84 lines
2.3 KiB
Rust
84 lines
2.3 KiB
Rust
//! Remove unreachable areas from the map.
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//!
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//! This modifier reiquires starting position on the map.
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//! It will add wall on every tile which is not accessible from the starting point.
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//!
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use std::marker::PhantomData;
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use crate::dijkstra::DijkstraMap;
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use crate::MapFilter;
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use crate::{Map, Tile};
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use rand::prelude::StdRng;
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/// Remove unreachable areas from the map.
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pub struct CullUnreachable<D> {
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phantom: PhantomData<D>,
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}
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impl<D: Clone + Default> MapFilter<D> for CullUnreachable<D> {
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fn modify_map(&self, _: &mut StdRng, map: &Map<D>) -> Map<D> {
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self.build(map)
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}
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}
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impl<D: Clone + Default> CullUnreachable<D> {
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#[allow(dead_code)]
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pub fn new() -> Box<CullUnreachable<D>> {
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Box::new(CullUnreachable {
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phantom: PhantomData,
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})
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}
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fn build(&self, map: &Map<D>) -> Map<D> {
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let mut new_map = map.clone();
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let dijkstra_map = DijkstraMap::new(map);
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for (i, tile) in new_map.tiles.iter_mut().enumerate() {
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if tile.is_walkable() {
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let distance_to_start = dijkstra_map.tiles[i];
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// We can't get to this tile - so we'll make it a wall
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if distance_to_start == std::f32::MAX {
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*tile = Tile::wall();
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}
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}
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}
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new_map
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}
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}
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/// ------------------------------------------------------------------------------------------------
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/// Module unit tests
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/// ------------------------------------------------------------------------------------------------
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#[cfg(test)]
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mod tests {
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use super::MapFilter;
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use super::*;
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use crate::geometry::Point;
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use crate::map::{Map, NoData};
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use rand::prelude::*;
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#[test]
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fn test_culling() {
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let map_str = "
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##########
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# # #
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##########
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";
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let mut map = Map::<NoData>::from_string(map_str);
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map.starting_point = Some(Point::new(9, 1));
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let expected_map_str = "
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##########
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#### #
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##########
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";
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let expected_map = Map::<NoData>::from_string(expected_map_str);
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let modifier = CullUnreachable::new();
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let mut rng = StdRng::seed_from_u64(0);
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let new_map = modifier.modify_map(&mut rng, &map);
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assert_eq!(new_map.tiles, expected_map.tiles);
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}
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}
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