HSL stands for hue, saturation, and lightness, and is a cylindrical representation of RGB values. - Java 2D Graphics

Java examples for 2D Graphics:Color RGB

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Description

HSL stands for hue, saturation, and lightness, and is a cylindrical representation of RGB values.

Demo Code

/**/*from  w w  w .  jav 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;

    /**
     * HSL stands for hue, saturation, and lightness, and is a cylindrical representation
     * of RGB values.
     * @param h [0?;360?]
     * @param s [0;1]
     * @param l [0;1]
     * @return
     */
    public static Color getColorFromHSL(double h, double s, double l) {
        float chroma = (float) ((1 - Math.abs(2 * l - 1)) * s);

        final double h2 = h / INTERVAL_SIZE;
        final float x = (float) (chroma * (1 - Math.abs((h2 % 2) - 1)));
        float r = 0f, g = 0f, b = 0f;

        if (h2 < 1.0) {
            r = chroma;
            g = x;
            b = 0f;
        } else if (h2 < 2.0) {
            r = x;
            g = chroma;
            b = 0f;
        } else if (h2 < 3.0) {
            r = 0;
            g = chroma;
            b = x;
        } else if (h2 < 4.0) {
            r = 0;
            g = x;
            b = chroma;
        } else if (h2 < 5.0) {
            r = x;
            g = 0f;
            b = chroma;
        } else if (h2 < 6.0) {
            r = chroma;
            g = 0f;
            b = x;
        }

        float m = (float) (l - 0.5 * chroma);

        float rm = r + m;
        float gm = g + m;
        float bm = b + m;

        if (rm < 0.0) {
            rm = 0f;
        }
        if (gm < 0.0) {
            gm = 0f;
        }
        if (bm < 0.0) {
            bm = 0f;
        }

        return new Color(rm, gm, bm);
    }
}

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