gistfile1.js

// Redistributable Slider Algorithm

var sliders = $('.slider');
var max = 350;

var slidernum = 3;

var sliderVals = [max/slidernum,max/slidernum,max/slidernum,max/slidernum,max/slidernum,max/slidernum,max/slidernum];
var amounts = [0,0,0,0,0,0,0]
var lockedSlider = 0;
function setSliderVals() {
  var json = [];
  for (var i = 0; i<sliders.length; i++) {
    var s = $(sliders[i]);
    sliderVals[i] = Math.floor(s.slider('value') / max * 100000000) / 1000000;
    var name = s.attr('name');
    json.push('"' + name + '":' + sliderVals[i]);
  }
  $('input[name=customamount]').val('{' + json.join(',') + '}');
}
var contribution = 0;
function recalculateSliders() {
  if (isNaN(contribution)) contribution = 0;
  var lockedval = 0;
  for (var i = 0; i<sliders.length; i++) {
    var s = $(sliders[i]);
    if (lockedSlider == i) lockedval = s.slider('value');
  }
  var sum = 0;
  for (var i = 0; i<sliders.length; i++) {
    if (lockedSlider == i) continue;
    sum += sliderVals[i];
  }
  var mult = (max - lockedval) / (sum)
  for (var i = 0; i<sliders.length; i++) {
    if (i == lockedSlider) continue;
    var s = $(sliders[i]);
    s.slider('value',sliderVals[i] * mult);
  }
  var moneysurplus = 0;
  var divvy = 0;
  for (var i = 0; i<sliders.length; i++) {
    var s = $(sliders[i]);
    var amt = (s.slider('value') / max) * contribution;
    if (s.slider('value') == 1) { amt = 0; divvy++; };
    amounts[i] = amt;
    moneysurplus += amt;
  }
  moneysurplus -= contribution;
  moneysurplus = moneysurplus / (sliders.length - divvy);
  for (var i = 0; i<sliders.length; i++) {
    var s = $(sliders[i]);
    if (s.slider('value') != 1) amounts[i] -= moneysurplus;
    s.parent().find('.slider_amount').text(format(amounts[i]));
  }
}