Panoramax: Preserving direction and zoom

[danieldegroot2]

Description

Ref #9941 For 360 images mainly

• Preserving zoom when toggling high resolution is useful when reading text on signs and windows.
  Currently Panoramax resets the zoom, which breaks the user flow; the user has to zoom in again.
  (direction is already preserved when toggling high resolution.)
  Preserving zoom when toggling high resolution is already the case for Bing Streetside.

• Preserving direction and zoom when moving through the sequence can be useful for viewing the same object from multiple angles or when looking at multiple shop windows.
  -- Bing Streetside and Mapillary already do this. Panoramax does not.
  -- Of course, if you stay zoomed in you may end up looking at a wall, but then you can rotate or go one step back.
  -- Sometimes you have to manually zoom out if you decide you want to continue moving. However, I personally do not experience this as an issue as it is needed anyways.
  -- Sidenote: Bing Streetside seems to have a bug where it keeps preserving the zoomed in state eventhough I have zoomed out.

• Preserving direction (not zoom) between sequences is useful if there are at least two traces, one on each side of the street, or two traces on a junction of streets, one in each orthogonal direction.
  -- Mapillary already does this. Panoramax and Bing Streetside do not.

• Direction (not zoom) could also be preserved when switching between providers.

Chrome 127.0.6533.89 on Windows 10
2.30.0-dev

Screenshots

No response

[tyrasd]

@mattiapezzotti can you take a look at this when you have time?

I think it would be sufficient for now to preserve the view (yaw/pitch setting in panellum) and zoom (hfov setting in pannellum) when switching between photos of the same image provider. When switching between, for example, mapillary and panoramax, this might also be useful, but I think that would be quite a bit more effort to implement given the current structure of the code.