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find_scale(): better document why we use powers of 10

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Johannes Schauer Marin Rodrigues 2022-03-24 12:43:49 +01:00
parent 244f034a2e
commit 7c48bfb868
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 5 additions and 1 deletions
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src/img2pdf.py
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@ -2147,7 +2147,11 @@ def get_fixed_dpi_layout_fun(fixed_dpi):
def find_scale(pagewidth, pageheight):
"""Find the power of 10 (10, 100, 1000...) that will reduce the scale
below the PDF specification limit of 14400 PDF units (=200 inches)"""
below the PDF specification limit of 14400 PDF units (=200 inches).
In principle we could also choose a scale that is not a power of 10.
We use powers of 10 because numbers in the PDF format are represented
in base-10 and using powers of 10 will thus just shift the comma and
keep the numbers easily readable by humans as well."""
from math import log10, ceil
major = max(pagewidth, pageheight)