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#!/usr/bin/env python
'''
usage: poster.py my.pdf
Shows how to change the size on a PDF.
Motivation:
My daughter needed to create a 48" x 36" poster, but her Mac version of Powerpoint
only wanted to output 8.5" x 11" for some reason.
'''
import sys
import os
import find_pdfrw
from pdfrw import PdfReader, PdfWriter, PdfDict, PdfName, PdfArray, IndirectPdfDict
from pdfrw.buildxobj import pagexobj
def adjust(page):
page = pagexobj(page)
assert page.BBox == [0, 0, 11 * 72, int(8.5 * 72)], page.BBox
margin = 72 // 2
old_x, old_y = page.BBox[2] - 2 * margin, page.BBox[3] - 2 * margin
new_x, new_y = 48 * 72, 36 * 72
ratio = 1.0 * new_x / old_x
assert ratio == 1.0 * new_y / old_y
index = '/BasePage'
x = -margin * ratio
y = -margin * ratio
stream = 'q %0.2f 0 0 %0.2f %s %s cm %s Do Q\n' % (ratio, ratio, x, y, index)
xobjdict = PdfDict()
xobjdict[index] = page
return PdfDict(
Type = PdfName.Page,
Contents = PdfDict(stream=stream),
MediaBox = PdfArray([0, 0, new_x, new_y]),
Resources = PdfDict(XObject = xobjdict),
)
def go(inpfn, outfn):
reader = PdfReader(inpfn)
page, = reader.pages
writer = PdfWriter()
writer.addpage(adjust(page))
writer.trailer.Info = IndirectPdfDict(reader.Info)
writer.write(outfn)
if __name__ == '__main__':
inpfn, = sys.argv[1:]
outfn = 'poster.' + os.path.basename(inpfn)
go(inpfn, outfn)
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