Create color From Hsv - CSharp System.Drawing

CSharp examples for System.Drawing:Color HSV

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Description

Create color From Hsv

Demo Code


using System.Drawing;
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;/* www  .j a va2s. co m*/

public class Main{
        public static Color FromHsv(double h, double S, double V)
        {
            double H = h;
            while (H < 0) { H += 360; };
            while (H >= 360) { H -= 360; };
            double R, G, B;
            if (V <= 0)
            { R = G = B = 0; }
            else if (S <= 0)
            {
                R = G = B = V;
            }
            else
            {
                double hf = H / 60.0;
                int i = (int)Math.Floor(hf);
                double f = hf - i;
                double pv = V * (1 - S);
                double qv = V * (1 - S * f);
                double tv = V * (1 - S * (1 - f));
                switch (i)
                {

                    // Red is the dominant color

                    case 0:
                        R = V;
                        G = tv;
                        B = pv;
                        break;

                    // Green is the dominant color

                    case 1:
                        R = qv;
                        G = V;
                        B = pv;
                        break;
                    case 2:
                        R = pv;
                        G = V;
                        B = tv;
                        break;

                    // Blue is the dominant color

                    case 3:
                        R = pv;
                        G = qv;
                        B = V;
                        break;
                    case 4:
                        R = tv;
                        G = pv;
                        B = V;
                        break;

                    // Red is the dominant color

                    case 5:
                        R = V;
                        G = pv;
                        B = qv;
                        break;

                    // Just in case we overshoot on our math by a little, we put these here. Since its a switch it won't slow us down at all to put these here.

                    case 6:
                        R = V;
                        G = tv;
                        B = pv;
                        break;
                    case -1:
                        R = V;
                        G = pv;
                        B = qv;
                        break;

                    // The color is not defined, we should throw an error.

                    default:
                        //LFATAL("i Value error in Pixel conversion, Value is %d", i);
                        R = G = B = V; // Just pretend its black/white
                        break;
                }
            }

            return Color.FromArgb(
                Clamp((int)(R * 255.0)),
                Clamp((int)(G * 255.0)),
                Clamp((int)(B * 255.0)));
        }
}

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