Watermark is applied upside down when PDF

[sureshkumar.arumugam]

Hi Team,

I attempted to put a watermark, however it appears on the document's opposite side. please refer the code as below


private Stream ApplyPdfWatermark(Stream fileStream, List<string> data, WatermarkSettings settings,
WatermarkFileOutputType fileOutputType)
{
string text = string.Join(Environment.NewLine, data);

PdfBrush pdfBrush = FontColorMappings.GetFontColor(settings.FontColor);

int noOfMarkerLines = data.Count + 2;

float opacity = settings.Opacity / 100.0f;

var outputStream = new MemoryStream();

using (var doc = new PdfDocument())
{
doc.LoadFromStream(fileStream);

foreach (PdfPageBase page in doc.Pages)
{
RectangleF rectangleF = CalculateWatermarker(page.ActualSize.Width, page.ActualSize.Height);

var fontSize = (int)(Math.Min(rectangleF.Height, rectangleF.Width) / noOfMarkerLines);

var font = new PdfFont(PdfFontFamily.Helvetica, settings.AutoScale ? fontSize : settings.FontSize);

var pdfTilingBrush = new PdfTilingBrush(
new SizeF(page.ActualSize.Width, page.ActualSize.Height));

pdfTilingBrush.Graphics.SetTransparency(opacity);
_ = pdfTilingBrush.Graphics.Save();

float centerX = page.ActualSize.Width / 2;
float centerY = page.ActualSize.Height / 2;

rectangleF.X = page.ActualSize.Width / 2 - rectangleF.Width / 2;
rectangleF.Y = page.ActualSize.Height / 2 - rectangleF.Height / 2;

double radian = Math.Atan(page.ActualSize.Height / page.ActualSize.Width);
var degree = (float)(radian * (180 / Math.PI));

pdfTilingBrush.Graphics.RotateTransform(-degree, new PointF(centerX, centerY));

pdfTilingBrush.Graphics.DrawString(text,
font, pdfBrush, rectangleF,
new PdfStringFormat(PdfTextAlignment.Center, PdfVerticalAlignment.Middle));

pdfTilingBrush.Graphics.Restore();

page.Canvas.DrawRectangle(pdfTilingBrush,
new RectangleF(new PointF(0, 0), page.Canvas.ClientSize));
}

if (WatermarkFileOutputType.Png == fileOutputType)
{
doc.SaveToImageStream(0, outputStream, nameof(WatermarkFileOutputType.Png));
}
else
{
doc.SaveToStream(outputStream, FileFormat.PDF);
}

_ = outputStream.Seek(0, SeekOrigin.Begin);
return outputStream;
}
}

[Ula.wang]

Hi,

Thanks for your inquiry.
You can refer to the following picture to modify your code:

lQLPJxJqqyyTjRTM9s0CrrDUnyRR40XlfQT7OFrMgE8A_686_246.png

If you have any issue, just feel free to contact us.

Sincerely,
Ula
E-iceblue support team

[sureshkumar.arumugam]

The same issue would persist if you update the script as you suggested.

[Ula.wang]

Hi,

Thanks for your feedback.
Please note that the page of your document has a 270 degree rotation. You can obtain the angle of page rotation through the first line circled in the red box in the image. Therefor, to achieve the effect you wanted, you need to rotate the watermark 315 degrees (270+45) counterclockwise.
You can refer to the following picture to modify your code:

27665E7A-4B55-446e-8DFF-EB40AC59B4C9.png

Sincerely,
Ula
E-iceblue support team

[Ula.wang]

Hi,

Thank you for your more inquiry.
The page rotation angle of the two documents you provided are different with the rotation angle of pdf you provided last time, so you need to set different Angle for the watermarked text.For those pdf files which have all kinds of page rotation angle, if you want to use the same code to achieve the same effect, you can obtain the rotation angle of the page and calculate the watermark rotation angle ,please refer to the following code:

Code: Select all

PdfDocument doc = new PdfDocument();
            doc.LoadFromFile(@"34577\New folder\New folder\4_PreviewDocument_output.pdf");

            //Get the first page
            PdfPageBase page = doc.Pages[0];
            Console.WriteLine(page.Rotation);
            PdfPageRotateAngle rotateAngle = page.Rotation;
            String Text=rotateAngle.ToString();
            String subString = Text.Substring(11);   
            int number = int.Parse(subString);

            //Draw text watermark
            PdfTilingBrush brush
                = new PdfTilingBrush(new SizeF(page.Canvas.ClientSize.Width / 2, page.Canvas.ClientSize.Height / 3));
            brush.Graphics.SetTransparency(0.3f);
            brush.Graphics.Save();
            brush.Graphics.TranslateTransform(brush.Size.Width / 2, brush.Size.Height / 2);
            brush.Graphics.RotateTransform(-(number + 45));
            String text = "20230912\nWelcom Support\nSupport@Welcom";
            brush.Graphics.DrawString(text,
                new PdfFont(PdfFontFamily.Helvetica, 24), PdfBrushes.Violet, 0, 0,
                new PdfStringFormat(PdfTextAlignment.Center));
            brush.Graphics.Restore();
            brush.Graphics.SetTransparency(1);
            page.Canvas.DrawRectangle(brush, new RectangleF(new PointF(0, 0), page.Canvas.ClientSize));
            //Save pdf file
            doc.SaveToFile(@"E:34577\\New folder\\New folder\\7.pdf");
            doc.Close();

Sincerely,
Ula
E-iceblue support team

[Ula.wang]

Hi,

I would like to know if you have resolved the issue you have encountered, and our team hope to have more communication with you.If you have any issue just feel free to contact us.Thank you in advance.

Sincerely
Ula
E-iceblue support team