Function floodTiles
Returns a range that iterates through tiles based on a flood filling algorithm.
Prototype
auto floodTiles(alias pred, T)( T grid, RowCol origin, Diagonals diags = Diagonals.no ) if (is(typeof(pred(grid.tileAt(RowCol(0, 0)))) : bool));
Parameters
| Name | Description |
|---|---|
| pred | predicate that returns true if the flood should progress through a given tile. |
| grid | grid to apply flood to. |
| origin | coordinate at which to begin flood. |
| diags | by default, flood only progresses to directly adjacent tiles. Diagonals.yes causes the flood to progress across diagonals too. |
Example
import std.array; import std.algorithm : equal; // let the 'X's represent 'walls', and the other letters 'open' areas we'd link to identify auto grid = rectGrid([ // 0 1 2 3 4 5 <-col| row [ 'X', 'X', 'X', 'X', 'X', 'X' ], // 0 [ 'X', 'a', 'a', 'X', 'b', 'X' ], // 1 [ 'X', 'a', 'a', 'X', 'b', 'X' ], // 2 [ 'X', 'X', 'X', 'X', 'X', 'c' ], // 3 [ 'd', 'd', 'd', 'X', 'c', 'X' ], // 4 [ 'd', 'd', 'd', 'X', 'X', 'X' ], // 5 ]); // starting on a wall should return an empty result assert(grid.floodTiles!(x => x == 'a')(RowCol(0,0)).empty); assert(grid.floodTiles!(x => x == 'a')(RowCol(3,3)).empty); // flood the 'a' room assert(grid.floodTiles!(x => x == 'a')(RowCol(1,1)).equal(['a', 'a', 'a', 'a'])); assert(grid.floodTiles!(x => x == 'a')(RowCol(1,2)).equal(['a', 'a', 'a', 'a'])); assert(grid.floodTiles!(x => x == 'a')(RowCol(2,1)).equal(['a', 'a', 'a', 'a'])); assert(grid.floodTiles!(x => x == 'a')(RowCol(2,2)).equal(['a', 'a', 'a', 'a'])); // flood the 'a' room, but asking for a 'b' assert(grid.floodTiles!(x => x == 'b')(RowCol(2,2)).empty); // flood the 'b' room assert(grid.floodTiles!(x => x == 'b')(RowCol(1,4)).equal(['b', 'b'])); // flood the 'c' room assert(grid.floodTiles!(x => x == 'c')(RowCol(4,4)).equal(['c'])); // flood the 'd' room assert(grid.floodTiles!(x => x == 'd')(RowCol(4,1)).equal(['d', 'd', 'd', 'd', 'd', 'd'])); // flood the 'b' and 'c' rooms, moving through diagonals assert(grid.floodTiles!(x => x == 'b' || x == 'c')(RowCol(4,4), Diagonals.yes) .equal(['c', 'c', 'b', 'b']));