JSFiddle - React, Tailwind, and code Playground

by Michael Prosser

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="viewport-left">

</div>
<div class="viewport-right">

</div>

CSS

body{
  background-color:#666;
}
.viewport-left{
  position:fixed;
  left:0px;
  width:50%;
  top:0px;
  bottom:0px
}
.viewport-right{
  position:fixed;
  right:0px;
  width:50%;
  top:0px;
  bottom:0px
}

.radial-progress {
  transition:all 1s;
	width: 120px;
	height: 120px;
	border-radius: 50%;
	display: block;
	position:absolute;
  left:50%;
  top:50%;
  margin-left:-60px;
  margin-top:-60px;
}
.radial-progress.dock{
  top:10%;
}
.radial-progress:before {
    content: attr(data-remain);
    color: #fff;
    position: absolute;
    display: block;
    width: 50px;
    height:50px;
    text-align: center;
    left: 50%;
    top: 50%;
    margin-left:-25px;
    margin-top:-25px;
    z-index: 200;
    font-family: helvetica;
    font-size: 18px;
    line-height:50px;
    background:rgba(0,0,0,0.8);
    border-radius:50%;
}

.radial-progress .circle .mask,
.radial-progress .circle .fill,
.radial-progress .circle .shadow {
  width: 120px;
  height: 120px;
  position: absolute;
  border-radius: 50%;
}
.radial-progress .circle .shadow {
  box-shadow: 6px 6px 10px rgba(0, 0, 0, 0.2) inset;
}
.radial-progress .circle .mask,
.radial-progress .circle .fill {
  -webkit-backface-visibility: hidden;
  transition: -webkit-transform 1s;
  transition: -ms-transform 1s;
  transition: transform 1s;
  border-radius: 50%;
}
.radial-progress .circle .mask {
  clip: rect(0px, 120px, 120px, 60px);
}
.radial-progress .circle .mask .fill {
  clip: rect(0px, 60px, 120px, 0px);
  background-color: #ffcc00;
}
.radial-progress .inset {
  width: 90px;
  height: 90px;
  position: absolute;
  margin-left: 15px;
  margin-top: 15px;
  background-color: rgba(0,0,0,0.6);
  border-radius: 50%;
  box-shadow: 6px 6px 10px rgba(0, 0, 0, 0.2);
}
.radial-progress .inset .percentage {
  height: 22px;
  width: 57px;
  overflow: hidden;
  position: absolute;
  top: 34px;
  left: 16.5px;
  line-height: 1;
}
.radial-progress .inset .percentage .numbers {
  margin-top: -22px;
  transition: width...

JavaScript

var countdown = {
	
	seconds: 120,
	time: 120,
	
	timer: null,
	
	paused: false,
	
	counters: null,
	
	callback: function(){
		
		// default behaviour is player died
		alert("PLAYER DIED");
    clearInterval(countdown.timer);
		// kill player because time ran out
		//alert("Killed by timer");
		
	},
	
	create: function(){
		
		// counters start at 100%
		
		var counter1 = $('<div class="radial-progress" data-progress="100" data-remain="0"><div class="circle"><div class="mask full"><div class="fill"></div></div><div class="mask half"><div class="fill"></div><div class="fill fix"></div></div><div class="shadow"></div></div></div>');
		var counter2 = $('<div class="radial-progress" data-progress="100" data-remain="0"><div class="circle"><div class="mask full"><div class="fill"></div></div><div class="mask half"><div class="fill"></div><div class="fill fix"></div></div><div class="shadow"></div></div></div>');
		
		$('.viewport-left').append(counter1);
		$('.viewport-right').append(counter2);
		
		countdown.counters = $('.radial-progress');
		
    countdown.counters.attr('data-progress','100').attr('data-remain',countdown.time);
    
    countdown.start();
    
	},
	
	start: function(){
  
    setTimeout(function(){

			countdown.counters.addClass('dock');

    },3000);
  
		countdown.timer = setInterval(function(){
			
			if(!countdown.paused){
				
        countdown.time--;
        
        var elapsed = countdown.seconds - countdown.time;
        
				// get percentage based on time remaining
				
				var t = Math.round((countdown.time/countdown.seconds)*100);
				
        console.log(t);
				countdown.counters.attr('data-progress',t).attr('data-remain',countdown.time);
				
				if(countdown.time == 0){
					
					// time ran out
					countdown.callback();
					
				}
			
			}
			
		},1000);
		
	}, 
	
	pause: function(){
		
		countdown.paused = true;
		
	}, 
	
	resume: function(){
		
		countdown.paused = false;
		
	}
	
}

countdown.seconds = 300;
countdown.time =...