Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

import android.graphics.Color;

public class Main {
    /**
     *  Convert HSL values to a RGB Color with a default alpha value of 1.
     *  
     *  <li>H (Hue) is specified as degrees in the range 0 - 360.</li>
     *  <li>S (Saturation) is specified as a percentage in the range 0 - 100.</li>
     *  <li>L (Lumanance) is specified as a percentage in the range 0 - 100.</li>
     *
     *  @param hsl an array containing the 3 HSL values
     *  @return color int in rgb value
     */
    public static int hslToColor(int[] hsl) {
        return hslToRGB(hsl[0], hsl[1], hsl[2]);
    }

    /**
     *  Convert HSL values to a RGB Color with a default alpha value of 1.
     *  
     *  <li>H (Hue) is specified as degrees in the range 0 - 360.</li>
     *  <li>S (Saturation) is specified as a percentage in the range 0 - 100.</li>
     *  <li>L (Lumanance) is specified as a percentage in the range 0 - 100.</li>
     *
     *  @param h  Hue
     *  @param s  Saturation
     *  @param l  Lumanance
     *  @return color int in rgb value
     */
    public static int hslToColor(int h, int s, int l) {
        return hslToRGB(h, s, l);
    }

    /**
     *  Convert HSL values to a RGB Color.
     *
     *  @param h Hue is specified as degrees in the range 0 - 360.
     *  @param s Saturation is specified as a percentage in the range 1 - 100.
     *  @param l Lumanance is specified as a percentage in the range 1 - 100.
     */
    private static int hslToRGB(int hInt, int sInt, int lInt) {
        float h, s, l;

        h = (float) hInt;
        s = (float) sInt;
        l = (float) lInt;

        if (s < 0.0f || s > 100.0f) {
            String message = "Color parameter outside of expected range - Saturation";
            throw new IllegalArgumentException(message);
        }

        if (l < 0.0f || l > 100.0f) {
            String message = "Color parameter outside of expected range - Luminance";
            throw new IllegalArgumentException(message);
        }

        //  Formula needs all values between 0 - 1.

        h = h % 360.0f;
        h /= 360f;
        s /= 100f;
        l /= 100f;

        float q = 0;

        if (l < 0.5)
            q = l * (1 + s);
        else
            q = (l + s) - (s * l);

        float p = 2 * l - q;

        int r = (int) (Math.max(0, HUEtoRGB(p, q, h + (1.0f / 3.0f))) * 255);
        int g = (int) (Math.max(0, HUEtoRGB(p, q, h)) * 255);
        int b = (int) (Math.max(0, HUEtoRGB(p, q, h - (1.0f / 3.0f))) * 255);

        return Color.rgb(r, g, b);
    }

    private static float HUEtoRGB(float p, float q, float h) {
        if (h < 0)
            h += 1;

        if (h > 1)
            h -= 1;

        if (6 * h < 1) {
            return p + ((q - p) * 6 * h);
        }

        if (2 * h < 1) {
            return q;
        }

        if (3 * h < 2) {
            return p + ((q - p) * 6 * ((2.0f / 3.0f) - h));
        }

        return p;
    }
}