网站上传源码后怎么弄注册一个公司流程和时间

网站上传源码后怎么弄,注册一个公司流程和时间,开封市网站开发公司,成都市做网站的公司简单易用的C#画板程序#xff0c;适合初学者学习。这个画板包含基本的绘图功能#xff0c;如画笔、橡皮擦、形状绘制等。 1. 主窗体设计 (Form1.Designer.cs) partial class Form1 {private System.ComponentModel.IContainer components null;private System.Windows.Forms…简单易用的C#画板程序适合初学者学习。这个画板包含基本的绘图功能如画笔、橡皮擦、形状绘制等。1. 主窗体设计 (Form1.Designer.cs)partialclassForm1{privateSystem.ComponentModel.IContainercomponentsnull;privateSystem.Windows.Forms.PanelpanelToolBox;privateSystem.Windows.Forms.PanelpanelCanvas;privateSystem.Windows.Forms.ButtonbtnPencil;privateSystem.Windows.Forms.ButtonbtnLine;privateSystem.Windows.Forms.ButtonbtnRectangle;privateSystem.Windows.Forms.ButtonbtnEllipse;privateSystem.Windows.Forms.ButtonbtnEraser;privateSystem.Windows.Forms.ButtonbtnClear;privateSystem.Windows.Forms.ButtonbtnColor;privateSystem.Windows.Forms.NumericUpDownnumSize;privateSystem.Windows.Forms.PictureBoxpictureBoxCanvas;privateSystem.Windows.Forms.ColorDialogcolorDialog;privateSystem.Windows.Forms.LabellblTool;privateSystem.Windows.Forms.LabellblSize;privateSystem.Windows.Forms.ButtonbtnSave;privateSystem.Windows.Forms.ButtonbtnOpen;privateSystem.Windows.Forms.SaveFileDialogsaveFileDialog;privateSystem.Windows.Forms.OpenFileDialogopenFileDialog;protectedoverridevoidDispose(booldisposing){if(disposing(components!null)){components.Dispose();}base.Dispose(disposing);}privatevoidInitializeComponent(){this.componentsnewSystem.ComponentModel.Container();this.panelToolBoxnewSystem.Windows.Forms.Panel();this.btnSavenewSystem.Windows.Forms.Button();this.btnOpennewSystem.Windows.Forms.Button();this.lblSizenewSystem.Windows.Forms.Label();this.lblToolnewSystem.Windows.Forms.Label();this.numSizenewSystem.Windows.Forms.NumericUpDown();this.btnColornewSystem.Windows.Forms.Button();this.btnClearnewSystem.Windows.Forms.Button();this.btnErasernewSystem.Windows.Forms.Button();this.btnEllipsenewSystem.Windows.Forms.Button();this.btnRectanglenewSystem.Windows.Forms.Button();this.btnLinenewSystem.Windows.Forms.Button();this.btnPencilnewSystem.Windows.Forms.Button();this.panelCanvasnewSystem.Windows.Forms.Panel();this.pictureBoxCanvasnewSystem.Windows.Forms.PictureBox();this.colorDialognewSystem.Windows.Forms.ColorDialog();this.saveFileDialognewSystem.Windows.Forms.SaveFileDialog();this.openFileDialognewSystem.Windows.Forms.OpenFileDialog();this.panelToolBox.SuspendLayout();((System.ComponentModel.ISupportInitialize)(this.numSize)).BeginInit();this.panelCanvas.SuspendLayout();((System.ComponentModel.ISupportInitialize)(this.pictureBoxCanvas)).BeginInit();this.SuspendLayout();// panelToolBoxthis.panelToolBox.BackColorSystem.Drawing.SystemColors.ControlDark;this.panelToolBox.Controls.Add(this.btnSave);this.panelToolBox.Controls.Add(this.btnOpen);this.panelToolBox.Controls.Add(this.lblSize);this.panelToolBox.Controls.Add(this.lblTool);this.panelToolBox.Controls.Add(this.numSize);this.panelToolBox.Controls.Add(this.btnColor);this.panelToolBox.Controls.Add(this.btnClear);this.panelToolBox.Controls.Add(this.btnEraser);this.panelToolBox.Controls.Add(this.btnEllipse);this.panelToolBox.Controls.Add(this.btnRectangle);this.panelToolBox.Controls.Add(this.btnLine);this.panelToolBox.Controls.Add(this.btnPencil);this.panelToolBox.DockSystem.Windows.Forms.DockStyle.Left;this.panelToolBox.LocationnewSystem.Drawing.Point(0,0);this.panelToolBox.NamepanelToolBox;this.panelToolBox.SizenewSystem.Drawing.Size(120,600);this.panelToolBox.TabIndex0;// btnSavethis.btnSave.LocationnewSystem.Drawing.Point(10,350);this.btnSave.NamebtnSave;this.btnSave.SizenewSystem.Drawing.Size(100,30);this.btnSave.TabIndex11;this.btnSave.Text保存;this.btnSave.UseVisualStyleBackColortrue;this.btnSave.ClicknewSystem.EventHandler(this.btnSave_Click);// btnOpenthis.btnOpen.LocationnewSystem.Drawing.Point(10,310);this.btnOpen.NamebtnOpen;this.btnOpen.SizenewSystem.Drawing.Size(100,30);this.btnOpen.TabIndex10;this.btnOpen.Text打开;this.btnOpen.UseVisualStyleBackColortrue;this.btnOpen.ClicknewSystem.EventHandler(this.btnOpen_Click);// lblSizethis.lblSize.AutoSizetrue;this.lblSize.LocationnewSystem.Drawing.Point(10,250);this.lblSize.NamelblSize;this.lblSize.SizenewSystem.Drawing.Size(41,12);this.lblSize.TabIndex9;this.lblSize.Text粗细;// lblToolthis.lblTool.AutoSizetrue;this.lblTool.FontnewSystem.Drawing.Font(宋体,9F,System.Drawing.FontStyle.Bold);this.lblTool.LocationnewSystem.Drawing.Point(10,10);this.lblTool.NamelblTool;this.lblTool.SizenewSystem.Drawing.Size(57,12);this.lblTool.TabIndex8;this.lblTool.Text绘图工具;// numSizethis.numSize.LocationnewSystem.Drawing.Point(10,270);this.numSize.Minimumnewdecimal(newint[]{1,0,0,0});this.numSize.NamenumSize;this.numSize.SizenewSystem.Drawing.Size(100,21);this.numSize.TabIndex7;this.numSize.Valuenewdecimal(newint[]{3,0,0,0});// btnColorthis.btnColor.BackColorSystem.Drawing.Color.Black;this.btnColor.LocationnewSystem.Drawing.Point(10,220);this.btnColor.NamebtnColor;this.btnColor.SizenewSystem.Drawing.Size(100,30);this.btnColor.TabIndex6;this.btnColor.UseVisualStyleBackColorfalse;this.btnColor.ClicknewSystem.EventHandler(this.btnColor_Click);// btnClearthis.btnClear.LocationnewSystem.Drawing.Point(10,180);this.btnClear.NamebtnClear;this.btnClear.SizenewSystem.Drawing.Size(100,30);this.btnClear.TabIndex5;this.btnClear.Text清空画板;this.btnClear.UseVisualStyleBackColortrue;this.btnClear.ClicknewSystem.EventHandler(this.btnClear_Click);// btnEraserthis.btnEraser.LocationnewSystem.Drawing.Point(10,150);this.btnEraser.NamebtnEraser;this.btnEraser.SizenewSystem.Drawing.Size(100,30);this.btnEraser.TabIndex4;this.btnEraser.Text橡皮擦;this.btnEraser.UseVisualStyleBackColortrue;this.btnEraser.ClicknewSystem.EventHandler(this.btnEraser_Click);// btnEllipsethis.btnEllipse.LocationnewSystem.Drawing.Point(10,120);this.btnEllipse.NamebtnEllipse;this.btnEllipse.SizenewSystem.Drawing.Size(100,30);this.btnEllipse.TabIndex3;this.btnEllipse.Text椭圆;this.btnEllipse.UseVisualStyleBackColortrue;this.btnEllipse.ClicknewSystem.EventHandler(this.btnEllipse_Click);// btnRectanglethis.btnRectangle.LocationnewSystem.Drawing.Point(10,90);this.btnRectangle.NamebtnRectangle;this.btnRectangle.SizenewSystem.Drawing.Size(100,30);this.btnRectangle.TabIndex2;this.btnRectangle.Text矩形;this.btnRectangle.UseVisualStyleBackColortrue;this.btnRectangle.ClicknewSystem.EventHandler(this.btnRectangle_Click);// btnLinethis.btnLine.LocationnewSystem.Drawing.Point(10,60);this.btnLine.NamebtnLine;this.btnLine.SizenewSystem.Drawing.Size(100,30);this.btnLine.TabIndex1;this.btnLine.Text直线;this.btnLine.UseVisualStyleBackColortrue;this.btnLine.ClicknewSystem.EventHandler(this.btnLine_Click);// btnPencilthis.btnPencil.LocationnewSystem.Drawing.Point(10,30);this.btnPencil.NamebtnPencil;this.btnPencil.SizenewSystem.Drawing.Size(100,30);this.btnPencil.TabIndex0;this.btnPencil.Text铅笔;this.btnPencil.UseVisualStyleBackColortrue;this.btnPencil.ClicknewSystem.EventHandler(this.btnPencil_Click);// panelCanvasthis.panelCanvas.BackColorSystem.Drawing.SystemColors.AppWorkspace;this.panelCanvas.Controls.Add(this.pictureBoxCanvas);this.panelCanvas.DockSystem.Windows.Forms.DockStyle.Fill;this.panelCanvas.LocationnewSystem.Drawing.Point(120,0);this.panelCanvas.NamepanelCanvas;this.panelCanvas.SizenewSystem.Drawing.Size(680,600);this.panelCanvas.TabIndex1;// pictureBoxCanvasthis.pictureBoxCanvas.BackColorSystem.Drawing.Color.White;this.pictureBoxCanvas.DockSystem.Windows.Forms.DockStyle.Fill;this.pictureBoxCanvas.LocationnewSystem.Drawing.Point(0,0);this.pictureBoxCanvas.NamepictureBoxCanvas;this.pictureBoxCanvas.SizenewSystem.Drawing.Size(680,600);this.pictureBoxCanvas.TabIndex0;this.pictureBoxCanvas.TabStopfalse;this.pictureBoxCanvas.MouseDownnewSystem.Windows.Forms.MouseEventHandler(this.pictureBoxCanvas_MouseDown);this.pictureBoxCanvas.MouseMovenewSystem.Windows.Forms.MouseEventHandler(this.pictureBoxCanvas_MouseMove);this.pictureBoxCanvas.MouseUpnewSystem.Windows.Forms.MouseEventHandler(this.pictureBoxCanvas_MouseUp);// saveFileDialogthis.saveFileDialog.FilterPNG 图片|*.png|JPEG 图片|*.jpg|BMP 图片|*.bmp;// openFileDialogthis.openFileDialog.Filter图片文件|*.png;*.jpg;*.bmp;// Form1this.AutoScaleDimensionsnewSystem.Drawing.SizeF(6F,12F);this.AutoScaleModeSystem.Windows.Forms.AutoScaleMode.Font;this.ClientSizenewSystem.Drawing.Size(800,600);this.Controls.Add(this.panelCanvas);this.Controls.Add(this.panelToolBox);this.NameForm1;this.Text简易画板;this.LoadnewSystem.EventHandler(this.Form1_Load);this.panelToolBox.ResumeLayout(false);this.panelToolBox.PerformLayout();((System.ComponentModel.ISupportInitialize)(this.numSize)).EndInit();this.panelCanvas.ResumeLayout(false);((System.ComponentModel.ISupportInitialize)(this.pictureBoxCanvas)).EndInit();this.ResumeLayout(false);}}2. 主窗体代码 (Form1.cs)usingSystem;usingSystem.Drawing;usingSystem.Drawing.Drawing2D;usingSystem.IO;usingSystem.Windows.Forms;namespaceSimplePaint{publicpartialclassForm1:Form{// 绘图工具枚举privateenumDrawingTool{Pencil,Line,Rectangle,Ellipse,Eraser}// 变量声明privateDrawingToolcurrentToolDrawingTool.Pencil;privateBitmapcanvasBitmap;privateGraphicscanvasGraphics;privatePencurrentPen;privatePeneraserPen;privatePointstartPoint;privatePointendPoint;privateboolisDrawingfalse;privateBitmaptempBitmap;privateGraphicstempGraphics;publicForm1(){InitializeComponent();InitializeDrawingTools();}privatevoidInitializeDrawingTools(){// 初始化画笔currentPennewPen(Color.Black,(float)numSize.Value);currentPen.StartCapLineCap.Round;currentPen.EndCapLineCap.Round;// 初始化橡皮擦白色画笔eraserPennewPen(Color.White,(float)numSize.Value);eraserPen.StartCapLineCap.Round;eraserPen.EndCapLineCap.Round;// 初始化画布InitializeCanvas();}privatevoidInitializeCanvas(){// 创建画布位图canvasBitmapnewBitmap(pictureBoxCanvas.Width,pictureBoxCanvas.Height);canvasGraphicsGraphics.FromImage(canvasBitmap);canvasGraphics.SmoothingModeSmoothingMode.AntiAlias;canvasGraphics.Clear(Color.White);// 设置PictureBox的图像pictureBoxCanvas.ImagecanvasBitmap;}privatevoidForm1_Load(objectsender,EventArgse){// 窗体加载时的初始化UpdateToolSelection();}privatevoidUpdateToolSelection(){// 更新工具按钮的选中状态btnPencil.BackColor(currentToolDrawingTool.Pencil)?SystemColors.ControlLight:SystemColors.Control;btnLine.BackColor(currentToolDrawingTool.Line)?SystemColors.ControlLight:SystemColors.Control;btnRectangle.BackColor(currentToolDrawingTool.Rectangle)?SystemColors.ControlLight:SystemColors.Control;btnEllipse.BackColor(currentToolDrawingTool.Ellipse)?SystemColors.ControlLight:SystemColors.Control;btnEraser.BackColor(currentToolDrawingTool.Eraser)?SystemColors.ControlLight:SystemColors.Control;}// 工具按钮点击事件privatevoidbtnPencil_Click(objectsender,EventArgse){currentToolDrawingTool.Pencil;UpdateToolSelection();}privatevoidbtnLine_Click(objectsender,EventArgse){currentToolDrawingTool.Line;UpdateToolSelection();}privatevoidbtnRectangle_Click(objectsender,EventArgse){currentToolDrawingTool.Rectangle;UpdateToolSelection();}privatevoidbtnEllipse_Click(objectsender,EventArgse){currentToolDrawingTool.Ellipse;UpdateToolSelection();}privatevoidbtnEraser_Click(objectsender,EventArgse){currentToolDrawingTool.Eraser;UpdateToolSelection();}privatevoidbtnColor_Click(objectsender,EventArgse){// 颜色选择对话框if(colorDialog.ShowDialog()DialogResult.OK){currentPen.ColorcolorDialog.Color;btnColor.BackColorcolorDialog.Color;}}privatevoidbtnClear_Click(objectsender,EventArgse){// 清空画布if(MessageBox.Show(确定要清空画板吗,确认,MessageBoxButtons.YesNo,MessageBoxIcon.Question)DialogResult.Yes){canvasGraphics.Clear(Color.White);pictureBoxCanvas.Invalidate();}}privatevoidbtnSave_Click(objectsender,EventArgse){// 保存图片if(saveFileDialog.ShowDialog()DialogResult.OK){try{stringextensionPath.GetExtension(saveFileDialog.FileName).ToLower();System.Drawing.Imaging.ImageFormatformatSystem.Drawing.Imaging.ImageFormat.Png;switch(extension){case.jpg:case.jpeg:formatSystem.Drawing.Imaging.ImageFormat.Jpeg;break;case.bmp:formatSystem.Drawing.Imaging.ImageFormat.Bmp;break;}canvasBitmap.Save(saveFileDialog.FileName,format);MessageBox.Show(图片保存成功,提示,MessageBoxButtons.OK,MessageBoxIcon.Information);}catch(Exceptionex){MessageBox.Show(保存失败: ex.Message,错误,MessageBoxButtons.OK,MessageBoxIcon.Error);}}}privatevoidbtnOpen_Click(objectsender,EventArgse){// 打开图片if(openFileDialog.ShowDialog()DialogResult.OK){try{BitmapopenedImagenewBitmap(openFileDialog.FileName);canvasGraphics.DrawImage(openedImage,0,0,pictureBoxCanvas.Width,pictureBoxCanvas.Height);pictureBoxCanvas.Invalidate();}catch(Exceptionex){MessageBox.Show(打开图片失败: ex.Message,错误,MessageBoxButtons.OK,MessageBoxIcon.Error);}}}// 鼠标事件处理privatevoidpictureBoxCanvas_MouseDown(objectsender,MouseEventArgse){if(e.ButtonMouseButtons.Left){isDrawingtrue;startPointe.Location;// 对于非铅笔工具创建临时画布用于预览if(currentTool!DrawingTool.PencilcurrentTool!DrawingTool.Eraser){tempBitmapnewBitmap(canvasBitmap);tempGraphicsGraphics.FromImage(tempBitmap);tempGraphics.SmoothingModeSmoothingMode.AntiAlias;}}}privatevoidpictureBoxCanvas_MouseMove(objectsender,MouseEventArgse){if(isDrawing){endPointe.Location;switch(currentTool){caseDrawingTool.Pencil:// 铅笔工具 - 直接绘制canvasGraphics.DrawLine(currentPen,startPoint,endPoint);startPointendPoint;pictureBoxCanvas.Invalidate();break;caseDrawingTool.Eraser:// 橡皮擦工具 - 直接绘制canvasGraphics.DrawLine(eraserPen,startPoint,endPoint);startPointendPoint;pictureBoxCanvas.Invalidate();break;caseDrawingTool.Line:caseDrawingTool.Rectangle:caseDrawingTool.Ellipse:// 其他工具 - 在临时画布上预览if(tempBitmap!null){// 恢复原始图像tempGraphics.DrawImage(canvasBitmap,0,0);// 绘制预览图形DrawPreview(tempGraphics);pictureBoxCanvas.ImagetempBitmap;}break;}}}privatevoidpictureBoxCanvas_MouseUp(objectsender,MouseEventArgse){if(isDrawinge.ButtonMouseButtons.Left){isDrawingfalse;endPointe.Location;// 在最终画布上绘制图形switch(currentTool){caseDrawingTool.Line:caseDrawingTool.Rectangle:caseDrawingTool.Ellipse:DrawPreview(canvasGraphics);pictureBoxCanvas.ImagecanvasBitmap;// 释放临时资源if(tempGraphics!null){tempGraphics.Dispose();tempBitmap.Dispose();tempGraphicsnull;tempBitmapnull;}break;}pictureBoxCanvas.Invalidate();}}privatevoidDrawPreview(Graphicsg){// 计算矩形区域intxMath.Min(startPoint.X,endPoint.X);intyMath.Min(startPoint.Y,endPoint.Y);intwidthMath.Abs(endPoint.X-startPoint.X);intheightMath.Abs(endPoint.Y-startPoint.Y);// 根据当前工具绘制图形switch(currentTool){caseDrawingTool.Line:g.DrawLine(currentPen,startPoint,endPoint);break;caseDrawingTool.Rectangle:g.DrawRectangle(currentPen,x,y,width,height);break;caseDrawingTool.Ellipse:g.DrawEllipse(currentPen,x,y,width,height);break;}}// 画笔粗细改变事件privatevoidnumSize_ValueChanged(objectsender,EventArgse){currentPen.Width(float)numSize.Value;eraserPen.Width(float)numSize.Value;}// 窗体大小改变时调整画布protectedoverridevoidOnResize(EventArgse){base.OnResize(e);if(canvasBitmap!nullpictureBoxCanvas.Width0pictureBoxCanvas.Height0){// 创建新的画布BitmapnewBitmapnewBitmap(pictureBoxCanvas.Width,pictureBoxCanvas.Height);GraphicsnewGraphicsGraphics.FromImage(newBitmap);newGraphics.SmoothingModeSmoothingMode.AntiAlias;newGraphics.Clear(Color.White);// 将旧画布内容绘制到新画布上newGraphics.DrawImage(canvasBitmap,0,0);// 更新引用canvasGraphics.Dispose();canvasBitmap.Dispose();canvasBitmapnewBitmap;canvasGraphicsnewGraphics;pictureBoxCanvas.ImagecanvasBitmap;}}// 资源释放protectedoverridevoidOnFormClosed(FormClosedEventArgse){base.OnFormClosed(e);if(canvasGraphics!null)canvasGraphics.Dispose();if(canvasBitmap!null)canvasBitmap.Dispose();if(currentPen!null)currentPen.Dispose();if(eraserPen!null)eraserPen.Dispose();if(tempGraphics!null)tempGraphics.Dispose();if(tempBitmap!null)tempBitmap.Dispose();}}}3. 程序入口点 (Program.cs)usingSystem;usingSystem.Windows.Forms;namespaceSimplePaint{internalstaticclassProgram{/// summary/// 应用程序的主入口点。/// /summary[STAThread]staticvoidMain(){Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(newForm1());}}}4. 项目配置文件 (SimplePaint.csproj)ProjectSdkMicrosoft.NET.SdkPropertyGroupOutputTypeWinExe/OutputTypeTargetFrameworknet6.0-windows/TargetFrameworkUseWindowsFormstrue/UseWindowsFormsApplicationIconpaint.ico/ApplicationIcon/PropertyGroupItemGroupPackageReferenceIncludeSystem.Drawing.CommonVersion6.0.0//ItemGroup/Project5. 扩展功能类 - 添加文本工具// TextToolForm.cs - 文本输入窗体usingSystem;usingSystem.Drawing;usingSystem.Windows.Forms;namespaceSimplePaint{publicpartialclassTextToolForm:Form{publicstringEnteredText{get;privateset;}publicFontSelectedFont{get;privateset;}publicColorSelectedColor{get;privateset;}publicTextToolForm(){InitializeComponent();SelectedFontnewFont(Arial,12);SelectedColorColor.Black;}privatevoidInitializeComponent(){this.txtTextnewTextBox();this.btnFontnewButton();this.btnColornewButton();this.btnOKnewButton();this.btnCancelnewButton();this.fontDialognewFontDialog();this.colorDialognewColorDialog();this.SuspendLayout();// txtTextthis.txtText.LocationnewPoint(10,10);this.txtText.Multilinetrue;this.txtText.SizenewSize(300,100);this.txtText.TabIndex0;// btnFontthis.btnFont.LocationnewPoint(10,120);this.btnFont.SizenewSize(100,30);this.btnFont.TabIndex1;this.btnFont.Text选择字体;this.btnFont.ClicknewEventHandler(this.btnFont_Click);// btnColorthis.btnColor.LocationnewPoint(120,120);this.btnColor.SizenewSize(100,30);this.btnColor.TabIndex2;this.btnColor.Text选择颜色;this.btnColor.ClicknewEventHandler(this.btnColor_Click);// btnOKthis.btnOK.LocationnewPoint(150,160);this.btnOK.SizenewSize(75,30);this.btnOK.TabIndex3;this.btnOK.Text确定;this.btnOK.ClicknewEventHandler(this.btnOK_Click);// btnCancelthis.btnCancel.LocationnewPoint(235,160);this.btnCancel.SizenewSize(75,30);this.btnCancel.TabIndex4;this.btnCancel.Text取消;this.btnCancel.ClicknewEventHandler(this.btnCancel_Click);// TextToolFormthis.ClientSizenewSize(320,200);this.Controls.AddRange(newControl[]{this.txtText,this.btnFont,this.btnColor,this.btnOK,this.btnCancel});this.FormBorderStyleFormBorderStyle.FixedDialog;this.MaximizeBoxfalse;this.MinimizeBoxfalse;this.StartPositionFormStartPosition.CenterParent;this.Text添加文本;this.ResumeLayout(false);}privatevoidbtnFont_Click(objectsender,EventArgse){if(fontDialog.ShowDialog()DialogResult.OK){SelectedFontfontDialog.Font;}}privatevoidbtnColor_Click(objectsender,EventArgse){if(colorDialog.ShowDialog()DialogResult.OK){SelectedColorcolorDialog.Color;}}privatevoidbtnOK_Click(objectsender,EventArgse){EnteredTexttxtText.Text;DialogResultDialogResult.OK;Close();}privatevoidbtnCancel_Click(objectsender,EventArgse){DialogResultDialogResult.Cancel;Close();}}}参考项目 C#入门级画板示例源码(画图板)www.3dddown.com/csa/62386.html说明功能特性基本绘图工具铅笔、直线、矩形、椭圆、橡皮擦颜色选择可自定义画笔颜色粗细调整可调整画笔和橡皮擦的粗细文件操作支持打开、保存图片PNG、JPEG、BMP格式清空画板一键清空所有绘图内容实时预览绘制形状时有实时预览效果编译和运行使用Visual Studio创建新的Windows Forms项目将上述代码文件添加到项目中编译并运行程序学习要点Windows Forms基础控件使用GDI绘图技术鼠标事件处理图形图像处理文件对话框操作