d3
Version:
A small, free JavaScript library for manipulating documents based on data.
118 lines (97 loc) • 3.15 kB
HTML
<html>
<head>
<script type="text/javascript" src="../../d3.js"></script>
<script type="text/javascript" src="../../d3.csv.js"></script>
<script type="text/javascript" src="../../d3.time.js"></script>
<style type="text/css">
body {
font: 10px sans-serif;
margin: 0;
}
path.line {
fill: none;
stroke: #666;
stroke-width: 1.5px;
}
path.area {
fill: #e7e7e7;
}
.axis path, .axis line {
fill: none;
stroke: #fff;
shape-rendering: crispEdges;
}
</style>
</head>
<body>
<script type="text/javascript">
var m = [20, 20, 20, 20],
w = 960 - m[1] - m[3],
h = 140 - m[0] - m[2],
parse = d3.time.format("%b %Y").parse;
// Scales. Note the inverted domain for the y-scale: bigger is up!
var x = d3.time.scale().range([0, w]),
y = d3.scale.linear().range([h, 0]);
// X-axis.
var xAxis = d3.svg.axis()
.scale(x)
.tickSize(-h);
// An area generator, for the light fill.
var area = d3.svg.area()
.interpolate("monotone")
.x(function(d) { return x(d.date); })
.y0(h)
.y1(function(d) { return y(d.price); });
// A line generator, for the dark stroke.
var line = d3.svg.line()
.interpolate("monotone")
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.price); });
d3.csv("../data/stocks.csv", function(data) {
// Nest values by symbol.
var symbols = d3.nest()
.key(function(d) { return d.symbol; })
.entries(data);
// Parse dates and numbers. We assume values are sorted by date.
// Also compute the maximum price per symbol, needed for the y-domain.
symbols.forEach(function(s) {
s.values.forEach(function(d) { d.date = parse(d.date); d.price = +d.price; });
s.maxPrice = d3.max(s.values, function(d) { return d.price; });
});
// Compute the minimum and maximum date across symbols.
x.domain([
d3.min(symbols, function(d) { return d.values[0].date; }),
d3.max(symbols, function(d) { return d.values[d.values.length - 1].date; })
]);
// Add an SVG element for each symbol, with the desired dimensions and margin.
var svg = d3.select("body").selectAll("svg")
.data(symbols)
.enter().append("svg:svg")
.attr("width", w + m[1] + m[3])
.attr("height", h + m[0] + m[2])
.append("svg:g")
.attr("transform", "translate(" + m[3] + "," + m[0] + ")");
// Add the area path elements. Note: the y-domain is set per element.
svg.append("svg:path")
.attr("class", "area")
.attr("d", function(d) { y.domain([0, d.maxPrice]); return area(d.values); });
// Add the x-axis.
svg.append("svg:g")
.attr("class", "x axis")
.attr("transform", "translate(0," + h + ")")
.call(xAxis);
// Add the line path elements. Note: the y-domain is set per element.
svg.append("svg:path")
.attr("class", "line")
.attr("d", function(d) { y.domain([0, d.maxPrice]); return line(d.values); });
// Add a small label for the symbol name.
svg.append("svg:text")
.attr("x", w - 6)
.attr("y", h - 6)
.attr("text-anchor", "end")
.text(function(d) { return d.key; });
});
</script>
</body>
</html>