Adobe Color Picker Clone

using System;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace DrawingEx.ColorManagement.ColorModels.Selection
{
	public abstract class ColorSelectionModuleRGB:ColorSelectionModule
	{
		#region variables
		protected Color _color;
		#endregion
		#region properties
		public override XYZ XYZ
		{
			get
			{
				return XYZ.FromRGB(_color);
			}
			set
			{
				Color newcolor=value.ToRGB();
				if(newcolor==_color) return;
				_color=newcolor;
				//update controls
				UpdatePlaneImage();
				UpdatePlanePosition();
				UpdateFaderImage();
				UpdateFaderPosition();
			}
		}
		#endregion
	}
	public class ColorSelectionModuleRGB_R:ColorSelectionModuleRGB
	{
		#region colorfader
		protected override void OnUpdateFaderImage(Bitmap bmp)
		{
			using(Graphics gr=Graphics.FromImage(bmp))
			{
				using(LinearGradientBrush brs=new LinearGradientBrush(
						  new Point(0,0),new Point(bmp.Width),
						  Color.FromArgb(0,_color.G,_color.B),
						  Color.FromArgb(255,_color.G,_color.B)))
				{
					gr.FillRectangle(brs, new Rectangle(Point.Empty,bmp.Size));
				}
			}
		}
		protected override void OnUpdateFaderPosition(ColorSelectionFader fader)
		{
			fader.Position=(double)(_color.R)/255.0;
		}
		protected override void OnFaderScroll(ColorSelectionFader fader)
		{
			int newred=Math.Max(0,Math.Min(255,(int)(fader.Position*255.0)));
			if(newred==_color.R) return;
			_color=Color.FromArgb(newred,_color.G,_color.B);
			UpdatePlaneImage();
			RaiseColorChanged();
		}
		#endregion
		#region colorplane
		protected override void OnUpdatePlaneImage(Bitmap bmp)
		{
			double green=255.0,
				delta_green=-255.0/(double)bmp.Height;
			Color[] lincols=new Color[2];
			using(Graphics gr=Graphics.FromImage(bmp))
			{
				using(LinearGradientBrush brs=new LinearGradientBrush(
						  new Point(0,0),new Point(bmp.Width,0),
						  Color.White,Color.White))
				{
					for (int y=0; y<bmp.Height; y++, green+=delta_green)
					{
						int g=Math.Max(0,Math.Min(255,(int)green));
						lincols[0]=Color.FromArgb(_color.R,g,0);
						lincols[1]=Color.FromArgb(_color.R,g,255);

						brs.LinearColors=lincols;
						gr.FillRectangle(brs,0,y,bmp.Width,1);
					}
				}
			}
		}
		protected override void OnUpdatePlanePosition(ColorSelectionPlane plane)
		{
			plane.SetPosition((double)(_color.B)/255.0,
				1.0-(double)(_color.G)/255.0);
		}
		protected override void OnPlaneScroll(ColorSelectionPlane plane)
		{
			int newgreen=Math.Max(0,Math.Min(255,(int)(255.0-plane.PositionY*255.0))),
				newblue=Math.Max(0,Math.Min(255,(int)(plane.PositionX*255.0)));
			if(_color.G==newgreen &&
				_color.B==newblue) return;
			_color=Color.FromArgb(_color.R,newgreen,newblue);
			UpdateFaderImage();
			RaiseColorChanged();
		}
		#endregion
	}
	public class ColorSelectionModuleRGB_G:ColorSelectionModuleRGB
	{
		#region colorfader
		protected override void OnUpdateFaderImage(Bitmap bmp)
		{
			using(Graphics gr=Graphics.FromImage(bmp))
			{
				using(LinearGradientBrush brs=new LinearGradientBrush(
						  new Point(0,0),new Point(bmp.Width),
						  Color.FromArgb(_color.R,0,_color.B),
						  Color.FromArgb(_color.R,255,_color.B)))
				{
					gr.FillRectangle(brs, new Rectangle(Point.Empty,bmp.Size));
				}
			}
		}
		protected override void OnUpdateFaderPosition(ColorSelectionFader fader)
		{
			fader.Position=(double)(_color.G)/255.0;
		}
		protected override void OnFaderScroll(ColorSelectionFader fader)
		{
			int newgreen=Math.Max(0,Math.Min(255,(int)(fader.Position*255.0)));
			if(newgreen==_color.G) return;
			_color=Color.FromArgb(_color.R,newgreen,_color.B);
			UpdatePlaneImage();
			RaiseColorChanged();
		}
		#endregion
		#region colorplane
		protected override void OnUpdatePlaneImage(Bitmap bmp)
		{
			double red=255.0,
				delta_red=-255.0/(double)bmp.Height;
			Color[] lincols=new Color[2];
			using(Graphics gr=Graphics.FromImage(bmp))
			{
				using(LinearGradientBrush brs=new LinearGradientBrush(
						  new Point(0,0),new Point(bmp.Width,0),
						  Color.White,Color.White))
				{
					for (int y=0; y<bmp.Height; y++, red+=delta_red)
					{
						int r=Math.Max(0,Math.Min(255,(int)red));
						lincols[0]=Color.FromArgb(r,_color.G,0);
						lincols[1]=Color.FromArgb(r,_color.G,255);

						brs.LinearColors=lincols;
						gr.FillRectangle(brs,0,y,bmp.Width,1);
					}
				}
			}
		}
		protected override void OnUpdatePlanePosition(ColorSelectionPlane plane)
		{
			plane.SetPosition((double)(_color.B)/255.0,
				1.0-(double)(_color.R)/255.0);
		}
		protected override void OnPlaneScroll(ColorSelectionPlane plane)
		{
			int newred=Math.Max(0,Math.Min(255,(int)(255.0-plane.PositionY*255.0))),
				newblue=Math.Max(0,Math.Min(255,(int)(plane.PositionX*255.0)));
			if(_color.R==newred &&
				_color.B==newblue) return;
			_color=Color.FromArgb(newred,_color.G,newblue);
			UpdateFaderImage();
			RaiseColorChanged();
		}
		#endregion
	}
	public class ColorSelectionModuleRGB_B:ColorSelectionModuleRGB
	{
		#region colorfader
		protected override void OnUpdateFaderImage(Bitmap bmp)
		{
			using(Graphics gr=Graphics.FromImage(bmp))
			{
				using(LinearGradientBrush brs=new LinearGradientBrush(
						  new Point(0,0),new Point(bmp.Width),
						  Color.FromArgb(_color.R,_color.G,0),
						  Color.FromArgb(_color.R,_color.G,255)))
				{
					gr.FillRectangle(brs, new Rectangle(Point.Empty,bmp.Size));
				}
			}
		}
		protected override void OnUpdateFaderPosition(ColorSelectionFader fader)
		{
			fader.Position=(double)(_color.B)/255.0;
		}
		protected override void OnFaderScroll(ColorSelectionFader fader)
		{
			int newblue=Math.Max(0,Math.Min(255,(int)(fader.Position*255.0)));
			if(newblue==_color.B) return;
			_color=Color.FromArgb(_color.R,_color.G,newblue);
			UpdatePlaneImage();
			RaiseColorChanged();
		}
		#endregion
		#region colorplane
		protected override void OnUpdatePlaneImage(Bitmap bmp)
		{
			double green=255.0,
				delta_green=-255.0/(double)bmp.Height;
			Color[] lincols=new Color[2];
			using(Graphics gr=Graphics.FromImage(bmp))
			{
				using(LinearGradientBrush brs=new LinearGradientBrush(
						  new Point(0,0),new Point(bmp.Width,0),
						  Color.White,Color.White))
				{
					for (int y=0; y<bmp.Height; y++, green+=delta_green)
					{
						int g=Math.Max(0,Math.Min(255,(int)green));
						lincols[0]=Color.FromArgb(0,g,_color.B);
						lincols[1]=Color.FromArgb(255,g,_color.B);

						brs.LinearColors=lincols;
						gr.FillRectangle(brs,0,y,bmp.Width,1);
					}
				}
			}
		}
		protected override void OnUpdatePlanePosition(ColorSelectionPlane plane)
		{
			plane.SetPosition((double)(_color.R)/255.0,
				1.0-(double)(_color.G)/255.0);
		}
		protected override void OnPlaneScroll(ColorSelectionPlane plane)
		{
			int newgreen=Math.Max(0,Math.Min(255,(int)(255.0-plane.PositionY*255.0))),
				newred=Math.Max(0,Math.Min(255,(int)(plane.PositionX*255.0)));
			if(_color.R==newred &&
				_color.G==newgreen) return;
			_color=Color.FromArgb(newred,newgreen,_color.B);
			UpdateFaderImage();
			RaiseColorChanged();
		}
		#endregion
	}
}