README.md

C# Universal Control Cropping Class

Add Cropping to any control with image or backgroundimage

I love programing especially in graphics.

I ran into a situation where I need to crop a simple picturebox wasnt as easy as anticipated.

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

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

WALA! This class was born.

Update 10/3/2022 While using I had an image with a black background had to add ability to change rectangle color for visibility.

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 diretions.

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());
        }
    }