Struct GridMeta 

pub struct GridMeta { /* private fields */ }

Implementations

impl GridMeta

pub const fn new(width: usize, height: usize) -> Self

pub fn check_dem<T>(&self, dem: &[T]) -> Result<()>

pub fn width(&self) -> usize

pub fn height(&self) -> usize

pub fn size(&self) -> usize

pub fn nshift(&self) -> &[isize; 8]

Offset from a focal cell’s index to its neighbours in terms of flat indexing

let arr = [
 1,2,3,
 0,x,4,
 7,6,5
];
for i in 0..8 {
    assert!(arr[(4 + meta.nshift()[i]) as usize] == i)
}

pub fn shift(&self, idx: usize, dir: u8) -> usize

Offset from a focal cell’s index to its neighbours in terms of flat indexing

let arr = [
 1,2,3,
 0,x,4,
 7,6,5
];
for i in 0..8 {
    assert!(arr[meta.shift(4,i)] == i)
}

pub const fn rev(n: usize) -> usize

Reverse the direction of nshift:

let arr = [
1,2,3,
0,x,4,
7,6,5,
];
for n in 0..8 {
  let rec_idx = (4+meta.nshift()[n]) as usize;
  let rec = arr[rec_idx];
  assert_eq!(rec, n);
  let _x = arr[(rec_idx as isize+meta.nshift()[GridMeta::rev(rec)]) as usize];
  assert_eq!(_x, x);
}

pub fn is_edge_cell(&self, x: usize, y: usize) -> bool

pub fn is_edge(&self, i: usize) -> bool

pub fn in_grid(&self, x: isize, y: isize) -> bool

pub fn i_to_xy(&self, i: usize) -> (usize, usize)

pub fn xy_to_i(&self, x: usize, y: usize) -> usize

Trait Implementations

impl Clone for GridMeta

fn clone(&self) -> GridMeta

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GridMeta

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for GridMeta