using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

using System.Runtime.InteropServices;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using Microsoft.Ink;

namespace tabletSnip
{
	/// <summary>
	/// Summary description for MySnip.
	/// </summary>
	public class MySnip : System.Windows.Forms.Form
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public MySnip()
		{
			//
			// 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.pictureBox1 = new System.Windows.Forms.PictureBox();
			this.SuspendLayout();
			// 
			// pictureBox1
			// 
			this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill;
			this.pictureBox1.Location = new System.Drawing.Point(0, 0);
			this.pictureBox1.Name = "pictureBox1";
			this.pictureBox1.Size = new System.Drawing.Size(288, 280);
			this.pictureBox1.TabIndex = 0;
			this.pictureBox1.TabStop = false;
			this.pictureBox1.DoubleClick += new System.EventHandler(this.pictureBox1_DoubleClick);
			// 
			// MySnip
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.BackColor = System.Drawing.SystemColors.Control;
			this.ClientSize = new System.Drawing.Size(288, 280);
			this.Controls.Add(this.pictureBox1);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
			this.Name = "MySnip";
			this.ShowInTaskbar = false;
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.TopMost = true;
			this.Load += new System.EventHandler(this.MySnip_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new MySnip());
		}

		private System.Windows.Forms.PictureBox pictureBox1;		

		InkOverlay io = null;

		private void MySnip_Load(object sender, System.EventArgs e)
		{
			this.Location = new Point(0, 0);
			this.Size = new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
			this.Opacity = .1;
			//io = new InkOverlay(this.Handle);
			io = new InkOverlay(pictureBox1.Handle);
			io.Stroke += new InkCollectorStrokeEventHandler(StrokeEvent);
			io.Enabled = true;
		}

		private Rectangle InkToPixelRectangle(Rectangle inkRect)
		{
			Rectangle pixelRect;
			Point upperLeft = new Point(inkRect.Left, inkRect.Top);
			Point lowerRight = new Point(inkRect.Right, inkRect.Bottom);
			io.Renderer.InkSpaceToPixel(io.Handle, ref upperLeft);
			io.Renderer.InkSpaceToPixel(io.Handle, ref lowerRight);
			int iWidth = lowerRight.X - upperLeft.X;
			int iHeight = lowerRight.Y - upperLeft.Y;
			pixelRect = new Rectangle(upperLeft.X, upperLeft.Y, iWidth, iHeight);
			return pixelRect;
		}

		private Point [] ZeroPointArray(Rectangle r, Point [] pa)
		{
			int x, y;
			for(int i=0; i<pa.Length; i++)
			{
				x = pa[i].X - r.X;				
				y = pa[i].Y - r.Y;
				pa[i] = new Point(x, y);
			}
			return pa;
		}

		[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
		public static extern bool BitBlt(
			IntPtr hdcDest, // handle to destination DC
			int nXDest,  // x-coord of destination upper-left corner
			int nYDest,  // y-coord of destination upper-left corner
			int nWidth,  // width of destination rectangle
			int nHeight, // height of destination rectangle
			IntPtr hdcSrc,  // handle to source DC
			int nXSrc,   // x-coordinate of source upper-left corner
			int nYSrc,   // y-coordinate of source upper-left corner
			System.Int32 dwRop  // raster operation code
			);

		[System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
		public static extern IntPtr  CreateDC(
			string lpszDriver,        // driver name
			string lpszDevice,        // device name
			string lpszOutput,        // not used; should be NULL
			IntPtr lpInitData	// optional printer data
			);

		private void StrokeEvent(object sender, InkCollectorStrokeEventArgs e)
		{
			Stroke s = e.Stroke;
			Rectangle ir = s.GetBoundingBox();
			Rectangle pr = this.InkToPixelRectangle(ir);;
			Point [] pa = s.GetPoints();
			io.Renderer.InkSpaceToPixel(io.Handle, ref pa);
			io.Enabled = false;
			//MessageBox.Show(pa[0].X.ToString() + ":" + pa[0].Y.ToString());

			Bitmap b = null;
			IntPtr dc1 = CreateDC("DISPLAY", null, null, (IntPtr)null);
			Graphics g1 = Graphics.FromHdc(dc1);

			//move to working on bitmap and not screen
			//g1.DrawPolygon(new Pen(Color.LightGray, 2), pa);
			//g1.FillPolygon(new SolidBrush(Color.Black), pa);
			
			b = new Bitmap(pr.Width, pr.Height, g1);
			Graphics g2 = Graphics.FromImage(b);			
			this.Visible = false;
			dc1 = g1.GetHdc();
			IntPtr dc2 = g2.GetHdc();
			BitBlt(dc2, 0, 0, pr.Width, pr.Height, dc1, pr.X, pr.Y, 13369376);
			g1.ReleaseHdc(dc1);
			g2.ReleaseHdc(dc2);
						
			Graphics g3 = Graphics.FromImage(b);
			GraphicsPath gp = new GraphicsPath();
			pa = this.ZeroPointArray(pr, pa);
			gp.AddPolygon(pa);
			g3.SetClip(new Region(gp), CombineMode.Exclude);
			g3.FillRectangle(Brushes.White, 0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
			//b.Save(@"C:\Captured.jpg", ImageFormat.Jpeg);
			Clipboard.SetDataObject(b, true);

			/*
			//display in pictureBox for testing
			this.Size = new Size(b.Width, b.Height);
			pictureBox1.Image = b;
			this.Opacity = 1;
			this.Show();
			*/

			Application.Exit();
		}

		private void pictureBox1_DoubleClick(object sender, System.EventArgs e)
		{
			Application.Exit();
		}
	}
}