ColorUtil.java

package com.demigodsrpg.util;

import com.google.common.collect.ImmutableBiMap;
import com.google.common.collect.Maps;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.material.MaterialData;

import java.awt.*;
import java.util.Map;

public class ColorUtil {
    /**
     * Linking ChatColor objects to the corresponding Color.
     */
    public static final ImmutableBiMap<ChatColor, Color> CHAT_COLOR;

    static {
        Map<ChatColor, Color> chatColorColor = Maps.newHashMap();
        chatColorColor.put(ChatColor.BLACK, new Color(0, 0, 0));
        chatColorColor.put(ChatColor.DARK_BLUE, new Color(0, 0, 170));
        chatColorColor.put(ChatColor.DARK_GREEN, new Color(0, 170, 0));
        chatColorColor.put(ChatColor.DARK_AQUA, new Color(0, 170, 170));
        chatColorColor.put(ChatColor.DARK_RED, new Color(170, 0, 0));
        chatColorColor.put(ChatColor.DARK_PURPLE, new Color(170, 0, 170));
        chatColorColor.put(ChatColor.GOLD, new Color(255, 170, 0));
        chatColorColor.put(ChatColor.GRAY, new Color(170, 170, 170));
        chatColorColor.put(ChatColor.DARK_GRAY, new Color(85, 85, 85));
        chatColorColor.put(ChatColor.BLUE, new Color(85, 85, 255));
        chatColorColor.put(ChatColor.GREEN, new Color(85, 255, 85));
        chatColorColor.put(ChatColor.AQUA, new Color(85, 255, 255));
        chatColorColor.put(ChatColor.RED, new Color(255, 85, 85));
        chatColorColor.put(ChatColor.LIGHT_PURPLE, new Color(255, 85, 255));
        chatColorColor.put(ChatColor.YELLOW, new Color(255, 255, 85));
        chatColorColor.put(ChatColor.WHITE, new Color(255, 255, 255));
        CHAT_COLOR = ImmutableBiMap.copyOf(chatColorColor);
    }

    /**
     * Linking block materials to their corresponding Color.
     */
    public static ImmutableBiMap<MaterialData, Color> BLOCK_COLOR;

    static {
        Map<MaterialData, Color> blockColor = Maps.newHashMap();

        // WOOL
        blockColor.put(new MaterialData(Material.WOOL, (byte) 0), new Color(238, 238, 238));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 1), new Color(213, 116, 50));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 2), new Color(168, 65, 177));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 3), new Color(113, 141, 201));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 4), new Color(193, 181, 45));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 5), new Color(66, 171, 55));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 6), new Color(203, 125, 146));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 7), new Color(72, 72, 72));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 8), new Color(127, 135, 135));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 9), new Color(39, 94, 117));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 10), new Color(120, 55, 173));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 11), new Color(39, 45, 116));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 12), new Color(74, 46, 29));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 13), new Color(36, 48, 19));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 14), new Color(153, 35, 38));
        blockColor.put(new MaterialData(Material.WOOL, (byte) 15), new Color(25, 25, 25));

        // HARD CLAY
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 0), new Color(221, 176, 152));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 1), new Color(185, 82, 36));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 2), new Color(163, 83, 98));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 3), new Color(121, 106, 129));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 4), new Color(206, 132, 35));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 5), new Color(102, 115, 58));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 6), new Color(179, 75, 73));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 7), new Color(64, 44, 39));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 8), new Color(141, 102, 88));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 9), new Color(80, 86, 82));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 10), new Color(124, 67, 79));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 11), new Color(77, 63, 86));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 12), new Color(83, 55, 39));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 13), new Color(73, 82, 46));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 14), new Color(166, 61, 46));
        blockColor.put(new MaterialData(Material.HARD_CLAY, (byte) 15), new Color(44, 32, 19));

        // SAND
        blockColor.put(new MaterialData(Material.SAND, (byte) 0), new Color(247, 233, 163));
        blockColor.put(new MaterialData(Material.SANDSTONE, (byte) 0), new Color(213, 201, 140));

        // STONE
        blockColor.put(new MaterialData(Material.STONE, (byte) 0), new Color(144, 144, 144));
        blockColor.put(new MaterialData(Material.SMOOTH_BRICK, (byte) 0), new Color(117, 117, 117));

        // REDSTONE
        blockColor.put(new MaterialData(Material.REDSTONE_BLOCK, (byte) 0), new Color(255, 0, 0));

        // ICE
        blockColor.put(new MaterialData(Material.PACKED_ICE, (byte) 0), new Color(160, 160, 255));
        blockColor.put(new MaterialData(Material.ICE, (byte) 0), new Color(138, 138, 220));

        // DIRT
        blockColor.put(new MaterialData(Material.DIRT, (byte) 0), new Color(73, 58, 35));

        // NETHER
        blockColor.put(new MaterialData(Material.NETHER_BRICK, (byte) 0), new Color(112, 2, 0));

        // OBSIDIAN
        blockColor.put(new MaterialData(Material.OBSIDIAN, (byte) 0), new Color(21, 20, 31));

        // COAL
        blockColor.put(new MaterialData(Material.COAL_BLOCK, (byte) 0), new Color(12, 12, 12));

        // EMERALD
        blockColor.put(new MaterialData(Material.EMERALD_BLOCK, (byte) 0), new Color(0, 217, 58));

        BLOCK_COLOR = ImmutableBiMap.copyOf(blockColor);
    }

    /**
     * Color distance formula.
     *
     * @param c1 Color one.
     * @param c2 Color two.
     * @return The 'distance' between the two colors.
     */
    public static double getColorDistance(Color c1, Color c2) {
        double rmean = (c1.getRed() + c2.getRed()) / 2;
        int r = c1.getRed() - c2.getRed();
        int g = c1.getGreen() - c2.getGreen();
        int b = c1.getBlue() - c2.getBlue();
        double weightR = 2 + rmean / 256;
        double weightG = 4.0;
        double weightB = 2 + (255 - rmean) / 256;
        return Math.sqrt(weightR * r * r + weightG * g * g + weightB * b * b);
    }

    /**
     * Get a ChatColor that is best related to a given Color.
     *
     * @param color Color to be matched.
     * @return Best ChatColor found.
     */
    public static ChatColor getChatColor(final Color color) {
        Color nearestColor = Color.WHITE;
        double bestDistance = Double.MAX_VALUE;

        for (Color chatColor : CHAT_COLOR.values()) {
            double distance = getColorDistance(chatColor, color);
            if (distance < bestDistance) {
                nearestColor = chatColor;
                bestDistance = distance;
            }
        }

        return CHAT_COLOR.inverse().get(nearestColor);
    }

    /**
     * Get a Color that is best related to a given ChatColor.
     *
     * @param color ChatColor to be matched.
     * @return Best Color found.
     */
    public static Color getColor(final ChatColor color) {
        return CHAT_COLOR.get(color);
    }

    /**
     * Get MaterialData that is best related to a given ChatColor.
     *
     * @param color ChatColor to be matched.
     * @return Best MaterialData found.
     */
    public static MaterialData getMaterial(final ChatColor color) {
        return getMaterial(Color.WHITE, getColor(color));
    }

    /**
     * Get MaterialData that is best related to a given Color.
     *
     * @param color Color to be matched.
     * @return Best MaterialData found.
     */
    public static MaterialData getMaterial(Color average, final Color color) {
        Color nearestColor = average;
        double bestDistance = Double.MAX_VALUE;

        for (Color theColor : BLOCK_COLOR.values()) {
            double distance = getColorDistance(theColor, color);
            if (distance < bestDistance) {
                nearestColor = theColor;
                bestDistance = distance;
            }
        }

        return BLOCK_COLOR.inverse().get(nearestColor);
    }

    /**
     * Returns a color (red, yellow, green) based on the <code>value</code> and <code>max</code> passed in.
     *
     * @param value the actual value.
     * @param max   the maximum value possible.
     */
    public static ChatColor getColor(double value, double max) {
        ChatColor color = ChatColor.RESET;
        if (value < Math.ceil(0.33 * max)) color = ChatColor.RED;
        else if (value < Math.ceil(0.66 * max) && value > Math.ceil(0.33 * max)) color = ChatColor.YELLOW;
        if (value > Math.ceil(0.66 * max)) color = ChatColor.GREEN;
        return color;
    }
}