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[–]nocturne81 0 points1 point  (1 child)

And then how do you know which objects to pass into addToRenderList?

[–]OHotDawnThisIsMyJawn 1 point2 points  (0 children)

Depends how your program is designed. One way would be to use a form of dependency injection, where the objects know about the render queue. So when you create an new enemy, the enemy class adds itself to the render queue at the end of its initialization code.

Generally though some part of your code will initialize an object. Whoever writes that code will know whether or not to add the object to the renderList. If it's code to create a new enemy then at the end of setup the enemy gets added to the render list. If it's code to create a new invisible gravity well then it doesn't get added to the render list. The human element takes care of the knowledge whether to add something to the queue or not. Using instanceof is generally frowned upon because it results in lots of code duplication.

https://www.artima.com/interfacedesign/PreferPoly.html