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Code Issues Releases Wiki Activity

Added helper-methods for HSV<-->RGB conversion

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Darth Affe 2015-09-27 16:46:19 +02:00
parent 6d61716567
commit 2d44419fb7
1 changed files with 75 additions and 16 deletions
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91
Helper/ColorHelper.cs
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@ -7,6 +7,8 @@ namespace CUE.NET.Helper
{
public static class ColorHelper
{
#region byte/float conversion
public static float GetFloatA(this Color color)
{
return color.A / 255f;
@ -27,21 +29,6 @@ namespace CUE.NET.Helper
return color.B / 255f;
}
public static Color Blend(this Color bg, Color fg)
{
if (fg.A == 255)
return fg;
if (fg.A == 0)
return bg;
float resultA = (1 - (1 - fg.GetFloatA()) * (1 - bg.GetFloatA()));
float resultR = (fg.GetFloatR() * fg.GetFloatA() / resultA + bg.GetFloatR() * bg.GetFloatA() * (1 - fg.GetFloatA()) / resultA);
float resultG = (fg.GetFloatG() * fg.GetFloatA() / resultA + bg.GetFloatG() * bg.GetFloatA() * (1 - fg.GetFloatA()) / resultA);
float resultB = (fg.GetFloatB() * fg.GetFloatA() / resultA + bg.GetFloatB() * bg.GetFloatA() * (1 - fg.GetFloatA()) / resultA);
return CreateColorFromFloat(resultA, resultR, resultG, resultB);
}
public static Color CreateColorFromFloat(float a, float r, float g, float b)
{
return Color.FromArgb(GetIntColorFromFloat(a), GetIntColorFromFloat(r), GetIntColorFromFloat(g), GetIntColorFromFloat(b));
@ -50,7 +37,79 @@ namespace CUE.NET.Helper
private static byte GetIntColorFromFloat(float f)
{
float calcF = (float)Math.Max(0f, Math.Min(1f, f));
return (byte)(calcF.Equals(1f) ? 255 : calcF * 256.0);
return (byte)(calcF.Equals(1f) ? 255 : calcF * 256f);
}
#endregion
#region Blending
public static Color Blend(this Color bg, Color fg)
{
if (fg.A == 255)
return fg;
if (fg.A == 0)
return bg;
float resultA = (1f - (1f - fg.GetFloatA()) * (1f - bg.GetFloatA()));
float resultR = (fg.GetFloatR() * fg.GetFloatA() / resultA + bg.GetFloatR() * bg.GetFloatA() * (1f - fg.GetFloatA()) / resultA);
float resultG = (fg.GetFloatG() * fg.GetFloatA() / resultA + bg.GetFloatG() * bg.GetFloatA() * (1f - fg.GetFloatA()) / resultA);
float resultB = (fg.GetFloatB() * fg.GetFloatA() / resultA + bg.GetFloatB() * bg.GetFloatA() * (1f - fg.GetFloatA()) / resultA);
return CreateColorFromFloat(resultA, resultR, resultG, resultB);
}
#endregion
#region RGB/HSV conversion
// https://en.wikipedia.org/wiki/HSL_and_HSV
public static float GetSaturation(this Color color)
{
int max = Math.Max(color.R, Math.Max(color.G, color.B));
int min = Math.Min(color.R, Math.Min(color.G, color.B));
return (max == 0) ? 0 : 1f - ((float)min / (float)max);
}
public static float GetValue(this Color color)
{
return Math.Max(color.R, Math.Max(color.G, color.B)) / 255f;
}
// Based on http://stackoverflow.com/questions/3018313/algorithm-to-convert-rgb-to-hsv-and-hsv-to-rgb-in-range-0-255-for-both/6930407#6930407 as of 27.09.2015
public static Color ColorFromHSV(float hue, float saturation, float value, byte alpha = 255)
{
if (saturation <= 0.0)
{
int val = GetIntColorFromFloat(value);
return Color.FromArgb(alpha, val, val, val);
}
float hh = (hue % 360f) / 60f;
int i = (int)hh;
float ff = hh - i;
float p = value * (1f - saturation);
float q = value * (1f - (saturation * ff));
float t = value * (1f - (saturation * (1f - ff)));
switch (i)
{
case 0:
return Color.FromArgb(alpha, GetIntColorFromFloat(value), GetIntColorFromFloat(t), GetIntColorFromFloat(p));
case 1:
return Color.FromArgb(alpha, GetIntColorFromFloat(q), GetIntColorFromFloat(value), GetIntColorFromFloat(p));
case 2:
return Color.FromArgb(alpha, GetIntColorFromFloat(p), GetIntColorFromFloat(value), GetIntColorFromFloat(t));
case 3:
return Color.FromArgb(alpha, GetIntColorFromFloat(p), GetIntColorFromFloat(q), GetIntColorFromFloat(value));
case 4:
return Color.FromArgb(alpha, GetIntColorFromFloat(t), GetIntColorFromFloat(p), GetIntColorFromFloat(value));
default:
return Color.FromArgb(alpha, GetIntColorFromFloat(value), GetIntColorFromFloat(p), GetIntColorFromFloat(q));
}
}
#endregion
}
}