c#winform在picturebox上进行橡皮筋绘制_c#picturebox橡皮筋,c#橡皮筋资源-CSDN文库

共33个文件

cs：10个

cache：4个

config：3个

winform

picturebox

gdi+

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在C# WinForm应用中，PictureBox控件常用于显示图像，但它的功能并不仅限于此。我们可以利用GDI+（Graphics Device Interface Plus）图形库在PictureBox上实现动态绘制，比如"橡皮筋绘制"，即用户在点击鼠标并拖动时画出一条线，松开鼠标后线段固定，而图片背景保持不变。以下将详细讲解这个过程中的关键知识点。我们需要了解GDI+的基本概念。GDI+是.NET Framework中的一部分，它提供了一系列接口和类，用于创建和管理图形、字体、颜色等。在WinForm中，Graphics类是GDI+的核心，它提供了绘图的基本方法，如DrawLine、DrawRectangle等。 1. **初始化绘图环境**：在PictureBox的Paint事件中，获取Graphics对象，它是所有绘图操作的基础。例如： ```csharp private void pictureBox_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; } ``` 2. **橡皮筋绘制**：为了实现在拖动鼠标时画线的效果，我们需要在MouseDown和MouseMove事件中处理。当鼠标按下时记录起点坐标，鼠标移动时画出临时线段，这需要在OnPaintBackground方法中阻止默认背景清除，以免每次移动都重绘整个图像。 ```csharp private Point startPoint; private bool isDrawing; private void pictureBox_MouseDown(object sender, MouseEventArgs e) { startPoint = e.Location; isDrawing = true; } private void pictureBox_MouseMove(object sender, MouseEventArgs e) { if (isDrawing) { // 重新绘制，包括背景和临时线 Refresh(); DrawRope(g, startPoint, e.Location); } } private void pictureBox_MouseUp(object sender, MouseEventArgs e) { isDrawing = false; // 鼠标释放时保存最终线段，并触发重绘 SaveRope(startPoint, e.Location); Refresh(); } private void pictureBox_PaintBackground(object sender, PaintEventArgs e) { // 不清除背景，保留图片 } ``` 3. **绘制线段**：在DrawRope方法中，我们使用Graphics.DrawLines方法绘制从起点到当前位置的线段，颜色和线宽可以根据需求设置。 ```csharp private void DrawRope(Graphics g, Point startPoint, Point endPoint) { Pen ropePen = new Pen(Color.Red, 2); g.DrawLine(ropePen, startPoint, endPoint); } ``` 4. **保存线段**：在MouseUp事件中，我们将最终线段保存下来，可以将线段信息存储在List<Point>或自定义结构中，以便在下次Paint事件中绘制。 ```csharp private List<Point> ropes; private void SaveRope(Point startPoint, Point endPoint) { ropes.Add(startPoint); ropes.Add(endPoint); } ``` 5. **重绘所有线段**：在pictureBox的Paint事件中，除了绘制背景图像，还要根据保存的线段信息重新绘制所有线条。 ```csharp private void pictureBox_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; // 绘制背景图片 g.DrawImage(image, 0, 0); // 绘制所有保存的线段 foreach (var rope in ropes) { if (rope.Next() != null) { g.DrawLine(new Pen(Color.Red, 2), rope, rope.Next()); } } } ``` 以上就是C# WinForm中在PictureBox上实现橡皮筋绘制的关键步骤。通过这种方式，用户可以在图片上自由画线，而不会覆盖原有的图像内容，为图像编辑提供了便捷的交互方式。同时，还可以扩展这个功能，比如添加撤销/重做、选择线段颜色、改变线宽等功能，以满足更复杂的图形编辑需求。

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橡皮筋绘制.7z （33个子文件）

橡皮筋绘制

.vs

WindowsFormsApplication1

v14

.suo 50KB

WindowsFormsApplication1

Form2.resx 55KB

Program.cs 536B

Line.cs 907B

WindowsFormsApplication1.csproj 4KB

Form2.Designer.cs 3KB

Properties

Settings.settings 249B

Resources.Designer.cs 3KB

AssemblyInfo.cs 1KB

Settings.Designer.cs 1KB

Resources.resx 5KB

App.config 189B

obj

Debug

WindowsFormsApplication1.csproj.FileListAbsolute.txt 3KB

TempPE

WindowsFormsApplication1.csprojResolveAssemblyReference.cache 2KB

DesignTimeResolveAssemblyReferencesInput.cache 7KB

WindowsFormsApplication1.Form2.resources 33KB

WindowsFormsApplication1.exe 46KB

TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs 0B

DesignTimeResolveAssemblyReferences.cache 1KB

WindowsFormsApplication1.pdb 30KB

TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs 0B

TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs 0B

WindowsFormsApplication1.Form1.resources 180B

WindowsFormsApplication1.csproj.GenerateResource.Cache 1KB

WindowsFormsApplication1.Properties.Resources.resources 180B

bin

Debug

WindowsFormsApplication1.vshost.exe.manifest 490B

WindowsFormsApplication1.exe 46KB

WindowsFormsApplication1.pdb 30KB

WindowsFormsApplication1.vshost.exe.config 189B

WindowsFormsApplication1.exe.config 189B

WindowsFormsApplication1.vshost.exe 22KB

Release

Form2.cs 3KB

WindowsFormsApplication1.sln 1KB

C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe.config C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.csprojResolveAssemblyReference.cache C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form1.resources C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Properties.Resources.resources C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.csproj.GenerateResource.Cache C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.exe C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.pdb C:\Users\yuanjs\Desktop\WindowsFormsApplication1\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form2.resources C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe.config C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.exe C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.pdb C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.exe C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\bin\Debug\WindowsFormsApplication1.pdb C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.csprojResolveAssemblyReference.cache C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form1.resources C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Form2.resources C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.Properties.Resources.resources C:\Users\Administrator\Desktop\橡皮筋绘制矩形和线\WindowsFormsApplication1\obj\Debug\WindowsFormsApplication1.csproj.GenerateResource.Cache

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