Java HSV Color to RGB Color hsvToRgb(float H, float S, float V)

Description

hsv To Rgb

License

Apache License

Declaration

public static String hsvToRgb(float H, float S, float V) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    public static String hsvToRgb(float H, float S, float V) {

        float R, G, B;

        H /= 360f;//from w w  w .  java 2  s .  co m
        S /= 100f;
        V /= 100f;

        if (S == 0) {
            R = V * 255;
            G = V * 255;
            B = V * 255;
        } else {
            float var_h = H * 6;
            if (var_h == 6)
                var_h = 0; // H must be < 1
            int var_i = (int) Math.floor((double) var_h); // Or ... var_i =
                                                          // floor( var_h )
            float var_1 = V * (1 - S);
            float var_2 = V * (1 - S * (var_h - var_i));
            float var_3 = V * (1 - S * (1 - (var_h - var_i)));

            float var_r;
            float var_g;
            float var_b;
            if (var_i == 0) {
                var_r = V;
                var_g = var_3;
                var_b = var_1;
            } else if (var_i == 1) {
                var_r = var_2;
                var_g = V;
                var_b = var_1;
            } else if (var_i == 2) {
                var_r = var_1;
                var_g = V;
                var_b = var_3;
            } else if (var_i == 3) {
                var_r = var_1;
                var_g = var_2;
                var_b = V;
            } else if (var_i == 4) {
                var_r = var_3;
                var_g = var_1;
                var_b = V;
            } else {
                var_r = V;
                var_g = var_1;
                var_b = var_2;
            }

            R = var_r * 255; // RGB results from 0 to 255
            G = var_g * 255;
            B = var_b * 255;
        }

        String rs = Integer.toHexString((int) (R));
        String gs = Integer.toHexString((int) (G));
        String bs = Integer.toHexString((int) (B));

        if (rs.length() == 1)
            rs = "0" + rs;
        if (gs.length() == 1)
            gs = "0" + gs;
        if (bs.length() == 1)
            bs = "0" + bs;
        return "#" + rs + gs + bs;
    }

    public final static String toHexString(java.awt.Color colour) throws NullPointerException {
        String hexColour = Integer.toHexString(colour.getRGB() & 0xffffff);
        if (hexColour.length() < 6) {
            hexColour = "000000".substring(0, 6 - hexColour.length()) + hexColour;
        }
        return "#" + hexColour;
    }
}

Related

1. HSVtoRGB(double[] data)
2. HSVtoRGB(float h, float s, float v)