((((c1 * q + c2) * q + c3) * q + c4) * q + c5) * q + c6) / ((((d1 * q + d2) * q + d3) * q + d4) * q + 1);
      }
      else if (p <= p_high)
      {
          q = p - 0.5;
          r = q * q;
          retVal = (((((a1 * r + a2) * r + a3) * r + a4) * r + a5) * r + a6) * q / (((((b1 * r + b2) * r + b3) * r + b4) * r + b5) * r + 1);
      }
      else
      {
          q = Math.sqrt(-2 * Math.log(1 - p));
          retVal = -(((((c1 * q + c2) * q + c3) * q + c4) * q + c5) * q + c6) / ((((d1 * q + d2) * q + d3) * q + d4) * q + 1);
      }
      return retVal;
  }

  function drawAreas(ctx, width, height, parties)
  {
    var totalVotes = 0.0;
    for (let i = 0; i < parties.length; i++) {
      totalVotes += partiesVoteCount[parties[i]];
    }

    var start = 0.0, end = 0.0;
    var color = '#bbf';
    for (let i = 0; i < parties.length; i++) {
      let partyName = parties[i];

      // figure out start and end
      start = end;
      end += partiesVoteCount[partyName] / totalVotes;
      startX = NormSInv(start);
      endX = NormSInv(end);

      // fill background color
      ctx.beginPath();
      ctx.moveTo(width/2 + startX * 80, height - 20);
      for (let x = startX; x < endX; x += 0.01) {
        let y = Math.exp(-x*x / 2) / Math.sqrt(2 * Math.PI);
        ctx.lineTo(width/2 + x * 80, height - 20 - y * (height - 50) * 2.5);
      }
      ctx.lineTo(width/2 + endX * 80, height - 20);
      ctx.fillStyle = color;
      ctx.lineWidth = 0;
      ctx.fill();
      color = (color === '#bbf') ? '#ddf' : '#bbf';

      // draw separating line
      ctx.beginPath();
      ctx.moveTo(width/2 + startX * 80, height - 20);
      let startY = Math.exp(-startX*startX / 2) / Math.sqrt(2 * Math.PI);
      ctx.lineTo(width/2 + startX * 80, height - 20 - startY * (height - 50) * 2.5);
      ctx.strokeStyle = 'blue';
      ctx.lineWidth = 1;
      ctx.stroke();

      // name of the party
      ctx.fillStyle = 'black';
      ctx.font = '14px sans';
      let left = Math.max(startX, Math.min(-2, endX - 1));
      let right = Math.min(endX, Math.max(2, startX + 1));
      let textX = (left + right) / 2;
      let textY = Math.exp(-textX*textX / 2) / Math.sqrt(2 * Math.PI);
      if (endX < 0) {
        ctx.textAlign = 'right';
        ctx.fillText(partyName, width/2 + textX * 80, height - 30 - textY * (height - 50) * 2.5);
      } else if (startX > 0) {
        ctx.textAlign = 'left';
        ctx.fillText(partyName, width/2 + textX * 80, height - 30 - textY * (height - 50) * 2.5);
      } else {
        ctx.textAlign = 'center';
        ctx.fillText(partyName, width/2 + textX * 80, 10);
      }
    }
  }

  function updateDisplay()
  {
    $('#canvas').attr('width', $(window).width() - 30);
    $('#canvas').attr('height', Math.min($(window).height() * 0.75 - 30, Math.min($(window).width()*2/3 - 20, 500)));

    var canvas = document.getElementById('canvas');
    var ctx = canvas.getContext('2d');
    ctx.clearRect(0, 0, canvas.width, canvas.height);

    var parties = [];
    $('#partiesList li').each(function(elt) {parties.push($(this).text());});
    drawAreas(ctx, canvas.width, canvas.height, parties);
    drawAxis(ctx, canvas.width, canvas.height);
    drawCurve(ctx, canvas.width, canvas.height);
  }

  $(function() {
    $(window).resize(function() {
      updateDisplay();
    });
    updateDisplay();
    Sortable.create(document.getElementById('partiesList'),
                    {onUpdate: updateDisplay});
  })
</script>
</head>
<body>
<h1 style="text-align: center">בחירות 2015</h1>
<div style="text-align: center">
  <canvas id="canvas"></canvas>
  <div>סטיות תקן</div>
</div>
<div style="direction: rtl">
  <ul id="partiesList">
    <li>הרשימה המשותפת</li>
    <li>עלה ירוק</li>
    <li>מרצ</li>
    <li>המחנה הציוני</li>
    <li>יש עתיד</li>
    <li>כולנו</li>
    <li>יהדות התורה</li>
    <li>הליכוד</li>
    <li>ש"ס</li>
    <li>ישראל ביתנו</li>
    <li>הבית היהודי</li>
    <li>יחד</li>
  </ul>
</div>
</body>
</html>