103 lines
2.7 KiB
C#
103 lines
2.7 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2011 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see COPYING.
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*/
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#endregion
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using System.Drawing;
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namespace OpenRA.FileFormats
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{
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public struct HSLColor
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{
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public readonly byte H;
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public readonly byte S;
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public readonly byte L;
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public readonly Color RGB;
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public static HSLColor FromHSV(float h, float s, float v)
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{
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var ll = 0.5f * (2 - s) * v;
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var ss = (ll >= 1 || v <= 0) ? 0 : 0.5f * s * v / (ll <= 0.5f ? ll : 1 - ll);
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return new HSLColor((byte)(255 * h), (byte)(255 * ss), (byte)(255 * ll));
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}
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public static HSLColor FromRGB(int r, int g, int b)
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{
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var c = Color.FromArgb(r, g, b);
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var h = (byte)((c.GetHue() / 360.0f) * 255);
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var s = (byte)(c.GetSaturation() * 255);
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var l = (byte)(c.GetBrightness() * 255);
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return new HSLColor(h, s, l);
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}
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public static Color RGBFromHSL(float h, float s, float l)
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{
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// Convert from HSL to RGB
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var q = (l < 0.5f) ? l * (1 + s) : l + s - (l * s);
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var p = 2 * l - q;
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float[] trgb = { h + 1 / 3.0f, h, h - 1 / 3.0f };
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float[] rgb = { 0, 0, 0 };
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for (int k = 0; k < 3; k++)
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{
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while (trgb[k] < 0) trgb[k] += 1.0f;
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while (trgb[k] > 1) trgb[k] -= 1.0f;
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}
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for (int k = 0; k < 3; k++)
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{
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if (trgb[k] < 1 / 6.0f) { rgb[k] = p + ((q - p) * 6 * trgb[k]); }
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else if (trgb[k] >= 1 / 6.0f && trgb[k] < 0.5) { rgb[k] = q; }
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else if (trgb[k] >= 0.5f && trgb[k] < 2.0f / 3) { rgb[k] = p + ((q - p) * 6 * (2.0f / 3 - trgb[k])); }
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else { rgb[k] = p; }
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}
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return Color.FromArgb((int)(rgb[0] * 255), (int)(rgb[1] * 255), (int)(rgb[2] * 255));
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}
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public static bool operator ==(HSLColor me, HSLColor other)
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{
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return me.H == other.H && me.S == other.S && me.L == other.L;
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}
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public static bool operator !=(HSLColor me, HSLColor other) { return !(me == other); }
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public HSLColor(byte h, byte s, byte l)
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{
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H = h;
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S = s;
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L = l;
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RGB = RGBFromHSL(H / 255f, S / 255f, L / 255f);
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}
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public void ToHSV(out float h, out float s, out float v)
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{
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var ll = 2 * L / 255f;
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var ss = S / 255f * ((ll <= 1) ? ll : 2 - ll);
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h = H / 255f;
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s = (2 * ss) / (ll + ss);
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v = (ll + ss) / 2;
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}
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public override string ToString()
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{
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return "{0},{1},{2}".F(H, S, L);
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}
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public override int GetHashCode() { return H.GetHashCode() ^ S.GetHashCode() ^ L.GetHashCode(); }
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public override bool Equals(object obj)
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{
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var o = obj as HSLColor?;
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return o != null && o == this;
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}
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}
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}
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