39 lines
1.2 KiB
C++
39 lines
1.2 KiB
C++
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//
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// Cellgrid: stores sprites in a grid.
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//
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// To create a grid, just create an empty table.
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// In actual usage, the cellgrid will be stored in the registry
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// in the field "cellgrid_cells". If you pass grid=nil to
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// any of these routines, the system will automatically use
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// the table in the registry.
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//
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// For purposes of this module, a "sprite" is any table
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// having a metatable. The (X,Y,Z,Plane) of the sprite are
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// stored as hidden fields inside the metatable.
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//
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// We preserve the invariant that sprites whose plane is nil
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// are not stored in the grid. All sprites whose plane
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// is a string are stored in the grid.
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//
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// When creating a new sprite, initialize plane to nil. That
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// fits the invariant that sprites whose plane is nil are
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// not stored in the grid. If you ever want to change the
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// sprite's position, use cellgrid_setpos: that will
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// preserve the invariant.
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//
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#ifndef CELLGRID_HPP
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#define CELLGRID_HPP
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#include "luastack.hpp"
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int cellgrid_initgrid(lua_State *L);
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int cellgrid_addplane(lua_State *L);
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int cellgrid_setpos(lua_State *L);
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int cellgrid_scanradius(lua_State *L);
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int cellgrid_scanregion(lua_State *L);
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#endif // CELLGRID_HPP
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