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.
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Ch. 5, Fig. 6 - D3.js in Action
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<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> |
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{ | |
"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"]} | |
] | |
} | |
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