桌上足球Rank排名算法

table-footbal-rank.js

var playersMap = {
	"舒克": 1200,
	"迟伤": 1200,
	"沙陀": 1200,
	"皓勋": 1200,
	"圣耀": 1200,
	"懂象": 1200,
	"青也": 1200,
	"呼荣": 1200
};

var gamelogs = [
	{
		victors: ['舒克', '迟伤'],
		losers:  ['青也', '呼荣']
	},
	{
		victors: ['舒克', '迟伤'],
		losers:  ['懂象', '圣耀']
	},
	{
		victors: ['舒克', '迟伤'],
		losers:  ['沙陀', '皓勋']
	},

	{
		victors: ['舒克', '迟伤'],
		losers:  ['青也', '呼荣']
	},
	{
		victors: ['舒克', '迟伤'],
		losers:  ['懂象', '圣耀']
	},
	{
		victors: ['舒克', '迟伤'],
		losers:  ['沙陀', '皓勋']
	},

	{
		victors: ['懂象', '圣耀'],
		losers:  ['青也', '呼荣']
	},
	{
		victors: ['沙陀', '皓勋'],
		losers:  ['懂象', '圣耀']
	},
	{
		victors: ['青也', '皓勋'],
		losers:  ['舒克', '迟伤']
	},
];

function main(){
	gamelogs.forEach(function(game){
		rank(game.victors, game.losers)
	});
}

function average(array){

	if(!array || array.length === 0){
		return null;
	}

	var sum = 0;
	array.forEach(function(num){
		sum += num;
	});

	return sum/array.length;
}

function getRanks(players){
	
	if(!players || players.length === 0){
		return null;
	}

	var ranks = [];

	players.forEach(function(name){
		ranks.push(playersMap[name]);
	});

	return ranks;
}

function setRanks(players, ranks){

	if(!players || players.length === 0 || !ranks || ranks.length === 0){
		return null;
	}

	ranks.forEach(function(rank, i){
		playersMap[players[i]] = rank;
	})

}


function rank(victors, losers){
	var victorsRanks = getRanks(victors);
	var victorsAverage = average(victorsRanks);

	var losersRanks = getRanks(losers);
	var losersAverage = average(losersRanks);
	var result = rankCore(victorsAverage, losersAverage);

	victorsRanks = victorsRanks.map(function(rank){
		return rank + result.victorChange;
	});

	losersRanks = losersRanks.map(function(rank){
		return rank + result.loserChange;
	});
	// 设置分数
	setRanks(victors, victorsRanks)
	setRanks(losers, losersRanks)
}

function rankCore(victor, loser){
	var Evictor = 1 / ( 1 + Math.pow(10, (loser - victor)/400) );
	var Eloser = 1 / ( 1 + Math.pow(10, (victor - loser)/400) );

	var result = {};

	result.victor = victor + 16 * ( 1 - Evictor );
	result.victorChange = result.victor - victor;
	
	result.loser = loser + 16 * ( 0 - Eloser );
	result.loserChange = result.loser - loser;
	
	return result;
}


main();

console.log(playersMap);