D3 Examples - Homeless By State, 2014 vs Estimated Population (m5)

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Transition Delays</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
​
            h1 {
                font-size: 24px;
                margin: 0;
            }
​
            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
​
            svg {
                background-color: white;
            }
​
            circle:hover {
                fill: orange;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
        </style>
    </head>
    <body>
​
        <h1>Homeless population in the USA, 2014</h1>
​
        <script type="text/javascript">     
​
​
            var w = 700;
            var h = 600;
            var padding = [ 20, 10, 50, 80 ];  //Top, right, bottom, left
​
​
​
            var xScale = d3.scale.linear()
                                .range([ padding[3], w - padding[1] - padding[3] ]);
            
            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2] ]);
​
​
​
            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            .tickFormat(function(d) {
                                return (+d/1000)+"K";
                            });
​
            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left")
                            .tickFormat(function(d) {
                                return (+d/1000)+"K";
                            });
​
​
​
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
​
​
            d3.csv("combined.csv", function(data) {
​
                xScale.domain([ 
                    d3.min(data, function(d) {
                        return +d.census;
                    }), 
                    d3.max(data, function(d) {
                        return +d.census;
                    })
                ]);
​
                yScale.domain([
                    d3.max(data, function(d) {
                        return +d.homeless;
                    }),
                    d3.min(data, function(d) {
                        return +d.homeless;
                    })
                ]);
​
                var circles = svg.selectAll("circle")
                                .data(data)
                                .enter()
                                .append("circle");
​
                circles.attr("cx", function(d) {
                        return xScale(d.census);
                    })
                    .attr("cy", function(d) {
                        return yScale(d.homeless);
                    })
                    .attr("r", 0.1)
                    .attr("fill", "steelblue")
                    .append("title")
                    .text(function(d) {
                        return d.state + ": " + (parseFloat(d.percent_homeless)*100).toFixed(2) + "% homeless";
                    });
​
                circles.sort(function(a, b) {
                        return d3.ascending(+a.census, +b.census);
                    })
                    .transition()
                    .delay(function(d, i) {
                        return i * 4;
                    })
                    .duration(500)
                    .attr("r", 4);
​
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2] + 10) + ")")
                    .call(xAxis);
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + (padding[3] - 10) + ",0)")
                    .call(yAxis);
​
                svg.append("text")
                    .attr("class", "x label")
                    .attr("text-anchor", "end")
                    .attr("x", w)
                    .attr("y", h - 6)
                    .text("Estimated Population");
                svg.append("text")
                    .attr("class", "y label")
                    .attr("text-anchor", "end")
                    .attr("y", 6)
                    .attr("dy", ".75em")
                    .attr("transform", "rotate(-90)")
                    .text("Homeless population");
​
            });
​
​
        </script>
​
    </body>
</html>
    