Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2013 Phil Brown
    
 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.
 */

import android.graphics.Color;

public class Main {
    /**
     * Calculates the <em>brightness</em> of a color, based on its RGB values.
     * @param color the color whose brightness is in question
     * @return a brightness value in the range [0-255].
     * @see <a href="http://www.nbdtech.com/Blog/archive/2008/04/27/Calculating-the-Perceived-Brightness-of-a-Color.aspx">Calculating the Perceived Brightness of a Color</a>
     */
    public static int colorBrightness(int color) {
        int r2 = Color.red(color) * Color.red(color);
        int g2 = Color.green(color) * Color.green(color);
        int b2 = Color.blue(color) * Color.blue(color);

        return (int) Math.sqrt(r2 * 0.241f + g2 * 0.691f + b2 * 0.068f);
    }
}