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// https://d3js.org/d3-timer/ v3.0.1 Copyright 2010-2021 Mike Bostock
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.d3 = global.d3 || {}));
}(this, (function (exports) { 'use strict';
var frame = 0, // is an animation frame pending?
timeout$1 = 0, // is a timeout pending?
interval$1 = 0, // are any timers active?
pokeDelay = 1000, // how frequently we check for clock skew
taskHead,
taskTail,
clockLast = 0,
clockNow = 0,
clockSkew = 0,
clock = typeof performance === "object" && performance.now ? performance : Date,
setFrame = typeof window === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function(f) { setTimeout(f, 17); };
function now() {
return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
}
function clearNow() {
clockNow = 0;
}
function Timer() {
this._call =
this._time =
this._next = null;
}
Timer.prototype = timer.prototype = {
constructor: Timer,
restart: function(callback, delay, time) {
if (typeof callback !== "function") throw new TypeError("callback is not a function");
time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
if (!this._next && taskTail !== this) {
if (taskTail) taskTail._next = this;
else taskHead = this;
taskTail = this;
}
this._call = callback;
this._time = time;
sleep();
},
stop: function() {
if (this._call) {
this._call = null;
this._time = Infinity;
sleep();
}
}
};
function timer(callback, delay, time) {
var t = new Timer;
t.restart(callback, delay, time);
return t;
}
function timerFlush() {
now(); // Get the current time, if not already set.
++frame; // Pretend we’ve set an alarm, if we haven’t already.
var t = taskHead, e;
while (t) {
if ((e = clockNow - t._time) >= 0) t._call.call(undefined, e);
t = t._next;
}
--frame;
}
function wake() {
clockNow = (clockLast = clock.now()) + clockSkew;
frame = timeout$1 = 0;
try {
timerFlush();
} finally {
frame = 0;
nap();
clockNow = 0;
}
}
function poke() {
var now = clock.now(), delay = now - clockLast;
if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
}
function nap() {
var t0, t1 = taskHead, t2, time = Infinity;
while (t1) {
if (t1._call) {
if (time > t1._time) time = t1._time;
t0 = t1, t1 = t1._next;
} else {
t2 = t1._next, t1._next = null;
t1 = t0 ? t0._next = t2 : taskHead = t2;
}
}
taskTail = t0;
sleep(time);
}
function sleep(time) {
if (frame) return; // Soonest alarm already set, or will be.
if (timeout$1) timeout$1 = clearTimeout(timeout$1);
var delay = time - clockNow; // Strictly less than if we recomputed clockNow.
if (delay > 24) {
if (time < Infinity) timeout$1 = setTimeout(wake, time - clock.now() - clockSkew);
if (interval$1) interval$1 = clearInterval(interval$1);
} else {
if (!interval$1) clockLast = clock.now(), interval$1 = setInterval(poke, pokeDelay);
frame = 1, setFrame(wake);
}
}
function timeout(callback, delay, time) {
var t = new Timer;
delay = delay == null ? 0 : +delay;
t.restart(elapsed => {
t.stop();
callback(elapsed + delay);
}, delay, time);
return t;
}
function interval(callback, delay, time) {
var t = new Timer, total = delay;
if (delay == null) return t.restart(callback, delay, time), t;
t._restart = t.restart;
t.restart = function(callback, delay, time) {
delay = +delay, time = time == null ? now() : +time;
t._restart(function tick(elapsed) {
elapsed += total;
t._restart(tick, total += delay, time);
callback(elapsed);
}, delay, time);
};
t.restart(callback, delay, time);
return t;
}
exports.interval = interval;
exports.now = now;
exports.timeout = timeout;
exports.timer = timer;
exports.timerFlush = timerFlush;
Object.defineProperty(exports, '__esModule', { value: true });
})));