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| Defining a tile hierarchy |
A tile-hierarchy is build inwards-out. First of all, all objects that
need to be tiled are given a tile (the leaf-tiles). Next, the
deepest-nested adjacent tiles that must have the same width or height
are connected to one another, etc. This is done using the tile->left, tile->above,
etc. behaviour. The creation messages are always sent to the leaf-tiles,
who create and maintain tiles higher in the hierarchy whenever needed.
<-tile