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rsenderak / WF2 Show fleet direction

// ==UserScript==
// @name           WF2 Show fleet direction
// @namespace      sk.seko
// @description    Displays horizontal & vertical fleet direction ("o'clock")
// @updateURL      https://openuserjs.org/meta/rsenderak/wf2-fleet-helper.meta.js
// @downloadURL    https://openuserjs.org/install/rsenderak/wf2-fleet-helper.user.js
// @license        MIT
// @match          https://*.atmoburn.com/fleet.php*
// @match          https://*.atmoburn.com/fleet/*
// @version        4.1.2
// @grant          none
// ==/UserScript==

// Version 1.0 = Initial version
// Version 1.1 = fixed (removed) forgotten alert dialog
// Version 1.2 = Fixed @include after server protocol change from http to https
// Version 2.0 = Fixed for new WF (WF2); added vertical direction in degrees
// Version 3.0 = Atmoburn
// Version 3.1 = Fixed include
// Version 4.1 = Tweaks & fixes
// Version 4.1.1 = esversion set to 11
// Version 4.1.2 = small visual fix

/* jshint esversion: 11 */
/* jshint node: true */

"use strict";

var globalRegex = /^\s*(\-*\d+)[,\s]+(\-*\d+)[,\s]+(\-*\d+)/;

function xlog(msg) {
	console.log(`WF2SFD: ${msg}`);
}

function parse_xyz(s) {
	return s.match(globalRegex);
}

function rad2deg(angle) {
	return angle * 57.29577951308232; // angle / Math.PI * 180
}

function clock(p1, p2) {
	const dx = p2[1] - p1[1];
	const dy = p2[2] - p1[2];
	if (dx == 0 && dy == 0) {
		return '-';
	}
	var horiz = Math.round((rad2deg(Math.atan2(-dy, dx)) - 90 + 180) / 360 * 12);
	if (horiz < 0) {
		horiz += 12;
	} else if (horiz < 1) {
		horiz = 12;
	}
	return horiz;
}

function vert(p1, p2) {
	const dz = p2[3] - p1[3];
	if (dz == 0) {
		return 0;
	}
	const dx = p2[1] - p1[1];
	const dy = p2[2] - p1[2];
	const dxy = Math.round(Math.sqrt(dx*dx + dy*dy));
	if (dxy == 0) {
		return dz > 0 ? 90 : -90;
	}
	let vert = Math.round(rad2deg(Math.atan2(dz, dxy)));
	if (vert < -90) {
		vert = -180 - vert;
	} else if (vert > 90) {
		vert = 180 - vert;
	}
	return vert;
}

function showIt() {
	//xlog("showIt " + ignoreNext);

    if (ignoreNext) {
        ignoreNext = false;
        return;
    }

	const p2 = document.evaluate("//div[@id='missionPosition']//a/text()[contains(.,' global')]",
		document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
	if (!p2 || !p2.textContent || p2.textContent.indexOf(" global") < 0) {
		return;
	}

	const p1 = document.evaluate("//div[@id='navData']//div[@id='positionRight']//a/text()[contains(.,' global')]",
		document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
	if (!p1 || !p1.textContent || p1.textContent.indexOf(" global") < 0) {
		return;
	}

	const t1 = parse_xyz(p1.textContent);
	const t2 = parse_xyz(p2.textContent);
	const c = clock(t1, t2);
	const v = vert (t1, t2);
	const elem = document.createElement('span');
	const bs = "&nbsp;&nbsp;&nbsp;"; // big HTML space
	elem.innerHTML=`${bs}[<big>${c}′</big><small>${bs}${v}º</small>]`;
	elem.style.color = "yellow";
	elem.title = "Horizontal direction (in o'clock notation), and vertical direction (in degrees)";
	ignoreNext = true;
	eta.appendChild(elem);
}

var ignoreNext = false;
var eta = document.getElementById('mEta');
new MutationObserver(showIt).observe(eta, { attributes: false, childList: true, subtree: true });