Extract the hue component (HSL color space) from a RGB color - Java 2D Graphics

Java examples for 2D Graphics:Color RGB

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Description

Extract the hue component (HSL color space) from a RGB color

Demo Code

/**/*w w  w .j  av  a 2 s . c om*/
 * OrbisGIS is a java GIS application dedicated to research in GIScience.
 * OrbisGIS is developed by the GIS group of the DECIDE team of the 
 * Lab-STICC CNRS laboratory, see <http://www.lab-sticc.fr/>.
 *
 * The GIS group of the DECIDE team is located at :
 *
 * Laboratoire Lab-STICC ? CNRS UMR 6285
 * Equipe DECIDE
 * UNIVERSIT? DE BRETAGNE-SUD
 * Institut Universitaire de Technologie de Vannes
 * 8, Rue Montaigne - BP 561 56017 Vannes Cedex
 * 
 * OrbisGIS is distributed under GPL 3 license.
 *
 * Copyright (C) 2007-2014 CNRS (IRSTV FR CNRS 2488)
 * Copyright (C) 2015-2016 CNRS (Lab-STICC UMR CNRS 6285)
 *
 * This file is part of OrbisGIS.
 *
 * OrbisGIS is free software: you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * OrbisGIS is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * OrbisGIS. If not, see <http://www.gnu.org/licenses/>.
 *
 * For more information, please consult: <http://www.orbisgis.org/>
 * or contact directly:
 * info_at_ orbisgis.org
 */
//package com.java2s;
import java.awt.Color;

public class Main {
    private static final float INTERVAL_SIZE = 60.0f;
    private static final float DEGREES = 360.0f;

    /**
     * Extract the hue component (HSL color space) from a RGB color
     * @param color  the color the extract the hue from
     * @return hue [0;360]
     */
    public static float getHue(Color color) {
        int r = color.getRed();
        int g = color.getGreen();
        int b = color.getBlue();

        int max = Math.max(r, Math.max(g, b));
        int min = Math.min(r, Math.min(g, b));

        if (max == min) {
            return 0f;
        } else if (max == r) {
            return (INTERVAL_SIZE * (g - b) / (max - min) + (int) DEGREES)
                    % (int) DEGREES;
        } else if (max == g) {
            return INTERVAL_SIZE * (b - r) / (max - min) + 120;
        } else { // max == b
            return INTERVAL_SIZE * (r - g) / (max - min) + 240;
        }
    }
}

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