I've got an android app with a view of a diagram that can be dragged, rotated and scaled using pinch zoom and other similar gestures. Often times I find that I want to reset back to a canonical view of the diagram. Is there an agreed upon gesture for doing this besides just having a reset button? I was thinking double tapping, but I haven't seen it in other apps.
Double tap is the default for zooming back to normal in iOS. It works in photos, safari and a lot of other apps and is encouraged in the guidelines.
Material guidelines talk about it too:
A pinch, or two quick taps, allows users to zoom into and out of content.
I’m pretty sure it’s a standard expected behaviour for users by now.