4.10 scatter plot | glowed

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<style>

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#h1 {
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</style>
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<body>
  

<p id="h1">SCATTER | GLOWED</p>
<div id="link">by
<a href="https://slides.com/sandravizmad">SANDRA</a></div>  
  
<script>

//Margin conventions
var m = {top:100, right:50, bottom:50, left:40}
    w = 700 - m.left - m.right,
    h = 700 - m.top - m.bottom;

//Container
var svg = d3.select("body")
    .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
		.attr("transform", `translate(${m.left}, ${m.top})`);

//Global variables
const user15 = "users_2015";
const change = "change";
const pop = "population";

//Define the format
var formatNumber = d3.format(".1s");

//Data loading
d3.csv( "https://gist.githubusercontent.com/sandravizz/30c3df855966b2e419f1509604f9210e/raw/8e63e4049e7e503e51dd5b574b6a24825f946fff/country_change",
  prepare,
  function(data) {

//Radius scale
    var r = d3.scaleSqrt()
        .domain(d3.extent(data, d => d[pop]))
        .range([3, 25])

//X scale
    var x = d3.scaleLinear()
        .domain([0, 100])
        .range([0, w]);

//Y scale
    var y = d3.scaleLog()
        .domain(d3.extent(data, d => d[change]))
        .range([h, 0]);

//Color scale
    var c = d3.scaleLog()
        .domain(d3.extent(data, d => d[pop]))
        .range(["#85f6fa", "#8ff798"]);

//X axis
    svg.append("g")
        .attr("class", "x-axis")
	      .attr("transform", `translate(0, ${h})`)
        .call(d3.axisBottom()
                 .scale(x)
    		         .ticks(4)
 					       .tickSize(-h)
                 .tickPadding(5))
        .append("text")
        .text("% USAGE 2015")
        .attr("x", w)
        .attr("y", 30);

//Y axis
    svg.append("g")
        .attr("class", "y-axis")
        .attr("transform",`translate(0, ${0})`)
        .call(d3.axisLeft()
                 .scale(y)
    		         .ticks(4)
                 .tickSize(-w)
					       .tickPadding(5)
                 .tickFormat(formatNumber))
        .append("text")
        .text("% GROWTH 2010-15")
        .attr("x", 100)
        .attr("y", -20);

//Creating a filter for the glowing
    svg.selectAll("filter")
        .data(d3.nest()
    	    .key(d => d.region)
    	    .entries(data))
        .enter()
        .append("filter")
        .attr("width", "300%")
        .attr("x", "-100%")
        .attr("height", "300%")
        .attr("y", "-100%")
        .attr("id",d => d.key + "glow")
        .append("feGaussianBlur")
        .attr("stdDeviation", 4.5);

//Drawing the circles
    svg.selectAll("g")
        .data(data)
        .enter()
        .append("g")
        .attr("transform", d => `translate(${x(d[user15])}, ${y(d[change])})`)
        .append("circle")
        .attr("r", d => r(d[pop]))
        .attr("fill", d => c(d[pop]))
        .style("filter", d => {return"url(#" + d.region + "glow)"});

});

//Check the data
function prepare(d) {
  d.regin = d.region;
  d.change = +d.change;
  d.population = +d.population;
  d.users_2015 = +d.users_2015;
  d.users_2010 = +d.users_2010;
  return d;
};

</script>
</body>
</html>

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