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Viewing changes to external/xwt/Xwt/Xwt.Drawing/HslColor.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/xwt/Xwt/Xwt.Drawing/HslColor.cs
 
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// 
 
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// HslColor.cs
 
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//  
 
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// Author:
 
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//       Mike Krüger <mkrueger@novell.com>
 
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// 
 
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// Copyright (c) 2009 Xamarin, Inc (http://www.xamarin.com)
 
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// 
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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// 
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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// 
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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namespace Xwt.Drawing
 
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{
 
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        class HslColor
 
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        {
 
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                public double H {
 
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                        get;
 
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                        set;
 
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                }
 
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                public double S {
 
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                        get;
 
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                        set;
 
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                }
 
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                public double L {
 
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                        get;
 
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                        set;
 
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                }
 
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                public HslColor ()
 
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                {
 
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                }
 
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                public HslColor (double h, double s, double 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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                }
 
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                public static implicit operator Color (HslColor hsl)
 
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                {
 
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                        if (hsl.L > 1) hsl.L = 1;
 
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                        if (hsl.L < 0) hsl.L = 0;
 
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                        if (hsl.H > 1) hsl.H = 1;
 
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                        if (hsl.H < 0) hsl.H = 0;
 
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                        if (hsl.S > 1) hsl.S = 1;
 
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                        if (hsl.S < 0) hsl.S = 0;
 
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                        double r = 0, g = 0, b = 0;
 
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                        if (hsl.L == 0)
 
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                                return new Color (0f, 0f, 0f);
 
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                        if (hsl.S == 0) {
 
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                                r = g = b = hsl.L;
 
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                        } else {
 
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                                double temp2 = hsl.L <= 0.5 ? hsl.L * (1.0 + hsl.S) : hsl.L + hsl.S -(hsl.L * hsl.S);
 
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                                double temp1 = 2.0 * hsl.L - temp2;
 
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                                double[] t3 = new double[] { hsl.H + 1.0 / 3.0, hsl.H, hsl.H - 1.0 / 3.0};
 
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                                double[] clr= new double[] { 0, 0, 0};
 
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                                for (int i = 0; i < 3; i++) {
 
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                                        if (t3[i] < 0)
 
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                                                t3[i] += 1.0;
 
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                                        if (t3[i] > 1)
 
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                                                t3[i]-=1.0;
 
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                                        if (6.0 * t3[i] < 1.0)
 
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                                                clr[i] = temp1 + (temp2 - temp1) * t3[i] * 6.0;
 
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                                        else if (2.0 * t3[i] < 1.0)
 
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                                                clr[i] = temp2;
 
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                                        else if (3.0 * t3[i] < 2.0)
 
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                                                clr[i] = (temp1 + (temp2 - temp1) * ((2.0 / 3.0) - t3[i]) * 6.0);
 
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                                        else
 
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                                                clr[i] = temp1;
 
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                                }
 
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                                r = clr[0];
 
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                                g = clr[1];
 
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                                b = clr[2];
 
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                        }
 
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                        return new Color (r, g, b);
 
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                }
 
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                public static implicit operator HslColor (Color color)
 
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                {
 
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                        return new HslColor (color);
 
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                }
 
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                public HslColor (Color color)
 
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                {
 
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                        double r = color.Red;
 
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                        double g = color.Green;
 
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                        double b = color.Blue;
 
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                        double v = System.Math.Max (r, g);
 
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                        v = System.Math.Max (v, b);
 
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                        double m = System.Math.Min (r, g);
 
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                        m = System.Math.Min (m, b);
 
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                        this.L = (m + v) / 2.0;
 
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                        if (this.L <= 0.0)
 
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                                return;
 
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                        double vm = v - m;
 
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                        this.S = vm;
 
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                        if (this.S > 0.0) {
 
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                                this.S /= (this.L <= 0.5) ? (v + m) : (2.0 - v - m);
 
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                        } else {
 
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                                return;
 
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                        }
 
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                        double r2 = (v - r) / vm;
 
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                        double g2 = (v - g) / vm;
 
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                        double b2 = (v - b) / vm;
 
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                        if (r == v) {
 
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                                this.H = (g == m ? 5.0 + b2 : 1.0 - g2);
 
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                        } else if (g == v) {
 
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                                this.H = (b == m ? 1.0 + r2 : 3.0 - b2);
 
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                        } else {
 
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                                this.H = (r == m ? 3.0 + g2 : 5.0 - r2);
 
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                        }
 
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                        this.H /= 6.0;
 
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                }
 
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                public static double Brightness (Color c)
 
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                {
 
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                        double r = c.Red / (double)ushort.MaxValue;
 
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                        double g = c.Green / (double)ushort.MaxValue;
 
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                        double b = c.Blue / (double)ushort.MaxValue;
 
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                        return System.Math.Sqrt (r * .241 + g * .691 + b * .068);
 
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                }
 
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                public override string ToString ()
 
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                {
 
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                        return string.Format ("[HslColor: H={0}, S={1}, L={2}]", H, S, L);
 
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                }
 
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        }
 
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}