hex To Color - Java 2D Graphics

Java examples for 2D Graphics:Color HEX

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Description

hex To Color

Demo Code


//package com.java2s;
import java.awt.Color;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    public static void main(String[] argv) throws Exception {
        String input = "java2s.com";
        System.out.println(hexToColor(input));
    }//from   www.  j  av a2  s.com

    private static final Pattern pattern = Pattern.compile("[a-fA-F0-9]+");

    public static Color hexToColor(String input) {
        String hex = input;
        if (hex.startsWith("#")) {
            hex = hex.substring(1);
        }
        Matcher matcher = pattern.matcher(hex);
        if (matcher.matches()) {

            if (hex.length() == 1) {
                int value = Integer.parseInt(hex, 16);
                value += value * 16;
                return new Color(value, value, value);
            } else if (hex.length() == 2) {
                int value = Integer.parseInt(hex, 16);
                return new Color(value, value, value);
            } else if (hex.length() == 3) {
                int r = Integer.parseInt(hex.substring(0, 1), 16);
                int g = Integer.parseInt(hex.substring(1, 2), 16);
                int b = Integer.parseInt(hex.substring(2, 3), 16);
                r += r * 16;
                g += g * 16;
                b += b * 16;
                return new Color(r, g, b);
            } else if (hex.length() == 4) {
                int a = Integer.parseInt(hex.substring(0, 1), 16);
                int r = Integer.parseInt(hex.substring(1, 2), 16);
                int g = Integer.parseInt(hex.substring(2, 3), 16);
                int b = Integer.parseInt(hex.substring(3, 4), 16);
                a += a * 16;
                r += r * 16;
                g += g * 16;
                b += b * 16;
                return new Color(r, g, b, a);
            } else if (hex.length() == 6) {
                int r = Integer.parseInt(hex.substring(0, 2), 16);
                int g = Integer.parseInt(hex.substring(2, 4), 16);
                int b = Integer.parseInt(hex.substring(4, 6), 16);
                return new Color(r, g, b);
            } else if (hex.length() == 8) {
                int a = Integer.parseInt(hex.substring(0, 2), 16);
                int r = Integer.parseInt(hex.substring(2, 4), 16);
                int g = Integer.parseInt(hex.substring(4, 6), 16);
                int b = Integer.parseInt(hex.substring(6, 8), 16);
                return new Color(r, g, b, a);
            }
        }
        throw new NumberFormatException(String.format(
                "%s is not a valid color string", input));
    }
}

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