lyfz_repos/铂金版源码/LYFZ.PhotoSelectSystem/其它/C#多功能画图板源码/old/code/GE.cs

/*****************************************************************************************
**                   *****************************************                          ** 
**                   **********File name:Ge.cs, Version 1.0, 8 November 2004**			**
**	*************************Authors: MingZhang and Mayank Bansal********************	**
**                    *****************************************                         ** 
**                                                                                      ** 
** This class provides an interface between user and functions. The form gets loaded    ** 
** when software is opened. It captures various actions performed by user and it calls  ** 
** corresponding functions to be implemented for the actions.                           **  
** The following classes are defined here:                                              ** 
**     1.GE:  This class loads the form and it is the main entry point of software.     ** 
** 	   2.Canvas: All the drawing in Graphical Editor is done on the canvas.             ** 
**               Canvas class is used to define the drawing area						** 	
**     3.GraEditStackMgr: This class is used to perform Redo and Undo operations        ** 
**                                                                                      ** 
******************************************************************************************/

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Imaging;
using  System.IO;
using System.Drawing.Printing;
using System.Diagnostics;

using DockToolbar;

using GraEditor.DrawTools;
using GraEditor.Elements;

namespace GraEditor
{
	/// <summary>
	///Main windows of Graphic Editor
	/// </summary>
	public class GE : System.Windows.Forms.Form
	{
		private MainView mainView;								//Inherit from System.Windows.Forms.Panel
		private System.Windows.Forms.ContextMenu contextMenu1;
		private System.Windows.Forms.ToolBarButton tlBtnLine;
		private System.Windows.Forms.ToolBarButton tlBtnFrameRect;
		private System.Windows.Forms.ToolBarButton tlBtnFillRect;
		private System.Windows.Forms.ToolBarButton tlBtnZoomIn;
		private System.Windows.Forms.ToolBarButton tlBtnZoomOut;
		private System.Windows.Forms.ToolBarButton tlBtnZoomResume;
		private System.Windows.Forms.MenuItem pasteMenuItem;
		private System.Windows.Forms.ToolBarButton tlBtnFrameEllipse;
		private System.Windows.Forms.ToolBarButton tlBtnFillEllipse;
		private System.Windows.Forms.ToolBarButton tlBtnImage;
		private System.Windows.Forms.ToolBarButton tlBtnText;
		private System.Windows.Forms.ToolBarButton tlBtnLines;
		private System.Windows.Forms.MainMenu mainMenu1;
		private System.Windows.Forms.MenuItem menuItem12;
		private System.Windows.Forms.MenuItem menuNew;
		private System.Windows.Forms.MenuItem menuFile;
		private System.Windows.Forms.MenuItem menuOpen;
		private System.Windows.Forms.MenuItem menuSave;
		private System.Windows.Forms.MenuItem menuSaveAs;
		private System.Windows.Forms.MenuItem menuExit;
		private System.Windows.Forms.MenuItem menuUndo;
		private System.Windows.Forms.MenuItem menuRedo;
		private System.Windows.Forms.MenuItem menuCopy;
		private System.Windows.Forms.MenuItem menuCut;
		private System.Windows.Forms.MenuItem menuView;
		private System.Windows.Forms.MenuItem menuImgSetting;
		private System.Windows.Forms.MenuItem menuHelp;
		private System.Windows.Forms.ToolBarButton tlBtnErase;
		private System.Windows.Forms.MenuItem menuItemCanvasBackColor;
		private System.Windows.Forms.ToolBarButton sep2;
		private System.Windows.Forms.ToolBarButton sep3;
		private System.Windows.Forms.ToolBarButton sep4;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem menuItem5;
		private System.Windows.Forms.MenuItem menuItem4;
		private System.Windows.Forms.MenuItem menuItem24;
		private System.Windows.Forms.MenuItem menuPrint;
		private System.Windows.Forms.MenuItem menuRecentFiles;
		private System.Windows.Forms.MenuItem menuEdit;
		private System.Windows.Forms.MenuItem menuZoom;
		private System.Windows.Forms.MenuItem menuZoomIn;
		private System.Windows.Forms.MenuItem menuZoomOut;
		private System.Windows.Forms.MenuItem menuResume;
		private System.Windows.Forms.MenuItem menuColorSettings;
		private System.Windows.Forms.MenuItem menuHelpIndex;
		private System.Windows.Forms.MenuItem menuAboutGE;
		private System.Windows.Forms.MenuItem menuStatusBar;
		private System.Windows.Forms.ImageList GE_imageList;
		private System.Windows.Forms.ToolBar GE_toolBar;
		private System.Windows.Forms.StatusBar GE_statusBar;
		private System.ComponentModel.IContainer components;
		private Chris.Beckett.MenuImageLib.MenuImage _menuImages;
		private System.Windows.Forms.MenuItem menuToolbar;
		private System.Windows.Forms.ToolBar GE_toolBar1;
		private System.Windows.Forms.ToolBarButton tlBtnNew;
		private System.Windows.Forms.ToolBarButton tlBtnOpen;
		private System.Windows.Forms.ToolBarButton tlBtnSave;
		private System.Windows.Forms.ToolBarButton sp1;
		private System.Windows.Forms.ToolBarButton tlBtnSelect;
		private System.Windows.Forms.ToolBarButton tlBtnCopy;
		private System.Windows.Forms.ToolBarButton tlBtnCut;
		private System.Windows.Forms.ToolBarButton sp2;
		private System.Windows.Forms.ToolBarButton sp5;
		private System.Windows.Forms.ToolBarButton tlBtnUndo;
		private System.Windows.Forms.ToolBarButton tlBtnRedo;
		private System.Windows.Forms.ToolBarButton tlBtnFont;
		private System.Windows.Forms.ToolBarButton tlBtnColor;
		private System.Drawing.Printing.PrintDocument printDocument1;
		private System.Windows.Forms.PrintPreviewDialog printPreviewDialog1;
		private System.Windows.Forms.PageSetupDialog pageSetupDialog1;
		private System.Windows.Forms.MenuItem menuPrintPreview;
		private System.Windows.Forms.MenuItem menuPageSetting;
		private System.Windows.Forms.ToolBarButton tlBtnPenWidth;
		private System.Windows.Forms.ContextMenu muPenWidth;
		private System.Windows.Forms.StatusBarPanel sbPanelTip;
		private System.Windows.Forms.StatusBarPanel sbPanelViewScale;
		private System.Windows.Forms.StatusBarPanel sbPanelMousePos;
		private System.Windows.Forms.MenuItem menuItemCanvasSize;
		private System.Windows.Forms.ToolBarButton tlBtnFreehand;
		private System.Windows.Forms.StatusBarPanel sbPanelFont;
		ToolBarManager _toolBarManager;

		public GE()
		{
			//
			// Required for Windows Form Designer support.
			//
			InitializeComponent();
			InitPenWidthToolBarButton();

			//
			// TODO: InitializeComponent 
			//
			
			this.sbPanelViewScale.Text ="100%";
			

			Canvas canvas = Canvas.Instance;
			canvas.MainView = this.mainView;
			canvas.Modified +=new EventHandler(canvas_Modified);

			canvas.Init(null,new Size(600,600),Color.White);
			
			// The parameter to the constructor sets the form where the toolbars can be docked.
			// This would be your application main form
			_toolBarManager = new ToolBarManager(this, this);
			

			// The control Text property is used to draw the bar name while floating
			// and on view/hide menu.
			//_toolBar1.Text = "Bar #1";
			GE_toolBar.Text = "Drawing Toolbar";
			GE_toolBar1.Text = "File Operations";
			_toolBarManager.AddControl(GE_toolBar, DockStyle.Left);
			
			_toolBarManager.AddControl(GE_toolBar1,DockStyle.Top);
			
			InitGraDrawTool();

			UpdateColorBtnImage(DrawEnvMgr.Instance.Color);


			InitRecentFilesMgr();


			GraDrawTool.ActiveStateChanged +=new EventHandler(GraDrawTool_ActiveStateChanged);
			this.mainView.MouseMove += new MouseEventHandler(mainView_MouseMove);


			InitEditStackMgr();

			UpdateFontPanel();
			

			//Set Freehand draw tool as default
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Freehand);
			this.tlBtnFreehand.Pushed = true;


		}

		/// <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 
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.

		/// </summary>
		private void InitializeComponent()
		{
			this.components = new System.ComponentModel.Container();
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(GE));
			this.GE_toolBar = new System.Windows.Forms.ToolBar();
			this.tlBtnErase = new System.Windows.Forms.ToolBarButton();
			this.sep2 = new System.Windows.Forms.ToolBarButton();
			this.tlBtnLine = new System.Windows.Forms.ToolBarButton();
			this.tlBtnLines = new System.Windows.Forms.ToolBarButton();
			this.tlBtnFreehand = new System.Windows.Forms.ToolBarButton();
			this.tlBtnFrameRect = new System.Windows.Forms.ToolBarButton();
			this.tlBtnFillRect = new System.Windows.Forms.ToolBarButton();
			this.tlBtnFrameEllipse = new System.Windows.Forms.ToolBarButton();
			this.tlBtnFillEllipse = new System.Windows.Forms.ToolBarButton();
			this.tlBtnImage = new System.Windows.Forms.ToolBarButton();
			this.tlBtnText = new System.Windows.Forms.ToolBarButton();
			this.sep3 = new System.Windows.Forms.ToolBarButton();
			this.tlBtnZoomIn = new System.Windows.Forms.ToolBarButton();
			this.tlBtnZoomOut = new System.Windows.Forms.ToolBarButton();
			this.tlBtnZoomResume = new System.Windows.Forms.ToolBarButton();
			this.sep4 = new System.Windows.Forms.ToolBarButton();
			this.GE_imageList = new System.Windows.Forms.ImageList(this.components);
			this.mainView = new GraEditor.MainView();
			this.contextMenu1 = new System.Windows.Forms.ContextMenu();
			this.pasteMenuItem = new System.Windows.Forms.MenuItem();
			this.menuItemCanvasBackColor = new System.Windows.Forms.MenuItem();
			this.menuItemCanvasSize = new System.Windows.Forms.MenuItem();
			this.GE_statusBar = new System.Windows.Forms.StatusBar();
			this.sbPanelTip = new System.Windows.Forms.StatusBarPanel();
			this.sbPanelFont = new System.Windows.Forms.StatusBarPanel();
			this.sbPanelViewScale = new System.Windows.Forms.StatusBarPanel();
			this.sbPanelMousePos = new System.Windows.Forms.StatusBarPanel();
			this.mainMenu1 = new System.Windows.Forms.MainMenu();
			this.menuFile = new System.Windows.Forms.MenuItem();
			this.menuNew = new System.Windows.Forms.MenuItem();
			this.menuOpen = new System.Windows.Forms.MenuItem();
			this.menuSave = new System.Windows.Forms.MenuItem();
			this.menuSaveAs = new System.Windows.Forms.MenuItem();
			this.menuItem5 = new System.Windows.Forms.MenuItem();
			this.menuPrint = new System.Windows.Forms.MenuItem();
			this.menuPrintPreview = new System.Windows.Forms.MenuItem();
			this.menuPageSetting = new System.Windows.Forms.MenuItem();
			this.menuItem4 = new System.Windows.Forms.MenuItem();
			this.menuRecentFiles = new System.Windows.Forms.MenuItem();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.menuExit = new System.Windows.Forms.MenuItem();
			this.menuEdit = new System.Windows.Forms.MenuItem();
			this.menuUndo = new System.Windows.Forms.MenuItem();
			this.menuRedo = new System.Windows.Forms.MenuItem();
			this.menuItem12 = new System.Windows.Forms.MenuItem();
			this.menuCut = new System.Windows.Forms.MenuItem();
			this.menuCopy = new System.Windows.Forms.MenuItem();
			this.menuView = new System.Windows.Forms.MenuItem();
			this.menuToolbar = new System.Windows.Forms.MenuItem();
			this.menuStatusBar = new System.Windows.Forms.MenuItem();
			this.menuItem24 = new System.Windows.Forms.MenuItem();
			this.menuZoom = new System.Windows.Forms.MenuItem();
			this.menuZoomIn = new System.Windows.Forms.MenuItem();
			this.menuZoomOut = new System.Windows.Forms.MenuItem();
			this.menuResume = new System.Windows.Forms.MenuItem();
			this.menuImgSetting = new System.Windows.Forms.MenuItem();
			this.menuColorSettings = new System.Windows.Forms.MenuItem();
			this.menuHelp = new System.Windows.Forms.MenuItem();
			this.menuHelpIndex = new System.Windows.Forms.MenuItem();
			this.menuAboutGE = new System.Windows.Forms.MenuItem();
			this._menuImages = new Chris.Beckett.MenuImageLib.MenuImage(this.components);
			this.GE_toolBar1 = new System.Windows.Forms.ToolBar();
			this.tlBtnNew = new System.Windows.Forms.ToolBarButton();
			this.tlBtnOpen = new System.Windows.Forms.ToolBarButton();
			this.tlBtnSave = new System.Windows.Forms.ToolBarButton();
			this.sp1 = new System.Windows.Forms.ToolBarButton();
			this.tlBtnSelect = new System.Windows.Forms.ToolBarButton();
			this.tlBtnCopy = new System.Windows.Forms.ToolBarButton();
			this.tlBtnCut = new System.Windows.Forms.ToolBarButton();
			this.sp2 = new System.Windows.Forms.ToolBarButton();
			this.sp5 = new System.Windows.Forms.ToolBarButton();
			this.tlBtnUndo = new System.Windows.Forms.ToolBarButton();
			this.tlBtnRedo = new System.Windows.Forms.ToolBarButton();
			this.tlBtnFont = new System.Windows.Forms.ToolBarButton();
			this.tlBtnColor = new System.Windows.Forms.ToolBarButton();
			this.tlBtnPenWidth = new System.Windows.Forms.ToolBarButton();
			this.muPenWidth = new System.Windows.Forms.ContextMenu();
			this.printDocument1 = new System.Drawing.Printing.PrintDocument();
			this.printPreviewDialog1 = new System.Windows.Forms.PrintPreviewDialog();
			this.pageSetupDialog1 = new System.Windows.Forms.PageSetupDialog();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelTip)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelFont)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelViewScale)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelMousePos)).BeginInit();
			this.SuspendLayout();
			// 
			// GE_toolBar
			// 
			this.GE_toolBar.Buttons.AddRange(new System.Windows.Forms.ToolBarButton[] {
																						  this.tlBtnErase,
																						  this.sep2,
																						  this.tlBtnLine,
																						  this.tlBtnLines,
																						  this.tlBtnFreehand,
																						  this.tlBtnFrameRect,
																						  this.tlBtnFillRect,
																						  this.tlBtnFrameEllipse,
																						  this.tlBtnFillEllipse,
																						  this.tlBtnImage,
																						  this.tlBtnText,
																						  this.sep3,
																						  this.tlBtnZoomIn,
																						  this.tlBtnZoomOut,
																						  this.tlBtnZoomResume,
																						  this.sep4});
			this.GE_toolBar.DropDownArrows = true;
			this.GE_toolBar.ImageList = this.GE_imageList;
			this.GE_toolBar.Location = new System.Drawing.Point(0, 0);
			this.GE_toolBar.Name = "GE_toolBar";
			this.GE_toolBar.ShowToolTips = true;
			this.GE_toolBar.Size = new System.Drawing.Size(591, 28);
			this.GE_toolBar.TabIndex = 0;
			this.GE_toolBar.ButtonClick += new System.Windows.Forms.ToolBarButtonClickEventHandler(this.GE_toolBar_ButtonClick);
			// 
			// tlBtnErase
			// 
			this.tlBtnErase.ImageIndex = 23;
			this.tlBtnErase.ToolTipText = "Erase";
			// 
			// sep2
			// 
			this.sep2.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tlBtnLine
			// 
			this.tlBtnLine.ImageIndex = 6;
			this.tlBtnLine.ToolTipText = "Draw Line";
			// 
			// tlBtnLines
			// 
			this.tlBtnLines.ImageIndex = 19;
			this.tlBtnLines.ToolTipText = "Draw Multiple Lines, double click to stop";
			// 
			// tlBtnFreehand
			// 
			this.tlBtnFreehand.ImageIndex = 32;
			this.tlBtnFreehand.ToolTipText = "Free Hand Drawing";
			// 
			// tlBtnFrameRect
			// 
			this.tlBtnFrameRect.ImageIndex = 4;
			this.tlBtnFrameRect.ToolTipText = "Draw Rectangle";
			// 
			// tlBtnFillRect
			// 
			this.tlBtnFillRect.ImageIndex = 3;
			this.tlBtnFillRect.ToolTipText = "Draw Filled Rectangle";
			// 
			// tlBtnFrameEllipse
			// 
			this.tlBtnFrameEllipse.ImageIndex = 15;
			this.tlBtnFrameEllipse.ToolTipText = "Draw Ellipse";
			// 
			// tlBtnFillEllipse
			// 
			this.tlBtnFillEllipse.ImageIndex = 16;
			this.tlBtnFillEllipse.ToolTipText = "Draw Filled Ellipse";
			// 
			// tlBtnImage
			// 
			this.tlBtnImage.ImageIndex = 17;
			this.tlBtnImage.ToolTipText = "Insert Image";
			// 
			// tlBtnText
			// 
			this.tlBtnText.ImageIndex = 18;
			this.tlBtnText.ToolTipText = "Insert Text";
			// 
			// sep3
			// 
			this.sep3.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tlBtnZoomIn
			// 
			this.tlBtnZoomIn.ImageIndex = 12;
			this.tlBtnZoomIn.ToolTipText = "ZoomIn";
			// 
			// tlBtnZoomOut
			// 
			this.tlBtnZoomOut.ImageIndex = 13;
			this.tlBtnZoomOut.ToolTipText = "ZoomOut";
			// 
			// tlBtnZoomResume
			// 
			this.tlBtnZoomResume.ImageIndex = 14;
			this.tlBtnZoomResume.ToolTipText = "Resume";
			// 
			// sep4
			// 
			this.sep4.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// GE_imageList
			// 
			this.GE_imageList.ImageSize = new System.Drawing.Size(16, 16);
			this.GE_imageList.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("GE_imageList.ImageStream")));
			this.GE_imageList.TransparentColor = System.Drawing.Color.Transparent;
			// 
			// mainView
			// 
			this.mainView.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(0)), ((System.Byte)(192)), ((System.Byte)(192)));
			this.mainView.ContextMenu = this.contextMenu1;
			this.mainView.Dock = System.Windows.Forms.DockStyle.Fill;
			this.mainView.Location = new System.Drawing.Point(0, 56);
			this.mainView.Name = "mainView";
			this.mainView.Size = new System.Drawing.Size(591, 353);
			this.mainView.TabIndex = 3;
			this.mainView.Paint += new System.Windows.Forms.PaintEventHandler(this.mainView_Paint);
			// 
			// contextMenu1
			// 
			this.contextMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																						 this.pasteMenuItem,
																						 this.menuItemCanvasBackColor,
																						 this.menuItemCanvasSize});
			this.contextMenu1.Popup += new System.EventHandler(this.contextMenu1_Popup);
			// 
			// pasteMenuItem
			// 
			this.pasteMenuItem.Index = 0;
			this._menuImages.SetMenuImage(this.pasteMenuItem, null);
			this.pasteMenuItem.OwnerDraw = true;
			this.pasteMenuItem.Text = "Paste";
			this.pasteMenuItem.Click += new System.EventHandler(this.pasteMenuItem_Click);
			// 
			// menuItemCanvasBackColor
			// 
			this.menuItemCanvasBackColor.Index = 1;
			this._menuImages.SetMenuImage(this.menuItemCanvasBackColor, null);
			this.menuItemCanvasBackColor.OwnerDraw = true;
			this.menuItemCanvasBackColor.Text = "CanvasBackColor";
			this.menuItemCanvasBackColor.Click += new System.EventHandler(this.menuItemCanvasBackColor_Click);
			// 
			// menuItemCanvasSize
			// 
			this.menuItemCanvasSize.Index = 2;
			this._menuImages.SetMenuImage(this.menuItemCanvasSize, null);
			this.menuItemCanvasSize.OwnerDraw = true;
			this.menuItemCanvasSize.Text = "CanvasSize";
			this.menuItemCanvasSize.Click += new System.EventHandler(this.menuItemCanvasSize_Click);
			// 
			// GE_statusBar
			// 
			this.GE_statusBar.Location = new System.Drawing.Point(0, 409);
			this.GE_statusBar.Name = "GE_statusBar";
			this.GE_statusBar.Panels.AddRange(new System.Windows.Forms.StatusBarPanel[] {
																							this.sbPanelTip,
																							this.sbPanelFont,
																							this.sbPanelViewScale,
																							this.sbPanelMousePos});
			this.GE_statusBar.ShowPanels = true;
			this.GE_statusBar.Size = new System.Drawing.Size(591, 23);
			this.GE_statusBar.TabIndex = 2;
			// 
			// sbPanelTip
			// 
			this.sbPanelTip.AutoSize = System.Windows.Forms.StatusBarPanelAutoSize.Spring;
			this.sbPanelTip.Width = 265;
			// 
			// sbPanelFont
			// 
			this.sbPanelFont.Width = 150;
			// 
			// sbPanelViewScale
			// 
			this.sbPanelViewScale.Width = 60;
			// 
			// mainMenu1
			// 
			this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menuFile,
																					  this.menuEdit,
																					  this.menuView,
																					  this.menuImgSetting,
																					  this.menuHelp});
			// 
			// menuFile
			// 
			this.menuFile.Index = 0;
			this.menuFile.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.menuNew,
																					 this.menuOpen,
																					 this.menuSave,
																					 this.menuSaveAs,
																					 this.menuItem5,
																					 this.menuPrint,
																					 this.menuPrintPreview,
																					 this.menuPageSetting,
																					 this.menuItem4,
																					 this.menuRecentFiles,
																					 this.menuItem1,
																					 this.menuExit});
			this.menuFile.Text = "File";
			// 
			// menuNew
			// 
			this.menuNew.Index = 0;
			this._menuImages.SetMenuImage(this.menuNew, "36");
			this.menuNew.OwnerDraw = true;
			this.menuNew.Shortcut = System.Windows.Forms.Shortcut.CtrlN;
			this.menuNew.Text = "New";
			this.menuNew.Click += new System.EventHandler(this.menuNew_Click);
			// 
			// menuOpen
			// 
			this.menuOpen.Index = 1;
			this._menuImages.SetMenuImage(this.menuOpen, "33");
			this.menuOpen.OwnerDraw = true;
			this.menuOpen.Shortcut = System.Windows.Forms.Shortcut.CtrlO;
			this.menuOpen.Text = "Open";
			this.menuOpen.Click += new System.EventHandler(this.menuOpen_Click);
			// 
			// menuSave
			// 
			this.menuSave.Index = 2;
			this._menuImages.SetMenuImage(this.menuSave, "35");
			this.menuSave.OwnerDraw = true;
			this.menuSave.Shortcut = System.Windows.Forms.Shortcut.CtrlS;
			this.menuSave.Text = "Save";
			this.menuSave.Click += new System.EventHandler(this.menuSave_Click);
			// 
			// menuSaveAs
			// 
			this.menuSaveAs.Index = 3;
			this._menuImages.SetMenuImage(this.menuSaveAs, "35");
			this.menuSaveAs.OwnerDraw = true;
			this.menuSaveAs.Text = "Save as...";
			this.menuSaveAs.Click += new System.EventHandler(this.menuSaveAs_Click);
			// 
			// menuItem5
			// 
			this.menuItem5.Index = 4;
			this._menuImages.SetMenuImage(this.menuItem5, null);
			this.menuItem5.OwnerDraw = true;
			this.menuItem5.Text = "-";
			// 
			// menuPrint
			// 
			this.menuPrint.Index = 5;
			this._menuImages.SetMenuImage(this.menuPrint, "31");
			this.menuPrint.OwnerDraw = true;
			this.menuPrint.Shortcut = System.Windows.Forms.Shortcut.CtrlP;
			this.menuPrint.Text = "Print";
			this.menuPrint.Click += new System.EventHandler(this.menuPrint_Click);
			// 
			// menuPrintPreview
			// 
			this.menuPrintPreview.Index = 6;
			this._menuImages.SetMenuImage(this.menuPrintPreview, null);
			this.menuPrintPreview.OwnerDraw = true;
			this.menuPrintPreview.Text = "PrintPreview";
			this.menuPrintPreview.Click += new System.EventHandler(this.menuPrintPreview_Click);
			// 
			// menuPageSetting
			// 
			this.menuPageSetting.Index = 7;
			this._menuImages.SetMenuImage(this.menuPageSetting, null);
			this.menuPageSetting.OwnerDraw = true;
			this.menuPageSetting.Text = "PageSetting";
			this.menuPageSetting.Click += new System.EventHandler(this.menuPageSetting_Click);
			// 
			// menuItem4
			// 
			this.menuItem4.Index = 8;
			this._menuImages.SetMenuImage(this.menuItem4, null);
			this.menuItem4.OwnerDraw = true;
			this.menuItem4.Text = "-";
			// 
			// menuRecentFiles
			// 
			this.menuRecentFiles.Index = 9;
			this._menuImages.SetMenuImage(this.menuRecentFiles, null);
			this.menuRecentFiles.OwnerDraw = true;
			this.menuRecentFiles.Text = "Recent Files";
			// 
			// menuItem1
			// 
			this.menuItem1.Index = 10;
			this._menuImages.SetMenuImage(this.menuItem1, null);
			this.menuItem1.OwnerDraw = true;
			this.menuItem1.Text = "-";
			// 
			// menuExit
			// 
			this.menuExit.Index = 11;
			this._menuImages.SetMenuImage(this.menuExit, "34");
			this.menuExit.OwnerDraw = true;
			this.menuExit.Text = "Exit";
			this.menuExit.Click += new System.EventHandler(this.menuExit_Click);
			// 
			// menuEdit
			// 
			this.menuEdit.Index = 1;
			this.menuEdit.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.menuUndo,
																					 this.menuRedo,
																					 this.menuItem12,
																					 this.menuCut,
																					 this.menuCopy});
			this.menuEdit.Text = "Edit";
			// 
			// menuUndo
			// 
			this.menuUndo.Index = 0;
			this._menuImages.SetMenuImage(this.menuUndo, "11");
			this.menuUndo.OwnerDraw = true;
			this.menuUndo.Shortcut = System.Windows.Forms.Shortcut.CtrlZ;
			this.menuUndo.Text = "Undo";
			this.menuUndo.Click += new System.EventHandler(this.menuUndo_Click);
			// 
			// menuRedo
			// 
			this.menuRedo.Index = 1;
			this._menuImages.SetMenuImage(this.menuRedo, "9");
			this.menuRedo.OwnerDraw = true;
			this.menuRedo.Shortcut = System.Windows.Forms.Shortcut.CtrlY;
			this.menuRedo.Text = "Redo";
			this.menuRedo.Click += new System.EventHandler(this.menuRedo_Click);
			// 
			// menuItem12
			// 
			this.menuItem12.Index = 2;
			this._menuImages.SetMenuImage(this.menuItem12, null);
			this.menuItem12.OwnerDraw = true;
			this.menuItem12.Text = "-";
			// 
			// menuCut
			// 
			this.menuCut.Index = 3;
			this._menuImages.SetMenuImage(this.menuCut, "1");
			this.menuCut.OwnerDraw = true;
			this.menuCut.Shortcut = System.Windows.Forms.Shortcut.CtrlX;
			this.menuCut.Text = "Cut";
			this.menuCut.Click += new System.EventHandler(this.menuCut_Click);
			// 
			// menuCopy
			// 
			this.menuCopy.Index = 4;
			this._menuImages.SetMenuImage(this.menuCopy, "0");
			this.menuCopy.OwnerDraw = true;
			this.menuCopy.Shortcut = System.Windows.Forms.Shortcut.CtrlC;
			this.menuCopy.Text = "Copy";
			this.menuCopy.Click += new System.EventHandler(this.menuCopy_Click);
			// 
			// menuView
			// 
			this.menuView.Index = 2;
			this.menuView.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.menuToolbar,
																					 this.menuStatusBar,
																					 this.menuItem24,
																					 this.menuZoom,
																					 this.menuResume});
			this.menuView.Text = "View";
			this.menuView.Popup += new System.EventHandler(this.menuView_Popup);
			// 
			// menuToolbar
			// 
			this.menuToolbar.Index = 0;
			this._menuImages.SetMenuImage(this.menuToolbar, null);
			this.menuToolbar.OwnerDraw = true;
			this.menuToolbar.Text = "Toolbar";
			this.menuToolbar.Click += new System.EventHandler(this.menuToolbar_Click_1);
			// 
			// menuStatusBar
			// 
			this.menuStatusBar.Checked = true;
			this.menuStatusBar.Index = 1;
			this._menuImages.SetMenuImage(this.menuStatusBar, null);
			this.menuStatusBar.OwnerDraw = true;
			this.menuStatusBar.Text = "Status Bar";
			this.menuStatusBar.Click += new System.EventHandler(this.menuStatusBar_Click);
			// 
			// menuItem24
			// 
			this.menuItem24.Index = 2;
			this._menuImages.SetMenuImage(this.menuItem24, null);
			this.menuItem24.OwnerDraw = true;
			this.menuItem24.Text = "-";
			// 
			// menuZoom
			// 
			this.menuZoom.Index = 3;
			this._menuImages.SetMenuImage(this.menuZoom, null);
			this.menuZoom.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.menuZoomIn,
																					 this.menuZoomOut});
			this.menuZoom.OwnerDraw = true;
			this.menuZoom.Text = "Zoom";
			// 
			// menuZoomIn
			// 
			this.menuZoomIn.Index = 0;
			this._menuImages.SetMenuImage(this.menuZoomIn, "12");
			this.menuZoomIn.OwnerDraw = true;
			this.menuZoomIn.Text = "Zoom In";
			this.menuZoomIn.Click += new System.EventHandler(this.menuZoomIn_Click);
			// 
			// menuZoomOut
			// 
			this.menuZoomOut.Index = 1;
			this._menuImages.SetMenuImage(this.menuZoomOut, "13");
			this.menuZoomOut.OwnerDraw = true;
			this.menuZoomOut.Text = "Zoom Out";
			this.menuZoomOut.Click += new System.EventHandler(this.menuZoomOut_Click);
			// 
			// menuResume
			// 
			this.menuResume.Index = 4;
			this._menuImages.SetMenuImage(this.menuResume, "14");
			this.menuResume.OwnerDraw = true;
			this.menuResume.Text = "Resume";
			this.menuResume.Click += new System.EventHandler(this.menuResume_Click);
			// 
			// menuImgSetting
			// 
			this.menuImgSetting.Index = 3;
			this.menuImgSetting.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																						   this.menuColorSettings});
			this.menuImgSetting.Text = "Image Settings";
			// 
			// menuColorSettings
			// 
			this.menuColorSettings.Index = 0;
			this._menuImages.SetMenuImage(this.menuColorSettings, "27");
			this.menuColorSettings.OwnerDraw = true;
			this.menuColorSettings.Text = "Color Settings";
			this.menuColorSettings.Click += new System.EventHandler(this.menuColorSettings_Click);
			// 
			// menuHelp
			// 
			this.menuHelp.Index = 4;
			this.menuHelp.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.menuHelpIndex,
																					 this.menuAboutGE});
			this.menuHelp.Text = "Help";
			// 
			// menuHelpIndex
			// 
			this.menuHelpIndex.Index = 0;
			this._menuImages.SetMenuImage(this.menuHelpIndex, "29");
			this.menuHelpIndex.OwnerDraw = true;
			this.menuHelpIndex.Shortcut = System.Windows.Forms.Shortcut.F1;
			this.menuHelpIndex.Text = "Help Index";
			this.menuHelpIndex.Click += new System.EventHandler(this.menuHelpIndex_Click);
			// 
			// menuAboutGE
			// 
			this.menuAboutGE.Index = 1;
			this._menuImages.SetMenuImage(this.menuAboutGE, "30");
			this.menuAboutGE.OwnerDraw = true;
			this.menuAboutGE.Text = "About Graphical Editor";
			this.menuAboutGE.Click += new System.EventHandler(this.menuAboutGE_Click);
			// 
			// _menuImages
			// 
			this._menuImages.ImageList = this.GE_imageList;
			// 
			// GE_toolBar1
			// 
			this.GE_toolBar1.AutoSize = false;
			this.GE_toolBar1.Buttons.AddRange(new System.Windows.Forms.ToolBarButton[] {
																						   this.tlBtnNew,
																						   this.tlBtnOpen,
																						   this.tlBtnSave,
																						   this.sp1,
																						   this.tlBtnSelect,
																						   this.tlBtnCopy,
																						   this.tlBtnCut,
																						   this.sp2,
																						   this.sp5,
																						   this.tlBtnUndo,
																						   this.tlBtnRedo,
																						   this.tlBtnFont,
																						   this.tlBtnColor,
																						   this.tlBtnPenWidth});
			this.GE_toolBar1.DropDownArrows = true;
			this.GE_toolBar1.ImageList = this.GE_imageList;
			this.GE_toolBar1.Location = new System.Drawing.Point(0, 28);
			this.GE_toolBar1.Name = "GE_toolBar1";
			this.GE_toolBar1.ShowToolTips = true;
			this.GE_toolBar1.Size = new System.Drawing.Size(591, 28);
			this.GE_toolBar1.TabIndex = 4;
			this.GE_toolBar1.ButtonClick += new System.Windows.Forms.ToolBarButtonClickEventHandler(this.GE_toolBar1_ButtonClick);
			// 
			// tlBtnNew
			// 
			this.tlBtnNew.ImageIndex = 36;
			this.tlBtnNew.ToolTipText = "New";
			// 
			// tlBtnOpen
			// 
			this.tlBtnOpen.ImageIndex = 33;
			this.tlBtnOpen.ToolTipText = "Open";
			// 
			// tlBtnSave
			// 
			this.tlBtnSave.ImageIndex = 35;
			this.tlBtnSave.ToolTipText = "Save";
			// 
			// sp1
			// 
			this.sp1.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tlBtnSelect
			// 
			this.tlBtnSelect.ImageIndex = 10;
			this.tlBtnSelect.ToolTipText = "Select";
			// 
			// tlBtnCopy
			// 
			this.tlBtnCopy.ImageIndex = 0;
			this.tlBtnCopy.ToolTipText = "Copy";
			// 
			// tlBtnCut
			// 
			this.tlBtnCut.ImageIndex = 1;
			this.tlBtnCut.ToolTipText = "Cut";
			// 
			// sp2
			// 
			this.sp2.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// sp5
			// 
			this.sp5.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;
			// 
			// tlBtnUndo
			// 
			this.tlBtnUndo.ImageIndex = 11;
			this.tlBtnUndo.ToolTipText = "Undo";
			// 
			// tlBtnRedo
			// 
			this.tlBtnRedo.ImageIndex = 9;
			this.tlBtnRedo.ToolTipText = "Redo";
			// 
			// tlBtnFont
			// 
			this.tlBtnFont.ImageIndex = 25;
			this.tlBtnFont.ToolTipText = "Font";
			// 
			// tlBtnColor
			// 
			this.tlBtnColor.ImageIndex = 24;
			this.tlBtnColor.ToolTipText = "Color";
			// 
			// tlBtnPenWidth
			// 
			this.tlBtnPenWidth.DropDownMenu = this.muPenWidth;
			this.tlBtnPenWidth.ImageIndex = 37;
			this.tlBtnPenWidth.Style = System.Windows.Forms.ToolBarButtonStyle.DropDownButton;
			this.tlBtnPenWidth.ToolTipText = "Line Width ";
			// 
			// printDocument1
			// 
			this.printDocument1.OriginAtMargins = true;
			this.printDocument1.BeginPrint += new System.Drawing.Printing.PrintEventHandler(this.printDocument1_BeginPrint);
			this.printDocument1.EndPrint += new System.Drawing.Printing.PrintEventHandler(this.printDocument1_EndPrint);
			this.printDocument1.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.printDocument1_PrintPage);
			// 
			// printPreviewDialog1
			// 
			this.printPreviewDialog1.AutoScrollMargin = new System.Drawing.Size(0, 0);
			this.printPreviewDialog1.AutoScrollMinSize = new System.Drawing.Size(0, 0);
			this.printPreviewDialog1.ClientSize = new System.Drawing.Size(400, 300);
			this.printPreviewDialog1.Document = this.printDocument1;
			this.printPreviewDialog1.Enabled = true;
			this.printPreviewDialog1.Icon = ((System.Drawing.Icon)(resources.GetObject("printPreviewDialog1.Icon")));
			this.printPreviewDialog1.Location = new System.Drawing.Point(22, 22);
			this.printPreviewDialog1.MinimumSize = new System.Drawing.Size(375, 250);
			this.printPreviewDialog1.Name = "printPreviewDialog1";
			this.printPreviewDialog1.TransparencyKey = System.Drawing.Color.Empty;
			this.printPreviewDialog1.Visible = false;
			this.printPreviewDialog1.Paint += new System.Windows.Forms.PaintEventHandler(this.printPreviewDialog1_Paint);
			// 
			// pageSetupDialog1
			// 
			this.pageSetupDialog1.Document = this.printDocument1;
			this.pageSetupDialog1.MinMargins = new System.Drawing.Printing.Margins(0, 20, 0, 20);
			// 
			// GE
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(591, 432);
			this.Controls.Add(this.mainView);
			this.Controls.Add(this.GE_toolBar1);
			this.Controls.Add(this.GE_statusBar);
			this.Controls.Add(this.GE_toolBar);
			this.Menu = this.mainMenu1;
			this.Name = "GE";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "Graphic Editor";
			this.WindowState = System.Windows.Forms.FormWindowState.Maximized;
			this.Closing += new System.ComponentModel.CancelEventHandler(this.GE_Closing);
			this.Load += new System.EventHandler(this.GE_Load);
			((System.ComponentModel.ISupportInitialize)(this.sbPanelTip)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelFont)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelViewScale)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.sbPanelMousePos)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

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

	
		/// <summary>
		/// Initial draw tool types
		/// </summary>
		private void InitGraDrawTool() 
		{
			//Get the instance of GraDrawToolMgr
			GraDrawToolMgr drawToolMgr = GraDrawToolMgr.Instance;

			

            //Add Select draw tool type into GraDrawToolMgr
			SelectDrawTool selectTool = SelectDrawTool.Instance;
			selectTool.TblBtn = this.tlBtnSelect;
			selectTool.StateChanged +=new EventHandler(selectTool_StateChanged);
			this.selectTool_StateChanged(selectTool,EventArgs.Empty);
			GraDrawToolMgr.Instance.AddDrawTool(selectTool);

			//Add line draw tool type into GraDrawToolMgr
			LineDrawTool lineTool = new LineDrawTool();
			lineTool.TblBtn = this.tlBtnLine;
			GraDrawToolMgr.Instance.AddDrawTool(lineTool);

			//Add lines draw tool type into GraDrawToolMgr
			LinesDrawTool linesTool = new LinesDrawTool();
			linesTool.TblBtn = this.tlBtnLines;
			GraDrawToolMgr.Instance.AddDrawTool(linesTool);

			//Add freehand draw tool type into GraDrawToolMgr
			FreehandDrawTool freehandTool = new FreehandDrawTool();
			freehandTool.TblBtn = this.tlBtnFreehand;
			GraDrawToolMgr.Instance.AddDrawTool(freehandTool);

			//Add erase draw tool type into GraDrawToolMgr
			EraseDrawTool eraseTool = new EraseDrawTool();
			eraseTool.TblBtn = this.tlBtnErase;
			GraDrawToolMgr.Instance.AddDrawTool(eraseTool);

			//Add frame rectangle draw tool type into GraDrawToolMgr
			FrameRectDrawTool frameRectTool = new FrameRectDrawTool();
			frameRectTool.TblBtn = this.tlBtnFrameRect;
			GraDrawToolMgr.Instance.AddDrawTool(frameRectTool);

			//Add solid rectangle draw tool type into GraDrawToolMgr
			FillRectDrawTool fillRectTool = new FillRectDrawTool();
			fillRectTool.TblBtn = this.tlBtnFillRect;
			GraDrawToolMgr.Instance.AddDrawTool(fillRectTool);

			//Add frame ellipse draw tool type into GraDrawToolMgr
			FrameEllipseDrawTool frameEllipseTool = new FrameEllipseDrawTool();
			frameEllipseTool.TblBtn = this.tlBtnFrameEllipse;
			GraDrawToolMgr.Instance.AddDrawTool(frameEllipseTool);

			//Add solid ellipse draw tool type into GraDrawToolMgr
			FillEllipseDrawTool fillEllipseTool = new FillEllipseDrawTool();
			fillEllipseTool.TblBtn = this.tlBtnFillEllipse;
			GraDrawToolMgr.Instance.AddDrawTool(fillEllipseTool);

			//Add insert image draw tool type into GraDrawToolMgr
			ImageDrawTool imageDrawTool = new ImageDrawTool();
			imageDrawTool.TblBtn = this.tlBtnImage;
			GraDrawToolMgr.Instance.AddDrawTool(imageDrawTool);

			//Add insert text draw tool type into GraDrawToolMgr
			TextDrawTool textDrawTool = TextDrawTool.Instance;
			textDrawTool.TblBtn = this.tlBtnText;
			GraDrawToolMgr.Instance.AddDrawTool(textDrawTool);

		}

		private void GE_toolBar_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)//Toolbar button click events
		{
			
			ToolBarButton b = e.Button;//clicked Toolbar button 

			if(b != this.tlBtnText)
				TextDrawTool.Instance.EndTextEditing(true);
			
			if(b == this.tlBtnLine)//Line button is clicked
				tlBtnLine_Click();
			else if(b == this.tlBtnLines)//Lines button is clicked
				tlBtnLines_Click();
		    else if(b == this.tlBtnFreehand)//Freehand button is clicked
				tlBtnFreehand_Click();
			else if(b == this.tlBtnFrameRect)//Frame rectangle button is clicked
				tlBtnFrameRect_Click();
			else if(b == this.tlBtnFillRect)//Solid rectangle button is clicked
				tlBtnFillRect_Click();
			else if(b == this.tlBtnFrameEllipse)//Frame ellipse button is clicked
				tlBtnFrameEllipse_Click();
			else if(b == this.tlBtnFillEllipse)//Solid ellipse button is clicked
				tlBtnFillEllipse_Click();
			else if(b == this.tlBtnZoomIn)//Zoom in button is clicked
				tlBtnZoomIn_Click();
			else if(b == this.tlBtnZoomOut)//Zoom out button is clicked
				tlBtnZoomOut_Click();
			else if(b == this.tlBtnZoomResume)//Zoom resume button is clicked
				tlBtnZoomResume_Click();
			else if(b == this.tlBtnImage)//Zoom resume button is clicked
				tlBtnImage_Click();
			else if(b == this.tlBtnText)//Zoom resume button is clicked
				tlBtnText_Click();
			else if(b == this.tlBtnErase) // erase button is clicked
				tlBtnErase_Click();
			
		}

		private  void tlBtnFont_Click()
		{
			FontDialog  dlg = new FontDialog(); //instantiating a new fontdialog box
			dlg.Font = DrawEnvMgr.Instance.Font;
			if(DialogResult.OK == dlg.ShowDialog(this))
			{
				DrawEnvMgr.Instance.Font = dlg.Font; // assigning the font selected by the user to DrawEnvMgr.Instance.Font 

				UpdateFontPanel();
			}
		}

		private  void UpdateFontPanel()
		{
			Font f = DrawEnvMgr.Instance.Font;
			string  info = string.Format("{0} -- {1}",f.Name,f.Size);
			this.sbPanelFont.Text = info;
		}

		private  MenuItem  selectedPenWidthMenuItem;
		private void  InitPenWidthToolBarButton()
		{
			MenuItem[] items = new MenuItem[16];//6
			for(int i=0; i< items.Length; i++)
			{
				items[i] = new MenuItem(i.ToString());//
				items[i].MeasureItem += new MeasureItemEventHandler(GE_MeasureItem);
				items[i].DrawItem +=new DrawItemEventHandler(PenWidthMenu_DrawItem);
				items[i].Click +=new EventHandler(PenWidthMenu_Click);

				items[i].OwnerDraw = true;

			}
			this.muPenWidth.MenuItems.AddRange(items);
			this.selectedPenWidthMenuItem = items[0];
			this.selectedPenWidthMenuItem.Checked = true;
		}

		private void GE_MeasureItem(object sender, MeasureItemEventArgs e)
		{
			e.ItemHeight = 20;
			e.ItemWidth = 80;//(int)stringSize.Width;
		}
		/// <summary>
		/// OwnerDraw PenWidth toolBar button menu
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		private void PenWidthMenu_DrawItem(object sender, DrawItemEventArgs e)
		{
			Point pt1 = new Point(e.Bounds.X+6,e.Bounds.Y+e.Bounds.Height/2);
			Point pt2 = new Point(e.Bounds.Right-6,pt1.Y);
			MenuItem item = sender as MenuItem;
			using(Pen p = new Pen(Color.Black,item.Index+1))
			{
				e.Graphics.DrawLine(p,pt1,pt2);
			}

			if(item.Checked)
			{
				Rectangle r = e.Bounds;
				r.Inflate(-4,0);
				e.Graphics.DrawRectangle(Pens.Red,r);
				
			}
		}

		private void PenWidthMenu_Click(object sender, EventArgs e)
		{
			MenuItem item = sender as MenuItem;
			if(item == this.selectedPenWidthMenuItem)
				return;
			this.selectedPenWidthMenuItem.Checked = false;
			this.selectedPenWidthMenuItem = item;
			this.selectedPenWidthMenuItem.Checked = true;
			DrawEnvMgr.Instance.PenWidth = item.Index +1;
		}
		
		//Assigns an image to the button from the image list
		private  void  UpdateColorBtnImage(Color color)
		{
			int imageIndex = tlBtnColor.ImageIndex;
			Image image = this.GE_imageList.Images[imageIndex];
			using(Graphics g = Graphics.FromImage(image))
			{
				using(SolidBrush b = new SolidBrush(color))
				{
					g.FillRectangle(b,new Rectangle(2,11,12,4));
				}
			}

			this.GE_imageList.Images[imageIndex]=image;

			tlBtnColor.ImageIndex = 0;
			tlBtnColor.ImageIndex = imageIndex;
		}
		
		// Shows the color dialog box and gets the color selection of the user
		private  void tlBtnColor_Click()
		{
			ColorDialog  dlg = new ColorDialog(); // instantiating new color dialog box 
			dlg.Color = DrawEnvMgr.Instance.Color; //assigning the DrawEnvMgr.Instance.Color to the dialog
			if(DialogResult.OK == dlg.ShowDialog())
			{
				DrawEnvMgr.Instance.Color = dlg.Color;

				UpdateColorBtnImage(dlg.Color); //updating the image with the color selected by user in the dialog box
			}
		}


		// select button is clicked
		private void tlBtnSelect_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Select);//Set SelectDrawTool as active 
		}

		// line button is clicked
		private void tlBtnLine_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Line);//Set LineDrawTool as active 
		}

		// lines button is clicked
		private void tlBtnLines_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Lines);//Set LineDrawTool as active 
		}

		// freehand button is clicked
		private void tlBtnFreehand_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Freehand);//Set FreehandDrawTool as active 
		}
		// erase button is clicked
		private void tlBtnErase_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Erase);//Set SelectDrawTool as active 
		}

		// frame rectangle button is clicked
		private void tlBtnFrameRect_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.FrameRect);//Set FrameRectDrawTool as active 

		}

        // solid button is clicked
		private void tlBtnFillRect_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.FillRect);//Set FillRectDrawTool as active 

		}

		// frame ellipse button is clicked
		private void tlBtnFrameEllipse_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.FrameEllipse);//Set FrameEllipseDrawTool as active 

		}

		// solid ellipse button is clicked
		private void tlBtnFillEllipse_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.FillEllipse);//Set FillEllipseDrawTool as active 

		}
		
		// sets the insert image as the active tool
		private void tlBtnImage_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Image);//Set FillEllipseDrawTool as active 
		}
		
		// sets the insert text as the active tool
		private void tlBtnText_Click()
		{
			GraDrawToolMgr.Instance.SetActiveTool(GraDrawType.Text);//Set FillEllipseDrawTool as active 

		}

		// cut button is clicked
		private  void tlBtnCut_Click( )
		{
			SelectDrawTool.Instance.Cut();//cut operation

		}

		// move button is clicked
		private  void tlBtnMove_Click( )
		{
			// to be added
		}

		
		
		// zoom in button is clicked
		private void tlBtnZoomIn_Click()
		{
			this.mainView.ScaleView(1.2f);//Zoom in 1.2 times
			OnViewZoomChanged();
		}

		// zoom out button is clicked
		private void tlBtnZoomOut_Click()
		{
			this.mainView.ScaleView(0.8f);//Zoom out 0.8 time
			OnViewZoomChanged();
			
		}

		private void OnViewZoomChanged()
		{
			float scale = this.mainView.ViewMatrix.Elements[0];
			string text = scale.ToString("p0");
			this.sbPanelViewScale.Text = text;
		}

		// zoom resume button is clicked
		private void tlBtnZoomResume_Click()
		{
			this.mainView.ResetScale();//Resume to original size
			OnViewZoomChanged();
		}

		// copy button is clicked
		private  void tlBtnCopy_Click( )
		{
			SelectDrawTool.Instance.Copy();
		}

		// paste button is clicked
//		private  void tlBtnPaste_Click( )
//		{
//
//		}

		// undo button is clicked
		private  void tlBtnUndo_Click( )
		{
			GraEditStackMgr.Instance.Undo();//Undo operation
			if(Canvas.Instance.GraList.Count == 0)
			{
				this.tlBtnUndo.Enabled = false;
				this.menuUndo.Enabled = false;
			}

			if(GraEditStackMgr.Instance.GraRedoList.Count > 0)
			{
				this.tlBtnRedo.Enabled = true;
				this.menuRedo.Enabled = true;
			}
		}

		// redo button is clicked
		private  void tlBtnRedo_Click( )
		{
			GraEditStackMgr.Instance.Redo();//Redo operation
			if(GraEditStackMgr.Instance.GraRedoList.Count == 0)
			{
				this.tlBtnRedo.Enabled = false;
				this.menuRedo.Enabled = false;
			}

			if(Canvas.Instance.GraList.Count > 0)
			{
				this.tlBtnUndo.Enabled = true;
				this.menuUndo.Enabled = true;
			}
		}

		private void  InitEditStackMgr()
		{
			this.tlBtnUndo.Enabled = false;
			this.tlBtnRedo.Enabled = false;
			this.menuRedo.Enabled = false;
			this.menuUndo.Enabled = false;

			GraEditStackMgr.Instance.Clear();

			GraDrawTool tool = GraDrawToolMgr.Instance.ActiveDrawTool;
			if(tool != null)
				tool.IsActive = false;

		}

		// new file button is clicked
		private void tlBtnNew_Click()
		{
			if(!this.SaveFile(true))
				return;

			Canvas.Instance.Close();

			NewCanvasCfg dlg = new NewCanvasCfg();
			dlg.Text ="Create New Canvas";
			if(DialogResult.OK != dlg.ShowDialog())
				return;

			SelectDrawTool.Instance.IsActive = false;

			Canvas.Instance.Init(null,dlg.CanvasSize,dlg.CanvasBackColor);
			InitEditStackMgr();
			Canvas.Instance.Update();
		}

		// open file button is clicked
		private void tlBtnOpen_Click()
		{
			if(!Canvas.Instance.Open())
				return;

			SelectDrawTool.Instance.IsActive = false;
			InitEditStackMgr();

			
		}

		

		// save file button is clicked
		private void tlBtnSave_Click()
		{
			
			this.SaveFile(false);

		}


		private  bool  SaveFile(bool  isNeedWarning)
		{
			if(!Canvas.Instance.IsModified)
				return true;

			if(isNeedWarning)
			{
				DialogResult r = MessageBox.Show(this,"The file has been modified,do you need save it?","Warning",
					MessageBoxButtons.YesNoCancel);

				if( r == DialogResult.Cancel)
					return false;

				if(r == DialogResult.No)
					return true;
			}

			SaveFileDialog dlg = new SaveFileDialog();
			dlg.Filter = this.fileFilter;
			dlg.RestoreDirectory = true ;

			if(Canvas.Instance.Name == null ||
				Canvas.Instance.Name.Length == 0)
			{

				dlg.FilterIndex = 1 ;

				if(dlg.ShowDialog() == DialogResult.OK)
				{
					Canvas.Instance.Name = dlg.FileName;
					this.recentFilesMgr.FilesList.Insert(0,Canvas.Instance.Name);
				}
				else
					return false;
			}
			else if(!Canvas.Instance.IsSavedOnce)
			{
				dlg.FileName = Canvas.Instance.Name;
				dlg.FilterIndex = GetFilterIndexByFileName(dlg.FileName);
				if(dlg.ShowDialog() == DialogResult.OK)
				{
					Canvas.Instance.Name = dlg.FileName;
					this.recentFilesMgr.FilesList.Insert(0,Canvas.Instance.Name);
				}
				else
					return false;
			}

			Canvas.Instance.Save();

			return true;
		}

		
		private  string  fileFilter ="Bitmap files (*.bmp)|*.bmp|Jpg files (*.jpg)|*.jpg|Gif files (*.gif)|*.gif" ;
		private  int GetFilterIndexByFileName(string fileName)
		{
			string ext = Path.GetExtension(fileName);
			if(ext == ".bmp")
				return 1;
			else if(ext ==".jpg")
				return 2;
			else if(ext ==".5gif")
				return 3;
			else
				return 1;
		}

		
		// pop-up menu is clicked
		private void pasteMenuItem_Click(object sender, System.EventArgs e)
		{
			
			//Console.WriteLine("{0} {1}",pt.X,pt.Y);
			SelectDrawTool.Instance.Paste();//paste operation
		}


		//Pop-up menu
		private void contextMenu1_Popup(object sender, System.EventArgs e)
		{
			this.mainView.contextMenu1_Popup(sender,e);//Get the click item in pop-up menu
//			Point pt = Cursor.Position;
//			pt = this.PointToClient(pt);
//			SelectDrawTool.Instance.ContextMenuMousePos = pt;
		}

		
//Main menu items
		//Exit
		private void menuExit_Click(object sender, System.EventArgs e)
		{
			//Application.Exit();
			this.Close();
		}
 
		//Undo
		private void menuUndo_Click(object sender, System.EventArgs e)
		{
		this.tlBtnUndo_Click();
		}

		//Open
		private void menuOpen_Click(object sender, System.EventArgs e) 
		{
			this.tlBtnOpen_Click();
		}

		//New
		private void menuNew_Click(object sender, System.EventArgs e)
		{
			this.tlBtnNew_Click();
		}

		//Save as
		private void menuSaveAs_Click(object sender, System.EventArgs e)
		{
			SaveFileDialog dlg = new SaveFileDialog();
			dlg.Filter = this.fileFilter;
			//dlg.FilterIndex = 1 ;
			dlg.RestoreDirectory = true ;

			dlg.FileName = Canvas.Instance.Name;
			dlg.FilterIndex = GetFilterIndexByFileName(dlg.FileName);
			if(dlg.ShowDialog() == DialogResult.OK)
			{
				Canvas.Instance.Name = dlg.FileName;
				this.recentFilesMgr.FilesList.Insert(0,Canvas.Instance.Name);
				Canvas.Instance.Save();
			}
			
			
		}

		//Save
		private void menuSave_Click(object sender, System.EventArgs e)
		{
		  this.tlBtnSave_Click();
		}

		//Redo
		private void menuRedo_Click(object sender, System.EventArgs e)
		{
			this.tlBtnRedo_Click();
		}

		//Copy
		private void menuCopy_Click(object sender, System.EventArgs e)
		{
			this.tlBtnCopy_Click();
		}

		//Cut
		private void menuCut_Click(object sender, System.EventArgs e)
		{
			this.tlBtnCut_Click();
		}
       // Paste
		private void menuPaste_Click(object sender, System.EventArgs e)
		{
//			this.tlBtnPaste_Click();
		}
		
		// Zoom In
		private void menuZoomIn_Click(object sender, System.EventArgs e)
		{
			this.tlBtnZoomIn_Click();
		}

		//ZoomOut
		private void menuZoomOut_Click(object sender, System.EventArgs e)
		{
			this.tlBtnZoomOut_Click();
		}

		//Resume
		private void menuResume_Click(object sender, System.EventArgs e)
		{
			this.tlBtnZoomResume_Click();
		}

		// Assigns the pen width to the DrawEnvMgr.Instance.PenWidth from the selection in the combo box
//		private void cboPenWidth_SelectedIndexChanged(object sender, EventArgs e)
//		{
//			int penWidth = (int)this.cboPenWidth.SelectedItem;
//			DrawEnvMgr.Instance.PenWidth = penWidth;
//		}

		//Gets the background color for the image from the user using Color DialogBox
		private void menuItemCanvasBackColor_Click(object sender, System.EventArgs e)
		{
			ColorDialog dlg = new ColorDialog();
			dlg.Color = Canvas.Instance.BackColor;
			if(DialogResult.OK == dlg.ShowDialog())
			{
				
				foreach(GraElement gra in Canvas.Instance.GraList)
				{
					if(gra is EraseLinesGra)
					{
						gra.PenExt.Color = dlg.Color;
					}

					if(gra is EraseRectGra)
					{
						gra.PenExt.Color = dlg.Color;
						gra.BrushExt.Color = dlg.Color;
					}
				}

				Canvas.Instance.BackColor = dlg.Color;
			}
		}

		// Shows the help Dialog box
//		private void menuHelp_Click(object sender, System.EventArgs e)
//		{
//			
//
//		}

		

		private void GE_toolBar1_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
		{
			ToolBarButton b = e.Button;//clicked Toolbar button
			
			if(b != this.tlBtnText)
				TextDrawTool.Instance.EndTextEditing(true);

			if(b == this.tlBtnNew) // new image button is clicked
				tlBtnNew_Click();
			else if(b == this.tlBtnOpen) // open an existing image button is clicked
				tlBtnOpen_Click();
			else if(b == this.tlBtnSave) // save the current image button is clicked
				tlBtnSave_Click();
			else if(b == this.tlBtnUndo)//Undo button is clicked
				tlBtnUndo_Click();
			else if(b == this.tlBtnRedo)//Redo button is clicked
				tlBtnRedo_Click();
			else if(b == this.tlBtnColor)
				tlBtnColor_Click();
			else if(b == this.tlBtnFont)
				tlBtnFont_Click();
			else if(b == this.tlBtnCut)//Cut button is clicked
				tlBtnCut_Click( );
				//			else if(b == this.tlBtnMove)//Move button is clicked
				//				tlBtnMove_Click( );
			else if(b == this.tlBtnCopy)//Copy button is clicked
				tlBtnCopy_Click( );
				//			else if(b == this.tlBtnPaste)//Paste button is clicked
				//				tlBtnPaste_Click( );
			
			else if(b == this.tlBtnSelect)//Select button is clicked
				tlBtnSelect_Click();

		}

		private void menuView_Popup(object sender, System.EventArgs e)
		{
			menuToolbar.MenuItems.Clear();
			foreach (Control c in _toolBarManager.GetControls())
			{
				ToolBarDockHolder holder = _toolBarManager.GetHolder(c);
				MenuItem mi = new MenuItem(holder.ToolbarTitle, new EventHandler(this.menuToolbar_Click));
				mi.Checked = holder.Visible;
				menuToolbar.MenuItems.Add(mi);
			}
		}
		

		private void GE_Load(object sender, System.EventArgs e)
		{
		
		}

		private void menuToolbar_Click(object sender, System.EventArgs e)
		{
			MenuItem mi = sender as MenuItem;
			ToolBarDockHolder holder = _toolBarManager.GetHolder(mi.Text);
			_toolBarManager.ShowControl(holder.Control, !holder.Control.Visible);
		}

		private void menuColorToolbox_Click(object sender, System.EventArgs e)
		{
		  tlBtnColor_Click();
		}

		private void menuColorSettings_Click(object sender, System.EventArgs e)
		{
		  tlBtnColor_Click();
		}

		private void menuToolbar_Click_1(object sender, System.EventArgs e)
		{
			MenuItem mi = sender as MenuItem;
			ToolBarDockHolder holder = _toolBarManager.GetHolder(mi.Text);
			_toolBarManager.ShowControl(holder.Control, !holder.Control.Visible);
		}

		private void menuAboutGE_Click(object sender, System.EventArgs e)
		{
			AboutDialog dlg = new AboutDialog();
			dlg.ShowDialog();
		}

		private void printPreviewDialog1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			
	
		}

		private void menuPrintPreview_Click(object sender, System.EventArgs e)
		{
			this.printPreviewDialog1.ShowDialog();
		}

		private void printDocument1_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
		{
		
		}

		private void printDocument1_EndPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
		{
		
		}

		private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
		{
			//e.p
			try
			{
			
				Graphics g = e.Graphics;
				Region r = new Region(new Rectangle(new Point(0,0),Canvas.Instance.Size));
				Region old = g.Clip;
				g.Clip = r;
				ArrayList list = Canvas.Instance.GraList;
				foreach(GraElement gra in list)
				{
					if(gra is EraseLinesGra)
					{
						gra.PenExt.Color = Color.White;
						gra.Draw(g);
						gra.PenExt.Color = Canvas.Instance.BackColor;
					}
					else if(gra is EraseRectGra)
					{
						gra.PenExt.Color = Color.White;
						gra.BrushExt.Color = Color.White;
						gra.Draw(g);
						gra.PenExt.Color = Canvas.Instance.BackColor;
						gra.BrushExt.Color = Canvas.Instance.BackColor;


					}
					else
						gra.Draw(g);
				}

				g.Clip = old;
			}
			catch(Exception ex) 
			{
				MessageBox.Show("Error when print document - " + ex.Message);
			}

		}

		private void menuPageSetting_Click(object sender, System.EventArgs e)
		{
			try 
			{
	
				this.pageSetupDialog1.ShowDialog();

			} 
			catch(Exception ex) 
			{
				MessageBox.Show("Error - " + ex.Message);
			}

			
		}

		private void menuItem2_Click(object sender, System.EventArgs e)
		{
		
		}

		private  RecentFilesMgr   recentFilesMgr;

		private  void  InitRecentFilesMgr()
		{
			string  path = Application.StartupPath;
			string  logFileName = path +"/RecentFiles.txt";

			this.recentFilesMgr = new RecentFilesMgr(logFileName);

			this.recentFilesMgr.ReadRecentFiles();

			if(this.recentFilesMgr.FilesList.Count == 0)
				return;

			MenuItem[] items = new MenuItem[this.recentFilesMgr.FilesList.Count];
			for(int i=0; i< items.Length; i++)
			{
				items[i] = new MenuItem(this.recentFilesMgr.FilesList[i] as string);
				items[i].Click +=new EventHandler(RecentFileMenuItem_Click);

			}

			this.menuRecentFiles.MenuItems.AddRange(items);

			
		}

		private  void RecentFileMenuItem_Click(object sender, EventArgs e)
		{
			MenuItem item = sender as MenuItem;
			if(!Canvas.Instance.OpenFile(item.Text))
				return;

			InitEditStackMgr();
		}

		private void GE_Closing(object sender, System.ComponentModel.CancelEventArgs e)
		{
			DialogResult r = MessageBox.Show(this,"Do you want exit?","Warning",MessageBoxButtons.OKCancel);
			if(r == DialogResult.Cancel)
			{
				e.Cancel = true;
				return;
			}

			this.tlBtnSave_Click();
			Canvas.Instance.Close();
			this.recentFilesMgr.SaveRecentFiles();

		}

		private void menuStatusBar_Click(object sender, System.EventArgs e)
		{
			MenuItem item = sender as MenuItem;
			item.Checked = !item.Checked;
			this.GE_statusBar.Visible = item.Checked;
		}

		private  class   RecentFilesMgr
		{
			public RecentFilesMgr(string  logFileName)
			{
				this.filesList = new ArrayList();
				this.logFileName = logFileName;
			}

			private  ArrayList   filesList;
			public  ArrayList    FilesList
			{
				get { return filesList; }
			}

			private string  logFileName;
			

			public   void ReadRecentFiles()
			{
				FileInfo  fi = new FileInfo(logFileName);
				if(!fi.Exists)
					return;
				StreamReader s = fi.OpenText();
				string line = null;

				while(( line = s.ReadLine()) != null)
				{
					FileInfo f = new FileInfo(line);
					if(!f.Exists)
						continue;
	
					filesList.Add(line);

					if(filesList.Count == 10)
						break;
				}
				
			}

			public   void SaveRecentFiles( )
			{
				using (StreamWriter sw = new StreamWriter(this.logFileName,false)) 
				{

					foreach(string line in this.filesList)
					{
						sw.WriteLine(line);
					}

				}

				
			}
		}

		private void GraDrawTool_ActiveStateChanged(object sender, EventArgs e)
		{
			GraDrawTool drawTool = sender as GraDrawTool;
			this.sbPanelTip.Text = drawTool.Tip;
		}

		private void mainView_MouseMove(object sender, MouseEventArgs e)
		{
			Point pos = new Point(e.X,e.Y);//Temporary end point
			pos = GraDrawTool.GetRoundPoint(pos);//Round the end point. The min mouse movement distance is 6.
			string text =string.Format("X= {0} Y= {1}",pos.X,pos.Y);
			this.sbPanelMousePos.Text = text;


		}

		private void canvas_Modified(object sender, EventArgs e)
		{
			Canvas c = Canvas.Instance;
			string title = "Graphic Editor -- ";
			if(c.Name != null && c.Name.Length >0)
				title += c.Name;
			else
				title += "Unnamed.bmp";

			if(c.IsModified)
				title +="*";

			this.Text = title;

			if(Canvas.Instance.GraList.Count > 0)
			{
				this.tlBtnUndo.Enabled = true;
				this.menuUndo.Enabled = true;
			}
		}

		private void selectTool_StateChanged(object sender, EventArgs e)
		{
			SelectDrawTool tool = sender as SelectDrawTool;
			if(tool.SelectRectGra != null)
			{
				this.tlBtnCut.Enabled = true;
				this.tlBtnCopy.Enabled = true;
				this.menuCopy.Enabled = true;
				this.menuCut.Enabled = true;
			}
			else
			{
				this.tlBtnCut.Enabled = false;
				this.tlBtnCopy.Enabled = false;
				this.menuCopy.Enabled = false;
				this.menuCut.Enabled = false;
			}

			if(tool.CopyImage != null)
			{
				this.pasteMenuItem.Enabled = true;
				//this.menuPaste.Enabled = true;
			}
			else
			{
				this.pasteMenuItem.Enabled = false;
				//this.menuPaste.Enabled = false;
			}
		}

		private void menuItemCanvasSize_Click(object sender, System.EventArgs e)
		{
			NewCanvasCfg dlg = new NewCanvasCfg();
			dlg.Text ="Change Canvas Size";
			dlg.CanvasSize = Canvas.Instance.Size;
			if(DialogResult.OK == dlg.ShowDialog())
			{
				Canvas.Instance.Size = dlg.CanvasSize;
				Canvas.Instance.Update();
			}
		}

		private void menuPrint_Click(object sender, System.EventArgs e)
		{
			try
			{
				this.printDocument1.Print();
			}
			catch(Exception ex) 
			{
				MessageBox.Show("Print file error - " + ex.Message);
			}
		}

		private void menuHelpIndex_Click(object sender, System.EventArgs e)
		{
			try
			{
				string s = Application.ExecutablePath;
				s = s.Replace("GE.exe","help.chm");
				Process.Start(s);
			}
			catch(Exception e1)
			{
				MessageBox.Show(e1.Message);
			}

			

		}

		private void mainView_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
		
		}
	}

	/// <summary>
	/// All the drawing in Graphical Editor is done on the canvas.
	/// Canvas class is used to define the drawing area.
	/// </summary>
	public  class  Canvas 
	{
		//Construct graList to save the drawing actions
		protected Canvas()
		{
			this.graList = new ArrayList(); // define an arraylist with name gralist for saving all the drawing actions

		}

		//Initialize the canvas. Set name,size and background color of canvas
		public void Init(string name, Size size,Color backColor)
			
		{
			this.name = name;//Set name of canvas
			this.Size = size;//Set size of canvas
			this.backColor = backColor;//Set background color of canvas

			this.graList.Clear();//Clear all the elements in graList

			//this.mainView.AutoScrollMinSize = this.Size;//this.Size;//Set the size of mainView as canvas size

		

			this.isSavedOnce = false;
			this.IsModified = false;
	
		}

		private static  Canvas  _single;
		public  static  Canvas  Instance
		{
			//Get canvas instance
			get               
			{
				if( _single == null)
					_single = new Canvas();

				return _single;
			}
		}

		public event EventHandler   Modified;
		protected void  OnModified()
		{
			if(Modified != null)
				Modified(this,EventArgs.Empty);
		}

		//Dirty flag
		private  bool  isModified;
		public   bool  IsModified
		{
			get { return this.isModified; }
			set 
			{ 
				this.isModified = value; 
				OnModified();
			}
		}

		private  bool  isSavedOnce;
		public   bool  IsSavedOnce
		{
			get { return this.isSavedOnce; }
			set { this.isSavedOnce = value;}
		}

		private  MainView  mainView;//private Mainview variable of canvas
		public   MainView  MainView
		{
			get { return mainView; }
			set { mainView = value;}
		}

		
		
		public void Update()//Refresh canvas
		{
			this.mainView.UpdateView();
		}

		private string name;//canvas name
		public  string Name
		{
			get { return name; }
			set { name = value; }
		}

		private Size size;//canvas size
		public  Size Size
		{
			get { return size; } 
			set 
			{
				size = value; 
				this.mainView.AutoScrollMinSize = this.size;//this.Size;//Set the size of mainView as canvas size

			}
		}

		private Color  backColor;//canvas color i.e. background color of the image
		public  Color  BackColor
		{
			get { return backColor; } 
			set 
			{
				backColor = value; 
				this.Update();
			}
		}

		private  ArrayList  graList;//Save drawing action on canvas
		public   ArrayList  GraList
		{
			get { return graList; }
		}

		public  void AddGra(GraElement gra)
		{
			this.graList.Add(gra);
			this.IsModified = true;
			this.Update();
		}

		public void DelGra(GraElement gra)
		{
			this.graList.Remove(gra);
			this.IsModified = true;
			this.Update();
		}

		//Draw function of canvas
		public  void Draw(Graphics g)
		{
			foreach(GraElement gra in graList)//Draw all the element in the graList
				gra.Draw(g);
		}

		public  bool  Open()
		{
			OpenFileDialog dlg = new OpenFileDialog(); // new open dialog box is instantiated
			dlg.Filter = "Image files (*.bmp;*.jpg;*.gif)|*.bmp;*.jpg;*.gif" ;
			dlg.FilterIndex = 1 ;
			dlg.RestoreDirectory = true ;

			bool bRtn = false;
			if(dlg.ShowDialog() == DialogResult.OK)
			{
				try
				{
				  bRtn = this.OpenFile(dlg.FileName);
				}
				catch(Exception ex) 
				{
					MessageBox.Show("Open file error - " + ex.Message);
				}
			}

			return bRtn;
		}

		private  FileStream   canvasStream;

		public  bool OpenFile(string fileName)
		{
			FileInfo fi = new FileInfo(fileName);
			if(!fi.Exists)
			{
				MessageBox.Show("Can't find this file!","Open File");
				return false;
			}
			
			try
			{
				canvasStream = File.Open(fileName,FileMode.Open,FileAccess.ReadWrite,FileShare.None);
			}
			catch(Exception ex)
			{
				MessageBox.Show("Open File Error - " + ex.Message);

			}

			Bitmap bmp = new Bitmap(canvasStream);
			//fs.Close();
			if(bmp != null)
			{
				Canvas.Instance.Init(fileName,bmp.Size,Color.White);

				ImageGra imageGra = new ImageGra(bmp,new Rectangle(new Point(0,0),bmp.Size));
				Canvas.Instance.GraList.Add(imageGra);//Add to GraList
				Canvas.Instance.Update();//Update canvas

			}

			return true;
		}

		private   ImageFormat  GetImageFormatByFileName(string fileName)
		{
			string ext = Path.GetExtension(fileName);
			ImageFormat format = ImageFormat.Bmp;
			switch(ext)
			{
				case ".jpg":
					format =ImageFormat.Jpeg;
					break;
				case ".gif":
					format = ImageFormat.Gif;
					break;
				default:
					format = ImageFormat.Bmp;
					break;
			}

			return format;
		}


		public   void Save()
		{
			//if(this.canvasStream == null)
			//	return;

			if(this.name == null ||
				this.name.Length == 0)
			{
				MessageBox.Show("Invalid file name!","Warning");
				return;
			}

			Size s = Canvas.Instance.Size;
			Bitmap bmp = new Bitmap(s.Width,s.Height);
			Graphics gBmp = Graphics.FromImage(bmp);
			gBmp.Clear(Canvas.Instance.BackColor);
			this.Draw(gBmp);

			try
			{
				if(this.canvasStream != null)
					this.canvasStream.Close();
				ImageFormat format = GetImageFormatByFileName(Canvas.Instance.Name);
				bmp.Save(Canvas.Instance.Name,format);
				bmp.Dispose();
				this.IsModified = false;
				this.IsSavedOnce = true;

				this.canvasStream = File.Open(this.name,FileMode.Open,FileAccess.ReadWrite,FileShare.None);
			}
			catch(Exception ex) 
			{
				MessageBox.Show("Save file error - " + ex.Message);
			}

			
		}


		public  bool Close()
		{
			if(canvasStream != null)
			{
				canvasStream.Close();
				canvasStream = null;
			}

			return true;
		}
	}


	//Redo & Undo operation
	public class  GraEditStackMgr
	{
		
		private GraEditStackMgr()//construct a redo list
		{
			this.graRedoList = new ArrayList();
		}

		private static  GraEditStackMgr  instance;
		public static  GraEditStackMgr   Instance
		{
			get                     
			{
				if(instance == null)
					instance = new GraEditStackMgr();
				return instance;
			}
		}

		private ArrayList  graRedoList;//Redo list
		public  ArrayList  GraRedoList
		{
			get { return graRedoList;}
		}

		public void Clear()
		{
			this.graRedoList.Clear();
		}

		//Redo operation
		public void  Redo()
		{
			if(this.graRedoList.Count == 0)//no undo happen
				return;

			int lastIndex = this.graRedoList.Count -1;//Get the last undo action

			//Save last undo action to graLast
			GraElement graLast = this.graRedoList[lastIndex] as GraElement;
			this.graRedoList.RemoveAt(lastIndex);//Remove the last undo action from redo list

			//Canvas.Instance.GraList.Add(graLast);//Save the last undo action to GraList
			//Canvas.Instance.Update();//Update canvas
			Canvas.Instance.AddGra(graLast);

		}

		//Undo operation
		public void Undo()
		{
			ArrayList graList = Canvas.Instance.GraList;//Get the GraList of Canvas
			if(graList.Count == 0)//No drawing action happen
				return;

			int lastIndex = graList.Count -1;//Last drawing action position in graList
			
			//Save the last drawing action to graLast
			GraElement graLast = graList[lastIndex] as GraElement;
			graList.RemoveAt(lastIndex);//Remove the last drawing action 
			this.graRedoList.Add(graLast);//Add the last drawing action to redo list

			Canvas.Instance.Update();//Update canvas
			Canvas.Instance.IsModified = true;
		}

		
	}
}