t = pdf.GetRects(id, page, idx, len)
idx, spanning over len number of characters.
Note that character indices start at 0. If you pass -1 in len, pdf.GetRects()
will automatically extend the selection to all remaining characters.
The page to use must be specified in the page argument. It must be a number in
the range of 1 to the total number of pages in the document and the page must have
been previously loaded using pdf.LoadPage() with the text argument set
to True. The PDF document specified by id must have been previously opened using
pdf.OpenDocument().
This function will return a table containing one subtable per bounding rectangle. Each of those subtables will have the following fields initialized:
Left:Top:Right:Bottom: