This is a tiny job as I don't want a working App with any sort of beginning, end or logic in between.
I just want the scratch off routine.
To show the routine working, scan or draw a fake lotto scratcher, draw a gray looking box over the prize area and make the box slowly appear to scratch away when a finger is rubbing over it to reveal the prize value below the gray box.
Here is an image of what it looks like:
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I've seen sample codes that do this but the trick is to tweak it so it has a natural look and feel like when you actually take a coin to a scratcher.
Again, it doesn't need to do anything like keep score or any logic at all...I just want the routine. Duplicate the gray box area over several spots of the screen like the example image and it would also be awesome if there was a scratching sound while the scratching happens.
That's it...a simple routine you might already have sitting around.
Just remember, it needs to look realistic.