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May 6, 2018 13:56
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license: mit |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.line { | |
stroke: #f00; | |
stroke-width: 1.5px; | |
stroke-linecap: round; | |
} | |
.line--inactive { | |
stroke: #999; | |
stroke-width: 2px; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v4.min.js"></script> | |
<script> | |
var n = 100, | |
array = d3.shuffle(d3.range(n)), | |
actions = mergesort(array.slice()).reverse(); | |
var margin = {top: 180, right: 40, bottom: 180, left: 40}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
var y = d3.scaleBand() | |
.domain([1, 0]) | |
.rangeRound([height, 0]) | |
.padding(0.3); | |
var x = d3.scalePoint() | |
.domain(d3.range(n)) | |
.range([0, width]); | |
var a = d3.scaleLinear() | |
.domain([0, n - 1]) | |
.range([-35, 35]); | |
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.map((v, i) => { | |
return { | |
value: v, | |
index: i, | |
array: 0 | |
}; | |
})) | |
.enter().append("line") | |
.attr("transform", transform) | |
.attr("y2", -height/3); | |
var line0 = line.nodes(), | |
line1 = new Array(n); | |
var transition = d3.transition() | |
.duration(75) | |
.on("start", function start() { | |
var action = actions.pop(); | |
switch (action.type) { | |
case "merge": { | |
d3.selectAll(line0).attr("class", function(d, i) { | |
return action.left <= i && i < action.end ? null : "line--inactive"; | |
}); | |
break; | |
} | |
case "copy": { | |
var i = action[0], | |
j = action[1], | |
e = line1[j] = line0[i], | |
d = e.__data__; | |
d.index = j; | |
d.array = (d.array + 1) & 1; | |
transition.each(function() { | |
d3.select(e).transition().attr("transform", transform); | |
}); | |
break; | |
} | |
case "swap": { | |
var t = line0; | |
line0 = line1; | |
line1 = t; | |
break; | |
} | |
} | |
if (actions.length) transition = transition.transition().on("start", start); | |
}); | |
function transform(d) { | |
return "translate(" + x(d.index) + "," + y(d.array) + ")rotate(" + a(d.value) + ")"; | |
} | |
function mergesort(array) { | |
var actions = [], | |
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)); | |
} | |
actions.push({type: "swap"}); | |
array = array0, array0 = array1, array1 = array; | |
} | |
function merge(left, right, end) { | |
actions.push({type: "merge", left: left, end: end}); | |
for (var i0 = left, i1 = right, j = left; j < end; ++j) { | |
if (i0 < right && (i1 >= end || array0[i0] <= array0[i1])) { | |
array1[j] = array0[i0]; | |
actions.push({type: "copy", "0": i0++, "1": j}); | |
} else { | |
array1[j] = array0[i1]; | |
actions.push({type: "copy", "0": i1++, "1": j}); | |
} | |
} | |
} | |
return actions; | |
} | |
</script> |
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