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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: scroll-down with pixel transition
Date: Mon, 10 Apr 2017 08:58:20 +0300
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To: Tak Kunihiro <tkk@misasa.okayama-u.ac.jp>
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	(message from Tak Kunihiro on Mon, 10 Apr 2017 08:49:59 +0900)
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> From: Tak Kunihiro <tkk@misasa.okayama-u.ac.jp>
> Date: Mon, 10 Apr 2017 08:49:59 +0900
> Cc: Kunihiro Tak <tkk@misasa.okayama-u.ac.jp>
> 
> I see scroll-up a line with pixel transition can be implemented
> by `set-window-vscroll' as shown below.
> 
> (progn
>   (vertical-motion 1)
>   (dolist (vs (number-sequence 1 (1- (frame-char-height))))
>     (set-window-vscroll nil vs t) (sit-for 0.001))
>   (scroll-up 1))
> 
> Do you have ideas to scroll-down with pixel transition?

Scroll down one line, then use set-window-vscroll to scroll up by
pixels?