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ColorHSLR.cs
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ColorHSLR.cs
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#region Copyright & License Information
/*
* Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
* This file is part of OpenRA, which is free software. It is made
* available to you under the terms of the GNU General Public License
* as published by the Free Software Foundation. For more information,
* see COPYING.
*/
#endregion
using System.Drawing;
namespace OpenRA.FileFormats
{
public struct ColorRamp
{
public byte H,S,L,R;
public ColorRamp(byte h, byte s, byte l, byte r)
{
H = h; S = s; L = l; R = r;
}
/* returns a color along the Lum ramp */
public Color GetColor( float t )
{
return ColorFromHSL( H / 255f, S / 255f, float2.Lerp( L / 255f, L*R / (255f * 255f), t ) );
}
public override string ToString()
{
return "{0},{1},{2},{3}".F(H, S, L, R);
}
// hk is hue in the range [0,1] instead of [0,360]
public static Color ColorFromHSL(float hk, float s, float l)
{
// Convert from HSL to RGB
var q = (l < 0.5f) ? l * (1 + s) : l + s - (l * s);
var p = 2 * l - q;
float[] trgb = { hk + 1 / 3.0f,
hk,
hk - 1/3.0f };
float[] rgb = { 0, 0, 0 };
for (int k = 0; k < 3; k++)
{
while (trgb[k] < 0) trgb[k] += 1.0f;
while (trgb[k] > 1) trgb[k] -= 1.0f;
}
for (int k = 0; k < 3; k++)
{
if (trgb[k] < 1 / 6.0f) { rgb[k] = (p + ((q - p) * 6 * trgb[k])); }
else if (trgb[k] >= 1 / 6.0f && trgb[k] < 0.5) { rgb[k] = q; }
else if (trgb[k] >= 0.5f && trgb[k] < 2.0f / 3) { rgb[k] = (p + ((q - p) * 6 * (2.0f / 3 - trgb[k]))); }
else { rgb[k] = p; }
}
return Color.FromArgb((int)(rgb[0] * 255), (int)(rgb[1] * 255), (int)(rgb[2] * 255));
}
}
}