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Crossing the streams
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8" /> | |
<style> | |
path { | |
fill: none; | |
stroke-width: 2px; | |
stroke-linejoin: round; | |
stroke: #444; | |
} | |
.red path { | |
fill: #ba3e2d; | |
} | |
.orange path { | |
fill: #ff7d3e; | |
} | |
.teal path { | |
fill: #83dfc3; | |
} | |
.blue path { | |
fill: #4c8da1; | |
} | |
.yellow path { | |
fill: #ffea60; | |
} | |
</style> | |
</head> | |
<body> | |
<div></div> | |
<script src=" | |
https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.17/d3.min.js"></script> | |
<script> | |
var margin = { top: 10, right: 10, left: 10, bottom: 10 }, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom, | |
colorOrder = ["teal","red","yellow","orange","blue"]; | |
var line = d3.svg.line(); | |
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 + " )"); | |
// Make some random data | |
var ribbons = d3.range(1980,2005, 0.5).map(function(year,i){ | |
return({ | |
id: i, // doesn't matter what this is as long as it's unique | |
color: colorOrder[Math.floor(Math.random()*colorOrder.length)], | |
startYear: Math.floor(year) | |
}); | |
}); | |
// For each year, get an array of ribbons shown, in order (IDs only) | |
var positionsByYear = d3.range(1980,2005).map(function(year){ | |
return ribbons.filter(function(d){ | |
return d.startYear <= year; // ignore ribbons that haven't started | |
}).sort(sorter).map(function(d){ | |
return d.id; | |
}); | |
}); | |
// Pick the one you want to keep flat | |
// Could set this manually to the ID you care about | |
var baselineId = positionsByYear[0][0], | |
baselineRow = positionsByYear[positionsByYear.length - 1].indexOf(baselineId); | |
// Move positions down so the baseline ID is always at the same vertical index | |
positionsByYear.forEach(function(year){ | |
while (year.indexOf(baselineId) < baselineRow) { | |
year.unshift(null); | |
} | |
}); | |
// Pixel scales | |
var x = d3.scale.ordinal() | |
.domain(d3.range(-1,positionsByYear.length)) | |
.rangeBands([0,width]); | |
var y = d3.scale.ordinal() | |
.domain(d3.range(ribbons.length + 1)) | |
.rangeBands([0,height]); | |
// Construct X/Y coordinate pairs per ribbon | |
ribbons.forEach(function(ribbon){ | |
var top = [], // Line along the top | |
bottom = []; // Line along the bottom | |
positionsByYear.forEach(function(year,i){ | |
// Vertical position | |
var position = year.indexOf(ribbon.id); | |
if (position >= 0) { | |
// Add one extra miter-y point at the beginning | |
if (!top.length) { | |
if (ribbon.id === baselineId) { | |
top.push([x(i-1),(y(position) + y(position + 1)) / 2]); | |
} else if (position > baselineRow) { | |
// TODO smarter | |
var numBefore = ribbons.filter(function(r){ | |
var index = year.indexOf(r.id); | |
return index > baselineRow && index < position && r.startYear === ribbon.startYear; | |
}).length; | |
top.push([x(i-1),y(position - numBefore)]); | |
} else { | |
// TODO smarter | |
var numAfter = ribbons.filter(function(r){ | |
var index = year.indexOf(r.id); | |
return index < baselineRow && index > position && r.startYear === ribbon.startYear; | |
}).length; | |
top.push([x(i-1),y(position + 1 + numAfter)]); | |
} | |
} | |
// Add the top and bottom point | |
top.push([x(i),y(position)]); | |
bottom.unshift([x(i),y(position + 1)]); | |
} | |
}); | |
// Combine the whole path | |
ribbon.positions = top.concat(bottom); | |
}); | |
var paths = svg.selectAll("g") | |
.data(ribbons) | |
.enter() | |
.append("g") | |
.attr("class",function(d){ | |
return d.color; | |
}); | |
paths.append("path") | |
.attr("d",function(d){ | |
return line(d.positions) + "Z"; | |
}); | |
// What order should the ribbons be stacked in for any given X? | |
function sorter(a,b){ | |
var ia = colorOrder.indexOf(a.color), | |
ib = colorOrder.indexOf(b.color), | |
ga = a.startYear, | |
gb = b.startYear; | |
// sort by color group first | |
if (ia !== ib) { | |
return ia - ib; | |
} | |
// then within the group | |
if (ga !== gb) { | |
return ga - gb; | |
} | |
// tiebreaker | |
return a.id - b.id; | |
} | |
</script> | |
</body> | |
</html> |
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