index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
background: #000;
}
.line {
fill: none;
stroke: #000;
stroke-width: 6px;
stroke-linecap: round;
stroke-linejoin: round;
}
.line-halo {
stroke-linecap: butt;
stroke-width: 8px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="cubehelix.js"></script>
<script>
var n = 100,
array = d3.shuffle(d3.range(n)),
arrays = mergesort(array.slice()),
elements = d3.range(n).map(function(i) { return {value: i, indexes: []}; });
var color = d3.scale.cubehelix()
.domain([0, n / 2, n - 1])
.range([d3.hsl(-40, 1, .4), d3.hsl(60, 1, 1), d3.hsl(160, 1, .4)]);
arrays.forEach(function(array, t) {
array.forEach(function(value, i) {
elements[value].indexes.push({time: t, index: i});
});
});
var margin = {top: 20, right: 20, bottom: 20, left: 20},
strokeWidth = 6,
width = 960 - margin.left - margin.right,
height = 700 - margin.top - margin.bottom;
var x = d3.scale.ordinal()
.domain(d3.range(n))
.rangePoints([0, width]);
var y = d3.scale.ordinal()
.domain(d3.range(arrays.length))
.rangePoints([0, height]);
var line = d3.svg.line()
.interpolate(interpolateLine)
.x(function(d) { return x(d.index); })
.y(function(d) { return y(d.time); });
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
svg.append("g")
.attr("class", "line")
.selectAll("path")
.data(elements)
.enter().append("path")
.style("stroke", function(d) { return color(d.value); })
.attr("d", function(d) { return line(d.indexes); })
.select(function() { return this.parentNode.insertBefore(this.cloneNode(false), this); })
.attr("class", "line-halo")
.style("stroke", null);
function interpolateLine(points) {
var p0 = points[0],
x0 = p0[0],
y0 = p0[1],
path = [p0];
for (var i = 1, n = points.length, p1, x1, y1; i < n; ++i) {
p1 = points[i];
x1 = p1[0];
y1 = p1[1];
path.push("V", (y0 * 2 + y1) / 3, "L", x1, ",", (y0 + y1 * 2) / 3, "V", y1);
x0 = x1;
y0 = y1;
}
return path.join("");
}
function mergesort(array) {
var arrays = [array.slice()],
n = array.length,
array0 = array,
array1 = new Array(n);
for (var m = 1; m < n; m <<= 1) {
for (var i = 0; i < n; i += (m << 1)) {
merge(i, Math.min(i + m, n), Math.min(i + (m << 1), n));
}
arrays.push(array1.slice());
array = array0, array0 = array1, array1 = array;
}
function merge(left, right, end) {
for (var i0 = left, i1 = right, j = left; j < end; ++j) {
array1[j] = array0[i0 < right && (i1 >= end || array0[i0] <= array0[i1]) ? i0++ : i1++];
}
}
return arrays;
}
d3.select(self.frameElement).style("height", height + margin.top + margin.bottom + "px");
</script>
cubehelix.js
(function() {
var radians = Math.PI / 180;
d3.scale.cubehelix = function() {
return d3.scale.linear()
.range([d3.hsl(300, .5, 0), d3.hsl(-240, .5, 1)])
.interpolate(d3.interpolateCubehelix);
};
d3.interpolateCubehelix = d3_interpolateCubehelix(1);
d3.interpolateCubehelix.gamma = d3_interpolateCubehelix;
function d3_interpolateCubehelix(γ) {
return function(a, b) {
a = d3.hsl(a);
b = d3.hsl(b);
var ah = (a.h + 120) * radians,
bh = (b.h + 120) * radians - ah,
as = a.s,
bs = b.s - as,
al = a.l,
bl = b.l - al;
if (isNaN(bs)) bs = 0, as = isNaN(as) ? b.s : as;
if (isNaN(bh)) bh = 0, ah = isNaN(ah) ? b.h : ah;
return function(t) {
var h = ah + bh * t,
l = Math.pow(al + bl * t, γ),
a = (as + bs * t) * l * (1 - l);
return "#"
+ hex(l + a * (-0.14861 * Math.cos(h) + 1.78277 * Math.sin(h)))
+ hex(l + a * (-0.29227 * Math.cos(h) - 0.90649 * Math.sin(h)))
+ hex(l + a * (+1.97294 * Math.cos(h)));
};
};
}
function hex(v) {
var s = (v = v <= 0 ? 0 : v >= 1 ? 255 : v * 255 | 0).toString(16);
return v < 0x10 ? "0" + s : s;
}
})();