Skip to content

Instantly share code, notes, and snippets.

@emeeks
Last active March 18, 2016 03:34
Show Gist options
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
  • Save emeeks/5ada6a7d00115f0e2f1e to your computer and use it in GitHub Desktop.
Save emeeks/5ada6a7d00115f0e2f1e to your computer and use it in GitHub Desktop.
Ch. 5, Fig. 6 - D3.js in Action

This is the code for Chapter 5 from D3.js in Action demonstrating how to make a donut chart using d3.layout.pie() and how to transition it using attrTween to calculate the transition arcs.

<html>
<head>
<title>D3 in Action Chapter 5 - Example 3</title>
<meta charset="utf-8" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
</head>
<style>
svg {
height: 500px;
width: 500px;
border: 1px solid gray;
}
</style>
<body>
<div id="viz">
<svg>
</svg>
</div>
</body>
<footer>
<script>
d3.json("tweets.json",function(error,data) {dataViz(data.tweets)});
function dataViz(incData) {
nestedTweets = d3.nest()
.key(function (el) {return el.user})
.entries(incData);
var colorScale = d3.scale.category10([0,1,2,3]);
nestedTweets.forEach(function (el) {
el.numTweets = el.values.length
el.numFavorites = d3.sum(el.values, function (d) {return d.favorites.length});
el.numRetweets = d3.sum(el.values, function (d) {return d.retweets.length});
})
pieChart = d3.layout.pie().sort(null);
pieChart.value(function(d) {return d.numTweets});
newArc = d3.svg.arc();
newArc.outerRadius(100).innerRadius(20);
d3.select("svg")
.append("g")
.attr("transform","translate(250,250)")
.selectAll("path")
.data(pieChart(nestedTweets), function(d) {return d.data.key})
.enter()
.append("path")
.attr("d", newArc)
.style("fill", function(d, i) {return colorScale(i)})
.style("opacity", .5)
.style("stroke", "black")
.style("stroke-width", "2px")
.each(function(d) { this._current = d; });
function arcTween(a) {
var i = d3.interpolate(this._current, a);
this._current = i(0);
return function(t) {
return newArc(i(t));
};
}
}
</script>
</footer>
</html>
{
"tweets": [
{"user": "Al", "content": "I really love seafood.", "timestamp": " Mon Dec 23 2013 21:30 GMT-0800 (PST)", "retweets": ["Raj","Pris","Roy"], "favorites": ["Sam"]},
{"user": "Al", "content": "I take that back, this doesn't taste so good.", "timestamp": "Mon Dec 23 2013 21:55 GMT-0800 (PST)", "retweets": ["Roy"], "favorites": []},
{"user": "Al", "content": "From now on, I'm only eating cheese sandwiches.", "timestamp": "Mon Dec 23 2013 22:22 GMT-0800 (PST)", "retweets": [], "favorites": ["Roy","Sam"]},
{"user": "Roy", "content": "Great workout!", "timestamp": " Mon Dec 23 2013 7:20 GMT-0800 (PST)", "retweets": [], "favorites": []},
{"user": "Roy", "content": "Spectacular oatmeal!", "timestamp": " Mon Dec 23 2013 7:23 GMT-0800 (PST)", "retweets": [], "favorites": []},
{"user": "Roy", "content": "Amazing traffic!", "timestamp": " Mon Dec 23 2013 7:47 GMT-0800 (PST)", "retweets": [], "favorites": []},
{"user": "Roy", "content": "Just got a ticket for texting and driving!", "timestamp": " Mon Dec 23 2013 8:05 GMT-0800 (PST)", "retweets": [], "favorites": ["Sam", "Sally", "Pris"]},
{"user": "Pris", "content": "Going to have some boiled eggs.", "timestamp": " Mon Dec 23 2013 18:23 GMT-0800 (PST)", "retweets": [], "favorites": ["Sally"]},
{"user": "Pris", "content": "Maybe practice some gymnastics.", "timestamp": " Mon Dec 23 2013 19:47 GMT-0800 (PST)", "retweets": [], "favorites": ["Sally"]},
{"user": "Sam", "content": "@Roy Let's get lunch", "timestamp": " Mon Dec 23 2013 11:05 GMT-0800 (PST)", "retweets": ["Pris"], "favorites": ["Sally", "Pris"]}
]
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment