D3 Examples - Non-contiguous cartogram and choropleth

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
    svg {
        font: 15px sans-serif;
    }
    .caption {
        font-weight: bold;
    }
    .key path {
        display: none;
    }
    .key line {
        stroke: #000;
        shape-rendering: crispEdges;
    }
    .county-border {
        fill: none;
        stroke: black;
    }
    .state-border {
        fill: none;
        stroke: black;
    }
​
</style>
<title>Oklahoma Food Map</title>
<body>
    <script src="https://d3js.org/d3.v3.min.js"></script>
    <script src="https://d3js.org/topojson.v1.min.js"></script>
    <script>
        var width = 1200, height = 700;
​
        var format = d3.format(",")
​
        var formatpercent = d3.format("%")
​
        var color = d3.scale.threshold().domain([.1, .13, .16, .19, .22]).range(["#BFD3E6", '#9EBCDA', '#8C96C6', "#8C6BB1", "#88419D", "#6E016B"]);
​
        // A position encoding for the key only.
        var x = d3.scale.linear().domain([.1, .22]).range([0, 300]);
​
        var xAxis = d3.svg.axis().scale(x).orient("bottom").tickSize(17).tickValues(color.domain()).tickFormat(formatpercent);
​
        var projection = d3.geo.conicConformal().parallels([35 + 34 / 60, 36 + 46 / 60]).rotate([98 + 00 / 60, -35 - 00 / 60]).scale(7220).translate([width / 2, height / 2]);
​
        var path = d3.geo.path().projection(projection);
​
        var div = d3.select("body").append("div").attr("class", "tooltip").style("opacity", 0);
​
        var svg = d3.select("body").append("svg").attr("width", width).attr("height", height);
​
        var g = svg.append("g").attr("class", "key").attr("transform", "translate(20,350)");
​
        g.selectAll("rect").data(color.range().map(function(d, i) {
            return {
                x0 : i ? x(color.domain()[i - 1]) : x.range()[0],
                x1 : i < color.domain().length ? x(color.domain()[i]) : x.range()[1],
                z : d
            };
        })).enter().append("rect").attr("height", 12).attr("x", function(d) {
            return d.x0;
        }).attr("width", function(d) {
            return d.x1 - d.x0;
        }).style("fill", function(d) {
            return d.z;
        });
​
        g.call(xAxis).append("text").attr("class", "caption").attr("y", -6).text("Food insecurity rate");
​
        d3.json("ok-countiesfood.json", function(error, ok) {
            var counties = topojson.feature(ok, ok.objects.counties);
​
            //counties
            svg.append("g").attr("class", "county").selectAll("path").data(counties.features).enter().append("path").attr("d", path).style("fill", function(d) {
                return color(d.properties.firate);
            }).attr("transform", function(d) {
                var centroid = path.centroid(d), x = centroid[0], y = centroid[1];
                return "translate(" + x + "," + y + ")" + "scale(" + Math.sqrt((d.properties.percentobese) * 0.025 || 0) + ")" + "translate(" + -x + "," + -y + ")";
            }).style("stroke-width", function(d) {
                return 1 / Math.sqrt((d.properties.percentobese) * 0.025 || 1);
            });
            //county borders
            svg.append("path").datum(topojson.mesh(ok, ok.objects.counties, function(a, b) {
                return a !== b;
            })).attr("class", "county-border").attr("d", path);
​
            //state borders
            svg.append("path").datum(topojson.mesh(ok, ok.objects.counties, function(a, b) {
                return a === b;
            })).attr("class", "state-border").attr("d", path);
​
        });
​
        d3.select(self.frameElement).style("height", height + "px");
​
    </script>
    