OGS Glicko to Rank

ogs_glicko2rank.js

// ==UserScript==
// @name         OGS Glicko to Rank
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Convert Glicko ratings to dan/kyu ranks.
// @author       Andy Olsen
// @match        https://online-go.com/player/*
// @grant        none
// ==/UserScript==

// This script modifies the user profile page and replaces the Glicko ratings with traditional dan/kyu ratings.
//
// Formulas:
// glicko = 850*exp(0.032*r)
// r = ln(glicko/850)/0.032
//
// Table to convert from r to dan/kyu:
// Each entry is the weakest of that rank. So r=30 is the weakest 1d.
// r=38= 9d
// r=30= 1d
// r=29= 1k
// r= 0=30k
//
// This script displays kyus as: strong 1k = -1.0k, weak 1k = -1.9k.
// OGS displays this as:         strong 1k = -0.0k, weak 1k = -0.9k.
// I prefer it this way, same as AGA ratings. But maybe it would be better to
// be consistent with OGS. Feedback welcome.


$(document).ready(function() {
    'use strict';
    waitForKeyElements ("div.rating", glicko2rank);
    //waitForKeyElements ("svg.chart", modifyRatingsChart);  // Not working yet
});

function glicko2rank (jNode) {
    var e2 = document.getElementsByClassName("rating");
    for (var i = 0; i < e2.length; i++) {
        var ratingElement = e2[i].getElementsByClassName("left")[0];
        if (!ratingElement) { continue; }  // There is also "rating line" class. Not sure how to exclude it, so just abort when there isn't a "left" class under it.
        var ratingStr = ratingElement.textContent;
        if (!/[a-zA-Z]/.test(ratingStr)) {
            var ratingInt = parseInt(ratingStr, 10);
            var ratingRangeElement = e2[i].getElementsByClassName("right")[0];
            var ratingRangeInt = parseInt(ratingRangeElement.textContent, 10);
            var r = Math.log(ratingInt/850.0)/0.032;
            var rRange = Math.log((ratingInt+ratingRangeInt)/850.0)/0.032 - r;
            var rank;
            if (r >= 30) {
                rank = "" + (r-29).toFixed(1) + "d";
            } else {
                rank = "-" + (31-r).toFixed(1) + "k";
            }
            var rankRange = rRange.toFixed(1);
            //console.log(ratingInt, ratingRangeInt, r, rRange, rank, rankRange);
            ratingElement.textContent = rank;
            ratingRangeElement.textContent = rankRange;
        }
    }
}

// Not working yet
// Trying to increase the chart height
function modifyRatingsChart(jNode) {
    var ratingsChart = document.getElementsByClassName("RatingsChart");
    console.log(ratingsChart);
    chart = ratingsChart[0].getElementsByClassName("chart")[0];
    console.log(chart);
    console.log(chart.height);
    chart.height = 600;
    console.log(chart.height);
}

// waitForKeyElements Source:
// https://gist.github.com/zapu/cb24cce69a180df81e12

/*--- waitForKeyElements():  A utility function, for Greasemonkey scripts,
    that detects and handles AJAXed content.

    IMPORTANT: This function requires your script to have loaded jQuery.
*/

function waitForKeyElements (
    selectorTxt,    /* Required: The jQuery selector string that
                        specifies the desired element(s).
                    */
    actionFunction, /* Required: The code to run when elements are
                        found. It is passed a jNode to the matched
                        element.
                    */
    bWaitOnce,      /* Optional: If false, will continue to scan for
                        new elements even after the first match is
                        found.
                    */
    iframeSelector  /* Optional: If set, identifies the iframe to
                        search.
                    */
) {
    var targetNodes, btargetsFound;

    if (typeof iframeSelector == "undefined")
        targetNodes     = $(selectorTxt);
    else
        targetNodes     = $(iframeSelector).contents ()
                                           .find (selectorTxt);

    if (targetNodes  &&  targetNodes.length > 0) {
        btargetsFound   = true;
        /*--- Found target node(s).  Go through each and act if they
            are new.
        */
        targetNodes.each ( function () {
            var jThis        = $(this);
            var alreadyFound = jThis.data ('alreadyFound')  ||  false;

            if (!alreadyFound) {
                //--- Call the payload function.
                var cancelFound     = actionFunction (jThis);
                if (cancelFound)
                    btargetsFound   = false;
                else
                    jThis.data ('alreadyFound', true);
            }
        } );
    }
    else {
        btargetsFound   = false;
    }

    //--- Get the timer-control variable for this selector.
    var controlObj      = waitForKeyElements.controlObj  ||  {};
    var controlKey      = selectorTxt.replace (/[^\w]/g, "_");
    var timeControl     = controlObj [controlKey];

    //--- Now set or clear the timer as appropriate.
    if (btargetsFound  &&  bWaitOnce  &&  timeControl) {
        //--- The only condition where we need to clear the timer.
        clearInterval (timeControl);
        delete controlObj [controlKey];
    }
    else {
        //--- Set a timer, if needed.
        if ( ! timeControl) {
            timeControl = setInterval ( function () {
                    waitForKeyElements (    selectorTxt,
                                            actionFunction,
                                            bWaitOnce,
                                            iframeSelector
                                        );
                },
                300
            );
            controlObj [controlKey] = timeControl;
        }
    }
    waitForKeyElements.controlObj   = controlObj;
}