D3 Examples - Assignment 4

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Greenhouse gas emissions</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
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            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
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            h1 {
                font-size: 24px;
                margin: 0;
            }
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            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
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            svg {
                background-color: white;
            }
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            circle:hover {
                fill: red;
            }
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            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
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            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
        </style>
    </head>
    <body>
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        <h1>Greenhouse gas emissions (1990 - 2012)</h1>
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        <p>Greenhouse gas emissions from 1990 - 2012 by OECD country. The unit is in houndred thousands tonnes of CO2 equivalent. Source: <a href="https://www.oecd-ilibrary.org/environment/data/oecd-environment-statistics/greenhouse-gas-emissions_data-00594-en">OECD</a>, 2015</p>
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        <script type="text/javascript">
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​
            var w = 700;
            var h = 600;
            var padding = [ 50, 10, 50, 100 ];  //Top, right, bottom, left
            var year = "1990";
            var year2 = "2012";
​
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            var xScale = d3.scale.linear()
                                .range([ padding[3], w - padding[1] - padding[3] ]);
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            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2] ]);
​
​
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            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            .ticks(15);
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            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left")
                            .ticks(15);
​
​
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
​
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            d3.csv("GreenhouseEmissions.csv", function(data) {
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                xScale.domain([
                    d3.min(data, function(d) {
                        return +d[year]/1000;
                    }),
                    d3.max(data, function(d) {
                        return +d[year]/1000;
                    })
                ]);
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                yScale.domain([
                    d3.max(data, function(d) {
                        return +d[year2]/1000;
                    }),
                    d3.min(data, function(d) {
                        return +d[year2]/1000;
                    })
                ]);
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                var circles = svg.selectAll("circle")
                                .data(data)
                                .enter()
                                .append("circle");
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                circles.attr("cx", function(d) {
                        return xScale(+d[year]/1000);
                    })
                    .attr("cy", function(d) {
                        return yScale(+d[year2]/1000);
                    })
                    .attr("r", 0.1)
                    .attr("fill", "green")
                    .append("title")
                    .text(function(d) {
                        return d.Country + "'s greenhouse gas emissions 1990 is " + d[year] + ", and 2012 " + d[year2] + "";
                    });
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                circles.sort(function(a, b) {
                        return d3.ascending(+a[year], +b[year]);
                    })
                    .transition()
                    .delay(function(d, i) {
                        return i * 50;
                    })
                    .duration(2000)
                    .attr("r", 4);
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                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2] + 10) + ")")
                    .call(xAxis);
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                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + (padding[3] - 10) + ",0)")
                    .call(yAxis);
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                svg.append("text")
                .attr("class", "x label")
                .attr("text-anchor", "end")
                .attr("x", w/2+100)
                .attr("y", h)
                .text("emissions (1990)");
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                svg.append("text")
                  .attr("class", "y label")
                  .attr("text-anchor", "end")
                  .attr("y", 6)
                    .attr("x", -(h/2-100))
                  .attr("dy", ".75em")
                  .attr("transform", "rotate(-90)")
                  .text("emissions (2012)");
​
            });
​
​
        </script>
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    </body>
</html>
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