HSV color To Rgb color - CSharp System.Drawing

CSharp examples for System.Drawing:Color RGB

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Description

HSV color To Rgb color

Demo Code


using System.Drawing.Imaging;
using System.Drawing;
using System.Text;
using System.Collections.Generic;
using System;//from ww w  . j av  a  2  s.  com

public class Main{
        static public Color ToRgb(int Hue, int Saturation, int Value)
        {
            // HsvColor contains values scaled as in the color wheel:

            double h;
            double s;
            double v;

            double r = 0;
            double g = 0;
            double b = 0;

            // Scale Hue to be between 0 and 360. Saturation
            // and value scale to be between 0 and 1.
            h = (double)Hue % 360;
            s = (double)Saturation / 100;
            v = (double)Value / 100;

            if (s == 0)
            {
                // If s is 0, all colors are the same.
                // This is some flavor of gray.
                r = v;
                g = v;
                b = v;
            }
            else
            {
                double p;
                double q;
                double t;

                double fractionalSector;
                int sectorNumber;
                double sectorPos;

                // The color wheel consists of 6 sectors.
                // Figure out which sector you're in.
                sectorPos = h / 60;
                sectorNumber = (int)(Math.Floor(sectorPos));

                // get the fractional part of the sector.
                // That is, how many degrees into the sector
                // are you?
                fractionalSector = sectorPos - sectorNumber;

                // Calculate values for the three axes
                // of the color. 
                p = v * (1 - s);
                q = v * (1 - (s * fractionalSector));
                t = v * (1 - (s * (1 - fractionalSector)));

                // Assign the fractional colors to r, g, and b
                // based on the sector the angle is in.
                switch (sectorNumber)
                {
                    case 0:
                        r = v;
                        g = t;
                        b = p;
                        break;

                    case 1:
                        r = q;
                        g = v;
                        b = p;
                        break;

                    case 2:
                        r = p;
                        g = v;
                        b = t;
                        break;

                    case 3:
                        r = p;
                        g = q;
                        b = v;
                        break;

                    case 4:
                        r = t;
                        g = p;
                        b = v;
                        break;

                    case 5:
                        r = v;
                        g = p;
                        b = q;
                        break;
                }
            }
            // return an RgbColor structure, with values scaled
            // to be between 0 and 255.
            return Color.FromArgb((int)(r * 255), (int)(g * 255), (int)(b * 255));
        }
}

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