Java HSV Color to HSB hsva(double hue, double saturation, double value, double alpha)

Description

hsva

License

Open Source License

Declaration

static double hsva(double hue, double saturation, double value, double alpha) 

Method Source Code

//package com.java2s;
/**/*from  w w  w .j  av  a2  s  . c o m*/
 * MIT License (MIT)
 *
 * Copyright (c) 2014 Volker Berlin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * UT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @author Volker Berlin
 * @license: The MIT license <http://opensource.org/licenses/MIT>
 */

public class Main {
    private static final int[][] HSVA_PERM = { { 0, 3, 1 }, //
            { 2, 0, 1 }, //
            { 1, 0, 3 }, //
            { 1, 2, 0 }, //
            { 3, 1, 0 }, //
            { 0, 1, 2 } };

    static double hsva(double hue, double saturation, double value, double alpha) {
        hue = ((hue % 360) / 360) * 360;

        int i = (int) Math.floor((hue / 60) % 6);
        double f = (hue / 60) - i;

        double[] vs = { value, value * (1 - saturation), value * (1 - f * saturation),
                value * (1 - (1 - f) * saturation) };

        return rgba(vs[HSVA_PERM[i][0]] * 255, vs[HSVA_PERM[i][1]] * 255, vs[HSVA_PERM[i][2]] * 255, alpha);
    }

    static double rgba(double r, double g, double b, double a) {
        return Double.longBitsToDouble(Math.round(a * 0xFFFF) << 48 | (colorLargeDigit(r) << 32)
                | (colorLargeDigit(g) << 16) | colorLargeDigit(b));
    }

    static double rgba(int r, int g, int b, double a) {
        return Double.longBitsToDouble(Math.round(a * 0xFFFF) << 48 | (colorLargeDigit(r) << 32)
                | (colorLargeDigit(g) << 16) | colorLargeDigit(b));
    }

    private static long colorLargeDigit(double value) {
        value *= 0x100;
        if (value >= 0xFFFF) {
            return 0xFFFF;
        } else if (value <= 0) {
            return 0;
        } else {
            return Math.round(value);
        }
    }
}

Related

1. hsv2rgb(float h, float s, float v)
2. hsv2rgb(float h, float s, float v, float[] rgb)
3. hsv2rgb_hex(float h, float s, float v)
4. HSVToColor(float[] hsv)
5. hsvToRgb(double hue, double saturation, double value)
6. HSVtoRGB(double hue, double saturation, double value)
7. hsvToRgb(double[] hsv)