// grd and grd_col handling (i.e. map_lines in a metatable)

// mapgrd and mapgrd_col handling (i.e. map_lines in a metatable)

static int grd_get(lua_State *ls)

static int mapgrd_get(lua_State *ls)

static int grd_set(lua_State *ls)

static int mapgrd_set(lua_State *ls)

static char* grd_glyph(lua_State *ls, int &col, int &row)

static char* mapgrd_glyph(lua_State *ls, int &col, int &row)

static int grd_col_get(lua_State *ls)

static int mapgrd_col_get(lua_State *ls)

    char *gly = grd_glyph(ls, col, row);

    char *gly = mapgrd_glyph(ls, col, row);

static int grd_col_set(lua_State *ls)

static int mapgrd_col_set(lua_State *ls)

    char *gly = grd_glyph(ls, col, row);

    char *gly = mapgrd_glyph(ls, col, row);

        return (luaL_error(ls, "%s", "grd must be set to a single char."));

        return (luaL_error(ls, "%s", "mapgrd must be set to a single char."));

    // grd table

    // mapgrd table

    lua_pushcfunction(ls, grd_get);

    lua_pushcfunction(ls, mapgrd_get);

    lua_pushcfunction(ls, grd_set);

    lua_pushcfunction(ls, mapgrd_set);

    // grd col table

    // mapgrd col table

    lua_pushcfunction(ls, grd_col_get);

    lua_pushcfunction(ls, mapgrd_col_get);

    lua_pushcfunction(ls, grd_col_set);

    lua_pushcfunction(ls, mapgrd_col_set);

static int dgn_grd_table(lua_State *ls)

static int dgn_mapgrd_table(lua_State *ls)

{ "grd_table", dgn_grd_table },

{ "mapgrd_table", dgn_mapgrd_table },

   -- Convenience global variable, e.g. grd[x][y] = 'x'
   meta['grd'] = dgn.grd_table(map)

   -- Convenience global variable, e.g. mapgrd[x][y] = 'x'
   meta['mapgrd'] = dgn.mapgrd_table(map)

Additionally, the dgn module provides a global "grd" variable that

Additionally, the dgn module provides a global "mapgrd" variable that

 grd[1][1] = 'x'

 mapgrd[1][1] = 'x'

 grd[width()][height()] = "."

 mapgrd[width()][height()] = "."