Unity2D_Grids

This is what we use to access the contents of a particular cell. In general, a point can be anything. The built-in grids, however, are all accessed through grid points that look like integer coordinates. The coordinates of uniform grids work like vectors: you can add and subtract them, and scale them up or down (multiply or divide by an integer).The coordinates of spliced grids have two parts: a vector part (based on the base grid), and an index part, indicating the particular slice. We call these coordinates spliced vectors, and they follow a simple algebra. Below, N is the splice count, the number of cells each base cell grid has been spliced into.[x0, y0, i0] + [x1, y1] = [x0 + x1, y0 + y1, i0][x0, y0, i0] – [x1, y1] = [x0 - x1, y0 - y1, i0][x0, y0, i0] + [x1, y1, i1] = [x0 + x1, y0 + y1, (i0 + i1) % N][x0, y0, i0] – [x1, y1, i1] = [x0 - x1, y0 - y1, (i0 - i1) % N]

A map is the thing that converts between Unity coordinates, and grid coordinates. Grids themselves do not know where they are in the Unity world. They only know which cells are inside them or not, and how cells relate to each other (being neighbors, for instance). The missing information is provided by maps. Keeping this information separate is extremely useful. For instance, hex grids and brick grids are topologically equivalent, which is a fancy way of saying their cells have the same neighbor relationships. They merely differ in the shape of the cells, and hence, how world and grid points map from one to the other. This means we can use the same grid, but different maps for the two.Maps are where the real power lies in the Grids library. They make it possible to do unusual things with grids that are not very easy with more rigid designs, including implementing pseudo irregular-grids, animating cells, transforming grids, and many more.Maps support index syntax. If you feed it a Unity vector, it gives you back a grid point; if you feed it a grid point, it gives you a unity vector.Maps supports several operations, including transformations, alignment functions, and anchoring functions. For a bit more detail, see Working with Maps.

You may see some of these classes in the folders with grids, points and vectors, and wonder what they are. These are behind-the-scene classes that implement the shape building technology for grids. For the most part, you do not need to know what these are unless you implement your own grids with shape building technology. They are the intermediary results of shape-building expressions like these:C#1234567PointyHexGrid<int> grid = PointyHexGrid .BeginShape() .Hexagon(5) .Translate(2, 2) .Union() .Hexagon(5) .EndShape();See Constructing Grids for more details on how to use these shape building functions.