Struct NeighborGrid 

pub struct NeighborGrid { /* private fields */ }

Per-tick neighbour grid for the crowd models.

Typical usage:

let mut grid = NeighborGrid::new(1.0);
for _step in 0..num_steps {
    grid.rebuild(&peds);
    social_force::step_with_grid(&mut peds, &walls, &params, dt, &grid);
}

Implementations

impl NeighborGrid

pub fn new(cell_size: f64) -> Self

Construct a grid with the given cell size (metres).

Choose cell_size close to the dominant model cutoff — e.g. 1.0 m for Social Force with default b_ped, 3.0 m for Optimal Steps with default ped_range, or the output of recommended_cell_size.

Panics

Panics if cell_size is not strictly positive.

pub fn clear(&mut self)

Drop every entry.

pub fn rebuild(&mut self, peds: &[Pedestrian])

Clear the grid and re-insert every pedestrian keyed by its slice index cast to u64.

pub fn for_each_neighbor<F>( &self, i: usize, radius: f64, peds: &[Pedestrian], f: F, )

where F: FnMut(usize, &Pedestrian),

Invoke f(j, pos_j, ped_j) for every pedestrian within radius of pos_i, skipping index i.

peds must be the same slice that was passed to rebuild; the grid stores only indices and positions, so the caller provides the slice for the actual pedestrian record lookup.

pub fn inner(&self) -> &UniformGrid2

Underlying grid, for diagnostics or custom queries.

Trait Implementations

impl Clone for NeighborGrid

fn clone(&self) -> NeighborGrid

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NeighborGrid

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

Formats the value using the given formatter.