Gooey Effect - Circle

This example is from my blog on how to Create a Gooey effect during a transition and shows multiple gooey circles coming out of a center stationary circle and then falling back in

The other two examples

You can find even more gooey examples in my follow-up blog More fun data visualizations with the gooey effect

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/ >
	<title>Gooey Effect</title>

<div id="cont" class="container-fluid">
		<div class="row text-center">				
			<div class="col-sm-12 column text-center">
				<div class="chart"></div>
			</div>
		</div>
	</div>
	
	<script>
	
	////////////////////////////////////////////////////////////// 
	//////////////////////// Initiate //////////////////////////// 
	//////////////////////////////////////////////////////////////

var w = window,
		d = document,
		e = d.documentElement,
		g = d.getElementsByTagName('body')[0],
		x = w.innerWidth || e.clientWidth || g.clientWidth,
		totalHeight = w.innerHeight || e.clientHeight || g.clientHeight;
	
	var margin = {top: 30, right: 30, bottom: 30, left: 30};
		width = Math.min(500, (totalHeight - 20), $(".chart").width() - margin.left - margin.right);
		height = width;
		
	//Create scale
	var xScale = d3.scale.linear()
		.domain([-1.5, 1.5])
		.range([-width/2, width/2]);
	
	//Create SVG
	var svg = d3.select(".chart").append("svg")
		.attr("width", width + margin.left + margin.right)
		.attr("height", height + margin.top + margin.bottom)
	  .append("g")
		.style("filter", "url(#gooey)") //Set the filter on the container svg
		.attr("transform", "translate(" + (width/2 + margin.left) + "," +(height/2 +  margin.top) + ")");

//SVG filter for the gooey effect
	//Code taken from https://tympanus.net/codrops/2015/03/10/creative-gooey-effects/
	var defs = svg.append('defs');
	var filter = defs.append('filter').attr('id','gooey');
	filter.append('feGaussianBlur')
		.attr('in','SourceGraphic')
		.attr('stdDeviation','10')
		.attr('result','blur');
	filter.append('feColorMatrix')
		.attr('in','blur')
		.attr('mode','matrix')
		.attr('values','1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7')
		.attr('result','gooey');
	filter.append('feComposite')
		.attr('in','SourceGraphic')
		.attr('in2','gooey')
		.attr('operator','atop');	
	
	//Append circle at center
	svg.append("circle")
			.attr("class", "centerCircle")
			.attr("cx", 0)
			.attr("cy", 0)
			.attr("r", 20)
			.style("fill", "#81BC00");
	
	//Create the circles that will move out and in the center circle
	var steps = 15;	
	svg.selectAll(".flyCircle")
		.data(d3.range(steps).map(function(num) {return (num/steps)*(2*Math.PI); }))
		.enter().append("circle")
			.attr("class", "flyCircle")
			.attr("cx", 0)
			.attr("cy", 0)
			.attr("r", 15)
			.style("fill", "#81BC00")
			.call(update);

//Continuously moves the circles outward and inward
	function update() {
			var circle = d3.selectAll(".flyCircle");
			var dur = 1500,
				del = 500;
				
			(function repeat() {
				circle
					.transition("outward").duration(dur).delay(function(d,i) { return i*del; })
						.attr("cy", function(d) { return xScale(Math.sin(d)); })
						.attr("cx", function(d) { return xScale(Math.cos(d)); })
					.transition("inward").duration(dur).delay(function(d,i) { return steps*del + i*del; })
						.attr("cx", 0)
						.attr("cy", 0)
					.call(endall, repeat);			
			})();
	}//update

//Taken from https://groups.google.com/forum/#!msg/d3-js/WC_7Xi6VV50/j1HK0vIWI-EJ
	//Calls a function only after the total transition ends
	function endall(transition, callback) { 
		var n = 0; 
		transition 
			.each(function() { ++n; }) 
			.each("end", function() { if (!--n) callback.apply(this, arguments); }); 
	}//endall
	
	</script>
  </body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

Modified http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js to a secure url

https://d3js.org/d3.v3.min.js

https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js

https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js