Created
July 29, 2014 04:12
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streaming streamgraph
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
path.layer{ | |
fill-opacity: 0.8; | |
stroke-opacity: 1; | |
stroke: white; | |
stroke-width: 2px; | |
} | |
</style> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<!--<script src="../lib/d3.js"></script>--> | |
<div class="chart"> | |
</div> | |
<script> | |
var layerCount = 4; | |
var pointCount = 100; | |
function generateDataPoint(_index){ | |
return d3.range(layerCount).map(function(dB, iB){ | |
buffer[iB] += (Math.random()) - 0.5; | |
buffer[iB] = Math.max(buffer[iB], 0.1); | |
return {key: 'Line'+iB, value: buffer[iB], date: _index}; | |
}); | |
} | |
var buffer = d3.range(layerCount).map(function(d, i){ return 0; }); | |
var data = d3.merge(d3.range(pointCount).map(function(d, i){ return generateDataPoint(i);})); | |
var width = 800; | |
var height = 400; | |
var x = d3.scale.linear().domain(d3.extent(data, function(d) { return d.date; })).range([0, width]); | |
var y = d3.scale.linear().range([height, 0]); | |
var colors = d3.scale.ordinal().range(['#4597ad', '#dc5f50', '#89c562', '#b85787', '#ebbb46', '#7376c1', '#d17c48', '#75c5ac', '#98a5b8', '#c895dc'].concat(d3.scale.category20().range())); | |
var stack = d3.layout.stack() | |
.offset('silhouette') | |
.values(function(d){ return d.values; }) | |
.x(function(d){ return d.date; }) | |
.y(function(d){ return d.value; }); | |
var nest = d3.nest() | |
.key(function(d){ return d.key; }); | |
var area = d3.svg.area() | |
.interpolate('cardinal') | |
.x(function(d){ return x(d.date); }) | |
.y0(function(d){ return y(d.y0); }) | |
.y1(function(d){ return y(d.y0 + d.y); }); | |
var svg = d3.select('.chart').append('svg') | |
.attr('width', width) | |
.attr('height', height); | |
function update(){ | |
var newDataPoint = generateDataPoint(pointCount); | |
pointCount++; | |
data = data.slice(layerCount).concat(newDataPoint); | |
var dataLayers = stack(nest.entries(data)); | |
x.domain(d3.extent(data, function(d) { return d.date; })); | |
y.domain([0, d3.max(data, function(d) { return d.y0 + d.y; })]); | |
var layers = svg.selectAll('.layer') | |
.data(dataLayers); | |
layers.enter().append('path') | |
.attr('class', 'layer'); | |
layers.attr('d', function(d){ return area(d.values); }) | |
.style('fill', function(d, i){ return colors(d.key); }); | |
} | |
setInterval(update, 1000); | |
</script> |
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