use std::cmp; use crate::{relative_from_absolute_position, Position}; pub const MAX_DISTANCE: u32 = 4; pub fn index_proximity(lhs: u32, rhs: u32) -> u32 { if lhs <= rhs { cmp::min(rhs - lhs, MAX_DISTANCE) } else { cmp::min((lhs - rhs) + 1, MAX_DISTANCE) } } pub fn positions_proximity(lhs: Position, rhs: Position) -> u32 { let (lhs_attr, lhs_index) = relative_from_absolute_position(lhs); let (rhs_attr, rhs_index) = relative_from_absolute_position(rhs); if lhs_attr != rhs_attr { MAX_DISTANCE } else { index_proximity(lhs_index as u32, rhs_index as u32) } } pub fn path_proximity(path: &[Position]) -> u32 { path.windows(2).map(|w| positions_proximity(w[0], w[1])).sum::() }