C# Universal Control Cropping Class

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In this post, I will show how to add cropping to any control with image or backgroundimage.

I love programming especially in graphics.

I ran into a situation where I needed to crop a simple picturebox and it wasn't as easy as anticipated.

Then I wanted to crop a panel background image and started rewriting the code for that.

I brainstormed about how a class could be universal to any control that has some kind of image.

Voila! This class was born.

Note: The whole crop rectangle can be dragged using right mouse down and drag crop rectangle to desired are inside the control.

Use the drag by left mouse down on any of the drag handles, drag the crop rectangle in different directions.

Usage is fairly simple:

1. Create an instance of the crop class in form:

   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. The crop button code:

   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());
       }
   }