I am looking for an open source Android library (or at least the best way to go) to help my users define a polygon (as easy as possible for them) over a photo and crop it. Features I would love to have:
- The user can define any corner independently.
- The user can drag the centre of any side of the polygon to change two of the corners at once.
- Some extra help, like a little 'magnifier', zooms the selected corner to help the user to be precise.
Very few of the libraries I've already checked allow features 1 or 2 out there.
I haven't seen feature 3 on any free library yet.
Scanbot and CamScanner are paid libraries that allow all these, but they are really expensive.
A short video showing the desired behaviour
Do you know any library (or mix of them) to get close to this? I would be even interested in a paid library at a reasonable price.
UPDATE
Someone downvoted this without any comment (that's rude and totally useless if I don't know what to improve). I've tried A LOT of libraries already, this is a summary of my main results (since the detailed list is huge):
- Many of the available libraries don't maintain the aspect-ratio of the cropped image, like Android-Image-Cropper or cropper, so I can forget about them right now.
- The ones that solve the previous problems, like AndroidScannerDemo or SmartCropper, could be a base point to develop myself what I need, but they are still not close enough. Just a little step forward between that and what I need would be great, IF IT EXISTS apart from the paid ones!
from Best alternatives to crop a photo defining a polygon
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