Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 *   ownCloud Android client application
 *
 *   @author David A. Velasco
 *   Copyright (C) 2015 ownCloud Inc.
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License version 2,
 *   as published by the Free Software Foundation.
 *
 *   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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

public class Main {
    /**
     *  Convert HSL values to a RGB Color.
     *
     *  @param h Hue is specified as degrees in the range 0 - 360.
     *  @param s Saturation is specified as a percentage in the range 1 - 100.
     *  @param l Lumanance is specified as a percentage in the range 1 - 100.
     *  @paran alpha  the alpha value between 0 - 1
     *  adapted from https://svn.codehaus.org/griffon/builders/gfxbuilder/tags/GFXBUILDER_0.2/
     *  gfxbuilder-core/src/main/com/camick/awt/HSLColor.java
     */
    @SuppressWarnings("PMD.MethodNamingConventions")
    public static int[] HSLtoRGB(float h, float s, float l, float alpha) {
        if (s < 0.0f || s > 100.0f) {
            String message = "Color parameter outside of expected range - Saturation";
            throw new IllegalArgumentException(message);
        }

        if (l < 0.0f || l > 100.0f) {
            String message = "Color parameter outside of expected range - Luminance";
            throw new IllegalArgumentException(message);
        }

        if (alpha < 0.0f || alpha > 1.0f) {
            String message = "Color parameter outside of expected range - Alpha";
            throw new IllegalArgumentException(message);
        }

        //  Formula needs all values between 0 - 1.

        h = h % 360.0f;
        h /= 360f;
        s /= 100f;
        l /= 100f;

        float q = 0;

        if (l < 0.5) {
            q = l * (1 + s);
        } else {
            q = (l + s) - (s * l);
        }

        float p = 2 * l - q;

        int r = Math.round(Math.max(0, HueToRGB(p, q, h + (1.0f / 3.0f)) * 256));
        int g = Math.round(Math.max(0, HueToRGB(p, q, h) * 256));
        int b = Math.round(Math.max(0, HueToRGB(p, q, h - (1.0f / 3.0f)) * 256));

        return new int[] { r, g, b };
    }

    @SuppressWarnings("PMD.MethodNamingConventions")
    private static float HueToRGB(float p, float q, float h) {
        if (h < 0) {
            h += 1;
        }

        if (h > 1) {
            h -= 1;
        }

        if (6 * h < 1) {
            return p + ((q - p) * 6 * h);
        }

        if (2 * h < 1) {
            return q;
        }

        if (3 * h < 2) {
            return p + ((q - p) * 6 * ((2.0f / 3.0f) - h));
        }

        return p;
    }
}