Failure when set cropbox with mediabox negative value

[djs45]

Problem with setcropbox when mediabox have negative value

I want to set cropbox of a pdf file where mediabox is :

fitz page mediabox : Rect(-106.673, -362.691, 762.869, 1305.062)
Want To CropBox set To : -25.54 -294.47 415.66 971.34

I've got this error : ValueError: rect not in mediabox

• Windows 10
• Python version 3.10.4 64 bits
• last PyMuPDF version

I send you complete example python and pdf file

prblem_crop_pymupdf.zip

[JorjMcKie]

There is a wrong check for rectangle containment - which will be corrected.

You can already now use the low-level API as a circumvention and do this doc.xref_set_key(page.xref, "CropBox", "[x0 y1 x1 y1]").

Please note that here you must use PDF geometry for the coordinates, which means point (x0, y0) specifies the lower-left and (x1, y1) the upper-right corner. Also observe that the desired value is contained in a string and must be provided exactly as shown. There also is no plausibility check, so this is on your own risk.

After the fix, a session changing the CropBox (and friends) may look like this:

import fitz
doc=fitz.open()
page=doc.new_page()
page.xref
4
# fake a MediaBox for demo purposes
doc.xref_set_key(4, "MediaBox", "[-30 -20 595 842]")

page.cropbox  # default: MediaBox, but in MuPDF geometry!
Rect(-30.0, 0.0, 595.0, 862.0)

page.rect  # equals th (shifted) CropBox : top-left = (0, 0)
Rect(0.0, 0.0, 625.0, 862.0)

# change the CropBox: shift by (10, 10) in both dimensions. Please note:
# To achieve this, 10 must be subtracted from 862! yo must never be negative!
page.set_cropbox(fitz.Rect(-20.0, 0.0, 595.0, 852.0))

# Confirm how page object looks like.
# Note the `-10` in the y0 coordinate.
print(doc.xref_object(4))
<<
  /Type /Page
  /MediaBox [ -30 -20 595 842 ]
  /Rotate 0
  /Resources 3 0 R
  /Parent 2 0 R
  /CropBox [ -20 -10 595 842 ]
>>
page.rect  # and also look at the page rectangle
Rect(0.0, 0.0, 615.0, 852.0)

[julian-smith-artifex-com]

Fixed in 1.23.7.