Calculate text height based on available width and font?

Question

We are creating PDF documents on the fly from the database using PDFsharp.

I need to know the best way to calculate the height of the text area based on the font used and the available width.

I need to know the height so I can process page breaks when required.

Answer 1

The PdfSharp.Drawing.XGraphics object has a MeasureString method that returns what you require.

 var pdfDoc = new PdfSharp.Pdf.PdfDocument();
 var pdfPage = pdfDoc.AddPage();
 var pdfGfx = PdfSharp.Drawing.XGraphics.FromPdfPage(pdfPage);
 var pdfFont = new PdfSharp.Drawing.XFont("Helvetica", 20);

 while (pdfGfx.MeasureString("Hello World!").Width > pdfPage.Width)
      --pdfFont.Size;

 pdfGfx.DrawString("Hello World!", pdfFont
      , PdfSharp.Drawing.XBrushes.Black
      , new PdfSharp.Drawing.XPoint(100, 100));

This should help you. Please consider that I didn't test this code as I wrote it on the fly in order to help. It might contain some compile-time errors, but you may get the idea.

Answer 2

In .NET you can call Graphics.MeasureString to find out how large the drawn text is going to be.

Right, but when using PDFsharp you call XGraphics.MeasureString.