C#

protected void OnPrintPage(object sender, PrintPageEventArgs e)
{
    int res = 3;
    float mmToInches = 1.0f / 25.4f;
    int width = (int)(LabelSettings.Width * mmToInches);
    int height = (int)(LabelSettings.Height * mmToInches); 
    
    Bitmap bitmap = new Bitmap(1,1);
    Artist = Graphics.FromImage(bitmap);
    int bitMapDpiX = (int) Artist.DpiX; // 96
    int bitMapDpiY = (int) Artist.DpiY; // 96
    Artist.Dispose();

    bitmap = new Bitmap(width * (int) e.Graphics.DpiX, height * (int) e.Graphics.DpiY);
    //bitmap.SetResolution((int)e.Graphics.DpiX, (int)e.Graphics.DpiY);

    Artist = Graphics.FromImage(bitmap);
    DrawLabel(); // Graphics.DrawXYZ()...
    Artist.Dispose();

    e.Graphics.DrawImage(bitmap, 0, 0);
    e.HasMorePages = false;
}

David935 wrote:

Bitmap bitmap = new Bitmap(1,1);
Artist = Graphics.FromImage(bitmap);
int bitMapDpiX = (int) Artist.DpiX; // 96
int bitMapDpiY = (int) Artist.DpiY; // 96

David935 wrote:

Artist = Graphics.FromImage(bitmap);
DrawLabel(); // Graphics.DrawXYZ()...
Artist.Dispose();

David935 wrote:

Should I be setting the PageUnits

bitmap = new Bitmap(width * (int) e.Graphics.DpiX, height * (int) e.Graphics.DpiY);

bitmap.SetResolution(bitMapDpiX, bitMapDpiY);

bitmap = new Bitmap(width * (int) e.Graphics.DpiX * 2, height * (int) e.Graphics.DpiY * 2);

bitmap.SetResolution(bitMapDpiX * 2, bitMapDpiY * 2);

David935 wrote:

Doing so makes the resulting image significantly smaller.

protected void OnPrintPage(object sender, PrintPageEventArgs e) {
    float mmPerInch = 25.4f;
	// size in printer pixels
    int width = (int)(LabelSettings.Width * e.Graphics.DpiX / mmPerInch);
    int height = (int)(LabelSettings.Height * e.Graphics.DpiY / mmPerInch);
    Console.WriteLine("width="+width+"  heigth="+height);
    
    bitmap = new Bitmap(width, height);
    using (Artist = Graphics.FromImage(bitmap)) {
        DrawLabel(Artist, width, height);
    }

    e.Graphics.DrawImage(bitmap, 0, 0);
    bitmap.Dispose();
    e.HasMorePages = false;
}

Font font=new Font("Arial", 14);
Brush brush=new SolidBrush(Color.Black);

protected void DrawLabel(Graphics g, int width, int heigth) {
	g.DrawRectangle(Pen.Black, 1, 1, width-2, height-2);
	g.DrawString("Test font quality", font, brush, 3, 3);
}

David935 wrote:

You had streamlined my example a bit

        // private float mmToInches = 1.0f / 25.4f;
// private float xMultiplyer = mmToInches * e.Graphics.DpiX;
// private float yMultiplyer = mmToInches * e.Graphics.DpiY;
// private Rectangle rect = new Rectangle(LabelElement.Left, LabelElement.Top, LabelElement.Width, LabelElement.Height);

//Draw(e.Graphics, rect, xMultiplyer, yMultiplyer, someRichText);

public static void Draw(Graphics graphics, RectangleF mm, float xScale, float yScale, string richText)
{
    float mmToTwips = (1f / 10f) * 567f; // 567 twips per cm, 1440 twips per inch 

    RichTextBox edit = new RichTextBox();
    edit.Rtf = richText;

    SafeNativeMethods.RECT twips;
    twips.Left = 0;
    twips.Top = 0;
    twips.Right = (int)(mm.Width * mmToTwips);
    twips.Bottom = (int)(mm.Height * mmToTwips);

    using (Bitmap drawArea = new Bitmap((int)(twips.Right), (int)(twips.Bottom)))
    {
        using (Graphics drawAreaGraphics = Graphics.FromImage(drawArea))
        {
            IntPtr hdc = drawAreaGraphics.GetHdc();

            SafeNativeMethods.FORMATRANGE fmtRange;
            fmtRange.chrg.cpMax = -1;           //Indicate character from to character to 
            fmtRange.chrg.cpMin = 0;
            fmtRange.hdc = hdc;                 //Use the same DC for measuring and rendering
            fmtRange.hdcTarget = hdc;           //Point at printer hDC
            fmtRange.rc = twips;                //Indicate the area on page to print
            fmtRange.rcPage = twips;            //Indicate size of page

            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);

            SafeNativeMethods.SendMessage(edit.Handle, SafeNativeMethods.EM_FORMATRANGE, wParam, lParam);

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

            //Release the device context handle obtained by a previous call
            drawAreaGraphics.ReleaseHdc(hdc);
        }
        graphics.DrawImage(drawArea, mm.Left * xScale, mm.Top * yScale);
    }
}