Added ExperienceManager

src/main/java/org/vindicterra/vindicterraLib/entities/players/ExperienceManager.java

@@ -0,0 +1,101 @@
+package org.vindicterra.vindicterraLib.entities.players;
+/*
+AUTHOR: Dev_Richard (https://www.spigotmc.org/members/dev_richard.38792/)
+DESC: A simple and easy to use class that can get and set a player's total experience points.
+
+Feel free to use this class in both public and private plugins, however if you release your
+plugin please link to this gist publicly so that others can contribute and benefit from it.
+*/
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.List;
+
+import org.bukkit.entity.Player;
+
+public class ExperienceManager {
+
+    private Player player;
+
+    public ExperienceManager(Player player) {
+        this.player = player;
+    }
+
+    public int getTotalExperience() {
+        int experience = 0;
+        int level = player.getLevel();
+        if(level >= 0 && level <= 15) {
+            experience = (int) Math.ceil(Math.pow(level, 2) + (6 * level));
+            int requiredExperience = 2 * level + 7;
+            double currentExp = Double.parseDouble(Float.toString(player.getExp()));
+            experience += Math.ceil(currentExp * requiredExperience);
+            return experience;
+        } else if(level > 15 && level <= 30) {
+            experience = (int) Math.ceil((2.5 * Math.pow(level, 2) - (40.5 * level) + 360));
+            int requiredExperience = 5 * level - 38;
+            double currentExp = Double.parseDouble(Float.toString(player.getExp()));
+            experience += Math.ceil(currentExp * requiredExperience);
+            return experience;
+        } else {
+            experience = (int) Math.ceil(((4.5 * Math.pow(level, 2) - (162.5 * level) + 2220)));
+            int requiredExperience = 9 * level - 158;
+            double currentExp = Double.parseDouble(Float.toString(player.getExp()));
+            experience += Math.ceil(currentExp * requiredExperience);
+            return experience;
+        }
+    }
+
+    public void setTotalExperience(int xp) {
+        //Levels 0 through 15
+        if(xp >= 0 && xp < 351) {
+            //Calculate Everything
+            int a = 1; int b = 6; int c = -xp;
+            int level = (int) (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
+            int xpForLevel = (int) (Math.pow(level, 2) + (6 * level));
+            int remainder = xp - xpForLevel;
+            int experienceNeeded = (2 * level) + 7;
+            float experience = (float) remainder / (float) experienceNeeded;
+            experience = round(experience, 2);
+
+            //Set Everything
+            player.setLevel(level);
+            player.setExp(experience);
+            //Levels 16 through 30
+        } else if(xp >= 352 && xp < 1507) {
+            //Calculate Everything
+            double a = 2.5; double b = -40.5; int c = -xp + 360;
+            double dLevel = (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
+            int level = (int) Math.floor(dLevel);
+            int xpForLevel = (int) (2.5 * Math.pow(level, 2) - (40.5 * level) + 360);
+            int remainder = xp - xpForLevel;
+            int experienceNeeded = (5 * level) - 38;
+            float experience = (float) remainder / (float) experienceNeeded;
+            experience = round(experience, 2);
+
+            //Set Everything
+            player.setLevel(level);
+            player.setExp(experience);
+            //Level 31 and greater
+        } else {
+            //Calculate Everything
+            double a = 4.5; double b = -162.5; int c = -xp + 2220;
+            double dLevel = (-b + Math.sqrt(Math.pow(b, 2) - (4 * a * c))) / (2 * a);
+            int level = (int) Math.floor(dLevel);
+            int xpForLevel = (int) (4.5 * Math.pow(level, 2) - (162.5 * level) + 2220);
+            int remainder = xp - xpForLevel;
+            int experienceNeeded = (9 * level) - 158;
+            float experience = (float) remainder / (float) experienceNeeded;
+            experience = round(experience, 2);
+
+            //Set Everything
+            player.setLevel(level);
+            player.setExp(experience);
+        }
+    }
+
+    private float round(float d, int decimalPlace) {
+        BigDecimal bd = new BigDecimal(Float.toString(d));
+        bd = bd.setScale(decimalPlace, RoundingMode.HALF_DOWN);
+        return bd.floatValue();
+    }
+}