Java HSL Color Convert hslToRGB(int h, float s, float l)

Description

hsl To RGB

License

Open Source License

Declaration

public static float[] hslToRGB(int h, float s, float l) 

Method Source Code

//package com.java2s;
/*!/*ww  w  .j  a v a2s. com*/
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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 Lesser General Public License for more details.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

public class Main {
    private static final float ONE_THIRD = 1f / 3f;

    public static float[] hslToRGB(int h, float s, float l) {
        final int hue = normalizeHue(h);

        float saturation = s;
        if (saturation > 100) {
            saturation = 100;
        }
        if (saturation < 0) {
            saturation = 0;
        }
        float lightness = l;
        if (lightness > 100) {
            lightness = 100;
        }
        if (lightness < 0) {
            lightness = 0;
        }
        float m2;
        if (lightness <= 0.5) {
            m2 = lightness * (saturation + 1);
        } else {
            m2 = lightness + saturation - lightness * saturation;
        }
        float m1 = lightness * 2 - m2;

        float r = hueToRGB(m1, m2, hue + ONE_THIRD);
        float g = hueToRGB(m1, m2, hue);
        float b = hueToRGB(m1, m2, hue - ONE_THIRD);
        return new float[] { r, g, b };

    }

    private static int normalizeHue(final int integerValue) {
        return ((integerValue % 360) + 360) % 360;
    }

    private static float hueToRGB(float m1, float m2, float h) {
        if (h < 0) {
            h = h + 1;
        }
        if (h > 1) {
            h = h - 1;
        }
        if ((h * 6f) < 1) {
            return m1 + (m2 - m1) * h * 6;
        }
        if ((h * 2f) < 1) {
            return m2;
        }
        if ((h * 3f) < 2) {
            return m1 + (m2 - m1) * (2 * ONE_THIRD - h) * 6;
        }
        return m1;
    }
}

Related

1. HSLtoRGB(float h, float s, float l)
2. HslToRgb(float h, float s, float l, float a)
3. HSLtoRGB(float hue, float sat, float lum)
4. hslToRgb(float[] hsl)
5. HSLtoRGB(float[] hsl)
6. hueFromColor(Color c)