Ink annotations and location on page

[Bulent Ozbilgin]

Hi,

I'm trying to incorporate drawn annotations to a page.  To do that, I'm putting a canvas object, letting the user do the drawing on the canvas, and then transfering the drawing contents on to the PDF file.  The action I describe above works fine.  However, when I try to transfer the drawings to the PDF that is being viewed on-screen, I'm having trouble putting them in the visually correct location, especially if the PDF is zoomed in.  

For instance, at regular zoom, I can compute an X-offset value, and then compute the correct Y-value and then put the annotation in the expected place.  However, when the PDF viewer is zoomed in, the drawing annotation appears off to the side and to the bottom.  I tried incorporating zoom factors into the calculations, and could not get it right under zooming conditions.  It looks like if I could get a reference to the top/bottom/any location on the zoomed view, I'd be able to derive the offset from there but I could not figure it out.

On a separate note, I could not get ZoomTo() method to work programmatically for a PDF loaded into the viewer.

I have a function that does the drawing, and it is pasted below.  Can you please let me know whether I'm on the correct path, and if there's something that I'm missing re: zoomed PDF object?  If nothing obvious, I can package the contents in a separate project and send over.

Thanks,

Bulent

---------------START CODE

        private void DrawLineOnPDF()

        {

            //draw the line on the PDF loaded in the memory, based on the lines drawn on the canvas

            PdfPen redPen = new PdfPen(PdfBrushes.Red, m_CurrentDrawingSize);

            //get the scaling factor to convert position on page to position on the PDF page

            double pageWidth = m_loadedDocument.Pages[currentPageIndex].Size.Width;

            double pageHeight = m_loadedDocument.Pages[currentPageIndex].Size.Height;

            float pixelPageHeight = m_converter.ConvertToPixels((float)pageHeight, PdfGraphicsUnit.Point);

            float pixelPageWidth = m_converter.ConvertToPixels((float)pageWidth, PdfGraphicsUnit.Point);

            //M_ZOOMFACTOR IS DERIVED FROM pdfViewer.Zoom value, an integer

            float zoomConversionFactor = m_zoomFactor / 100.0f;

            //trying the annotations approach

            List annotInkPoints = new List();

            //THE FOLLOWING CALCULATION FOR OFFSETPIXELSX WORKS WHEN ZOOM IS AT 100, FAILS IF ZOOM INCREASES

            float OffsetPixelsX = (float)syncFusionPDFViewer.ActualWidth - (pixelPageWidth * zoomConversionFactor);

            OffsetPixelsX = OffsetPixelsX / 2.0f;

            //SIMILARLY, OFFSETPIXELSY WORKS WHEN ZOOM IS AT 100, FAILS AT HIGHER ZOOMS

            float OffsetPixelsY = (pixelPageHeight * zoomConversionFactor) - pixelPageHeight;

            //ViewerPointsList is a list of custom ViewerPoint structure which has 4 double values to represent coordinates

            foreach (ViewerPoint curPoint in ViewerPointsList)

            {

                float startX, startY, finishX, finishY;

                startX = m_converter.ConvertFromPixels((float)curPoint.X1 - OffsetPixelsX, PdfGraphicsUnit.Point);

                startY = m_converter.ConvertFromPixels(pixelPageHeight - (float)curPoint.Y1 - OffsetPixelsY, PdfGraphicsUnit.Point);

                finishX = m_converter.ConvertFromPixels((float)curPoint.X2 - OffsetPixelsX, PdfGraphicsUnit.Point);

                finishY = m_converter.ConvertFromPixels(pixelPageHeight - (float)curPoint.Y2 - OffsetPixelsY, PdfGraphicsUnit.Point);

                annotInkPoints.Add(startX);

                annotInkPoints.Add(startY);

                annotInkPoints.Add(finishX);

                annotInkPoints.Add(finishY);

            }

            System.Drawing.RectangleF rect = new System.Drawing.RectangleF(0.0f, 0.0f, (float)pageWidth, (float)pageHeight);

            Syncfusion.Pdf.Interactive.PdfInkAnnotation annot = new Syncfusion.Pdf.Interactive.PdfInkAnnotation(rect, annotInkPoints);

            annot.Color = new PdfColor(redPen.Color.R, redPen.Color.G, redPen.Color.B);

            annot.BorderWidth = 100;

            annot.Size = new System.Drawing.SizeF(100f, 100f);

            System.Drawing.PointF locationF = new System.Drawing.PointF(0.0f, 0.0f);

            annot.Location = locationF;

            m_loadedDocument.Pages[currentPageIndex].Annotations.Add(annot);

            //clear the canvas object

            inkCanvas.Children.Clear();

            //finally, clear the points list

            ViewerPointsList.Clear();

            //load the document back into the viewer and refresh the view on screen

            syncFusionPDFViewer.LoadDocument(m_loadedDocument);

            //THE FOLLOWING IS THE ZOOMING FUNCTIONALITY THAT DOES NOT WORK VISUALLY UPON RE-LOADING THE DOCUMENT

            syncFusionPDFViewer.ZoomTo(m_zoomFactor);

        }

---------------END CODE

[Karthikeyan Chandrasekar]

Hi Bulent,

Thank you for your interest in Syncfusion Products.

 

We have created an incident for this query, please follow the incident 130829 for more details.

 

Thanks,

Karthikeyan.C

[Bulent Ozbilgin]

Thank you, I will follow the incidents based on numbers provided.

Bulent

[Karthikeyan Chandrasekar]

Hi Bulent,

Thank you for your update.

 

Regards,

Karthikeyan.C