Console: Draw text in rectangle on PDF page and maintain aspect ratio of text.

[Alex]

Here is C# code that demonstrates how to draw text in rectangle on PDF page and maintain aspect ratio of text:

Code: Select all

class Program
{

    static void Main(string[] args)
    {
        // create new PDF document
        using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument())
        {
            // add empty page to the PDF document
            document.Pages.Add(new Vintasoft.Imaging.Pdf.Tree.PdfPage(document, Vintasoft.Imaging.PaperSizeKind.A4));

            // create PDF font
            Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont font =
                document.FontManager.GetStandardFont(Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman);

            // get graphics object for PDF page
            using (Vintasoft.Imaging.Pdf.Drawing.PdfGraphics graphics = document.Pages[0].GetGraphics())
            {
                // use green brush
                graphics.SetBrush(new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Green));
                // draw text in rectangle and do not maintain aspect ratio of text
                DrawTextInRect(graphics, "Test string (no aspect ratio)", font, new System.Drawing.RectangleF(50, 200, 500, 200), false);

                // use red brush
                graphics.SetBrush(new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Red));
                // draw text in rectangle and maintain aspect ratio of text
                DrawTextInRect(graphics, "Test string (maintain aspect ratio)", font, new System.Drawing.RectangleF(50, 200, 500, 200), true);
            }

            // save PDF document to a file
            document.Save("out.pdf");
        }
    }

    public static void DrawTextInRect(
        Vintasoft.Imaging.Pdf.Drawing.PdfGraphics graphics,
        string text,
        Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont font,
        System.Drawing.RectangleF rect,
        bool maintainAspectRatio)
    {
        const float FontSize = 1;

        // measure text
        graphics.MeasureString(text, font, FontSize, out float textWidth, out float textHeight);

        // calulate scales
        float scaleX = rect.Width / textWidth;
        float scaleY = rect.Height / textHeight;
        if (maintainAspectRatio)
        {
            if (scaleX > scaleY)
            {
                scaleX = scaleY;
                rect.X += (rect.Width - textWidth * scaleX) / 2;
            }
            else
            {
                scaleY = scaleX;
                rect.Y += (rect.Height - textHeight * scaleY) / 2;
            }
        }

        // save graphics state
        graphics.SaveGraphicsState();

        // set transform
        Vintasoft.Imaging.AffineMatrix transform = Vintasoft.Imaging.AffineMatrix.CreateTranslation(rect.X, rect.Y);
        transform.MultiplyPrepend(Vintasoft.Imaging.AffineMatrix.CreateScaling(scaleX, scaleY));
        graphics.MultiplyTransform(transform);

        // draw text
        graphics.DrawString(text, font, FontSize, 0, 0);

        // restore graphics state
        graphics.RestoreGraphicsState();
    }

}