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d3-chord.v2.js
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d3-chord.v2.js
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// https://d3js.org/d3-chord/ v2.0.0 Copyright 2020 Mike Bostock
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-path')) :
typeof define === 'function' && define.amd ? define(['exports', 'd3-path'], factory) :
(global = global || self, factory(global.d3 = global.d3 || {}, global.d3));
}(this, function (exports, d3Path) { 'use strict';
var abs = Math.abs;
var cos = Math.cos;
var sin = Math.sin;
var pi = Math.PI;
var halfPi = pi / 2;
var tau = pi * 2;
var max = Math.max;
var epsilon = 1e-12;
function range(i, j) {
return Array.from({length: j - i}, (_, k) => i + k);
}
function compareValue(compare) {
return function(a, b) {
return compare(
a.source.value + a.target.value,
b.source.value + b.target.value
);
};
}
function chord() {
return chord$1(false, false);
}
function chordTranspose() {
return chord$1(false, true);
}
function chordDirected() {
return chord$1(true, false);
}
function chord$1(directed, transpose) {
var padAngle = 0,
sortGroups = null,
sortSubgroups = null,
sortChords = null;
function chord(matrix) {
var n = matrix.length,
groupSums = new Array(n),
groupIndex = range(0, n),
chords = new Array(n * n),
groups = new Array(n),
k = 0, dx;
matrix = Float64Array.from({length: n * n}, transpose
? (_, i) => matrix[i % n][i / n | 0]
: (_, i) => matrix[i / n | 0][i % n]);
// Compute the scaling factor from value to angle in [0, 2pi].
for (let i = 0; i < n; ++i) {
let x = 0;
for (let j = 0; j < n; ++j) x += matrix[i * n + j] + directed * matrix[j * n + i];
k += groupSums[i] = x;
}
k = max(0, tau - padAngle * n) / k;
dx = k ? padAngle : tau / n;
// Compute the angles for each group and constituent chord.
{
let x = 0;
if (sortGroups) groupIndex.sort((a, b) => sortGroups(groupSums[a], groupSums[b]));
for (const i of groupIndex) {
const x0 = x;
if (directed) {
const subgroupIndex = range(~n + 1, n).filter(j => j < 0 ? matrix[~j * n + i] : matrix[i * n + j]);
if (sortSubgroups) subgroupIndex.sort((a, b) => sortSubgroups(a < 0 ? -matrix[~a * n + i] : matrix[i * n + a], b < 0 ? -matrix[~b * n + i] : matrix[i * n + b]));
for (const j of subgroupIndex) {
if (j < 0) {
const chord = chords[~j * n + i] || (chords[~j * n + i] = {source: null, target: null});
chord.target = {index: i, startAngle: x, endAngle: x += matrix[~j * n + i] * k, value: matrix[~j * n + i]};
} else {
const chord = chords[i * n + j] || (chords[i * n + j] = {source: null, target: null});
chord.source = {index: i, startAngle: x, endAngle: x += matrix[i * n + j] * k, value: matrix[i * n + j]};
}
}
groups[i] = {index: i, startAngle: x0, endAngle: x, value: groupSums[i]};
} else {
const subgroupIndex = range(0, n).filter(j => matrix[i * n + j] || matrix[j * n + i]);
if (sortSubgroups) subgroupIndex.sort((a, b) => sortSubgroups(matrix[i * n + a], matrix[i * n + b]));
for (const j of subgroupIndex) {
let chord;
if (i < j) {
chord = chords[i * n + j] || (chords[i * n + j] = {source: null, target: null});
chord.source = {index: i, startAngle: x, endAngle: x += matrix[i * n + j] * k, value: matrix[i * n + j]};
} else {
chord = chords[j * n + i] || (chords[j * n + i] = {source: null, target: null});
chord.target = {index: i, startAngle: x, endAngle: x += matrix[i * n + j] * k, value: matrix[i * n + j]};
if (i === j) chord.source = chord.target;
}
if (chord.source && chord.target && chord.source.value < chord.target.value) {
const source = chord.source;
chord.source = chord.target;
chord.target = source;
}
}
groups[i] = {index: i, startAngle: x0, endAngle: x, value: groupSums[i]};
}
x += dx;
}
}
// Remove empty chords.
chords = Object.values(chords);
chords.groups = groups;
return sortChords ? chords.sort(sortChords) : chords;
}
chord.padAngle = function(_) {
return arguments.length ? (padAngle = max(0, _), chord) : padAngle;
};
chord.sortGroups = function(_) {
return arguments.length ? (sortGroups = _, chord) : sortGroups;
};
chord.sortSubgroups = function(_) {
return arguments.length ? (sortSubgroups = _, chord) : sortSubgroups;
};
chord.sortChords = function(_) {
return arguments.length ? (_ == null ? sortChords = null : (sortChords = compareValue(_))._ = _, chord) : sortChords && sortChords._;
};
return chord;
}
var slice = Array.prototype.slice;
function constant(x) {
return function() {
return x;
};
}
function defaultSource(d) {
return d.source;
}
function defaultTarget(d) {
return d.target;
}
function defaultRadius(d) {
return d.radius;
}
function defaultStartAngle(d) {
return d.startAngle;
}
function defaultEndAngle(d) {
return d.endAngle;
}
function defaultPadAngle() {
return 0;
}
function defaultArrowheadRadius() {
return 10;
}
function ribbon(headRadius) {
var source = defaultSource,
target = defaultTarget,
sourceRadius = defaultRadius,
targetRadius = defaultRadius,
startAngle = defaultStartAngle,
endAngle = defaultEndAngle,
padAngle = defaultPadAngle,
context = null;
function ribbon() {
var buffer,
s = source.apply(this, arguments),
t = target.apply(this, arguments),
ap = padAngle.apply(this, arguments) / 2,
argv = slice.call(arguments),
sr = +sourceRadius.apply(this, (argv[0] = s, argv)),
sa0 = startAngle.apply(this, argv) - halfPi,
sa1 = endAngle.apply(this, argv) - halfPi,
tr = +targetRadius.apply(this, (argv[0] = t, argv)),
ta0 = startAngle.apply(this, argv) - halfPi,
ta1 = endAngle.apply(this, argv) - halfPi;
if (!context) context = buffer = d3Path.path();
if (ap > epsilon) {
if (abs(sa1 - sa0) > ap * 2 + epsilon) sa1 > sa0 ? (sa0 += ap, sa1 -= ap) : (sa0 -= ap, sa1 += ap);
else sa0 = sa1 = (sa0 + sa1) / 2;
if (abs(ta1 - ta0) > ap * 2 + epsilon) ta1 > ta0 ? (ta0 += ap, ta1 -= ap) : (ta0 -= ap, ta1 += ap);
else ta0 = ta1 = (ta0 + ta1) / 2;
}
context.moveTo(sr * cos(sa0), sr * sin(sa0));
context.arc(0, 0, sr, sa0, sa1);
if (sa0 !== ta0 || sa1 !== ta1) {
if (headRadius) {
var hr = +headRadius.apply(this, arguments), tr2 = tr - hr, ta2 = (ta0 + ta1) / 2;
context.quadraticCurveTo(0, 0, tr2 * cos(ta0), tr2 * sin(ta0));
context.lineTo(tr * cos(ta2), tr * sin(ta2));
context.lineTo(tr2 * cos(ta1), tr2 * sin(ta1));
} else {
context.quadraticCurveTo(0, 0, tr * cos(ta0), tr * sin(ta0));
context.arc(0, 0, tr, ta0, ta1);
}
}
context.quadraticCurveTo(0, 0, sr * cos(sa0), sr * sin(sa0));
context.closePath();
if (buffer) return context = null, buffer + "" || null;
}
if (headRadius) ribbon.headRadius = function(_) {
return arguments.length ? (headRadius = typeof _ === "function" ? _ : constant(+_), ribbon) : headRadius;
};
ribbon.radius = function(_) {
return arguments.length ? (sourceRadius = targetRadius = typeof _ === "function" ? _ : constant(+_), ribbon) : sourceRadius;
};
ribbon.sourceRadius = function(_) {
return arguments.length ? (sourceRadius = typeof _ === "function" ? _ : constant(+_), ribbon) : sourceRadius;
};
ribbon.targetRadius = function(_) {
return arguments.length ? (targetRadius = typeof _ === "function" ? _ : constant(+_), ribbon) : targetRadius;
};
ribbon.startAngle = function(_) {
return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant(+_), ribbon) : startAngle;
};
ribbon.endAngle = function(_) {
return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant(+_), ribbon) : endAngle;
};
ribbon.padAngle = function(_) {
return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant(+_), ribbon) : padAngle;
};
ribbon.source = function(_) {
return arguments.length ? (source = _, ribbon) : source;
};
ribbon.target = function(_) {
return arguments.length ? (target = _, ribbon) : target;
};
ribbon.context = function(_) {
return arguments.length ? ((context = _ == null ? null : _), ribbon) : context;
};
return ribbon;
}
function ribbon$1() {
return ribbon();
}
function ribbonArrow() {
return ribbon(defaultArrowheadRadius);
}
exports.chord = chord;
exports.chordDirected = chordDirected;
exports.chordTranspose = chordTranspose;
exports.ribbon = ribbon$1;
exports.ribbonArrow = ribbonArrow;
Object.defineProperty(exports, '__esModule', { value: true });
}));