Questions about rotations

[talamaska]

I find the behavior a bit confusing. So to clean the confusions I want to ask some important questions here, and eventually trigger some docs improvement.

Correct me if I'm wrong with these discoveries:

• transformation rotate - shows a button to rotate the image 90 degrees at a time/tap.
• rotation bottom bar shows only when rotateZ is included in the allowedTransformationList
• you can't transform by x and/or y only.
• rotationZ provides only +- 45 degrees rotation? Why? Shouldn't it be +-180?
• I'm able to pan and scale with 2 fingers touch gesture, why I'm not able to rotate the image freely again with the gesture/listener detector?

Suggestions:

• show the bottom bar when any rotationX, rotationY, rotationZ is included in the allowed transformations - I guess I can do that by creating a custom widget?
• be able to set min max o the rotation scale, accepting rads maybe?
• be able to rotate the image with fingers

[kekland]

Hey, sorry, I was away for a while and I'm back now. About the discoveries:

• RotateTransformation rotates the whole canvas by 90 degrees.
• Not too sure, this could've been altered by the addition of x/y rotations. I'll double-check soon
• Code-wise it's possible, as x/y rotations are Transformation.rotateX/rotateY. It could be a UI issue that's not showing the buttons. Note that on Material cropper there's no x/y rotations as perspective in Google Photos is handled differently
• rotationZ provides 45 degree angles because you can reach the other angles by using the 90-degree rotations. This is how it's done in iOS's Photos app
• I need to double-check, but when I was testing I couldn't able to rotate the image like that on my iPad. But this should be pretty simple to add

About the suggestions:

• Yes, that can be done with a custom widget. I'll think about making this a bit easier though
• Can be added by extending the controller, but that's a bit cumbersome. I think I'll add a big object with a lot of different parameters to tweak max/min scale, rotation, etc
• Will think about this. Probably can also be a customizable behavior