Rating.java

package be.multicu.core.util;

/**
 *
 * @author Codepanda
 */
public class Rating {

    private static int MAX_POINTS = 20;
    private static int MIN_POINTS = 4;

    /**
   * This method is used to determine the points for two players. This system
   * is based on the ELO system and has a min and max amount of points.
   * @param winner The current points of the winner
   * @param loser The current points of the loser
   * @return int This returns the point difference to be added/removed from players
   */
    public static int getELOPoints(int winner, int loser) {
        float elo = (float) (1f / (1f + Math.pow(10f, ((looser - winner) / 800f))));
        int points = (int) Math.round(20 * (1f - elo));
        if (points < MIN_POINTS) {
            points = MIN_POINTS;
        } else if (points > MAX_POINTS) {
            points = MAX_POINTS;
        }
        return points;
    }
}