using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Drawing2D ;
using System.Runtime.InteropServices;
namespace WindowsApplication2
{
  /// <summary> 
  /// Summary description for Form1. 
  /// </summary> 
 public class Form1 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Panel panel1;
  private System.Windows.Forms.Label label1;
  private System.Windows.Forms.Label label2;
  private System.Windows.Forms.Label label3;
  private System.Windows.Forms.NumericUpDown numericUpDown1;
  private System.Windows.Forms.NumericUpDown numericUpDown2;
  private System.Windows.Forms.NumericUpDown numericUpDown3;
   /// <summary> 
   /// Required designer variable. 
   /// </summary> 
  private System.ComponentModel.Container components = null;
  public Form1()
  {
    // 
    // Required for Windows Form Designer support 
    // 
   InitializeComponent();

    // 
    // TODO: Add any constructor code after InitializeComponent call 
    // 
  }
   /// <summary> 
   /// Clean up any resources being used. 
   /// </summary> 
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null) 
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }
  #region Windows Form Designer generated code
   /// <summary> 
   /// Required method for Designer support - do not modify 
   /// the contents of this method with the code editor. 
   /// </summary> 
  private void InitializeComponent()
  {
   this.panel1 = new System.Windows.Forms.Panel();
   this.label1 = new System.Windows.Forms.Label();
   this.label2 = new System.Windows.Forms.Label();
   this.label3 = new System.Windows.Forms.Label();
   this.numericUpDown1 = new System.Windows.Forms.NumericUpDown();
   this.numericUpDown2 = new System.Windows.Forms.NumericUpDown();
   this.numericUpDown3 = new System.Windows.Forms.NumericUpDown();
   ((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).BeginInit();
   ((System.ComponentModel.ISupportInitialize)(this.numericUpDown2)).BeginInit();
   ((System.ComponentModel.ISupportInitialize)(this.numericUpDown3)).BeginInit();
   this.SuspendLayout();
    //  
    // panel1 
    //  
   this.panel1.Location = new System.Drawing.Point(16, 16);
   this.panel1.Name = "panel1";
   this.panel1.Size = new System.Drawing.Size(216, 120);
   this.panel1.TabIndex = 0;
   this.panel1.Paint += new System.Windows.Forms.PaintEventHandler(this.panel1_Paint);
   this.panel1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseMove);
    //  
    // label1 
    //  
   this.label1.Location = new System.Drawing.Point(32, 160);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(56, 23);
   this.label1.TabIndex = 1;
   this.label1.Text = "Красный";
    //  
    // label2 
    //  
   this.label2.Location = new System.Drawing.Point(32, 192);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(56, 23);
   this.label2.TabIndex = 1;
   this.label2.Text = "Зеленый";
    //  
    // label3 
    //  
   this.label3.Location = new System.Drawing.Point(32, 224);
   this.label3.Name = "label3";
   this.label3.Size = new System.Drawing.Size(56, 23);
   this.label3.TabIndex = 1;
   this.label3.Text = "Синий";
    //  
    // numericUpDown1 
    //  
   this.numericUpDown1.Location = new System.Drawing.Point(112, 160);
   this.numericUpDown1.Maximum = new System.Decimal(new int[] {
                     255,
                     0,
                     0,
                     0});
   this.numericUpDown1.Name = "numericUpDown1";
   this.numericUpDown1.Size = new System.Drawing.Size(48, 20);
   this.numericUpDown1.TabIndex = 2;
    //  
    // numericUpDown2 
    //  
   this.numericUpDown2.Location = new System.Drawing.Point(112, 192);
   this.numericUpDown2.Maximum = new System.Decimal(new int[] {
                     255,
                     0,
                     0,
                     0});
   this.numericUpDown2.Name = "numericUpDown2";
   this.numericUpDown2.Size = new System.Drawing.Size(48, 20);
   this.numericUpDown2.TabIndex = 2;
    //  
    // numericUpDown3 
    //  
   this.numericUpDown3.Location = new System.Drawing.Point(112, 224);
   this.numericUpDown3.Maximum = new System.Decimal(new int[] {
                     255,
                     0,
                     0,
                     0});
   this.numericUpDown3.Name = "numericUpDown3";
   this.numericUpDown3.Size = new System.Drawing.Size(48, 20);
   this.numericUpDown3.TabIndex = 2;
    //  
    // Form1 
    //  
   this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
   this.ClientSize = new System.Drawing.Size(292, 273);
   this.Controls.Add(this.numericUpDown1);
   this.Controls.Add(this.label1);
   this.Controls.Add(this.panel1);
   this.Controls.Add(this.label2);
   this.Controls.Add(this.label3);
   this.Controls.Add(this.numericUpDown2);
   this.Controls.Add(this.numericUpDown3);
   this.Name = "Form1";
   this.Text = "Form1";
   ((System.ComponentModel.ISupportInitialize)(this.numericUpDown1)).EndInit();
   ((System.ComponentModel.ISupportInitialize)(this.numericUpDown2)).EndInit();
   ((System.ComponentModel.ISupportInitialize)(this.numericUpDown3)).EndInit();
   this.ResumeLayout(false);
  }
  #endregion
   
   /// <summary> 
   /// The main entry point for the application. 
   /// </summary> 
  [STAThread]
  static void Main() 
  {
   Application.Run(new Form1());
  }
  private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
   LinearGradientBrush br = new LinearGradientBrush(this.panel1.ClientRectangle,Color.Black,Color.Black,0,false); 
   ColorBlend cb = new ColorBlend(); 
   cb.Positions=new float[8]; 
   int i=0; 
   for(float f=0;f<=1;f+=1.0f/7) 
    cb.Positions[i++]=f; 
   cb.Colors=new Color[]{Color.Red,Color.Orange,Color.Yellow,Color.Green,Color.Blue,Color.Indigo,Color.Violet, Color.Black }; 
   br.InterpolationColors=cb; 
   e.Graphics.FillRectangle(br,0,0,this.panel1.Width ,this.panel1 .Height ); 
   
  }
  void SelectColor(Color _color)
  {
   this.numericUpDown1.Value = _color.R;
   this.numericUpDown2.Value =_color.G;
   this.numericUpDown3.Value = _color.B;
  }
  private void panel1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
  {
   Graphics graphics = this.panel1.CreateGraphics();
   IntPtr hDC = graphics.GetHdc();
   Color color = GetPixelColor(hDC, e.X, e.Y);
   
    SelectColor(color);
   
   graphics.ReleaseHdc(hDC);
    
   base.OnMouseMove(e);
  }
  [DllImport("Gdi32.dll")]
  static extern int GetPixel(
   IntPtr hdc,    
   int nXPos, 
   int nYPos  
   );
  public static Color GetPixelColor(IntPtr hDC, int x, int y)
  {
   long colorRef = GetPixel(hDC, x, y);
   return Color.FromArgb((byte)colorRef, (byte)(colorRef >> 8), (byte)(colorRef >> 16));
  }
 }
}