Juan Cruz neurobug

This example pulls together various examples of work with trees in D3.js.

The panning functionality can certainly be improved in my opinion and I would be thrilled to see better solutions contributed.

One can do all manner of housekeeping or server related calls on the drop event to manage a remote tree dataset for example.

Dragging can be performed on any node other than root (flare). Dropping can be done on any node.

Panning can either be done by dragging an empty part of the SVG around or dragging a node towards an edge.

	import React from 'react'
	import useCanvas from '../hooks/useCanvas'

	const Canvas = props => {
	const { draw, ...rest } = props
	const canvasRef = useCanvas(draw)

	return (
	<canvas ref={canvasRef} {...rest} />
	)

	import React from 'react'
	import useCanvas from '../hooks/useCanvas'

	const Canvas = props => {
	const { draw, ...rest } = props
	const canvasRef = useCanvas(draw)

	return (
	<canvas ref={canvasRef} {...rest} />
	)

	import { useRef, useEffect } from 'react'

	const useCanvas = (draw) => {

	const canvasRef = useRef(null)

	useEffect(() => {

	const canvas = canvasRef.current
	const context = canvas.getContext('2d')

	/**
	* Marlin 3D Printer Firmware
	* Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
	*
	* Based on Sprinter and grbl.
	* Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or

	// This example populate the 2016,2017 and 2018 holidays in Colombia
	[2016, 2017, 2018].forEach(function(year){
	var holidaysHelper = new HolidaysHelper(year);

	// Fixed
	[
	{month: HolidaysHelper.Months.January, day: 1, description: "Año Nuevo"},
	{month: HolidaysHelper.Months.May, day: 1, description: "Día del Trabajo"},
	{month: HolidaysHelper.Months.July, day: 20, description: "Grito de Independencia"},
	{month: HolidaysHelper.Months.August, day: 7, description: "Batalla de Boyacá"},

	.sticky {
	position: absolute;
	right: 0;
	z-index: 150;
	transform: rotate(5deg);
	width: 200px;
	min-height: 150px;
	margin: -10px 10px 10px;
	padding: 10px;
	font-family: "Comic Sans MS", "Comic Sans", "Chalkboard SE", "Comic Neue", cursive;

	/*
	(c) by Thomas Konings
	Random Name Generator for Javascript
	*/

	function capFirst(string) {
	return string.charAt(0).toUpperCase() + string.slice(1);
	}

	function getRandomInt(min, max) {