Adding a glow filter - simple examples

This example is being used in my blog on Adding a subtle touch of glow to your d3.js visualizations

Simple examples of adding an SVG filter to create a glow around shapes. Click anywhere around the shapes to turn the filter on and off. Note that the filter doesn't work on line elements

Another data visualization where I use the glow filter is my redesigned radar chart

<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		
		
		<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
		
		<link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400' rel='stylesheet' type='text/css'>

#glowrange {
				margin: 0 !important;
				padding: 0 !important;
				border: none !important;
				width: auto !important;
				-webkit-appearance: slider-horizontal !important;
			}
		</style>

</head>	
	<body>

<div id="expl" style="margin-top: 20px; margin-left: 20px;">stdDeviation (spread of glow): <input id="glowrange" style="position:relative;top:3px;" type="range" min="1" max="10" value="3"><span style="margin-left: 20px;">Click anywhere to turn the glow on/off</span></div>
		<div id="chart"></div>

///////////////////////////////////////////////////////////////////////////
	//////////////////// Set up and initiate svg containers ///////////////////
	///////////////////////////////////////////////////////////////////////////	
			
	//Adjust the spread of the glow with the simple range slider
	d3.select("input[type=range]").on("change", function() {
	    d3.select(".blur").attr("stdDeviation",this.value);
	});

var margin = {
		top: 0,
		right: 0,
		bottom: 0,
		left: 0
	};
	var width = window.innerWidth - margin.left - margin.right - 20;
	var height = window.innerHeight - margin.top - margin.bottom - 100;
				
	//SVG container
	var svg = d3.select('#chart')
		.append("svg")
		.attr("width", width + margin.left + margin.right)
		.attr("height", height + margin.top + margin.bottom)
		.on("click", switchGlow)
		.append("g")
		.attr("class", "svgWrapper")
		.attr("transform", "translate(" + (width/2 + margin.left) + "," + (height/2 + margin.top) + ")");

var glowOn = true;
	//Switch between glow filter and no filter on click
	function switchGlow() {
		d3.selectAll(".exampleGlow")
			.style("filter", glowOn ? "none" : "url(#glow)");
		glowOn = glowOn ? false : true;
	}

///////////////////////////////////////////////////////////////////////////
	//////////////////////////// Create the filter ////////////////////////////
	///////////////////////////////////////////////////////////////////////////

//Container for the gradients
	var defs = svg.append("defs");

//Code taken from https://stackoverflow.com/questions/9630008/how-can-i-create-a-glow-around-a-rectangle-with-svg
	//Filter for the outside glow
	var filter = defs.append("filter")
		.attr("id","glow");

filter.append("feGaussianBlur")
		.attr("class", "blur")
		.attr("stdDeviation","4.5")
		.attr("result","coloredBlur");

var feMerge = filter.append("feMerge");
	feMerge.append("feMergeNode")
		.attr("in","coloredBlur");
	feMerge.append("feMergeNode")
		.attr("in","SourceGraphic");

///////////////////////////////////////////////////////////////////////////
	//////////////////// Create the circle, path and rect /////////////////////
	///////////////////////////////////////////////////////////////////////////

// //Doesn't appear when the filter is applied to it
	// svg.append("line")
	// 	.attr("class", "exampleGlow")
	// 	.attr("transform", "translate(" + -3*width/8 + "," + 0 + ")")
	// 	.attr("x1", 0)
	// 	.attr("y1", -90)
	// 	.attr("x2", 0)
	// 	.attr("y2", 90)
	// 	.style("stroke", "#EDC951")
	// 	.style("stroke-width", 10);

var rectSize = Math.min(90, 89*width / 1280);
	svg.append("rect")
		.attr("class", "exampleGlow")
		.attr("transform", "translate(" + -width/4 + "," + 0 + ")")
		.attr("x", -rectSize/2)
		.attr("y", -rectSize)
		.attr("width", rectSize)
		.attr("height", rectSize*2)
		.style("fill", "#EDC951");

var circSize = Math.min(75, 75*width / 1280);
	svg.append("circle")
		.attr("class", "exampleGlow")
		.attr("cx", width/4)
		.attr("cy", 0)
		.attr("r", circSize)
		.style("fill", "#CC333F");

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