Gooey effect - Rotating circles - Blending colors

This example appears on my blog on More fun data visualizations with the gooey effect

The SVG Gooey effect that is create by applying an SVG filter to a group element in which the circles are created. In this version the colors blend together nicely because I've left out one step in the SVG filter that places the original sharp SVG shape back on top the blurred one.

Although the blending of colors looks nice, smaller shapes might appear even smaller than they really are, due to the blurring and not placing the original shape back on top.

To see the same visual, but with the last step added to the filter so you have your exact shapes back, please check out my other bl.ock: Gooey effect Rotating circles Non-blending colors

You can find the other examples from the blog here

Older examples with the Gooey effect

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		<meta charset="utf-8">
		
		
		<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>

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	<body>

///////////////////////////////////////////////////////////////////////////
			//////////////////// Set up and initiate svg containers ///////////////////
			///////////////////////////////////////////////////////////////////////////

var margin = {
				top: 10,
				right: 10,
				bottom: 10,
				left: 10
			};
			var width = 400,
				height = 400;
						
			//SVG container
			var svg = d3.select('#chart')
				.append("svg")
				.attr("width", width + margin.left + margin.right)
				.attr("height", height + margin.top + margin.bottom)
				.append("g")
				.attr("transform", "translate(" + (margin.left + width/2) + "," + (margin.top + height/2) + ")");

///////////////////////////////////////////////////////////////////////////
			///////////////////////////// Create filter ///////////////////////////////
			///////////////////////////////////////////////////////////////////////////

//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","gooeyCodeFilter");
			filter.append("feGaussianBlur")
				.attr("in","SourceGraphic")
				.attr("stdDeviation","10")
				//to fix safari: https://stackoverflow.com/questions/24295043/svg-gaussian-blur-in-safari-unexpectedly-lightens-image
				.attr("color-interpolation-filters","sRGB") 
				.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 19 -9")
				.attr("result","gooey");

///////////////////////////////////////////////////////////////////////////
		/////////////////////////// Create circles ////////////////////////////////
		///////////////////////////////////////////////////////////////////////////

//Create scale
		var xScale = d3.scale.linear()
			.domain([-1.25, 1.25])
			.range([-width/2, width/2]);
		
		//Create a wrapper for the circles that has the Gooey effect applied to it
		var circleWrapper = svg.append("g")
			.style("filter", "url(#gooeyCodeFilter)");

//Create the circles that will move out and in the center circle
		var steps = 14;
		var colors = ["#F95B34", "#EE3E64", "#F36283", "#FF9C34", "#EBDE52", "#B7D84B", "#44ACCF"];
		var flyCircleData = [];
		for (var i = 0; i < steps; i++) {
			flyCircleData.push({ 
				fixedAngle: (i/steps)*(2*Math.PI),
				randomAngle: (i/steps)*(2*Math.PI),
				speed: Math.random() * 7000 + 3000,
				r: Math.floor(Math.random() * 20 + 15),
				color: colors[i%colors.length]
			})
		}//for i

//Set up the circles
		var flyCircles = circleWrapper.selectAll(".flyCircle")
			.data(flyCircleData)
			.enter().append("circle")
			.attr("class", "flyCircle")
			.style("fill", function(d) { return d.color; })
			.attr("cy", 0)
			.attr("cx", 0)
			.attr("r", 0)
			.transition().duration(500)//.delay(function(d,i) { return i*50; })
			.attr("cy", function(d) { return xScale(Math.sin(d.fixedAngle)); })
			.attr("cx", function(d) { return xScale(Math.cos(d.fixedAngle)); })
			.attr("r", function(d) { return d.r; })
			.each("end", goRound);
			
		//Continuously moves the circles with different speeds
		function goRound(d) {
			d3.select(this)
				.transition().duration(function(d) { return d.speed; })
				.ease("linear")
				.attrTween("transform", function() { return d3.interpolateString("rotate(0)", "rotate(360)"); })
				.each("end", goRound);
		}//function goRound
									
		</script>

</body>
</html>

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