pdfConvertWindowToPDFCoords2
Convert PDF coordinates to window coordinates.
void pdfConvertWindowToPDFCoords2(PDFViewerHandle viewer, int winX, int winY,
int *page, double *pdfX, double *pdfY)
XpdfViewer functions deal with two different coordinate spaces. In the
window coordinate space, (0,0) is the upper-left corner of the window,
and the units are pixels. In the PDF coordinate space, the origin is
determined by the PDF file (and may even change from page to page),
and the units are points (1 point = 1/72 inch).
This function converts a point from window coordinates
(winX, winY) to PDF coordinates (returned
in *page, *pdfX, *pdfY).
C:
int page, winX, winY;
double pdfX, pdfY;
winX = ...;
winY = ...;
pdfConvertWindowToPDFCoords2(viewer, winX, winY, &page, &pdfX, &pdfY);