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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Exactly. If you want to scale your image for example from 32x32 pixels to 64x64, you have to at least increase width and height values. You apply scaler to your vector or elements in array and it all receives same transformation.
Also it doesn't check if doubling will cause int overflow.