    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 CIELUV color space..
    021 *
    022 * <p>Contains the constant values for black, white, red,
    023 * green, and blue.</p>
    024 *
    025 * @see <a href="https://en.wikipedia.org/wiki/CIELUV">https://en.wikipedia.org/wiki/CIELUV</a>
    026 * @since 1.0-alpha1
    027 */
    028public final class ColorCieLuv {
    029
    030    /**
    031     * A constant for color black. Color components are:
    032     * <pre>
    033     *     L: 0.000
    034     *     u: 0.000
    035     *     v: 0.000
    036     * </pre>
    037     */
    038    public static final ColorCieLuv BLACK = new ColorCieLuv(0, 0, 0);
    039
    040    /**
    041     * A constant for color white. Color components are:
    042     * <pre>
    043     *     L: 100.000
    044     *     u:   0.000
    045     *     v:  -0.017
    046     * </pre>
    047     */
    048    public static final ColorCieLuv WHITE = new ColorCieLuv(100, 0, -0.017);
    049
    050    /**
    051     * A constant for color red. Color components are:
    052     * <pre>
    053     *     L:  53.233
    054     *     u: 175.053
    055     *     v:  37.751
    056     * </pre>
    057     */
    058    public static final ColorCieLuv RED = new ColorCieLuv(53.233, 175.053, 37.751);
    059
    060    /**
    061     * A constant for color green. Color components are:
    062     * <pre>
    063     *     L:  87.737
    064     *     u: -83.080
    065     *     v: 107.401
    066     * </pre>
    067     */
    068    public static final ColorCieLuv GREEN = new ColorCieLuv(87.737, -83.080, 107.401);
    069
    070    /**
    071     * A constant for color blue. Color components are:
    072     * <pre>
    073     *     L:   32.303
    074     *     u:   -9.400
    075     *     v: -130.358
    076     * </pre>
    077     */
    078    public static final ColorCieLuv BLUE = new ColorCieLuv(32.303, -9.400, -130.358);
    079
    080    public final double L;
    081    public final double u;
    082    public final double v;
    083
    084    public ColorCieLuv(final double L, final double u, final double v) {
    085        this.L = L;
    086        this.u = u;
    087        this.v = v;
    088    }
    089
    090    @Override
    091    public String toString() {
    092        return "{L: " + L + ", u: " + u + ", v: " + v + "}";
    093    }
    094
    095    @Override
    096    public boolean equals(final Object o) {
    097        if (this == o) {
    098            return true;
    099        }
    100        if (o == null || getClass() != o.getClass()) {
    101            return false;
    102        }
    103
    104        final ColorCieLuv that = (ColorCieLuv) o;
    105        if (Double.compare(that.L, L) != 0) {
    106            return false;
    107        }
    108        if (Double.compare(that.u, u) != 0) {
    109            return false;
    110        }
    111        if (Double.compare(that.v, v) != 0) {
    112            return false;
    113        }
    114
    115        return true;
    116    }
    117
    118    @Override
    119    public int hashCode() {
    120        int result;
    121        long temp;
    122        temp = Double.doubleToLongBits(L);
    123        result = (int) (temp ^ (temp >>> 32));
    124        temp = Double.doubleToLongBits(u);
    125        result = 31 * result + (int) (temp ^ (temp >>> 32));
    126        temp = Double.doubleToLongBits(v);
    127        result = 31 * result + (int) (temp ^ (temp >>> 32));
    128        return result;
    129    }
    130}