Odd/Even page snap

[Archomp]

I notice something when reading in double page; the pages are not "snapping" to proper location.

Okay, let me explain!
In Japanese books, chapters always begin on the left side of the spread, as in page 1 is on the left side.
(Which is the opposite of western books, because we read from left to right.)
Also, the first "spread" are always a single odd page (page 1 + an empty page or a page from the previous chapter)
See this diagram I made using paint

Problem arises when there are spreads with a specific "story-flow" or simply a spread page which the uploader didn't merge into one.

This is what the current Mangadex is doing right now.

Spoiler

This what the double page reader should be doing

Spoiler

The first page is a single page(or maybe showing the last page of previous chapter), and the next 2 pages are a single spread

Solution, just add an option to make odd pages, or even pages go first ('Odd page first' makes odd pages on the left side if reading right to left / makes odd pages on the right side if reading left to right)

I know this is NOT a huge problem, but I like reading mangas as close as it should be read irl, like an actual book.
Lastly, sorry for english.

 

[Plykiya]

@Archomp MangaDex can't really predict whether or not the pages belong together or whether it starts odd or even. There's a chance that a group will add their credits page either before or after the chapter, or not even have one at all. Could even have multiple pages of credits, not something we can know. If the pages are combined together into one wide double-spread page, the reader will detect it and display it together. Otherwise there's no way to reliably predict odd/even pages. You can turn by one page if you hold shift and click left or right when you see that it's off, or you can click the page bar with your mouse.

 

[Teasday]

As someone who mainly uses the double page mode myself I'm fully aware of the problem, but like Plykiya said, this isn't predictable. The only fully reliable way would be to ask uploaders to mark every page as left/right/either, which is kind of unreasonable to ask. We could add an optional flag to mark the first page of the chapter as odd or even, but some problems may still exist: for example, a group may have a horizontal credits page that gets detected as a double spread and thus throw off the whole chapter regardless of the flag, or there may be pages skipped or forgotten that again mess things up.

The simplest solution that I found was to allow the reader to fix the offset by themselves, by shifting by a single page at a time or to jumping to a specific page.
In double page mode, you can shift by a single page by:
- shift + left/right/a/d key
- the page arrows at the bottom of the sidebar
You can jump to a specific page by:
- using the pagebar
- inputting a page number after clicking the "Page x / y" area at the bottom of the sidebar