Zoom should be centered

[MickL]

Currently when zooming the page-scroll stays the same.
The expected behavior should be a centered zoom to the middle of the viewport. (Example: Google Maps)

A scrolling, according to viewport, needs to be added.

Initial situation:

Current behavior:

Expected behavior:

[Snuffleupagus]

The behaviour you describe is used when zooming is done with a mouse or trackpad (using
Ctrl+scroll wheel/trackpad).

A scrolling, according to viewport, needs to be added.

However, I do not agree that all zooming (e.g. with the toolbar buttons) should behave that way.
Compare with desktop PDF viewers such as e.g. Adobe Reader, which handles zooming similar to PDF.js.
In my opinion, this issue is won't fix.

[MickL]

To zoom to something specific the user has to do: zoom, scroll, zoom, scroll, ... which is very unhandy.

Similar "big" software that zooms into center on zoom-in-button click:

• Google Maps
• Apple Preview
• Microsoft Image Preview

All of them are much more frequently used than Adobe Reader which lead into the described expected behavior. Im pretty sure additional user-tests would confirm this.

[dasilvacontin]

I'm having this problem as well. Also, looking forward to adding mobile-zoom via pinch, it's necessary that pdf.js can zoom using any point as the zoom's center.

[Snuffleupagus]

Also, looking forward to adding mobile-zoom via pinch,

That's already tracked in issue #2582.

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Closing as WONTFIX, given the points mentioned in #7512 (comment).