Module 6 Exercise: Time-Series on SF Transportation Funding

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Federal Support for Bay Area Transit Systems</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: 12px;
				margin: 10px 0 0 0;
			}

svg {
				background-color: white;
			}

circle:hover {
				fill: blue;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}

</style>
	</head>
	<body>

<h1>Comparing Federal Outlays for the BART and Muni Systems</h1>

<p>This line chart compares federal funding for the <strong style="color: red;">SF Muni</strong> and <strong style="color: blue;">BART</strong> systems for the years 1991 to 2013. Source: <a href="https://www.ntdprogram.gov/ntdprogram/data.htm">National Transit Data Base</a>.</p>

var w = 900;
			var h = 700;
			var padding = [ 20, 10, 50, 75 ];

var dateFormat = d3.time.format("%Y");

var xScale = d3.time.scale()
.range([ padding[3], w - padding[1] - padding[3] ]);
			
var yScale = d3.scale.linear()
.range([ padding[0], h - padding[2] ]);

var xAxis = d3.svg.axis()
.scale(xScale)
.orient("bottom")
.ticks(5)
.tickFormat(function(d) {
return dateFormat(d);
							});

var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");
            
var line = d3.svg.line()
    .x(function(d) {
        return xScale(dateFormat.parse(d.year));
})
.y(function(d) {
    return yScale(d.federalfunding);
				});

var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);

d3.csv("muni_fed.csv", function(muniData) {

d3.csv("bart_fed.csv", function(bartData) {

var mergedData = muniData.concat(bartData);
					console.log(mergedData);
				
xScale.domain([ 
d3.min(mergedData, function(d) {
							return dateFormat.parse(d.year);
						}),
d3.max(mergedData, function(d) {
							return dateFormat.parse(d.year);
						})
					]);

yScale.domain([ 
d3.max(mergedData, function(d) {
							return +d.federalfunding;
						}),
						0
					]);

svg.data([ muniData ]).append("path")
.attr("class", "line muni")
.attr("d", line)
.attr("fill", "none")
.attr("stroke", "red")
.attr("stroke-width", 2);

svg.data([ bartData ]).append("path")
.attr("class", "line bart")
.attr("d", line)
.attr("fill", "none")
.attr("stroke", "blue")
.attr("stroke-width", 2);
                    
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);

});

</script>

</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js