C# 通用控件裁剪类

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在这篇文章中，我将展示如何为具有图像或背景图像的任何控件添加裁剪功能。

我热爱编程，尤其是在图形方面。

我遇到了一种情况，我需要裁剪一个简单的 PictureBox，但它并不像预期的那么容易。

然后我想裁剪面板的背景图像，并开始为它重写代码。

我思考着如何创建一个类，使其能够通用到任何具有某种图像的控件。

就这样！这个类诞生了。

注意：可以使用鼠标右键按住并拖动裁剪矩形，将其拖动到控件内的所需区域。

使用鼠标左键按住任何拖动句柄，拖动裁剪矩形到不同的方向。

使用方法很简单

1. 在窗体中创建裁剪类的实例

   ControlCrop ControlrectPanel;
   
   public frmCrop()
   {
       InitializeComponent();
   
       //Set crop control for each control that requires cropping
   
       //Set the Control in this case panel to add crop rectangle
       ControlrectPanel = new ControlCrop(pnlCrop);
       ControlrectPanel.SetControl(this.pnlCrop);
   
       //Set the Control in this case Picturebox to add crop rectangle
       ControlrectPicturebox = new ControlCrop(picCrop);
       ControlrectPicturebox.SetControl(this.picCrop);
   }

2. 裁剪按钮的代码

   private void btnCrop_Click(object sender, EventArgs e)
   {
       try
       {
           //Process Panel
           Rectangle rectPanel = new Rectangle
           (ControlrectPanel.rect.X, ControlrectPanel.rect.Y, 
            ControlrectPanel.rect.Width, ControlrectPanel.rect.Height);
   
           //set cropped image size and creat new bitmap
           Bitmap _pnlimg = new Bitmap(ControlrectPanel.rect.Width, 
                                       ControlrectPanel.rect.Height);
   
           //Create the original image to be cropped
           Bitmap OriginalPanelImage = 
           new Bitmap(pnlCrop.BackgroundImage, pnlCrop.Width, pnlCrop.Height);
   
           //create graphic with using statement to auto close grahics
           using (Graphics g = Graphics.FromImage(_pnlimg))
           {
               g.InterpolationMode = 
               System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
               g.PixelOffsetMode = 
               System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
               g.CompositingQuality = 
               System.Drawing.Drawing2D.CompositingQuality.HighQuality;
               ////set image attributes
               g.DrawImage(OriginalPanelImage, 0, 0, rectPanel, GraphicsUnit.Pixel);
               picCroppedPanel.Image = _pnlimg;
           }
   
           //Process Picturebox
           Rectangle rectPicturebox = new Rectangle
           (ControlrectPicturebox.rect.X, ControlrectPicturebox.rect.Y, 
                                          ControlrectPicturebox.rect.Width,
           ControlrectPicturebox.rect.Height);
           //set cropped image size and creat new bitmap
           Bitmap _pboximg = new Bitmap(ControlrectPicturebox.rect.Width, 
                                        ControlrectPicturebox.rect.Height);
   
           //Create the original image to be cropped
           Bitmap OriginalPictureboxImage = new Bitmap(picCrop.Image, 
                                            picCrop.Width, picCrop.Height);
   
           //Create graphic with using statement to auto close grahics
           using (Graphics gr = Graphics.FromImage(_pboximg))
           {
               gr.InterpolationMode = 
                  System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
               gr.PixelOffsetMode = 
                  System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
               gr.CompositingQuality = 
                  System.Drawing.Drawing2D.CompositingQuality.HighQuality;
               ////set image attributes
               gr.DrawImage(OriginalPictureboxImage, 0, 0, 
                            rectPicturebox, GraphicsUnit.Pixel);
               picCropped.Image = _pboximg;
           }
       }
       catch (Exception ex)
       {
           MessageBox.Show(ex.ToString());
       }
   }