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Image position issue while using Aspose.Pdf

We have Aspose 6.x product and have a problem with adding image to pdf

We are adding a QR code to the bottom right corner of each PDF. Not all PDFs will place the image in the right spot. Some pdf places it in UPPER RIGHT instead of Bottom Right.

We specify the location to be bottom right but some pdfs will reverse it.


This message was posted using Email2Forum by Tahir Manzoor.

Hi Nelson,


Thanks for your inquiry. Please share your sample PDF document and code, we will test the scenario at our end and will guide you accordingly.

We are sorry for the inconvenience caused.

Best Regards,

IMPORTANT
- MUST Rename Attached File SampleQR.jpg to SampleQR.bmp.
- The forum does not allow me to upload a bmp file. So I had to rename the extension.

Attached are 3 PDFs. The file names indicate which one needs to use reversed y-axis coordinate.

- This method will add the sample QR code image to the bottom right corner of each page.
- Uncomment this line in the code to bypass the heuristics to see the QR code going to the wrong corner on 2 of the attached PDFs
- //isReverseYCoordinate = false;

QUESTION: What do I need to check to know for sure if the PDF needs to use reversed y-coordinate? The heuristics I implemented is a band-aid and is not reliable.


/
Platform: .Net 4.5.1
Version: Aspose.pdf 6.7.0.0

This method accepts a path to a pdf file.
- Opens pdf.
- Iterates pages.
- Add QR code to bottom right corner of each page.

- Heuristics - the code checks some pdf properties to determine if need to reverse y-coordinate when embedding a QR code.
/

private void AddQrCode(String docPath)
{
// determine img width - matches sample image
Int32 imgWidth = 40;

//set license
License license = new License();
license.SetLicense(String.Format(@"{0}\Aspose.Pdf.lic", HttpRuntime.AppDomainAppPath));

// load file
Document pdfDoc = new Document(docPath);

// HEURISTICS TO DETERMINE IF NEED TO REVSERVE Y-AXIS COORDINATE
Boolean isReverseYCoordinate = false;

// check creator
String[] checkPdfCreatorsArr = “FrameMaker 7.|PScript5.dll Version 5.”.Split(’|’);
foreach (String s in checkPdfCreatorsArr) {
if (pdfDoc.Info.Creator.StartsWith(s)) {
isReverseYCoordinate = true;
break;
}
}

// check version
if (!isReverseYCoordinate) {
if (String.CompareOrdinal(pdfDoc.Version, “1.5”) < 0) {
// less than 1.5
isReverseYCoordinate = true;
}
}

// override flag for testing
//isReverseYCoordinate = false;

// END HEURISTICS

// iterate pages
foreach (Aspose.Pdf.Page pdfPage in pdfDoc.Pages) {

// create QR image and convert to memory stream
Bitmap bmp = (Bitmap)System.Drawing.Image.FromFile(@“C:\TestQR\SampleQR.bmp”);

// NORMALLY - when y-axis does not need to be reversed, we need to rotate the QR code by 270-deg.
// BUT, if y-axis needs to be reversed, no need to rotate QR code.
if (!isReverseYCoordinate) {
bmp.RotateFlip(RotateFlipType.Rotate270FlipNone);
}

MemoryStream memStream = new MemoryStream();
bmp.Save(memStream, ImageFormat.Bmp);
memStream.ToArray();

// add image to page resources
pdfPage.Resources.Images.Add(memStream);

//using GSave operator: this operator saves current graphics state
pdfPage.Contents.Add(new Operator.GSave());

// coordinates for QR code - bottom right corner
Double pageWidth = pdfPage.Rect.Width;
Double pageHeight = pdfPage.Rect.Height;

Double lowerLeftX = pageWidth - imgWidth;
Double lowerLeftY = pageHeight;
Double upperRightX = pageWidth;
Double upperRightY = pageHeight - imgWidth;

// REVERSE THE RECTANGLE Y-AXIS COORDINATES TO ADD IMAGE TO TOP RIGHT, SO IT WILL BE PLACED ON BOTTOM RIGHT!
if (isReverseYCoordinate) {
lowerLeftY = _defaultImgWidth;
upperRightY = 0;
}

//create Rectangle and Matrix objects
Aspose.Pdf.Rectangle rectangle = new Aspose.Pdf.Rectangle(lowerLeftX, lowerLeftY, upperRightX, upperRightY);
Matrix matrix = new Aspose.Pdf.DOM.Matrix(new Double[] { rectangle.URX - rectangle.LLX, 0, 0, rectangle.URY - rectangle.LLY, rectangle.LLX, rectangle.LLY });

//using ConcatenateMatrix (concatenate matrix) operator: defines how image must be placed
pdfPage.Contents.Add(new Operator.ConcatenateMatrix(matrix));
XImage ximage = pdfPage.Resources.Images[pdfPage.Resources.Images.Count];

//using Do operator: this operator draws image
pdfPage.Contents.Add(new Operator.Do(ximage.Name));

//using GRestore operator: this operator restores graphics state
pdfPage.Contents.Add(new Operator.GRestore());
}

// save file
String newFileName = String.Concat(“Output-”, DateTime.Now.Ticks, “.pdf”);
pdfDoc.Save(String.Format(@“c:\TestQR{0}”, newFileName));
}

Hi Nelson,

Thanks for sharing your source code and documents. While testing the scenario with your shared documents, we have managed to reproduce the issue with latest version of Aspose.Pdf for .NET 9.6.0. We have logged a ticket PDFNEWNET-37572 in our issue tracking system for further investigation and resolution. We will notify you as soon as it is resolved.

We are sorry for the inconvenience caused.

Best Regards,