An improved animation of Fisher–Yates shuffle, showing the shuffled part of the array in black.
Shuffle II
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.line { | |
stroke: #000; | |
stroke-width: 1.5px; | |
stroke-linecap: round; | |
} | |
.line--inactive { | |
stroke: #ddd; | |
stroke-width: 1px; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var n = 200, | |
array = d3.range(n), | |
swaps = shuffle(array.slice()).reverse(); | |
var margin = {top: 230, right: 40, bottom: 230, left: 40}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
var x = d3.scale.ordinal() | |
.domain(d3.range(n)) | |
.rangePoints([0, width]); | |
var a = d3.scale.linear() | |
.domain([0, n - 1]) | |
.range([-45, 45]); | |
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 + ")"); | |
var line = svg.append("g") | |
.attr("class", "line") | |
.selectAll("line") | |
.data(array) | |
.enter().append("line") | |
.attr("transform", transform) | |
.attr("class", "line--inactive") | |
.attr("y2", -height); | |
var transition = d3.transition() | |
.duration(150) | |
.each("start", function start() { | |
var swap = swaps.pop(), | |
i = swap[0], | |
j = swap[1], | |
li = line[0][i], | |
lj = line[0][j]; | |
line[0][i] = lj; | |
line[0][j] = li; | |
d3.select(lj).attr("class", null); | |
transition.each(function() { line.transition().attr("transform", transform); }); | |
if (swaps.length) transition = transition.transition().each("start", start); | |
}); | |
function transform(d, i) { | |
return "translate(" + x(i) + "," + height + ")rotate(" + a(d) + ")"; | |
} | |
function shuffle(array) { | |
var swaps = [], | |
m = array.length, | |
t, | |
i; | |
while (m) { | |
i = Math.floor(Math.random() * m--); | |
t = array[m]; | |
array[m] = array[i]; | |
array[i] = t; | |
swaps.push([m, i]); | |
} | |
return swaps; | |
} | |
</script> |
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