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<html lang="en">
<head>
<meta charset="utf-8">
<title>Cleaning Up</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;
}
g.highlight path {
stroke: green;
stroke-width: 5;
}
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
</style>
</head>
<body>
<h1>Forest area by country</h1>
<p>Variations of forest area in the top 20 countries by woodland, 1990 - 2010</p>
<script type="text/javascript">
//Dimensions and padding
var w = 700;
var h = 600;
var padding = [ 20, 10, 50, 100 ]; //Top, right, bottom, left
//Set up date formatting and years
var dateFormat = d3.time.format("%Y");
//Set up scales
var xScale = d3.time.scale()
.range([ padding[3], w - padding[1] - padding[3] ]);
var yScale = d3.scale.linear()
.range([ padding[0], h - padding[2] ]);
//Configure axis generators
var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(12)
.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.area);
});
//Create the empty SVG image
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Load data
d3.csv("forestdata.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 'area' 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",
forestarea: [
{ year: 1961, area: 90589.568 },
{ year: 1962, area: 94912.961 },
{ year: 1963, area: 101029.517 },
…
]
},
{
country: "Bermuda",
forestarea: [
{ year: 1961, area: 176.016 },
{ year: 1962, area: 157.681 },
{ year: 1963, area: 150.347 },
…
]
},
…
]
*/
//Note that this is an array of objects. Each object
//contains two values, 'country' and 'forestarea'.
//The 'forestarea' value is itself an array, containing
//more objects, each one holding 'year' and 'area' values.
//New array with all the years, for referencing later
var years = ["1990", "1991", "1992", "1993", "1994", "1995", "1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004", "2005", "2006", "2007", "2008", "2009", "2010", "2011", "2012"];
//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,
forestarea: []
};
//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 forestarea data array
//for this country
dataset[i].forestarea.push({
year: years[j],
area: data[i][years[j]]
});
}
}
}
//Uncomment to log the original data to the console
console.log(data);
//Uncomment to log the newly restructured dataset to the console
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.forestarea, function(d) {
return +d.area;
});
}),
0
]);
var groups = svg.selectAll("g")
.data(dataset)
.enter()
.append("g")
.classed("highlight", function(d) {
if (d.country == "Brazil" ||
d.country == "China") {
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 just the forestarea data to each one
groups.selectAll("path")
.data(function(d) {
return [ d.forestarea ];
})
.enter()
.append("path")
.attr("class", "line")
.attr("d", line)
.attr("fill", "none")
.attr("stroke", "grey")
.attr("stroke-width", 1)
.append("title")
.text(function(d) {
return d.country ;
});
//Axes
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + (h - padding[2]) + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.attr("transform", "translate(" + (padding[3]) + ",0)")
.call(yAxis);
});
//End USA data load function
</script>
</body>
</html>
Modified http://d3js.org/d3.v3.js to a secure url
https://d3js.org/d3.v3.js