Das Grid

Das Grid is a 2D grid library which serves as fundamental building block for any 2D game built on the concept of grid

Famous games built on 2d grid concept:

• Draughts/Checkers
• Chess
• Scrabble
• Tetris
• Bejeweled
• Shinning Force (while battle)

Das Grid offers:

• Generic grid type, you can use any type you want to be the grid cell
• Helpers to make easy the move of values inside the grid
• Based on 2D top/left to bottom/right concept (which can be updated in the future)

Using Das Grid

Also, check the documentation at docs.rs/das-grid/0.1.4/das_grid

Creating the grid

// Creates a 10x10 grid with 0 as default value for each cell
let mut g = das_grid::Grid::new(10, 10, 0);

// Set the the value 1 at position x: 5 and y: 5
g.set((5, 5), &1);

Bring your own type

// Using &str instead of i32
let mut g: das_grid::Grid<&str> = das_grid::Grid::new(10, 10, "a");
g.get((0, 0)).unwrap(); // ouputs: "a"

extern crate das_grid;

// Your own enum, much better to track grid values
#[derive(Clone, Copy, PartialEq, Eq)]
enum Pawn {
    None,
    Player,
}

impl std::fmt::Display for Pawn {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        match *self {
            Pawn::None => write!(f, "None"),
            Pawn::Player => write!(f, "Player"),
        }
    }
}

fn main() -> Result<(), das_grid::GridErr> {
    // Initialize empty grid
    let mut g: das_grid::Grid<Pawn> = das_grid::Grid::new(8, 8, Pawn::None);

    // Set the Player on position 5,5
    g.set((5, 5), &Pawn::Player)?;

    println!("Grid initial state {:?}", g);

    // Move the player to right
    if let Ok(()) = g.mov_to((5, 5), das_grid::MoveDirection::Right) {
        // "The pawn on 5,6 is Player"
        println!("The pawn on 5,6 is {}", g.get((6, 5)).unwrap());
    }

    println!("Grid initial end state {:?}", g);

    Ok(())
}

The mov_to function can returns Result<(), OutOfGridErr> if the attept of move is out of the bounds of the grid

Example

To build and run an example:

cargo run --example custom_values

# Output

# Initial state Grid { rows: 2, cols: 2, cells: [
#  Player (x: 0 y: 0) None (x: 0 y: 1)
#  None   (x: 1 y: 0) None (x: 1 y: 1)
# ] }
#
# The pawn on 0, 1 is Player
#
# End state Grid { rows: 2, cols: 2, cells: [
#  None (x: 0 y: 0) Player (x: 0 y: 1)
#  None (x: 1 y: 0) None   (x: 1 y: 1)
# ] }

Moving cells

Each tile of the grid is called cell and each cell is the type that you want, because it is a 2D structure each cell has an address which consists of X and Y

// Creates a 5x5 grid with 0 as default value for each cell
let mut g = das_grid::Grid::new(5, 5, 0);

// Print with special {:?} to see the contents of the grid
println!("{:?}", g);
// outputs:
// Grid { rows: 5, cols: 5, cells: [
//  0 (x: 0 y: 0) 0 (x: 1 y: 0) 0 (x: 2 y: 0) 0 (x: 3 y: 0) 0 (x: 4 y: 0)
//  0 (x: 0 y: 1) 0 (x: 1 y: 1) 0 (x: 2 y: 1) 0 (x: 3 y: 1) 0 (x: 4 y: 1)
//  0 (x: 0 y: 2) 0 (x: 1 y: 2) 0 (x: 2 y: 2) 0 (x: 3 y: 2) 0 (x: 4 y: 2)
//  0 (x: 0 y: 3) 0 (x: 1 y: 3) 0 (x: 2 y: 3) 0 (x: 3 y: 3) 0 (x: 4 y: 3)
//  0 (x: 0 y: 4) 0 (x: 1 y: 4) 0 (x: 2 y: 4) 0 (x: 3 y: 4) 0 (x: 4 y: 4)
// ] }

As explained before to move cells you can call the function mov_to and pass the origin and destiny as a direction

The directions can be Left, Right, Top, Down:

• DasGrid::MoveDirection::Left, translates to (-1, 0)
• DasGrid::MoveDirection::Right, translates to (1, 0)
• DasGrid::MoveDirection::Top, translates to (0, -1)
• DasGrid::MoveDirection::Down, translates to (0, 1)

The mov_to function can returns Result<(), OutOfGridErr> if the attept of move is out of the bounds of the grid

Iterators

The grid has implemented few iterators that can be very handy on daily usage:

Iterating over the flatten grid structure

let grid: DasGrid<i32> = DasGrid::new(2, 2, 0);
let mut result: Vec<i32> = vec![];
for v in &grid {
    println!("Value {}", value);
}
assert!(result == [0, 0, 0, 0]);

Iterating over the enumerate of X and Y

let mut grid: DasGrid<i32> = DasGrid::new(2, 2, 0);
// Returns the X and Y as tuple
for (x, y) in grid.enumerate() {
    println!("X {} Y {}", x, y);
}

License

MIT License

Copyright (c) 2021 Eduardo Pereira

Permission is hereby granted, free of charge, to any person obtaining a copy
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The above copyright notice and this permission notice shall be included in all
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