C#经典实例----画图程序

1、这是一个简单的画图程序其源码是：using System.Drawing;using System;using System.Windows.Forms;using System.Drawing.Imaging;namespace WindowsApplication1 partial class Form1 / / 必需的设计器变量。 / private System.ComponentModel.IContainer components = null; / / 清理所有正在使用的资源。 / / 如果应释放托管资源，为 true；否则为 false。 protected override

2、void Dispose(bool disposing) if (disposing & (components != null) components.Dispose(); base.Dispose(disposing); public Form1() InitializeComponent(); #region Windows 窗体设计器生成的代码 / / 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。 / private void InitializeComponent() ponents = new System.ComponentModel.Container(

3、); this.menuStrip1 = new System.Windows.Forms.MenuStrip(); this.文件ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.Open = new System.Windows.Forms.ToolStripMenuItem(); this.NEW = new System.Windows.Forms.ToolStripMenuItem(); this.saveFile = new System.Windows.Forms.ToolStripMen

4、uItem(); this.Exist = new System.Windows.Forms.ToolStripMenuItem(); this.编辑颜色ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.关于ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.toolTip1 = new System.Windows.Forms.ToolTip(ponents); this.menuStrip2 = new Sys

5、tem.Windows.Forms.MenuStrip(); this.画笔工具ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.画直线ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.画椭圆ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.画矩形ToolStripMenuItem = new System.Windows

6、.Forms.ToolStripMenuItem(); this.橡皮擦ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.鼠标ToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.saveFiles = new System.Windows.Forms.SaveFileDialog(); this.openFiles = new System.Windows.Forms.OpenFileDialog(); this.

7、panel1 = new System.Windows.Forms.Panel(); this.label1 = new System.Windows.Forms.Label(); this.button1 = new System.Windows.Forms.Button(); this.menuStrip1.SuspendLayout(); this.menuStrip2.SuspendLayout(); this.panel1.SuspendLayout(); this.SuspendLayout(); / / menuStrip1 / this.menuStrip1.Items.Add

8、Range(new System.Windows.Forms.ToolStripItem this.文件ToolStripMenuItem, this.编辑颜色ToolStripMenuItem, this.关于ToolStripMenuItem); this.menuStrip1.Location = new System.Drawing.Point(0, 0); this.menuStrip1.Name = menuStrip1; this.menuStrip1.Size = new System.Drawing.Size(305, 24); this.menuStrip1.TabInde

9、x = 0; this.menuStrip1.Text = menuStrip1; / / 文件ToolStripMenuItem / this.文件ToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem this.Open, this.NEW, this.saveFile, this.Exist); this.文件ToolStripMenuItem.Name = 文件ToolStripMenuItem; this.文件ToolStripMenuItem.Size = new System.

10、Drawing.Size(43, 20); this.文件ToolStripMenuItem.Text = 文件; / / Open / this.Open.Name = Open; this.Open.Size = new System.Drawing.Size(98, 22); this.Open.Text = 打开; this.Open.Click += new System.EventHandler(this.Open_Click); / / NEW / this.NEW.Name = NEW; this.NEW.Size = new System.Drawing.Size(98, 2

11、2); this.NEW.Text = 新建; this.NEW.Click += new System.EventHandler(this.NEW_Click); / / saveFile / this.saveFile.Name = saveFile; this.saveFile.Size = new System.Drawing.Size(98, 22); this.saveFile.Text = 保存; this.saveFile.Click += new System.EventHandler(this.saveFile_Click); / / Exist / this.Exist.

12、Name = Exist; this.Exist.Size = new System.Drawing.Size(98, 22); this.Exist.Text = 退出; this.Exist.Click+= new System.EventHandler(this. Exist_Click); / / 编辑颜色ToolStripMenuItem / this.编辑颜色ToolStripMenuItem.Name = 编辑颜色ToolStripMenuItem; this.编辑颜色ToolStripMenuItem.Size = new System.Drawing.Size(67, 20)

13、; this.编辑颜色ToolStripMenuItem.Text = 编辑颜色; this.编辑颜色ToolStripMenuItem.Click += new System.EventHandler(this.编辑颜色ToolStripMenuItem_Click); / / 关于ToolStripMenuItem / this.关于ToolStripMenuItem.Name = 关于ToolStripMenuItem; this.关于ToolStripMenuItem.Size = new System.Drawing.Size(43, 20); this.关于ToolStripMen

14、uItem.Text = 关于; this.关于ToolStripMenuItem.Click += new System.EventHandler(this.关于ToolStripMenuItem_Click); / / toolTip1 / this.toolTip1.ShowAlways = true; / / menuStrip2 / this.menuStrip2.Dock = System.Windows.Forms.DockStyle.Bottom; this.menuStrip2.Enabled = false; this.menuStrip2.GripStyle = Syst

15、em.Windows.Forms.ToolStripGripStyle.Visible; this.menuStrip2.Items.AddRange(new System.Windows.Forms.ToolStripItem this.画笔工具ToolStripMenuItem, this.画直线ToolStripMenuItem, this.画椭圆ToolStripMenuItem, this.画矩形ToolStripMenuItem, this.橡皮擦ToolStripMenuItem, this.鼠标ToolStripMenuItem); this.menuStrip2.Locati

16、on = new System.Drawing.Point(0, 332); this.menuStrip2.Name = menuStrip2; this.menuStrip2.Size = new System.Drawing.Size(305, 24); this.menuStrip2.TabIndex = 1; this.menuStrip2.Text = menuStrip2; this.menuStrip2.ItemClicked += new System.Windows.Forms.ToolStripItemClickedEventHandler(this.menuStrip2

17、_ItemClicked); / / 画笔工具ToolStripMenuItem / this.画笔工具ToolStripMenuItem.Name = 画笔工具ToolStripMenuItem; this.画笔工具ToolStripMenuItem.Size = new System.Drawing.Size(43, 20); this.画笔工具ToolStripMenuItem.Text = 画笔; / / 画直线ToolStripMenuItem / this.画直线ToolStripMenuItem.Name = 画直线ToolStripMenuItem; this.画直线ToolS

18、tripMenuItem.Size = new System.Drawing.Size(55, 20); this.画直线ToolStripMenuItem.Text = 画直线; / / 画椭圆ToolStripMenuItem / this.画椭圆ToolStripMenuItem.Name = 画椭圆ToolStripMenuItem; this.画椭圆ToolStripMenuItem.Size = new System.Drawing.Size(55, 20); this.画椭圆ToolStripMenuItem.Text = 画椭圆; / / 画矩形ToolStripMenuIte

19、m / this.画矩形ToolStripMenuItem.Name = 画矩形ToolStripMenuItem; this.画矩形ToolStripMenuItem.Size = new System.Drawing.Size(55, 20); this.画矩形ToolStripMenuItem.Text = 画矩形; / / 橡皮擦ToolStripMenuItem / this.橡皮擦ToolStripMenuItem.Name = 橡皮擦ToolStripMenuItem; this.橡皮擦ToolStripMenuItem.Size = new System.Drawing.Siz

20、e(55, 20); this.橡皮擦ToolStripMenuItem.Text = 橡皮擦; / / 鼠标ToolStripMenuItem / this.鼠标ToolStripMenuItem.Name = 鼠标ToolStripMenuItem; this.鼠标ToolStripMenuItem.Size = new System.Drawing.Size(43, 20); this.鼠标ToolStripMenuItem.Text = 鼠标; / / openFiles / this.openFiles.FileName = 图像文件; / / panel1 / this.panel

21、1.Controls.Add(this.label1); this.panel1.Controls.Add(this.button1); this.panel1.Location = new System.Drawing.Point(12, 59); this.panel1.Name = panel1; this.panel1.Size = new System.Drawing.Size(281, 131); this.panel1.TabIndex = 2; this.panel1.Visible = false; / / label1 / this.label1.AutoSize = tr

22、ue; this.label1.Location = new System.Drawing.Point(3, 29); this.label1.Name = label1; this.label1.Size = new System.Drawing.Size(275, 12); this.label1.TabIndex = 1; this.label1.Text = 更多资料到查看?/zhouxiaoming; / / button1 / this.button1.Location = new System.Drawing.Point(121, 105); this.button1.Name

23、= button1; this.button1.Size = new System.Drawing.Size(75, 23); this.button1.TabIndex = 0; this.button1.Text = 关闭; this.button1.UseVisualStyleBackColor = true; this.button1.Click += new System.EventHandler(this.button1_Click); / / Form1 / this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

24、 this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(305, 356); this.Controls.Add(this.panel1); this.Controls.Add(this.menuStrip1); this.Controls.Add(this.menuStrip2); this.Cursor = System.Windows.Forms.Cursors.Default; this.MainMenuStrip = this.me

25、nuStrip1; this.Name = Form1; this.Text = Form1; this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint); this.SizeChanged += new System.EventHandler(this.Form1_SizeChanged); this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp); this.MouseMove += new Syste

26、m.Windows.Forms.MouseEventHandler(this.Form1_MouseMove); this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown); this.menuStrip1.ResumeLayout(false); this.menuStrip1.PerformLayout(); this.menuStrip2.ResumeLayout(false); this.menuStrip2.PerformLayout(); this.panel1.ResumeL

27、ayout(false); this.panel1.PerformLayout(); this.ResumeLayout(false); this.PerformLayout(); #endregion private System.Windows.Forms.MenuStrip menuStrip1; private System.Windows.Forms.ToolStripMenuItem 文件ToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem Open; private System.Windows.For

28、ms.ToolStripMenuItem NEW; private System.Windows.Forms.ToolStripMenuItem saveFile; private System.Windows.Forms.ToolStripMenuItem Exist; private System.Windows.Forms.ToolStripMenuItem 编辑颜色ToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 关于ToolStripMenuItem; private System.Windows.Fo

29、rms.ToolTip toolTip1; private System.Windows.Forms.MenuStrip menuStrip2; private System.Windows.Forms.ToolStripMenuItem 画笔工具ToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 画直线ToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 画矩形ToolStripMenuItem; private System.Wind

30、ows.Forms.ToolStripMenuItem 画椭圆ToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 橡皮擦ToolStripMenuItem; private System.Windows.Forms.SaveFileDialog saveFiles; private System.Windows.Forms.OpenFileDialog openFiles; private System.Windows.Forms.ToolStripMenuItem 鼠标ToolStripMenuItem; pri

31、vate System.Windows.Forms.Panel panel1; private System.Windows.Forms.Label label1; private System.Windows.Forms.Button button1; / / 应用程序的主入口点。 / STAThread static void Main() Application.Run(new Form1(); /布尔型变量，是否正在绘图 private bool isDrawing = false; /绘图时记录鼠标的位置 private Point startPoint, oldPoint; /枚举

32、类型，各种绘图工具 private enum drawTools Pen = 0, Line, Ellipse, Rectangle, String, Rubber, None ; /当前使用的工具 private drawTools drawTool = drawTools.None; private string editFileName; private Image theImage; private Graphics ig; private Color foreColor = Color.Black; private Color backColor = Color.White; pri

33、vate int i = 0;/在保存文件是用来标记文件 private void Open_Click(object sender, EventArgs e) openFiles.Filter = Image Files(*.bmp;*.wmf;*.ico;*.cur;*.jgp)|*.bmp;*.wmf;*.ico;*.cur;*.jpg; openFiles.Multiselect = false; if (openFiles.ShowDialog() = DialogResult.OK) /修改窗口标题 this.Text = openFiles.FileName; editFileN

34、ame = openFiles.FileName; theImage = Image.FromFile(openFiles.FileName); Graphics g = this.CreateGraphics(); g.DrawImage(theImage, this.ClientRectangle); ig = Graphics.FromImage(theImage); ig.DrawImage(theImage, this.ClientRectangle); menuStrip2.Enabled = true; private void NEW_Click(object sender,

35、EventArgs e) Graphics g = this.CreateGraphics(); g.Clear(backColor); menuStrip2.Enabled = true; /创建一个Bitmap theImage = new Bitmap(this.ClientRectangle.Width, this.ClientRectangle.Height); editFileName = 新建文件; /修改窗口标题 this.Text = editFileName; ig = Graphics.FromImage(theImage); ig.Clear(backColor); p

36、rivate void saveFile_Click(object sender, EventArgs e) saveFiles.Filter = 图像(*.bmp)|*.bmp; saveFiles.FileName = editFileName; if (saveFiles.ShowDialog() = DialogResult.OK) theImage.Save(saveFiles.FileName, ImageFormat.Bmp); this.Text = saveFiles.FileName; editFileName = saveFiles.FileName; i+; priva

37、te void 编辑颜色ToolStripMenuItem_Click(object sender, EventArgs e) ColorDialog colorDg = new ColorDialog(); if (colorDg.ShowDialog() = DialogResult.OK) foreColor = colorDg.Color; private void menuStrip2_ItemClicked(object sender, ToolStripItemClickedEventArgs e) switch (menuStrip2.Items.IndexOf(e.Click

38、edItem) case 0: drawTool = drawTools.Pen; this.Cursor = Cursors.Hand; break; case 1: drawTool = drawTools.Line; this.Cursor = Cursors.Cross; break; case 2: drawTool = drawTools.Ellipse; this.Cursor = Cursors.Cross; break; case 3: drawTool = drawTools.Rectangle; this.Cursor = Cursors.Cross; break; ca

39、se 4: drawTool = drawTools.Rubber; this.Cursor = Cursors.No; break; case 5: drawTool = drawTools.None; this.Cursor = Cursors.Default; break; /鼠标按下 private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) if (e.Button = MouseButtons.Left) if (isDrawing = !isDrawing) = true)

40、startPoint = new Point(e.X, e.Y); oldPoint = new Point(e.X, e.Y); /鼠标移动 private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) Graphics g; g = this.CreateGraphics(); if (isDrawing) switch (drawTool) case drawTools.None: break; case drawTools.Pen: /从上一个点到当前点绘制线段 g.DrawLine(new Pen(foreColor, 1), oldPoint, new Point(e.X, e.Y); ig.DrawLine(new Pen(foreColor, 1), oldPoint, new Point(e.X, e.Y); oldPoint.X = e.X; oldPoi