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Added extension methods for System.Windows.Media.Color.
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‎ColorSetKit/ColorExtension.cs‎

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/*******************************************************************************
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 Jean-David Gadina - www.imazing.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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******************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace ColorSetKit
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{
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public static class ColorExtension
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{
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private struct HSL
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{
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public double Hue;
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public double Saturation;
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public double Lightness;
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}
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private struct RGB
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{
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public double Red;
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public double Green;
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public double Blue;
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}
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public struct HSLComponents
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{
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public double Hue;
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public double Saturation;
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public double Lightness;
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public double Alpha;
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}
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public struct RGBComponents
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{
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public double Red;
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public double Green;
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public double Blue;
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public double Alpha;
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}
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public static System.Windows.Media.Color FromHSL( double hue, double saturation, double lightness, double alpha )
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{
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RGB rgb = HSLToRGB( hue, saturation, lightness );
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return new System.Windows.Media.Color
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{
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R = ( byte )( Math.Floor( rgb.Red * 255 ) ),
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G = ( byte )( Math.Floor( rgb.Green * 255 ) ),
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B = ( byte )( Math.Floor( rgb.Blue * 255 ) ),
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A = ( byte )( Math.Floor( alpha * 255 ) )
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};
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}
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public static System.Windows.Media.Color BestTextColorForBackgroundColor( System.Windows.Media.Color background )
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{
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return BestTextColorForBackgroundColor( background, System.Windows.Media.Color.FromRgb( 255, 255, 255 ), System.Windows.Media.Color.FromRgb( 0, 0, 0 ) );
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}
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public static System.Windows.Media.Color BestTextColorForBackgroundColor( System.Windows.Media.Color background, System.Windows.Media.Color lightTextColor, System.Windows.Media.Color darkTextColor )
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{
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double r = background.R;
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double g = background.G;
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double b = background.B;
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double contrast = ( ( r * 299 ) + ( g * 287 ) + ( b * 114 ) ) / 1000;
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return ( contrast > 150 ) ? darkTextColor : lightTextColor;
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}
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public static RGBComponents GetRGB( this System.Windows.Media.Color self )
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{
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return new RGBComponents
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{
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Red = self.R / 255.0,
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Green = self.G / 255.0,
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Blue = self.B / 255.0,
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Alpha = self.A / 100.0
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};
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}
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public static HSLComponents GetHSL( this System.Windows.Media.Color self )
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{
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HSL hsl = RGBToHSL( self.R / 255.0, self.G / 255.0, self.B / 255.0 );
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return new HSLComponents
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{
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Hue = hsl.Hue,
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Saturation = hsl.Saturation,
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Lightness = hsl.Lightness,
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Alpha = self.A / 100.0,
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};
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}
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public static System.Windows.Media.Color ByChangingHue( this System.Windows.Media.Color self, double h )
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{
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RGBComponents rgb = self.GetRGB();
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HSL hsl = RGBToHSL( rgb.Red, rgb.Green, rgb.Blue );
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return FromHSL( h, hsl.Saturation, hsl.Lightness, rgb.Alpha );
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}
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public static System.Windows.Media.Color ByChangingSaturation( this System.Windows.Media.Color self, double s )
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{
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RGBComponents rgb = self.GetRGB();
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HSL hsl = RGBToHSL( rgb.Red, rgb.Green, rgb.Blue );
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return FromHSL( hsl.Hue, s, hsl.Lightness, rgb.Alpha );
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}
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public static System.Windows.Media.Color ByChangingLightness( this System.Windows.Media.Color self, double l )
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{
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RGBComponents rgb = self.GetRGB();
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HSL hsl = RGBToHSL( rgb.Red, rgb.Green, rgb.Blue );
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return FromHSL( hsl.Hue, hsl.Saturation, l, rgb.Alpha );
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}
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private static RGB HSLToRGB( double h, double s, double l )
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{
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double t1;
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double t2;
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double[] rgb = { 0, 0, 0 };
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if( s == 0.0 )
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{
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return new RGB { Red = l, Green = l, Blue = l };
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}
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if( l < 0.5 )
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{
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t2 = l * ( 1.0 + s );
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}
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else
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{
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t2 = l + s - ( l * s );
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}
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t1 = ( 2.0 * l ) - t2;
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rgb[ 0 ] = h + ( 1.0 / 3.0 );
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rgb[ 1 ] = h;
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rgb[ 2 ] = h - ( 1.0 / 3.0 );
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for( int i = 0; i < 3; i++ )
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{
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if( rgb[ i ] < 0.0 )
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{
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rgb[ i ] += 1.0;
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}
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else if( rgb[ i ] > 1.0 )
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{
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rgb[ i ] -= 1.0;
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}
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if( rgb[ i ] * 6.0 < 1.0 )
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{
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rgb[ i ] = t1 + ( ( t2 - t1 ) * 6.0 * rgb[ i ] );
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}
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else if( rgb[ i ] * 2.0 < 1.0 )
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{
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rgb[ i ] = t2;
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}
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else if( rgb[ i ] * 3.0 < 2.0 )
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{
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rgb[ i ] = t1 + ( ( t2 - t1 ) * ( ( 2.0 / 3.0 ) - rgb[ i ] ) * 6.0 );
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}
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else
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{
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rgb[ i ] = t1;
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}
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}
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return new RGB { Red = rgb[ 0 ], Green = rgb[ 1 ], Blue = rgb[ 2 ] };
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}
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private static HSL RGBToHSL( double r, double g, double b )
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{
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double v = Math.Max( Math.Max( r, g ), b );
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double m = Math.Min( Math.Min( r, g ), b );
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double h = 0;
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double s = 0;
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double l;
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double vm;
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double r2;
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double g2;
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double b2;
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l = ( m + v ) / 2.0;
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if( l <= 0.0 )
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{
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return new HSL { Hue = h, Saturation = s, Lightness = l };
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}
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vm = v - m;
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s = vm;
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if( s > 0.0 )
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{
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s /= ( ( l <= 0.5 ) ? v + m : 2.0 - v - m );
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}
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else
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{
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return new HSL { Hue = h, Saturation = s, Lightness = l };
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}
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r2 = ( v - r ) / vm;
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g2 = ( v - g ) / vm;
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b2 = ( v - b ) / vm;
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if( r == v )
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{
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h = ( g == m ) ? 5.0 + b2 : 1.0 - g2;
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}
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else if( g == v )
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{
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h = ( b == m ) ? 1.0 + r2 : 3.0 - b2;
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}
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else
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{
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h = ( r == m ) ? 3.0 + g2 : 5.0 - r2;
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}
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h /= 6.0;
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return new HSL { Hue = h, Saturation = s, Lightness = l };
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}
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}
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}

‎ColorSetKit/ColorSetKit.csproj‎

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</ItemGroup>
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<ItemGroup>
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<Compile Include="Color.cs" />
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<Compile Include="ColorExtension.cs" />
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<Compile Include="ColorPair.cs" />
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<Compile Include="ColorSet.cs" />
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<Compile Include="ColorSetStream.cs" />

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