C# 绘图板（绘图工具实例源码）

【实例简介】c#版绘图工具

【实例截图】

【核心代码】

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

using Painter.Common;


namespace Painter
{
	/// <summary>
	/// PaintForm 的摘要说明。
	/// </summary>
	public class PaintForm : System.Windows.Forms.Form
	{
		#region Windows组件定义
		private System.Windows.Forms.MainMenu mainMenu;
		private System.Windows.Forms.PictureBox myPicture;
		private System.Windows.Forms.StatusBar myStatusBar;
		private System.Windows.Forms.ToolBar MainToolBar;
		private System.Windows.Forms.ToolBarButton tbb_Line;
		private System.Windows.Forms.ToolBarButton tbb_Rect;
		private System.Windows.Forms.ToolBarButton tbb_Circle;
		private System.Windows.Forms.ToolBarButton tbb_Cursor;
		private System.Windows.Forms.StatusBarPanel sbp_Info;
		private System.Windows.Forms.StatusBarPanel sbp_Coord;
		private System.Windows.Forms.MenuItem menu_File;
		private System.Windows.Forms.MenuItem menu_FileNew;
		private System.Windows.Forms.MenuItem menu_FileOpen;
		private System.Windows.Forms.MenuItem menu_FileSave;
		private System.Windows.Forms.MenuItem menu_FileSaveAs;
		private System.Windows.Forms.MenuItem menuItem8;
		private System.Windows.Forms.MenuItem menu_FileExit;
		private System.Windows.Forms.MenuItem menu_Edit;
		private System.Windows.Forms.MenuItem menu_EditSize;
		private System.Windows.Forms.MenuItem menuItem1;
		private System.Windows.Forms.MenuItem menu_Help;
		private System.Windows.Forms.MenuItem menu_EditSelAll;
		private System.Windows.Forms.MenuItem menu_HelpAbout;
		private System.Windows.Forms.Panel myPanel;
		private System.Windows.Forms.MenuItem menu_EditClear;
		private System.Windows.Forms.OpenFileDialog openFileDialog1;
		private System.Windows.Forms.SaveFileDialog saveFileDialog1;
		private System.Windows.Forms.ColorDialog colorDialog1;
		private System.Windows.Forms.MenuItem menuItem2;
		private System.Windows.Forms.MenuItem menu_EditPenColor;
		private System.Windows.Forms.MenuItem menu_EditPenWidth;
		private System.Windows.Forms.MenuItem menu_EditPenStyle;
		#endregion
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;
		private ArrayList Items;
		private ClickState CursorState = ClickState.Free;
		private int ptx_old,pty_old,ptx_new,pty_new,ptx_start,pty_start;
		private int movex_old,movey_old,movex_new,movey_new,movex_start,movey_start;
		private Color pencolor;
		private float penwidth;
		private System.Drawing.Drawing2D.DashStyle penstyle;
		private bool IsSaved = false;
		private string FileName,ImgFileName;
		private int imgWidth = 800,imgHeight  = 600;
		private System.Windows.Forms.MenuItem menu_EditDelItem;

		public PaintForm()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();
			Items = new ArrayList();
			ptx_old = ptx_new = pty_old = pty_new = ptx_start = pty_start = 0;
			movex_old = movex_new = movey_old = movey_new = movex_start = movey_start = 0;
			pencolor = Color.Black;
			penstyle = DashStyle.Solid;
			penwidth = 1;
			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		#region 设计器自动生成代码
		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}
		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new PaintForm());
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.mainMenu = new System.Windows.Forms.MainMenu();
			this.menu_File = new System.Windows.Forms.MenuItem();
			this.menu_FileNew = new System.Windows.Forms.MenuItem();
			this.menu_FileOpen = new System.Windows.Forms.MenuItem();
			this.menu_FileSave = new System.Windows.Forms.MenuItem();
			this.menu_FileSaveAs = new System.Windows.Forms.MenuItem();
			this.menuItem8 = new System.Windows.Forms.MenuItem();
			this.menu_FileExit = new System.Windows.Forms.MenuItem();
			this.menu_Edit = new System.Windows.Forms.MenuItem();
			this.menu_EditSize = new System.Windows.Forms.MenuItem();
			this.menuItem2 = new System.Windows.Forms.MenuItem();
			this.menu_EditPenColor = new System.Windows.Forms.MenuItem();
			this.menu_EditPenWidth = new System.Windows.Forms.MenuItem();
			this.menu_EditPenStyle = new System.Windows.Forms.MenuItem();
			this.menuItem1 = new System.Windows.Forms.MenuItem();
			this.menu_EditClear = new System.Windows.Forms.MenuItem();
			this.menu_EditSelAll = new System.Windows.Forms.MenuItem();
			this.menu_Help = new System.Windows.Forms.MenuItem();
			this.menu_HelpAbout = new System.Windows.Forms.MenuItem();
			this.myPicture = new System.Windows.Forms.PictureBox();
			this.MainToolBar = new System.Windows.Forms.ToolBar();
			this.tbb_Cursor = new System.Windows.Forms.ToolBarButton();
			this.tbb_Line = new System.Windows.Forms.ToolBarButton();
			this.tbb_Rect = new System.Windows.Forms.ToolBarButton();
			this.tbb_Circle = new System.Windows.Forms.ToolBarButton();
			this.myStatusBar = new System.Windows.Forms.StatusBar();
			this.sbp_Info = new System.Windows.Forms.StatusBarPanel();
			this.sbp_Coord = new System.Windows.Forms.StatusBarPanel();
			this.myPanel = new System.Windows.Forms.Panel();
			this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
			this.saveFileDialog1 = new System.Windows.Forms.SaveFileDialog();
			this.colorDialog1 = new System.Windows.Forms.ColorDialog();
			this.menu_EditDelItem = new System.Windows.Forms.MenuItem();
			((System.ComponentModel.ISupportInitialize)(this.sbp_Info)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.sbp_Coord)).BeginInit();
			this.myPanel.SuspendLayout();
			this.SuspendLayout();
			// 
			// mainMenu
			// 
			this.mainMenu.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					 this.menu_File,
																					 this.menu_Edit,
																					 this.menu_Help});
			// 
			// menu_File
			// 
			this.menu_File.Index = 0;
			this.menu_File.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menu_FileNew,
																					  this.menu_FileOpen,
																					  this.menu_FileSave,
																					  this.menu_FileSaveAs,
																					  this.menuItem8,
																					  this.menu_FileExit});
			this.menu_File.Text = "文件(&F)";
			// 
			// menu_FileNew
			// 
			this.menu_FileNew.Index = 0;
			this.menu_FileNew.Shortcut = System.Windows.Forms.Shortcut.CtrlN;
			this.menu_FileNew.Text = "新建";
			this.menu_FileNew.Click  = new System.EventHandler(this.menu_FileNew_Click);
			// 
			// menu_FileOpen
			// 
			this.menu_FileOpen.Index = 1;
			this.menu_FileOpen.Shortcut = System.Windows.Forms.Shortcut.CtrlO;
			this.menu_FileOpen.Text = "打开";
			this.menu_FileOpen.Click  = new System.EventHandler(this.menu_FileOpen_Click);
			// 
			// menu_FileSave
			// 
			this.menu_FileSave.Index = 2;
			this.menu_FileSave.Shortcut = System.Windows.Forms.Shortcut.CtrlS;
			this.menu_FileSave.Text = "保存";
			this.menu_FileSave.Click  = new System.EventHandler(this.menu_FileSave_Click);
			// 
			// menu_FileSaveAs
			// 
			this.menu_FileSaveAs.Index = 3;
			this.menu_FileSaveAs.Text = "另存为...";
			this.menu_FileSaveAs.Click  = new System.EventHandler(this.menu_FileSaveAs_Click);
			// 
			// menuItem8
			// 
			this.menuItem8.Index = 4;
			this.menuItem8.Text = "-";
			// 
			// menu_FileExit
			// 
			this.menu_FileExit.Index = 5;
			this.menu_FileExit.Text = "退出(&X)";
			this.menu_FileExit.Click  = new System.EventHandler(this.menu_FileExit_Click);
			// 
			// menu_Edit
			// 
			this.menu_Edit.Index = 1;
			this.menu_Edit.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menu_EditSize,
																					  this.menuItem2,
																					  this.menu_EditPenColor,
																					  this.menu_EditPenWidth,
																					  this.menu_EditPenStyle,
																					  this.menuItem1,
																					  this.menu_EditDelItem,
																					  this.menu_EditClear,
																					  this.menu_EditSelAll});
			this.menu_Edit.Text = "编辑(&E)";
			// 
			// menu_EditSize
			// 
			this.menu_EditSize.Index = 0;
			this.menu_EditSize.Text = "图像大小";
			this.menu_EditSize.Click  = new System.EventHandler(this.menu_EditSize_Click);
			// 
			// menuItem2
			// 
			this.menuItem2.Index = 1;
			this.menuItem2.Text = "-";
			// 
			// menu_EditPenColor
			// 
			this.menu_EditPenColor.Index = 2;
			this.menu_EditPenColor.Text = "选取画笔颜色";
			this.menu_EditPenColor.Click  = new System.EventHandler(this.menu_PenColor_Click);
			// 
			// menu_EditPenWidth
			// 
			this.menu_EditPenWidth.Index = 3;
			this.menu_EditPenWidth.Text = "选取画笔粗度";
			this.menu_EditPenWidth.Click  = new System.EventHandler(this.menu_PenWidth_Click);
			// 
			// menu_EditPenStyle
			// 
			this.menu_EditPenStyle.Index = 4;
			this.menu_EditPenStyle.Text = "选取画笔样式";
			this.menu_EditPenStyle.Click  = new System.EventHandler(this.menu_PenStyle_Click);
			// 
			// menuItem1
			// 
			this.menuItem1.Index = 5;
			this.menuItem1.Text = "-";
			// 
			// menu_EditClear
			// 
			this.menu_EditClear.Index = 7;
			this.menu_EditClear.Text = "清除";
			this.menu_EditClear.Click  = new System.EventHandler(this.menu_EditClear_Click);
			// 
			// menu_EditSelAll
			// 
			this.menu_EditSelAll.Index = 8;
			this.menu_EditSelAll.Shortcut = System.Windows.Forms.Shortcut.CtrlA;
			this.menu_EditSelAll.Text = "全选";
			this.menu_EditSelAll.Click  = new System.EventHandler(this.menu_EditSelAll_Click);
			// 
			// menu_Help
			// 
			this.menu_Help.Index = 2;
			this.menu_Help.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
																					  this.menu_HelpAbout});
			this.menu_Help.Text = "帮助(&H)";
			// 
			// menu_HelpAbout
			// 
			this.menu_HelpAbout.Index = 0;
			this.menu_HelpAbout.Text = "关于";
			this.menu_HelpAbout.Click  = new System.EventHandler(this.menu_HelpAbout_Click);
			// 
			// myPicture
			// 
			this.myPicture.Location = new System.Drawing.Point(8, 16);
			this.myPicture.Name = "myPicture";
			this.myPicture.Size = new System.Drawing.Size(488, 184);
			this.myPicture.TabIndex = 0;
			this.myPicture.TabStop = false;
			this.myPicture.Click  = new System.EventHandler(this.myPicture_Click);
			this.myPicture.Paint  = new System.Windows.Forms.PaintEventHandler(this.myPicture_Paint);
			this.myPicture.MouseUp  = new System.Windows.Forms.MouseEventHandler(this.myPicture_MouseUp);
			this.myPicture.MouseMove  = new System.Windows.Forms.MouseEventHandler(this.myPicture_MouseMove);
			this.myPicture.MouseDown  = new System.Windows.Forms.MouseEventHandler(this.myPicture_MouseDown);
			// 
			// MainToolBar
			// 
			this.MainToolBar.Buttons.AddRange(new System.Windows.Forms.ToolBarButton[] {
																						   this.tbb_Cursor,
																						   this.tbb_Line,
																						   this.tbb_Rect,
																						   this.tbb_Circle});
			this.MainToolBar.ButtonSize = new System.Drawing.Size(75, 22);
			this.MainToolBar.DropDownArrows = true;
			this.MainToolBar.Location = new System.Drawing.Point(0, 0);
			this.MainToolBar.Name = "MainToolBar";
			this.MainToolBar.ShowToolTips = true;
			this.MainToolBar.Size = new System.Drawing.Size(520, 28);
			this.MainToolBar.TabIndex = 1;
			this.MainToolBar.TextAlign = System.Windows.Forms.ToolBarTextAlign.Right;
			this.MainToolBar.ButtonClick  = new System.Windows.Forms.ToolBarButtonClickEventHandler(this.MainToolBar_ButtonClick);
			// 
			// tbb_Cursor
			// 
			this.tbb_Cursor.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbb_Cursor.Text = "指针";
			// 
			// tbb_Line
			// 
			this.tbb_Line.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbb_Line.Text = "直线";
			// 
			// tbb_Rect
			// 
			this.tbb_Rect.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbb_Rect.Text = "矩形";
			// 
			// tbb_Circle
			// 
			this.tbb_Circle.Style = System.Windows.Forms.ToolBarButtonStyle.ToggleButton;
			this.tbb_Circle.Text = "圆形";
			// 
			// myStatusBar
			// 
			this.myStatusBar.Location = new System.Drawing.Point(0, 251);
			this.myStatusBar.Name = "myStatusBar";
			this.myStatusBar.Panels.AddRange(new System.Windows.Forms.StatusBarPanel[] {
																						   this.sbp_Info,
																						   this.sbp_Coord});
			this.myStatusBar.ShowPanels = true;
			this.myStatusBar.Size = new System.Drawing.Size(520, 22);
			this.myStatusBar.TabIndex = 2;
			// 
			// sbp_Info
			// 
			this.sbp_Info.AutoSize = System.Windows.Forms.StatusBarPanelAutoSize.Spring;
			this.sbp_Info.Width = 404;
			// 
			// myPanel
			// 
			this.myPanel.AutoScroll = true;
			this.myPanel.Controls.Add(this.myPicture);
			this.myPanel.Location = new System.Drawing.Point(0, 32);
			this.myPanel.Name = "myPanel";
			this.myPanel.Size = new System.Drawing.Size(512, 216);
			this.myPanel.TabIndex = 3;
			// 
			// openFileDialog1
			// 
			this.openFileDialog1.DefaultExt = "*.pat";
			this.openFileDialog1.Filter = "Painter文件|*.pat|BMP文件|*.bmp|JPG文件|*.jpg|JPEG文件|*.jpeg|Gif文件|*.gif";
			// 
			// saveFileDialog1
			// 
			this.saveFileDialog1.DefaultExt = "*.pat";
			this.saveFileDialog1.Filter = "Painter文件|*.pat|BMP文件|*.bmp|JPG文件|*.jpg|JPEG文件|*.jpeg|Gif文件|*.gif";
			// 
			// menu_EditDelItem
			// 
			this.menu_EditDelItem.Index = 6;
			this.menu_EditDelItem.Text = "删除元素";
			this.menu_EditDelItem.Click  = new System.EventHandler(this.menu_EditDelItem_Click);
			// 
			// PaintForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(520, 273);
			this.Controls.Add(this.myPanel);
			this.Controls.Add(this.myStatusBar);
			this.Controls.Add(this.MainToolBar);
			this.Menu = this.mainMenu;
			this.Name = "PaintForm";
			this.Text = "绘图板";
			this.SizeChanged  = new System.EventHandler(this.PaintForm_SizeChanged);
			this.Load  = new System.EventHandler(this.PaintForm_Load);
			this.Paint  = new System.Windows.Forms.PaintEventHandler(this.PaintForm_Paint);
			((System.ComponentModel.ISupportInitialize)(this.sbp_Info)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.sbp_Coord)).EndInit();
			this.myPanel.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion
		#endregion
		#region 窗体事件响应
		private void PaintForm_Load(object sender, System.EventArgs e)
		{
			ResizeControls();
			this.myPicture.BackColor = Color.White;
			this.tbb_Cursor.Pushed = true;
			this.myPicture.Width = imgWidth;
			this.myPicture.Height = imgHeight;
			this.IsSaved = false;
		}
		private void PaintForm_SizeChanged(object sender, System.EventArgs e)
		{
			ResizeControls();
		}

		private void MainToolBar_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
		{
			if (e.Button.Pushed) 
			{
				foreach (ToolBarButton btn in MainToolBar.Buttons) 
				{
					if (btn.Pushed && !btn.Equals(e.Button)) 
					{
						btn.Pushed = false;
					}
				}
			}
			if (e.Button.Equals(tbb_Cursor)) 
			{
				this.myPicture.Cursor = Cursors.Arrow;
			}
			else
			{
				this.myPicture.Cursor = Cursors.Cross;
			}
		}

		private void PaintForm_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			PaintItems();
		}
		private void myPicture_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			PaintItems();
		}
		#endregion
		#region 鼠标事件响应
		private void myPicture_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if (this.tbb_Cursor.Pushed) 
			{
				Point pt = myPicture.PointToClient(Cursor.Position);
				movex_start = movex_old = movex_new = pt.X;
				movey_start = movey_old = movey_new = pt.Y;
				if (e.Button==MouseButtons.Right && CursorState == ClickState.Free) 
				{
					CursorState = ClickState.MoveBusy;
				}
				else if (e.Button==MouseButtons.Left && CursorState==ClickState.MoveBusy) 
				{
					CursorState = ClickState.RotateBusy;
				}
			}
		}
		private void myPicture_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			Point pt = Cursor.Position;
			pt = this.myPicture.PointToClient(pt);
			this.sbp_Coord.Text = string.Format("({0},{1})",pt.X,pt.Y);	
			// 如果需要移动图形，则开始绘制
			if (this.tbb_Cursor.Pushed && CursorState == ClickState.MoveBusy) {
                movex_old = movex_new;
				movey_old = movey_new;
				movex_new = pt.X;
				movey_new = pt.Y;

				Graphics g = myPicture.CreateGraphics();
				// 移动选中的Item
				foreach (object obj in Items) 
				{
					MyItem item = obj as MyItem;
					if (item != null && item.IsSelected) 
					{
						item.Move(g,movex_new-movex_old,movey_new-movey_old,
							myPicture.BackColor);
					}					
				}
				PaintItems();
				return;
			}
			//如果需要旋转图形，则开始绘制
			if (this.tbb_Cursor.Pushed && CursorState == ClickState.RotateBusy) 
			{
				movex_old = movex_new;
				movey_old = movey_new;
				movex_new = pt.X;
				movey_new = pt.Y;

				Graphics g = myPicture.CreateGraphics();
				// 移动选中的Item
				foreach (object obj in Items) 
				{
					MyItem item = obj as MyItem;
					if (item != null && item.IsSelected) 
					{
						item.Rotate(g,movex_new,movey_new,myPicture.BackColor);
					}					
				}
				PaintItems();
				return;
			}
			// 如果已经开始图形的绘制，则绘制图形
			if (CursorState == ClickState.DrawBusy) 
			{
				ptx_old = ptx_new;
				pty_old = pty_new;
				ptx_new = pt.X;
				pty_new = pt.Y;

				if (this.tbb_Line.Pushed) 
				{
					Pen pen = new Pen(myPicture.BackColor,penwidth);
					pen.DashStyle = penstyle;
					Graphics g = myPicture.CreateGraphics();
					g.DrawLine(pen,ptx_start,pty_start,ptx_old,pty_old);
					pen.Color = pencolor;
					g.DrawLine(pen,ptx_start,pty_start,ptx_new,pty_new);
				}
				else if (this.tbb_Rect.Pushed) 
				{
					Pen pen = new Pen(myPicture.BackColor,penwidth);
					pen.DashStyle = penstyle;
					Graphics g = myPicture.CreateGraphics();
					g.DrawRectangle(pen,ptx_start,pty_start,
						ptx_old-ptx_start,pty_old-pty_start);
					pen.Color = pencolor;
					g.DrawRectangle(pen,ptx_start,pty_start,
                        ptx_new-ptx_start,pty_new-pty_start);
				}
				else if (this.tbb_Circle.Pushed) 
				{
					Pen pen = new Pen(myPicture.BackColor,penwidth);
					pen.DashStyle = penstyle;
					Graphics g = myPicture.CreateGraphics();
					g.DrawEllipse(pen,ptx_start,pty_start,
						ptx_old-ptx_start,ptx_old-ptx_start);
					pen.Color = pencolor;
					g.DrawEllipse(pen,ptx_start,pty_start,
						ptx_new-ptx_start,ptx_new-ptx_start);
				}
				PaintItems();
			}
		}
		private void myPicture_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if (e.Button == MouseButtons.Right) {
				CursorState = ClickState.Free;
			}
		}
		private void myPicture_Click(object sender, System.EventArgs e)
		{	
			if (this.tbb_Cursor.Pushed) 
			{
				if (CursorState == ClickState.Free ||
					CursorState == ClickState.MoveBusy) 
				{
					Point pt = this.myPicture.PointToClient(Cursor.Position);
					bool HasSelected = false;
					// 点击选择一个Item
					foreach(object obj in this.Items) {
						MyItem item = obj as MyItem;
						if (item != null) {
							if (item.Contains(pt.X,pt.Y)) {
								item.Select(myPicture.CreateGraphics(),
									myPicture.BackColor);
								HasSelected = true;
								break;
							}
						}
					}
					if (!HasSelected) {
						foreach (object obj in this.Items) {
							MyItem item = obj as MyItem;
							if (item != null) {
								item.DeSelect(myPicture.CreateGraphics(),
									myPicture.BackColor);
							}
						
						}
					}
				}
			}
			else if (this.tbb_Line.Pushed) 
			{
				if (CursorState == ClickState.Free) 
				{
					CursorState = ClickState.DrawBusy;
					this.myPicture.Capture = true;
					Point pt = myPicture.PointToClient(Cursor.Position);
					ptx_start = ptx_old = ptx_new = pt.X;
					pty_start = pty_old = pty_new = pt.Y;
				}
				else
				{
					CursorState = ClickState.Free;
					this.myPicture.Capture = false;
					Point pt = myPicture.PointToClient(Cursor.Position);
					ptx_new = pt.X;
					pty_new = pt.Y;
					MyItem item = ItemFactory.CreateItem(ItemType.Line,
						ptx_start,pty_start,ptx_new,pty_new,pencolor,penwidth,penstyle);
					Items.Add(item);
				}
			}
			else if (this.tbb_Rect.Pushed) 
			{
				if (CursorState == ClickState.Free) 
				{
					CursorState = ClickState.DrawBusy;
					this.myPicture.Capture = true;
					Point pt = myPicture.PointToClient(Cursor.Position);
					ptx_start = ptx_old = ptx_new = pt.X;
					pty_start = pty_old = pty_new = pt.Y;
				}
				else
				{
					CursorState = ClickState.Free;
					this.myPicture.Capture = false;
					Point pt = myPicture.PointToClient(Cursor.Position);
					ptx_new = pt.X;
					pty_new = pt.Y;
					MyItem item = ItemFactory.CreateItem(ItemType.RectAngle,
						ptx_start,pty_start,ptx_new,pty_new,pencolor,penwidth,penstyle);
					Items.Add(item);
				}
			}
			else if (this.tbb_Circle.Pushed) 
			{
				if (CursorState == ClickState.Free) 
				{
					CursorState = ClickState.DrawBusy;
					this.myPicture.Capture = true;
					Point pt = myPicture.PointToClient(Cursor.Position);
					ptx_start = ptx_old = ptx_new = pt.X;
					pty_start = pty_old = pty_new = pt.Y;
				}
				else
				{
					CursorState = ClickState.Free;
					this.myPicture.Capture = false;
					Point pt = myPicture.PointToClient(Cursor.Position);
					ptx_new = pt.X;
					pty_new = pt.Y;
					MyItem item = ItemFactory.CreateItem(ItemType.Circle,
						ptx_start,pty_start,
						ptx_new,pty_start ptx_new-ptx_start,
						pencolor,penwidth,penstyle);
					Items.Add(item);
				}
			}
		}
		#endregion
		#region 菜单事件响应

		private void menu_FileNew_Click(object sender, System.EventArgs e)
		{
			NewPaint pt = new NewPaint();
			pt.ShowDialog(this);
			this.myPicture.Width = pt.ImageWidth;
			this.myPicture.Height = pt.ImageHeight;
			imgWidth = pt.ImageWidth;
			imgHeight = pt.ImageHeight;
			this.Items.Clear();
			this.myPicture.Invalidate();
			this.IsSaved = false;
		}

		private void menu_FileOpen_Click(object sender, System.EventArgs e)
		{
			if (this.openFileDialog1.ShowDialog(this) == DialogResult.OK) 
			{
				FileName = openFileDialog1.FileName;
				FileInfo finfo = new FileInfo(FileName);

				if (finfo.Extension == ".pat") 
				{
					System.Runtime.Serialization.IFormatter format =
						new System.Runtime.Serialization.
						Formatters.Binary.BinaryFormatter();
					FileStream fs = finfo.Open(FileMode.OpenOrCreate,
						FileAccess.ReadWrite,FileShare.ReadWrite);
					this.Items.Clear();
					Items = format.Deserialize(fs) as ArrayList;
					fs.Close();
					PaintItems();
				}
				else
				{

					ImgFileName = openFileDialog1.FileName;
					Image img = Image.FromFile(ImgFileName);
					this.myPicture.Width = img.Width;
					this.myPicture.Height = img.Height;
					this.myPicture.CreateGraphics().DrawImageUnscaled(
						img,0,0);
				}
			}
		}

		private void menu_FileSave_Click(object sender, System.EventArgs e)
		{
			if (!IsSaved) 
			{
				if (this.saveFileDialog1.ShowDialog(this) == DialogResult.OK) 
				{
					SaveFile();
				}
			}
			else
			{
			}
		}
		private void menu_FileSaveAs_Click(object sender, System.EventArgs e)
		{
			if (this.saveFileDialog1.ShowDialog(this) == DialogResult.OK) 
			{
				SaveFile();
			}
		}		
		private void menu_EditClear_Click(object sender, System.EventArgs e)
		{
			this.Items.Clear();
			this.myPicture.Invalidate();
		}
		private void menu_FileExit_Click(object sender, System.EventArgs e)
		{
			this.Close();
		}

		private void menu_EditSelAll_Click(object sender, System.EventArgs e)
		{
			foreach (object obj in Items) {
				MyItem item = obj as MyItem;
				if (item != null) {
					item.Select(myPicture.CreateGraphics(),
						myPicture.BackColor);
				}			
			}
		}
		private void menu_EditSize_Click(object sender, System.EventArgs e)
		{	
			NewPaint pt = new NewPaint(this.myPicture.Width,this.myPicture.Height);
			pt.ShowDialog(this);

			this.myPicture.Width = pt.ImageWidth;
			this.myPicture.Height = pt.ImageHeight;
			imgWidth = pt.ImageWidth;
			imgHeight = pt.ImageHeight;
			if (this.ImgFileName != null && ImgFileName != "") {
				Image img = Image.FromFile(ImgFileName);
				this.myPicture.CreateGraphics().DrawImage(
					img,0,0,imgWidth,imgHeight);
			}
			PaintItems();
		}

		private void menu_EditDelItem_Click(object sender, System.EventArgs e)
		{
			foreach (object obj in Items) 
			{
				MyItem item = obj as MyItem;
				if (item != null && item.IsSelected) 
				{
					Items.Remove(item);
				}			
			}
			this.myPicture.Invalidate();
		}
		private void menu_HelpAbout_Click(object sender, System.EventArgs e)
		{
			MessageBox.Show("由无名工作室出品！","绘图板");
		}

		private void menu_PenColor_Click(object sender, System.EventArgs e)
		{
			if (this.colorDialog1.ShowDialog(this) == DialogResult.OK) {
				this.pencolor = colorDialog1.Color;
			}
		}

		private void menu_PenWidth_Click(object sender, System.EventArgs e)
		{
			ChooseWidth cw = new ChooseWidth();
			cw.ShowDialog(this);
			this.penwidth = cw.PenWidth;
		}

		private void menu_PenStyle_Click(object sender, System.EventArgs e)
		{
			ChooseStyle cs = new ChooseStyle();
			cs.ShowDialog(this);
			this.penstyle = cs.PenStyle;
		}
		#endregion
		#region 自定义方法和字段
		private void ResizeControls()
		{
			this.myPanel.Left = this.ClientRectangle.Left;
			this.myPanel.Top = this.ClientRectangle.Top   this.MainToolBar.Height;
			this.myPanel.Width = this.ClientRectangle.Width;
			this.myPanel.Height = this.ClientRectangle.Height
				- this.MainToolBar.Height - this.myStatusBar.Height;

			this.myPicture.Left = 0;
			this.myPicture.Top = 0;
		}
		private void PaintItems()
		{
			Graphics g = myPicture.CreateGraphics();
			if (ImgFileName != null && ImgFileName!="") 
			{
				Image img = Image.FromFile(ImgFileName);
				this.myPicture.Width = imgWidth;
				this.myPicture.Height = imgHeight;
				g.DrawImage(img,0,0,imgWidth,imgHeight);

			}
			foreach (object obj in Items) 
			{
				MyItem Item = obj as MyItem;
				if (Item != null) 
				{
					Item.Draw(g,myPicture.BackColor);
				}
			}
		}	
		private void SaveFile()
		{
			FileName = saveFileDialog1.FileName;
			FileInfo finfo = new FileInfo(FileName);
			IsSaved = true;
			if (finfo.Extension == ".pat")  // 保存绘图板文件
			{
				System.Runtime.Serialization.IFormatter format =
					new System.Runtime.Serialization.
					Formatters.Binary.BinaryFormatter();
				FileStream fs = finfo.Open(FileMode.OpenOrCreate,
					FileAccess.ReadWrite,FileShare.ReadWrite);
				format.Serialize(fs,Items);
				fs.Close();
			}
			else // 保存图像文件
			{
				System.Drawing.Bitmap bmp =
					new Bitmap(myPicture.Width,myPicture.Height);
				Graphics g = Graphics.FromImage(bmp);
				g.Clear(Color.White);
				foreach (object obj in Items) 
				{
					MyItem item = obj as MyItem;
					if (item != null) 
					{
						item.Draw(g,myPicture.BackColor);
					}						
				}
				System.Drawing.Imaging.ImageFormat format = null;
				switch(finfo.Extension) 
				{
					case ".bmp":
						format = ImageFormat.Bmp;
						break;
					case ".jpg":
					case ".jpeg":
						format = ImageFormat.Jpeg;
						break;
					case ".gif":
						format = ImageFormat.Gif;
						break;
				}
				bmp.Save(FileName,format);
			}
		}
		#endregion

	}
	public enum ClickState{Free,DrawBusy,MoveBusy,RotateBusy}
}