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Leaves mode (currently on) says about posibility to store 4 points inside each rectangle (not only the deepest).
Set a point on highlighted area below.
Simple GIFs creator made when I wanted to learn how are built .gif files formats
The algorithm with which you can easily perform the rasterization process
The structure able to store huge amount of points and able to return them from big area with an eficiency of O(log(n))
The structure that stores references to geometric figures (in current implementation only points)