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Created October 4, 2015 17:28
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year winner totVote evFor evAgainst pctVote
2012 Barack Obama 538 332 206 61.71%
2008 Barack Obama 538 365 173 67.84%
2004 George W. Bush 538 286 251 53.16%
2000 George W. Bush 538 271 266 50.37%
1996 Bill Clinton 538 379 159 70.45%
1992 Bill Clinton 538 370 168 68.77%
1988 George H. W. Bush 538 426 111 79.18%
1984 Ronald Reagan 538 525 13 97.58%
1980 Ronald Reagan 538 489 49 90.89%
1976 Jimmy Carter 538 297 240 55.20%
1972 Richard Nixon 538 520 17 96.65%
1968 Richard Nixon 538 301 191 55.95%
1964 Lyndon B. Johnson 538 486 52 90.33%
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Module 6 Line Graphs</title>
<script type="text/javascript" src="http://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;
}
path {
stroke: gray;
stroke-width: 0.5;
}
g.highlight path {
stroke: steelblue;
stroke-width: 2;
}
.axis path,
.axis line {
fill: none;
stroke: black;
stroke-width: 1;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
</style>
</head>
<body>
<h1>Winner's Electoral College Vote Share</h1>
<p>Electoral votes received by winner and loser in US Presidential Elections, 1968 - 2012. Source: <a href="https://en.wikipedia.org/wiki/List_of_United_States_presidential_elections_by_Electoral_College_margin">Wikipedia</a>, 2015</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.amount);
});
//Create the empty SVG image
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
//Load USA data
d3.csv("electoral.csv", function(data) {
//New array with all the years, for referencing later
var years = ["1964", "1968", "1972", "1976", "1980", "1984", "1988", "1992", "1996", "2000", "2004", "2008", "2012"];
//Create a new, empty array to hold our restructured dataset
var dataset = [
{
candidate: "winner",
votes: []
},
{
candidate: "loser",
votes: []
}
];
//Loop through all the years
for (var j = 0; j < data.length; j++) {
dataset[0].votes.push({
year: data[j].year,
amount: data[j].evFor
});
}
for (var j = 0; j < data.length; j++) {
dataset[1].votes.push({
year: data[j].year,
amount: data[j].evAgainst
});
}
//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.votes, function(d) {
return +d.amount;
});
}),
0
]);
//Make a group for each
var groups = svg.selectAll("g")
.data(dataset)
.enter()
.append("g")
.classed("highlight", function(d) {
if (d.candidate == "winner") {
return true;
} else {
return false;
}
});
//Append a title with the name (so we get easy tooltips)
groups.append("title")
.text(function(d) {
return d.candidate;
});
//Within each group, create a new line/path,
//binding just the data to each one
groups.selectAll("path")
.data(function(d) {
return [ d.votes ];
})
.enter()
.append("path")
.attr("class", "line")
.attr("d", line)
.attr("fill", "none")
.attr("stroke-width", 2);
//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 data load function
</script>
</body>
</html>
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