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splom.html
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splom.html
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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<link type="text/css" rel="stylesheet" href="style.css"/>
<script type="text/javascript" src="d3/d3.js"></script>
<style type="text/css">
.chart {
display: block;
margin: auto;
margin-top: 40px;
font-size: 10px;
}
.axis {
shape-rendering: crispEdges;
}
.axis line {
stroke: #ddd;
stroke-width: .5px;
}
.axis path {
display: none;
}
circle {
fill-opacity: .5;
pointer-events: none;
}
circle.hidden {
fill: #ccc !important;
}
.cell text {
font-size: 12px;
}
rect {
cursor: crosshair;
fill: #fff;
fill-opacity: .5;
stroke: #aaa;
stroke-width: 1.5px;
pointer-events: all;
}
rect.brush {
fill: #999;
}
</style>
</head>
<body>
<div id="body">
<div id="footer">
Iris Flowers
<div class="hint">drag to highlight samples</div>
</div>
</div>
<script type="text/javascript">
d3.json("flowers.json", function(flower) {
// Size parameters.
var size = 150,
padding = 19.5,
n = flower.traits.length;
// Color scale.
var color = d3.scale.ordinal().range([
"rgb(50%, 0%, 0%)",
"rgb(0%, 50%, 0%)",
"rgb(0%, 0%, 50%)"
]);
// Position scales.
var x = {}, y = {};
flower.traits.forEach(function(trait) {
var domain = [d3.min(flower.values, value), d3.max(flower.values, value)],
range = [padding / 2, size - padding / 2];
x[trait] = d3.scale.linear().domain(domain).range(range);
y[trait] = d3.scale.linear().domain(domain).range(range.reverse());
function value(d) { return d[trait]; }
});
// Axes.
var axis = d3.svg.axis()
.ticks(5)
.tickSize(size * n);
// Root panel.
var svg = d3.select("#body").append("div")
.attr("class", "chart")
.style("width", size * n + padding + "px")
.style("height", size * n + padding + "px")
.append("svg:svg")
.attr("width", size * n + padding)
.attr("height", size * n + padding);
// X-axis.
svg.selectAll("g.x.axis")
.data(flower.traits)
.enter().append("svg:g")
.attr("class", "x axis")
.attr("transform", function(d, i) { return "translate(" + i * size + ",0)"; })
.each(function(d) { d3.select(this).call(axis.scale(x[d]).orient("bottom")); });
// Y-axis.
svg.selectAll("g.y.axis")
.data(flower.traits)
.enter().append("svg:g")
.attr("class", "y axis")
.attr("transform", function(d, i) { return "translate(0," + i * size + ")"; })
.each(function(d) { d3.select(this).call(axis.scale(y[d]).orient("right")); });
// Cell and plot.
var cell = svg.selectAll("g.cell")
.data(cross(flower.traits, flower.traits))
.enter().append("svg:g")
.attr("class", "cell")
.attr("transform", function(d) { return "translate(" + d.i * size + "," + d.j * size + ")"; })
.each(plot);
// Plot frame.
cell.insert("svg:rect", "circle")
.attr("x", padding / 2)
.attr("y", padding / 2)
.attr("width", size - padding)
.attr("height", size - padding)
.on("mousedown", mousedown);
// Titles for the diagonal.
cell.filter(function(d) { return d.i == d.j; }).append("svg:text")
.attr("x", padding)
.attr("y", padding)
.attr("dy", ".71em")
.text(function(d) { return d.x; });
function plot(p) {
d3.select(this).selectAll("circle")
.data(flower.values)
.enter().append("svg:circle")
.attr("cx", function(d) { return x[p.x](d[p.x]); })
.attr("cy", function(d) { return y[p.y](d[p.y]); })
.attr("r", 3)
.style("fill", function(d) { return color(d.species); });
}
d3.select(window)
.on("mousemove", mousemove)
.on("mouseup", mouseup);
var rect, x0, x1, count;
function mousedown() {
x0 = d3.svg.mouse(this);
count = 0;
rect = d3.select(this.parentNode).append("svg:rect").attr("class", "brush");
d3.event.preventDefault();
}
function mousemove() {
if (!rect) return;
x1 = d3.svg.mouse(rect.node());
x1[0] = Math.max(padding / 2, Math.min(size - padding / 2, x1[0]));
x1[1] = Math.max(padding / 2, Math.min(size - padding / 2, x1[1]));
var minx = Math.min(x0[0], x1[0]),
maxx = Math.max(x0[0], x1[0]),
miny = Math.min(x0[1], x1[1]),
maxy = Math.max(x0[1], x1[1]);
rect
.attr("x", minx - .5)
.attr("y", miny - .5)
.attr("width", maxx - minx + 1)
.attr("height", maxy - miny + 1);
var v = rect.node().__data__,
mins = x[v.x].invert(minx),
maxs = x[v.x].invert(maxx),
mint = y[v.y].invert(maxy),
maxt = y[v.y].invert(miny);
count = 0;
svg.selectAll("circle").classed("hidden", function(d) {
return (mins > d[v.x] || maxs < d[v.x]
|| mint > d[v.y] || maxt < d[v.y])
&& ++count;
});
}
function mouseup() {
if (!rect) return;
rect.remove();
rect = null;
if (!count) svg.selectAll("circle").classed("hidden", false);
}
});
function cross(a, b) {
var c = [], n = a.length, m = b.length, i, j;
for (i = -1; ++i < n;) for (j = -1; ++j < m;) c.push({x: a[i], i: i, y: b[j], j: j});
return c;
}
</script>
</body>
</html>