MobileRead Forums - View Single Post - k2pdfopt: optimizes PDFs for viewing on e-readers

Kuang-che Wu · 02-02-2017, 10:41 PM

Feature request for vertical Chinese text.

I know k2pdfopt has option -r (right-to-left), but it is slightly different to what I need.
The default text ordering (for English-like languages) is

Code:

1 2 3
4 5 6
7 8 9

What -r can handle is character right-to-left, line top-to-down

Code:

3 2 1
6 5 4
9 8 7

But for vertical Chinese, the text ordering is character top-to-down, line right to left,

Code:

7 4 1
8 5 2
9 6 3

If applying -r to vertical Chinese text, it may cut text incorrectly. For example,

Code:

7 4 1
8 5 2

Currently, my workaround is -rt 90 -ls. That is, use "-rt 90" to preserve correct text layout analysis and use "-ls" for correct page size. But after k2pdfopt finish, I have to use other utility to rotate the result pdf 180 degree.

p.s. Vertical and horizontal Chinese writing systems are both in use. Usually books with many English text use horizontal Chinese (characters left-to-right, line top-to-down). Literature and novel use vertical Chinese (character top-to-down, line right-to-left).

02-02-2017, 10:41 PM	#1353
Kuang-che Wu Junior Member Posts: 4 Karma: 29176 Join Date: Jan 2017 Device: kindle paperwhite2	Feature request: vertical text Feature request for vertical Chinese text. I know k2pdfopt has option -r (right-to-left), but it is slightly different to what I need. The default text ordering (for English-like languages) is Code: 1 2 3 4 5 6 7 8 9 What -r can handle is character right-to-left, line top-to-down Code: 3 2 1 6 5 4 9 8 7 But for vertical Chinese, the text ordering is character top-to-down, line right to left, Code: 7 4 1 8 5 2 9 6 3 If applying -r to vertical Chinese text, it may cut text incorrectly. For example, Code: 7 4 1 8 5 2 Currently, my workaround is -rt 90 -ls. That is, use "-rt 90" to preserve correct text layout analysis and use "-ls" for correct page size. But after k2pdfopt finish, I have to use other utility to rotate the result pdf 180 degree. p.s. Vertical and horizontal Chinese writing systems are both in use. Usually books with many English text use horizontal Chinese (characters left-to-right, line top-to-down). Literature and novel use vertical Chinese (character top-to-down, line right-to-left).