d3
Version:
A small, free JavaScript library for manipulating documents based on data.
154 lines (126 loc) • 3.67 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 {
shape-rendering: crispEdges;
}
.x.axis line {
stroke: #fff;
}
.x.axis .minor {
stroke-opacity: .5;
}
.x.axis path {
display: none;
}
.y.axis line, .y.axis path {
fill: none;
stroke: #000;
}
</style>
</head>
<body>
<script type="text/javascript">
var m = [20, 40, 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]);
// Axes.
var xAxis = d3.svg.axis().scale(x).tickSize(-h).tickSubdivide(true),
yAxis = d3.svg.axis().scale(y).ticks(4).orient("right");
// 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) {
// Filter to one symbol; the S&P 500.
var values = data.filter(function(d) {
return d.symbol == "S&P 500";
});
// Parse dates and numbers. We assume values are sorted by date.
values.forEach(function(d) {
d.date = parse(d.date);
d.price = +d.price;
});
// Compute the minimum and maximum date, and the maximum price.
x.domain([values[0].date, values[values.length - 1].date]);
y.domain([0, d3.max(values, function(d) { return d.price; })]);
// Add an SVG element with the desired dimensions and margin.
var svg = d3.select("body").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 clip path.
svg.append("svg:clipPath")
.attr("id", "clip")
.append("svg:rect")
.attr("width", w)
.attr("height", h);
// Add the area path.
svg.append("svg:path")
.attr("class", "area")
.attr("clip-path", "url(#clip)")
.attr("d", area(values));
// Add the x-axis.
svg.append("svg:g")
.attr("class", "x axis")
.attr("transform", "translate(0," + h + ")")
.call(xAxis);
// Add the y-axis.
svg.append("svg:g")
.attr("class", "y axis")
.attr("transform", "translate(" + w + ",0)")
.call(yAxis);
// Add the line path.
svg.append("svg:path")
.attr("class", "line")
.attr("clip-path", "url(#clip)")
.attr("d", line(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(values[0].symbol);
// On click, update the x-axis.
svg.on("click", function() {
var n = values.length - 1,
i = Math.floor(Math.random() * n / 2),
j = i + Math.floor(Math.random() * n / 2) + 1;
x.domain([values[i].date, values[j].date]);
var t = svg.transition().duration(750);
t.select(".x.axis").call(xAxis);
t.select(".area").attr("d", area(values));
t.select(".line").attr("d", line(values));
});
});
</script>
</body>
</html>