    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.imaging.color;
    018
    019/**
    020 * Represents a color in the Hunter Lab color space.
    021 *
    022 * <p>
    023 * Contains the constant values for black, white, red, green, and blue.
    024 * </p>
    025 *
    026 * @see <a href="https://en.wikipedia.org/wiki/CIELAB_color_space#Hunter_Lab">https://en.wikipedia.org/wiki/CIELAB_color_space#Hunter_Lab</a>
    027 * @since 1.0-alpha1
    028 */
    029public final class ColorHunterLab {
    030
    031    /**
    032     * A constant for color black. Color components are:
    033     *
    034     * <pre>
    035     *     L: 0
    036     *     a: 0
    037     *     b: 0
    038     * </pre>
    039     */
    040    public static final ColorHunterLab BLACK = new ColorHunterLab(0, 0, 0);
    041
    042    /**
    043     * A constant for color white. Color components are:
    044     *
    045     * <pre>
    046     *     L: 100.000
    047     *     a:  -5.336
    048     *     b:   5.433
    049     * </pre>
    050     */
    051    public static final ColorHunterLab WHITE = new ColorHunterLab(100, -5.336, 5.433);
    052
    053    /**
    054     * A constant for color red. Color components are:
    055     *
    056     * <pre>
    057     *     L: 46.109
    058     *     a: 78.962
    059     *     b: 29.794
    060     * </pre>
    061     */
    062    public static final ColorHunterLab RED = new ColorHunterLab(46.109, 78.962, 29.794);
    063
    064    /**
    065     * A constant for color green. Color components are:
    066     *
    067     * <pre>
    068     *     L:  84.569
    069     *     a: -72.518
    070     *     b:  50.842
    071     * </pre>
    072     */
    073    public static final ColorHunterLab GREEN = new ColorHunterLab(84.569, -72.518, 50.842);
    074
    075    /**
    076     * A constant for color blue. Color components are:
    077     *
    078     * <pre>
    079     *     L:   26.870
    080     *     a:   72.885
    081     *     b: -190.923
    082     * </pre>
    083     */
    084    public static final ColorHunterLab BLUE = new ColorHunterLab(26.870, 72.885, -190.923);
    085
    086    public final double l;
    087    public final double a;
    088    public final double b;
    089
    090    public ColorHunterLab(final double l, final double a, final double b) {
    091        this.l = l;
    092        this.a = a;
    093        this.b = b;
    094    }
    095
    096    @Override
    097    public boolean equals(final Object o) {
    098        if (this == o) {
    099            return true;
    100        }
    101        if (o == null || getClass() != o.getClass()) {
    102            return false;
    103        }
    104
    105        final ColorHunterLab that = (ColorHunterLab) o;
    106        if (Double.compare(that.l, l) != 0) {
    107            return false;
    108        }
    109        if (Double.compare(that.a, a) != 0) {
    110            return false;
    111        }
    112        if (Double.compare(that.b, b) != 0) {
    113            return false;
    114        }
    115
    116        return true;
    117    }
    118
    119    @Override
    120    public int hashCode() {
    121        int result;
    122        long temp;
    123        temp = Double.doubleToLongBits(l);
    124        result = (int) (temp ^ temp >>> 32);
    125        temp = Double.doubleToLongBits(a);
    126        result = 31 * result + (int) (temp ^ temp >>> 32);
    127        temp = Double.doubleToLongBits(b);
    128        return 31 * result + (int) (temp ^ temp >>> 32);
    129    }
    130
    131    @Override
    132    public String toString() {
    133        return "{L: " + l + ", a: " + a + ", b: " + b + "}";
    134    }
    135}