Java List Average getAverageColour(List colours)

Description

get Average Colour

License

Open Source License

Declaration

public static int getAverageColour(List<Integer> colours) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.List;

public class Main {
    public static int getAverageColour(List<Integer> colours) {
        int r = 0;
        int g = 0;
        int b = 0;
        int a = 0;
        int col;// w w  w.ja  va 2 s  . c  o m

        int count = colours.size();

        for (int i = 0; i < count; i++) {
            col = colours.get(i);
            r += red(col);
            g += green(col);
            b += blue(col);
            a += alpha(col);
        }

        return compose(r / count, g / count, b / count, a / count);
    }

    public static int red(int c) {
        return (c >> 16) & 0xFF;
    }

    public static int green(int c) {
        return (c >> 8) & 0xFF;
    }

    public static int blue(int c) {
        return (c) & 0xFF;
    }

    public static int alpha(int c) {
        return (c >> 24) & 0xFF;
    }

    public static int compose(int r, int g, int b, int a) {
        int rgb = a;
        rgb = (rgb << 8) + r;
        rgb = (rgb << 8) + g;
        rgb = (rgb << 8) + b;
        return rgb;
    }

    public static int compose(int[] col) {
        int r = col[0];
        int g = col[1];
        int b = col[2];
        int a = col.length > 3 ? col[3] : 255;
        return compose(r, g, b, a);
    }
}

Related

1. getAverage(List l)
2. getAverage(List values)
3. getAverage(List values)
4. getAverage(List values)
5. getAverage(List numbers)
6. getAverageDuration(List durations)
7. getAverageInterval(List tapTimestamps, int n)
8. getStandardDeviation(List longList, long average, long devByZero)