61 lines
1.3 KiB
C#
61 lines
1.3 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace JYControl
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{
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/// <summary>
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/// Manager for color
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/// </summary>
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public class LBColorManager : Object
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{
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public static double BlendColour(double fg, double bg, double alpha)
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{
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double result = bg + (alpha * (fg - bg));
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if (result < 0.0)
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result = 0.0;
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if (result > 255)
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result = 255;
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return result;
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}
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public static Color StepColor(Color clr, int alpha)
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{
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if (alpha == 100)
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return clr;
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byte a = clr.A;
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byte r = clr.R;
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byte g = clr.G;
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byte b = clr.B;
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float bg = 0;
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int _alpha = Math.Min(alpha, 200);
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_alpha = Math.Max(alpha, 0);
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double ialpha = ((double)(_alpha - 100.0)) / 100.0;
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if (ialpha > 100)
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{
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// blend with white
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bg = 255.0F;
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ialpha = 1.0F - ialpha; // 0 = transparent fg; 1 = opaque fg
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}
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else
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{
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// blend with black
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bg = 0.0F;
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ialpha = 1.0F + ialpha; // 0 = transparent fg; 1 = opaque fg
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}
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r = (byte)(LBColorManager.BlendColour(r, bg, ialpha));
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g = (byte)(LBColorManager.BlendColour(g, bg, ialpha));
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b = (byte)(LBColorManager.BlendColour(b, bg, ialpha));
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return Color.FromArgb(a, r, g, b);
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}
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};
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}
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