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              * {
  box-sizing: border-box;  
}

svg {
  width: 100vw;
  background-color: rgba(10,20,0,0.03);
}

.bug-line {
  cursor: pointer;
  animation: .1s linear appears;
}

@keyframes appears {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}
            
          
!
            
              function getRandom2016Date(){
  return new Date(2016, Math.floor(Math.random()*100 % 11) +1, Math.floor(Math.random()*100 % 29) +1);
} 
var bugs = Array.from({length: 100}, function(){
  var d = getRandom2016Date();
  var bug = {
    id: (Math.floor(Math.random() * 1000000)),
    start : d,
    end: new Date(d.getTime() + (1000 * 60 * 60 * 24 * ((Math.floor(Math.random() * 100) + 1) % 45 ) ))
  }; 
  return bug;
}).sort((a,b) => a.start - b.start);

const COLORS = ["rgb(244, 67, 54)","rgb(233, 30, 99)","rgb(156, 39, 176)","rgb(103, 58, 183)","rgb(63, 81, 181)","rgb(33, 150, 243)","rgb(3, 169, 244)","rgb(0, 188, 212)","rgb(0, 150, 136)","rgb(76, 175, 80)","rgb(139, 195, 74)","rgb(255, 193, 7)","rgb(255, 152, 0)","rgb(255, 87, 34)","rgb(121, 85, 72)","rgb(96, 125, 139)"];



var svg = document.querySelector('svg');

const jan4 = new Date('2016-01-04');  
const X_PADDING = 17;
const LANE_HEIGHT = 10;
const BOTTOM = svg.viewBox.baseVal.height;
const MILLISECOND_A_DAY = (1000*60*60*24);
var lanes = [];


drawWeeks();
drawToday();
bugs.forEach(drawBug);

function drawBug(bug, idx){
  setTimeout(function(){
  var colorIndex = (bug.id % (COLORS.length - 1));
  var bugColor = COLORS[colorIndex];
  var startDayNumber = ((bug.start - jan4)/(1000*60*60*24));
  var endDayNumber = (((bug.end || new Date('2016-12-31')) - jan4)/MILLISECOND_A_DAY);
  
  var startPoint = X_PADDING + startDayNumber;
  var endPoint = X_PADDING + endDayNumber;
    
  var lane = findLane(startPoint,endPoint);
  if(!lanes[lane]){
    lanes[lane] = [];
  }
  lanes[lane].push([startPoint,endPoint]);
  var y = (lane + 1) * LANE_HEIGHT;
  var bugGroup = document.createElementNS("http://www.w3.org/2000/svg", "g");
  bugGroup.classList.add('bug-line'); 

  var bugLine = document.createElementNS("http://www.w3.org/2000/svg", "line");
  bugLine.setAttribute('x1', startPoint); 
  bugLine.setAttribute('y1', y);
  bugLine.setAttribute('x2', endPoint);
  bugLine.setAttribute('y2', y);
  bugLine.setAttribute('stroke', bugColor);
  bugLine.setAttribute('stroke-width', 2);
  bugLine.setAttribute('stroke-linecap', "round");
  bugGroup.appendChild(bugLine);
  
  if(bug.end){
    var endCircle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
    endCircle.setAttribute('cx',endPoint);
    endCircle.setAttribute('cy', y);
    endCircle.setAttribute('r', 2);
    endCircle.setAttribute('fill', bugColor);
    bugGroup.appendChild(endCircle);
  } 
  
  svg.appendChild(bugGroup);
  },idx * 50);
}

function drawWeeks(){
  for(var i = 0; i <= 52; i++){
    var weekLine = document.createElementNS("http://www.w3.org/2000/svg", "line");
    var x = X_PADDING + (i * 7);
    weekLine.setAttribute('x1', x);
    weekLine.setAttribute('y1', 0);
    weekLine.setAttribute('x2', x);
    weekLine.setAttribute('y2', BOTTOM);
    weekLine.setAttribute('stroke', 'rgba(0,0,0,0.3)');
    weekLine.setAttribute('stroke-width', 0.1);
    svg.appendChild(weekLine); 
  }
}

function drawToday(){
  var todayNumber = (((new Date()) - jan4)/MILLISECOND_A_DAY);
  var todayX = todayNumber + X_PADDING;

  var todayLine = document.createElementNS("http://www.w3.org/2000/svg", "line");
  todayLine.setAttribute('x1', todayX);
  todayLine.setAttribute('y1', 0);
  todayLine.setAttribute('x2', todayX);
  todayLine.setAttribute('y2', BOTTOM);
  todayLine.setAttribute('stroke', 'red');
  todayLine.setAttribute('stroke-width', 0.2);
  svg.appendChild(todayLine); 
}

function findLane(start, end){
  var lane = 0;
  var safe_space = 6;
  start = start - safe_space;
  end = end + safe_space;
  for(;lane < lanes.length;lane++){
    var fit = lanes[lane].every(function(xs){
      return !( 
        ( xs[0] >= start && xs[0] <= end ) ||
        ( start >= xs[0] && start <= xs[1] )
      );
    });
    if(fit === true){
      break;
    }
  }
  return lane;
}
            
          
!
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