Rotated bounding quadpoints of a page object

For objects that have been rotated by a transformation matrix (e.g. text drawn at an angle, or a placed image with a rotated Form XObject CTM), the axis-aligned bounding box from pdf_obj_bounds() is loose. pdf_obj_rotated_bounds() returns the tighter rotated rectangle as four corner points. Wraps FPDFPageObj_GetRotatedBounds.

Usage

pdf_obj_rotated_bounds(obj)

Arguments

obj

A pdfium_obj from pdf_page_objects().

Value

A length-8 named numeric vector c(x1, y1, x2, y2, x3, y3, x4, y4) in PDF user-space points, or all-NA when PDFium reports no bounds for this object.

Details

The four corners are returned in the order PDFium reports them: (x1, y1) is lower-left, (x2, y2) lower-right, (x3, y3) upper-right, (x4, y4) upper-left, where "lower" / "upper" are relative to the rotated rectangle's own local axes (not the page).

See also

pdf_obj_bounds() for the cheaper axis-aligned box.