Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2015 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Convert RGB components to HSL (hue-saturation-lightness).
     * <ul>
     * <li>hsl[0] is Hue [0 .. 360)</li>
     * <li>hsl[1] is Saturation [0...1]</li>
     * <li>hsl[2] is Lightness [0...1]</li>
     * </ul>
     *
     * @param r   red component value [0..255]
     * @param g   green component value [0..255]
     * @param b   blue component value [0..255]
     * @param hsl 3 element array which holds the resulting HSL components.
     */
    public static void RGBToHSL(int r, int g, int b, float[] hsl) {
        final float rf = r / 255f;
        final float gf = g / 255f;
        final float bf = b / 255f;

        final float max = Math.max(rf, Math.max(gf, bf));
        final float min = Math.min(rf, Math.min(gf, bf));
        final float deltaMaxMin = max - min;

        float h, s;
        float l = (max + min) / 2f;

        if (max == min) {
            // Monochromatic
            h = s = 0f;
        } else {
            if (max == rf) {
                h = ((gf - bf) / deltaMaxMin) % 6f;
            } else if (max == gf) {
                h = ((bf - rf) / deltaMaxMin) + 2f;
            } else {
                h = ((rf - gf) / deltaMaxMin) + 4f;
            }

            s = deltaMaxMin / (1f - Math.abs(2f * l - 1f));
        }

        hsl[0] = (h * 60f) % 360f;
        hsl[1] = s;
        hsl[2] = l;
    }
}