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@sghall /gist:7859113
Last active May 13, 2017

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Helper function for creating a d3 chord diagram
// blog-post - http://www.delimited.io/blog/2013/12/8/chord-diagrams-in-d3
//*******************************************************************
// CHORD MAPPER
//*******************************************************************
function chordMpr (data) {
var mpr = {}, mmap = {}, n = 0,
matrix = [], filter, accessor;
mpr.setFilter = function (fun) {
filter = fun;
return this;
},
mpr.setAccessor = function (fun) {
accessor = fun;
return this;
},
mpr.getMatrix = function () {
matrix = [];
_.each(mmap, function (a) {
if (!matrix[a.id]) matrix[a.id] = [];
_.each(mmap, function (b) {
var recs = _.filter(data, function (row) {
return filter(row, a, b);
})
matrix[a.id][b.id] = accessor(recs, a, b);
});
});
return matrix;
},
mpr.getMap = function () {
return mmap;
},
mpr.printMatrix = function () {
_.each(matrix, function (elem) {
console.log(elem);
})
},
mpr.addToMap = function (value, info) {
if (!mmap[value]) {
mmap[value] = { name: value, id: n++, data: info }
}
},
mpr.addValuesToMap = function (varName, info) {
var values = _.uniq(_.pluck(data, varName));
_.map(values, function (v) {
if (!mmap[v]) {
mmap[v] = { name: v, id: n++, data: info }
}
});
return this;
}
return mpr;
}
//*******************************************************************
// CHORD READER
//*******************************************************************
function chordRdr (matrix, mmap) {
return function (d) {
var i,j,s,t,g,m = {};
if (d.source) {
i = d.source.index; j = d.target.index;
s = _.where(mmap, {id: i });
t = _.where(mmap, {id: j });
m.sname = s[0].name;
m.sdata = d.source.value;
m.svalue = +d.source.value;
m.stotal = _.reduce(matrix[i], function (k, n) { return k + n }, 0);
m.tname = t[0].name;
m.tdata = d.target.value;
m.tvalue = +d.target.value;
m.ttotal = _.reduce(matrix[j], function (k, n) { return k + n }, 0);
} else {
g = _.where(mmap, {id: d.index });
m.gname = g[0].name;
m.gdata = g[0].data;
m.gvalue = d.value;
}
m.mtotal = _.reduce(matrix, function (m1, n1) {
return m1 + _.reduce(n1, function (m2, n2) { return m2 + n2}, 0);
}, 0);
return m;
}
}
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