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January 30, 2013 14:33
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a first D3js exercise to plot hourly electric power data over one day
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hour | power | |
---|---|---|
00 | 5.88 | |
01 | 5.51 | |
02 | 5.94 | |
03 | 6.84 | |
04 | 6.10 | |
05 | 5.80 | |
06 | 6.26 | |
07 | 4.64 | |
08 | 3.71 | |
09 | 3.30 | |
10 | 2.87 | |
11 | 2.09 | |
12 | 3.42 | |
13 | 4.85 | |
14 | 3.59 | |
15 | 3.12 | |
16 | 3.95 | |
17 | 3.96 | |
18 | 4.53 | |
19 | 4.54 | |
20 | 4.40 | |
21 | 4.76 | |
22 | 4.58 | |
23 | 3.74 |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<style> | |
body { | |
font-family: sans-serif; | |
} | |
svg { | |
font-size: 10px; | |
} | |
.axis path, | |
.axis line { | |
fill: none; | |
stroke: #000; | |
shape-rendering: crispEdges; | |
} | |
rect.bar { | |
stroke: #8AB; | |
fill: steelblue; | |
} | |
rect.bar:hover { | |
stroke: #ACD; | |
fill: #5aa2df; | |
} | |
text.bar { | |
fill: white; | |
} | |
.x.axis path { | |
//display: none; | |
} | |
</style> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
</head> | |
<body> | |
<h1> Consommation électrique de la journée </h1> | |
<p>(exprimée en puissance moyenne horaire)</p> | |
<script> | |
var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
width = 960 - margin.left - margin.right, | |
height = 500 - margin.top - margin.bottom; | |
var formatY = d3.format(".1f"); | |
var x = d3.scale.ordinal() | |
.rangeRoundBands([0, width], .0); | |
var y = d3.scale.linear() | |
.range([height, 0]); | |
var xAxis = d3.svg.axis() | |
.scale(x) | |
.orient("bottom"); | |
var yAxis = d3.svg.axis() | |
.scale(y) | |
.orient("left") | |
.tickFormat(formatY); | |
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 + ")"); | |
d3.tsv("daily_power.tsv", function(error, data) { | |
data.forEach(function(d) { | |
d.power = +d.power; | |
}); | |
x.domain(data.map(function(d) { return d.hour; })); | |
y.domain([0, d3.max(data, function(d) { return d.power*1.1; })]); | |
y.domain([0, 10.0 ]); | |
// axe X : heure | |
svg.append("g") | |
.attr("class", "x axis") | |
.attr("transform", "translate(0," + height + ")") | |
.call(xAxis) | |
.append("text") | |
.attr("x", width/2) | |
.attr("y", 6) | |
.attr("dy", "2em") | |
.style("text-anchor", "middle") | |
.text("heure de la journée"); | |
// axe Y : puissance | |
svg.append("g") | |
.attr("class", "y axis") | |
.call(yAxis) | |
.append("text") | |
.attr("transform", "rotate(-90)") | |
.attr("y", 6) | |
.attr("dy", ".71em") | |
.style("text-anchor", "end") | |
.text("Puissance (kW)"); | |
// graphiques en barres | |
svg.selectAll(".bar") | |
.data(data) | |
.enter().append("rect") | |
.attr("class", "bar") | |
.attr("x", function(d) { return x(d.hour); }) | |
.attr("width", x.rangeBand()) | |
.attr("y", function(d) { return y(d.power); }) | |
.attr("height", function(d) { return height - y(d.power); }); | |
// annotation des barres | |
svg.selectAll("text.bar") | |
.data(data) | |
.enter().append("text") | |
.attr("class", "bar") | |
.attr("x", function(d) { return x(d.hour)+x.rangeBand()/2; }) | |
.attr("y", function(d) { return y(d.power); }) | |
.attr("dx", 0) | |
.attr("dy", "1.2em") // vertical-align: middle | |
.attr("text-anchor", "middle") //horizontal align: middle | |
.text(function(d) { return formatY(d.power); }); | |
}); | |
</script> | |
<p>Exercice d'entrainement à D3.js, Pierre H. -- <em>30 janvier 2013</em></p> | |
<p>D'après | |
<a href="http://mbostock.github.com/d3/tutorial/bar-1.html">A Bar Chart, Part 1 Tutorial</a> et | |
<a href="http://bl.ocks.org/3885304">Bar Chart demo from D3 gallery</a> | |
</p> | |
<p>Pour faire un tracé dynamique (basé sur des données temps réel) : | |
<a href="http://mbostock.github.com/d3/tutorial/bar-2.html">A Bar Chart, Part 2 Tutorial</a> | |
</p> | |
<h3>Pour générer les données (en Python)</h3> | |
<p>(fichier <em>daily_power.tsv</em>)</p> | |
<pre> | |
In [1]: import random | |
In [2]: p = random.uniform(-1,1) | |
...: for h in range(24): | |
...: p = 0.7*random.uniform(-1,1) + 0.2*p | |
...: print('%02d\t%.2f' % (h, (p+1)*5)) | |
00 2.40 | |
01 5.35 | |
02 3.65 | |
03 4.10 | |
04 7.68 | |
05 2.78 | |
06 5.09 | |
07 5.75 | |
08 2.45 | |
09 4.89 | |
10 7.23 | |
11 6.48 | |
12 8.34 | |
13 7.92 | |
14 2.11 | |
15 4.17 | |
16 6.07 | |
17 2.35 | |
18 3.56 | |
19 8.14 | |
20 8.66 | |
21 2.79 | |
22 4.80 | |
23 6.05 | |
</pre> | |
</body> | |
</html> |
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