[c#] sadrzaj richtext box-a sa se snimi kao slika

Code:

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Printing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace WindowsApplication1
{
    static class Program
    {

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            PrintableRichTextBox rich = new PrintableRichTextBox();
            rich.LoadFile(@"c:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\EULA.rtf");


            Form form = new Form();
            PrintPreviewControl preview = new PrintPreviewControl();
            preview.Dock = DockStyle.Fill;
            preview.Document = rich.CreatePrintDocument();
            preview.Document.DefaultPageSettings.Margins = new Margins(20, 20, 20, 20);
            form.Controls.Add(preview);
            form.WindowState = FormWindowState.Maximized;
            form.ShowDialog();
            form.Dispose();

            DisplayImage(rich.ToBitmap(new Size(1024, 768)));
        }

        /// <summary>
        /// Debug method, displays image in a dialog.
        /// </summary>
        public static void DisplayImage(Image image, PictureBoxSizeMode sizeMode)
        {
            Form form = null;
            PictureBox pictureBox = null;
            Label label = null;
            try {
                form = new Form();
                pictureBox = new PictureBox();
                string labelText = string.Empty;
                try {
                    if(image != null) {
                        pictureBox.Image = image;
                        pictureBox.SizeMode = sizeMode;
                        pictureBox.Dock = DockStyle.Fill;
                        form.Controls.Add(pictureBox);
                    } else {
                        labelText = "null";
                    }
                } catch(Exception ex) {
                    labelText = ex.ToString() + Environment.NewLine + Environment.NewLine + ex.Message;
                }
                if(!string.IsNullOrEmpty(labelText)) {
                    label = new Label();
                    label.AutoSize = false;
                    label.Text = labelText;
                    label.TextAlign = ContentAlignment.MiddleCenter;
                    label.Dock = DockStyle.Fill;
                    form.Controls.Add(label);
                }
                //form.Size = new Size(800, 600);
                form.StartPosition = FormStartPosition.CenterScreen;
                form.ShowDialog();
            } catch { }
            try { if(label != null) label.Dispose(); } catch { }
            try { if(pictureBox != null) pictureBox.Dispose(); } catch { }
            try { if(form != null) form.Dispose(); } catch { }
        }

        /// <summary>
        /// Debug method, displays image in a dialog.
        /// </summary>
        public static void DisplayImage(Image image)
        {
            DisplayImage(image, PictureBoxSizeMode.CenterImage);
        }
    }

    [ToolboxItem(true)]
    [ToolboxBitmap(typeof(TextBox))]
    public class PrintableRichTextBox: RichTextBox
    {
        //Convert the unit used by the .NET framework (1/100 inch) 
        //and the unit used by Win32 API calls (twips 1/1440 inch)
        private const double anInch = 14.4;

        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct CHARRANGE
        {
            public int cpMin;         //First character of range (0 for start of doc)
            public int cpMax;           //Last character of range (-1 for end of doc)
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct FORMATRANGE
        {
            public IntPtr hdc;             //Actual DC to draw on
            public IntPtr hdcTarget;       //Target DC for determining text formatting
            public RECT rc;                //Region of the DC to draw to (in twips)
            public RECT rcPage;            //Region of the whole DC (page size) (in twips)
            public CHARRANGE chrg;         //Range of text to draw (see earlier declaration)
        }

        private const int WM_USER = 0x0400;
        private const int EM_FORMATRANGE = WM_USER + 57;

        [DllImport("USER32.dll")]
        private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);

        // Render the contents of the RichTextBox for printing
        //    Return the last character printed + 1 (printing start from this point for next page)
        public int Print(int charFrom, int charTo, PrintPageEventArgs e)
        {
            //Calculate the area to render and print
            RECT rectToPrint;
            rectToPrint.Top = (int)(e.MarginBounds.Top * anInch);
            rectToPrint.Bottom = (int)(e.MarginBounds.Bottom * anInch);
            rectToPrint.Left = (int)(e.MarginBounds.Left * anInch);
            rectToPrint.Right = (int)(e.MarginBounds.Right * anInch);

            //Calculate the size of the page
            RECT rectPage;
            rectPage.Top = (int)(e.PageBounds.Top * anInch);
            rectPage.Bottom = (int)(e.PageBounds.Bottom * anInch);
            rectPage.Left = (int)(e.PageBounds.Left * anInch);
            rectPage.Right = (int)(e.PageBounds.Right * anInch);

            IntPtr hdc = e.Graphics.GetHdc();

            FORMATRANGE fmtRange;
            fmtRange.chrg.cpMax = charTo;                //Indicate character from to character to 
            fmtRange.chrg.cpMin = charFrom;
            fmtRange.hdc = hdc;                    //Use the same DC for measuring and rendering
            fmtRange.hdcTarget = hdc;              //Point at printer hDC
            fmtRange.rc = rectToPrint;             //Indicate the area on page to print
            fmtRange.rcPage = rectPage;            //Indicate size of page

            IntPtr res = IntPtr.Zero;

            IntPtr wparam = IntPtr.Zero;
            wparam = new IntPtr(1);

            //Get the pointer to the FORMATRANGE structure in memory
            IntPtr lparam = IntPtr.Zero;
            lparam = Marshal.AllocCoTaskMem(Marshal.SizeOf(fmtRange));
            Marshal.StructureToPtr(fmtRange, lparam, false);

            //Send the rendered data for printing 
            res = SendMessage(Handle, EM_FORMATRANGE, wparam, lparam);

            //Free the block of memory allocated
            Marshal.FreeCoTaskMem(lparam);

            //Release the device context handle obtained by a previous call
            e.Graphics.ReleaseHdc(hdc);

            //Return last + 1 character printer
            return res.ToInt32();
        }

        public PrintDocument CreatePrintDocument()
        {
            PrintDocument printDocument = new PrintDocument();
            printDocument.BeginPrint += new PrintEventHandler(printDocument_BeginPrint);
            printDocument.PrintPage += new PrintPageEventHandler(printDocument_PrintPage);
            return printDocument;
        }

        private int checkPrint = 0;
        private void printDocument_BeginPrint(object sender, PrintEventArgs e)
        {
            checkPrint = 0;
        }
        private void printDocument_PrintPage(object sender, PrintPageEventArgs e)
        {
            // Print the content of RichTextBox. Store the last character printed.
            checkPrint = this.Print(checkPrint, this.TextLength, e);

            // Check for more pages
            if(checkPrint < this.TextLength)
                e.HasMorePages = true;
            else
                e.HasMorePages = false;
        }



        public Bitmap ToBitmap(Size size)
        {            
            Bitmap bitmap = new Bitmap(size.Width, size.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            Graphics g = Graphics.FromImage(bitmap);
            //g.Clear(Color.White);
            PrintPageEventArgs e = new PrintPageEventArgs(g,  new Rectangle(Point.Empty, bitmap.Size), new Rectangle(Point.Empty, bitmap.Size), new PageSettings());
            this.Print(0, this.TextLength, e);
            g.Dispose();
            return bitmap;
        }
    }
}

Code:

        public Bitmap ToBitmap(Size size, int id)
        {
            Bitmap bitmap = new Bitmap(size.Width, size.Height, PixelFormat.Format32bppArgb);
            bitmap.MakeTransparent(); // probao sam i sa i bez ove linije
            Graphics g = Graphics.FromImage(bitmap);
            g.Clear(Color.Transparent); 
            //PrintPageEventArgs e = new PrintPageEventArgs(g, new Rectangle(Point.Empty, bitmap.Size), new Rectangle(Point.Empty, bitmap.Size), new PageSettings());
            //this.Print(0, this.TextLength, e);
            g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            bitmap.Save("img/" + id.ToString() + ".png", ImageFormat.Png);
            g.Dispose();
            return bitmap;
        }

Code:

public static void DisplayImage(Image image, PictureBoxSizeMode sizeMode)

Code:

rich.BackColor = Color.FromArgb(140, 14, 14);