Rotation of presentation should be continuous

[Andrea Colangelo]

Currently you can rotate a presentation from the starting point to either +180° or -180°. Once arrived to {+,-}180°, you can't go further. Nevertheless, there could be several situations where one might need to go from the positive field to the negative one without needing to rotate all the way back. Therefore, A4 should allow to rotate the presentation in a continuous manner, transparently handling the flip from +180° to -180°.

[Andrea Gasparini (gaspa)]

Well, an animation between two arbitrary angles is done towards the minimum angle (think as clockwise or counterclockwise), so in this case is not really an issue.

About the spinbutton, I'd like to have a control into the canvas, let's say similar to googlemaps. so, I'd sign this as 'wont fix', but let's talk a little more ;)

[Andrea Colangelo (warp10)]

I consider it more than a user friendliness bug than a technical one. I agree it is not really an issue, it's rather the default behavior for that particular feature, but the user who is using A4 would probably disagree and isn't interested in techno-bubbles: he just consider the image as something he want to rotate, zoom and drag without restrictions.

Anyway, I agree that all this stuff should be handled with Cairo controls, and I agree to mark this as won't fix after a discussion that gathers other guys' opinion. :)

[Andrea Gualano (andrea-gualano)]

When editing it would make sense to rotate a +180° view further to get a -175° rotation, so the spinner should rollover when at the maximum (or minimum), like in a clock/calendar control.
Of course, if the spinner is going away then this is not a problem anymore.
I would keep the bug open until we get rid of the spinner, as a reminder.
If we decide to keep it after all, we'll have to fix this one.