Text in PDF

[inyazar]

Hello,

Is it possible to insert text or graphic in an existing PDF in a existing page.

Thanks.

Best Regards

[amy.zhao]

Hello,

Thanks for your inquiry.
I provide you with some example code as below, and attched pdf documents(original, result). Hope can help you.

Code: Select all

static void Main(string[] args)
        {
            PdfDocument document = new PdfDocument();
            document.LoadFromFile(@"..\..\test.pdf");
            PdfPageBase page = document.Pages[0];
         
            DrawGraphics(page);

            PdfSolidBrush brush = new PdfSolidBrush(Color.Green);
            PdfFont font = new PdfFont(PdfFontFamily.TimesRoman, 20f);
            // draw text
            page.Canvas.DrawString("Hello World", font, brush, 20, 400);

            document.SaveToFile("result.pdf");
            System.Diagnostics.Process.Start("result.pdf");
        }
        static void DrawGraphics(PdfPageBase page)
        {
            PointF[] points = new PointF[5];
            for (int i = 0; i < points.Length; i++)
            {
                float x = (float)Math.Cos(i * 2 * Math.PI / 5);
                float y = (float)Math.Sin(i * 2 * Math.PI / 5);
                points[i] = new PointF(x, y);
            }
            PdfPath path = new PdfPath();
            path.AddLine(points[2], points[0]);
            path.AddLine(points[0], points[3]);
            path.AddLine(points[3], points[1]);
            path.AddLine(points[1], points[4]);
            path.AddLine(points[4], points[2]);

            //save graphics state
            PdfGraphicsState state = page.Canvas.Save();
            PdfPen pen = new PdfPen(Color.DeepSkyBlue, 0.02f);

            page.Canvas.ScaleTransform(50f, 50f);
            page.Canvas.TranslateTransform(2f, 5f);
            page.Canvas.DrawPath(pen, path);

            PdfRadialGradientBrush brush = new PdfRadialGradientBrush(new PointF(0f, 0f), 0f, new PointF(0f, 0f), 1f, Color.Red, Color.Blue);
            page.Canvas.TranslateTransform(3f, 0.1f);
            path.FillMode = PdfFillMode.Winding;
            page.Canvas.DrawPath(pen, brush, path);

            //restore graphics
            page.Canvas.Restore(state);
        }


Best regards,
Amy
E-iceblue support team

[amy.zhao]

Hello,

Have you tried the code? Did it resolve your issue?
Thanks for your feedback.

Best regards,
Amy
E-iceblue support team

[inyazar]

Hi Gary,

I need to insert text into an especific position in the PDF file.

I need to select the position with the mouse. The user will do it.

Is it posible to use PDF and PDF viewer to do it?
May I have an example in VB.NET.

Thanks.

Best regards,
Galder

[Gary.zhang]

Hello Galder,

Thanks for your feedback.
If you need to achieve it by programmatically, you only get the position selected by the user and pass it to the following method.

Code: Select all

page.Canvas.DrawString("This is position test", font, brush, position)

and all the code is also as below.
If you want to achieve timely interaction, sorry that Our Spire.PDF only supports in code-behind to operate the PDF file.

Code: Select all

Dim pdfdocument As New PdfDocument
pdfdocument.LoadFromFile("Sample.pdf")
Dim page As PdfPageBase
page = pdfdocument.Pages(0)
Dim font As PdfFont = New PdfFont(PdfFontFamily.Helvetica, 10.0F)
Dim brush As PdfSolidBrush = New PdfSolidBrush(Color.Blue)
Dim position As PointF = New PointF(100, 100)
page.Canvas.DrawString("This is position test", font, brush, position)
pdfdocument.SaveToFile("result.pdf", FileFormat.PDF)


If there are any questions, welcome to get it back to us.
Thanks,
Gary
E-iceblue support team

[Gary.zhang]

Hello Galder,

Has the issue been resolved? Could you please give us some feedback if convenience?

If there are any questions, welcome to get it back to us.

Thanks,
Gary
E-iceblue support team