How to create a camera effect?

Question

Algorithms

How is the focus effect on a character created in 2D games?
It's about your own engine. That is a pure framework for working with graphics
and that's it. It's easy to combine objects into one layer class, but how exactly should
the layer's coordinates change in response to character movement?

Answer 1

I have a translation for this.
The first part: https://habrahabr.ru/post/272933/
The second part: https://habrahabr.ru/post/273397/
It is about how to lead the character with the camera.