ExtractPad.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace JColorPad
{
    public class ColorChangedEventArgs : EventArgs {
        public Color NewColor { get; set; }

        public Color OldColor { get; set; }
        public ColorChangedEventArgs(Color newColor,Color oldColor) {

            this.NewColor = newColor;
            this.OldColor = oldColor;
        }
    }
    public partial class ExtractPad : Control
    {
        public ExtractPad()
        {
            InitializeComponent();
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.DoubleBuffered = true;
        }


        public event EventHandler<ColorChangedEventArgs> SelectedColorChanged;

        private Color _selectedColor;
        public Color SelectedColor {
            get {
                return _selectedColor;
            }
            set {
                if (SelectedColorChanged != null)
                {
                    SelectedColorChanged(this, new ColorChangedEventArgs(value, _selectedColor));
                }
                _selectedColor = value;
            }
        }

        public Bitmap Background{
            get;
            set;
        }


        private Point _centerPoint;
        public Point CenterPoint
        {
            get
            {
                return _centerPoint;
            }