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Created April 27, 2015 02:52
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Exercise 6 for Data Visualizations and Infographics with D3
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Global Obesity Trends</title>
<script type="text/javascript" src="http://d3js.org/d3.v3.js"></script>
<style type="text/css">
body {
background-color: whitesmoke;
font-family: 'Raleway', Helvetica, sans-serif;
font-weight: 300;
}
h1 {
font-weight: 400;
line-height: 1.5em;
border-bottom: 1px solid gray;
}
svg {
background-color: mistyrose;
width: 100%;
}
@media screen and (min-width: 768px) {
svg {
width: 75%;
}
}
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
.y.axis path,
.y.axis line {
opacity: 1;
}
p {
font-size: 14px;
margin: 10px 0;
}
</style>
</head>
<body>
<h1>Trends in Obesity by Country</h1>
<p>Obesity rates for selected OECD countries between 1973 and 2014. (Hover over each line to reveal country name. Data is not available for the entire period for all countries.) Some data were self-reported (dotted lines), whereas others were actually measured (solid lines). Source: <a href="http://www.oecd.org/health/health-systems/Fig2-Obesity-rates.xls">OECD.org</a></p>
<svg id="line-chart" viewBox="0 0 1000 1000" preserveAspectRatio="xMidYMid">
<!-- -->
</svg>
<script type="text/javascript">
var svg1 = d3.select("svg"),
h = document.getElementById('line-chart').scrollHeight,
w = document.getElementById('line-chart').scrollWidth,
padding = [50, 20, 20, 120],
yScale = d3.scale.linear().range([ padding[0], h - padding[2] ]),
xScale = d3.time.scale().range([padding[3], w - padding[1] ]),
xAxis = d3.svg.axis().scale(xScale).orient("bottom").tickFormat(function(d) {return dateFormat(d);}),
yAxis = d3.svg.axis().scale(yScale).orient("left").tickFormat(d3.format("%")),
xOffset = 10,
yOffset = xOffset;
//Set up date formatting and years
var dateFormat = d3.time.format("%Y");
// //BETTER XSCALE & AXES?
// var xScale = d3.time.scale()
// .range([ padding[3], w - padding[1] - padding[3] ]);
//Configure axis generators
// var xAxis = d3.svg.axis()
// .scale(xScale)
// .orient("bottom")
// .ticks(15)
// .tickFormat(function(d) {
// return dateFormat(d);
// });
// var yAxis = d3.svg.axis()
// .scale(yScale)
// .orient("left");
//Configure line generator
var line = d3.svg.line()
.x(function(d) {
return xScale(dateFormat.parse(d.year));
})
.y(function(d) {
return yScale(+d.rate);
});
//Load data
d3.csv("obesity-rates-by-year.csv", function(data) {
//Data is loaded in, but we need to restructure it.
//Remember, each line requires an array of x/y pairs;
//that is, an array of arrays, like so:
//
// [ [x: 1, y: 1], [x: 2, y: 2], [x: 3, y: 3] ]
//
//We, however, are using 'year' as x and 'amount' as y.
//We also need to know which country belongs to each
//line, so we will build an array of objects that is
//structured like this:
/*
[
{
country: "Australia",
emissions: [
{ year: 1961, amount: 90589.568 },
{ year: 1962, amount: 94912.961 },
{ year: 1963, amount: 101029.517 },
]
},
{
country: "Bermuda",
emissions: [
{ year: 1961, amount: 176.016 },
{ year: 1962, amount: 157.681 },
{ year: 1963, amount: 150.347 },
]
},
]
*/
//Note that this is an array of objects. Each object
//contains two values, 'country' and 'emissions'.
//The 'emissions' value is itself an array, containing
//more objects, each one holding 'year' and 'amount' values.
//New array with all the years, for referencing later
var years = ["1973", "1978", "1987", "1990", "1991", "1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010", "2011", "2012", "2013", "2014"];
console.log(data);
//Create a new, empty array to hold our restructured dataset
var dataset = [];
//Loop once for each row in data
for (var i = 0; i < data.length; i++) {
//Create new object with this country's name and empty array
dataset[i] = {
country: data[i]["Country"],
dataType: data[i]["Data"],
obesityRates: []
};
//Loop through all the years
for (var j = 0; j < years.length; j++) {
// If value is not empty
if (data[i][years[j]]) {
//Add a new object to the emissions data array
//for this country if one exists for this year
dataset[i]["obesityRates"].push({
year: years[j],
rate: data[i][years[j]]
});
}
}
}
console.log(dataset);
//Set scale domains
xScale.domain([
d3.min(years, function(d) {
return dateFormat.parse(d);
}),
d3.max(years, function(d) {
return dateFormat.parse(d);
})
]);
yScale.domain([
d3.max(dataset, function(d) {
return d3.max(d["obesityRates"], function(e) {
return +e["rate"];
});
}),
0
]);
//Make a group for each country
var groups = svg1.selectAll("g")
.data(dataset)
.enter()
.append("g")
.classed("self-reported", function(d) {
if (d.dataType === "self-reported") {
return true;
} else {
return false;
}
});
//Append a title with the country name (so we get easy tooltips)
groups.append("title")
.text(function(d) {
return d.country;
});
//Within each group, create a new line/path,
//binding the obesity rate data to each one
groups.selectAll("path")
.data(function(d) {
return [ d.obesityRates ];
})
.enter()
.append("path")
.attr("class", "line")
.attr("d", line)
.attr("fill", "none")
.attr("stroke", "gray")
.attr("stroke-width", 2);
// Make lines from self-reported data dashed
d3.selectAll(".self-reported path")
.attr("stroke-dasharray", "5,5");
//Axes
svg1.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (h - padding[2]) + ")")
.call(xAxis);
svg1.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + (padding[3]) + ",0)")
.call(yAxis);
});
</script>
</body>
</html>
Country Data 1973 1978 1987 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
United States measured 0.1372920797 0.1536677972 0.2181977146 0.2937643484 0.2940559119 0.3125682329 0.3314561096 0.3240610504 0.3457215378 0.3443611119
Canada self-reported 0.1365326861 0.1595444607 0.1679761279 0.17924919 0.1888175504 0.1923309785
Mexico measured 0.2819796396 0.3051071691 0.3289594364
Spain self-reported 0.097575 0.090487 0.110525 0.119818 0.12003 0.12143 0.138948 0.140604 0.1522178198
France self-reported 0.061681 0.060188 0.066347 0.066248 0.071629 0.070605 0.087637 0.077696 0.084232 0.090114 0.090777 0.098537 0.10743 0.111651 0.122403
Italy self-reported 0.068203 0.083112 0.086724 0.0875604861 0.0848055899 0.0828324437 0.0861655199 0.0860337329 0.0833290314 0.0862485294
England measured 0.142716 0.144369 0.14516 0.151147 0.15887 0.167192 0.176034 0.183015 0.190308 0.200086 0.212824 0.2146687562 0.2158770704 0.2210202756 0.2234572976 0.2285242412 0.2271382578 0.2338699502 0.2175313457 0.2487609527 0.2327842658
Switzerland self-reported 0.050836 0.062105 0.07183 0.075202 0.090458
Korea measured 0.02367 0.03165 0.033893 0.037455 0.0437718291
Australia measured 0.1820782099 0.2374963855 0.2632963039
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