When ever i try looking for a way of performing a zooming in and out function for a game i could never really find one. So pretty much a long time ago when was working on my own smash bros-like game called zero-caliber and i came up with a way of zooming in and out if anyone is interested. It took me a while to find it due to how messy my event editor was back then. Not sure if this will be of any use to anyone but here.
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good luck making since of it. I plan on remaking it for my new game somehow but i still though i should post it. all i can tell from it really is that i used the view port object having it the same size as the application window, and have it placed into the center of the frame ( [aligned in center],0 ). the rest is written in the mfa. file.
with it i was able to zoom in and out based on the size of the frame. When ever i passed the border it's just an infinite black.
( ohh yea one more thing, you move with the arrow keys, and jump and do other action with the [numeric 1] jump [numeric 2] attack. you can hop below platforms by pressing down twice.)
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some pictures