This asset is no more supported.
Build with and for GMS 1.4. (But works with GMS2) Rotate the values on a grid Clockwise or Counterclockwise. Square or rectangle grids. Usefull to rotate room pattern or an entire dungeon when using data on a ds_grid.
ds_grid_rotate(Grid id, Clockwise, Rotation)
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The number of rotation is now 'moded' to keep it between 1 and 3.