I want to store the location of all images in a PDF, and then use that to track when a user clicks on an image in Universal (XOD) WebViewer.
However, I am having issues with translating between the two formats, and get the rectangle in the wrong location.
The following shows what information you need to store, and how to translate a rectangle from PDF to XOD coordinates.
PDFNet SDK side
Start with the ElementReader sample code and class
PDF.Rect bbox = image_element.GetBBox();
x1 = bbox.x1;
y1 = bbox.y1;
x2 = bbox.x2;
y2 = bbox.y2;
element_page = page_num;
Store above values in your database
var p1 = doc.GetXODCoordinates(element_page, x1, y1);
var p2 = doc.GetXODCoordinates(element_page, x2, y2);
var rect = new Annotations.Rect(p1.x, p1.y, p2.x, p2.y);
rect.normalize(); // make sure x1/y1 is top left corner, and height/width is positive
rect variable now contains the location of the image in WebViewer's XOD page coordinates, where 0,0 is the top left corner of the current page.
So you could create an annotation over that location.