Create Color From HLS value
using System;
using System.Drawing;
namespace SharpNeatLib.NetworkVisualization
{
public class ColorUtilities
{
const float oneThird = 1F/3F;
const float twoThirds = 2F/3F;
/// <summary>
/// HSL values = From 0 to 1
/// </summary>
/// <param name="H"></param>
/// <param name="S"></param>
/// <param name="L"></param>
/// <returns></returns>
public static Color FromHls(float H, float S, float L)
{
int R, G, B;
if ( S == 0 )
{
R = (int)(L * 255F); //RGB results = From 0 to 255
G = (int)(L * 255F);
B = (int)(L * 255F);
}
else
{
float var_1, var_2;
if (L<0.5F)
var_2 = L * (1F + S);
else
var_2 = (L + S) - (S * L);
var_1 = 2F * L - var_2;
R = (int)(255F * Hue_2_RGB(var_1, var_2, H + oneThird));
G = (int)(255F * Hue_2_RGB(var_1, var_2, H));
B = (int)(255F * Hue_2_RGB(var_1, var_2, H - oneThird));
}
return Color.FromArgb(R,G,B);
}
private static float Hue_2_RGB(float v1, float v2, float vH)
{
if (vH < 0F) vH += 1F;
if (vH > 1F) vH -= 1F;
if ( (6F * vH) < 1F ) return v1 + (v2-v1) * 6F * vH;
if ( (2F * vH) < 1F ) return v2;
if ( (3F * vH) < 2F ) return v1 + (v2-v1) * (twoThirds - vH) * 6F;
return v1;
}
/// <summary>
/// Blue-Red scale (blue to red).
/// </summary>
/// <param name="temp">0.0=blue, 1.0=red</param>
/// <returns></returns>
public static Color FromBlueRedScale(float temp)
{
// Trim invalid values.
temp=(float)Math.Max(0.0, temp);
temp=(float)Math.Min(1.0, temp);
int red=(int)(temp*255F);
int blue=(int)((1.0-temp)*255F);
return Color.FromArgb(red, 0, blue);
}
}
}
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