78 lines
2.5 KiB
Rust
78 lines
2.5 KiB
Rust
use std::collections::HashMap;
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use ::specs::prelude::*;
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use crate::components::{Chasing, EntityMoved, MyTurn, Position, Viewshed};
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use crate::{spatial, Map};
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pub struct ChaseAI {}
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impl<'a> System<'a> for ChaseAI {
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#[allow(clippy::type_complexity)]
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type SystemData = (
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WriteStorage<'a, MyTurn>,
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WriteStorage<'a, Chasing>,
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WriteStorage<'a, Position>,
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ReadExpect<'a, Map>,
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WriteStorage<'a, Viewshed>,
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WriteStorage<'a, EntityMoved>,
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Entities<'a>,
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);
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fn run(&mut self, data: Self::SystemData) {
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let (mut turns, mut chasing, mut positions, map, mut viewsheds, mut entity_moved, entities) =
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data;
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let mut targets: HashMap<Entity, (i32, i32)> = HashMap::new();
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let mut end_chase: Vec<Entity> = Vec::new();
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for (entity, _turn, chasing) in (&entities, &turns, &chasing).join() {
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if let Some(target_pos) = positions.get(chasing.target) {
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targets.insert(entity, (target_pos.x, target_pos.y));
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} else {
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end_chase.push(entity);
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}
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}
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for done in end_chase.iter() {
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chasing.remove(*done);
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}
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end_chase.clear();
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let mut turn_done: Vec<Entity> = Vec::new();
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for (entity, mut pos, _chase, mut viewshed, _myturn) in
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(&entities, &mut positions, &chasing, &mut viewsheds, &turns).join()
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{
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turn_done.push(entity);
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let target_pos = targets[&entity];
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let path = ::rltk::a_star_search(
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map.xy_idx(pos.x, pos.y) as i32,
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map.xy_idx(target_pos.0, target_pos.1) as i32,
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&*map,
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);
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if path.success && path.steps.len() > 1 && path.steps.len() < 15 {
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let idx = map.xy_idx(pos.x, pos.y);
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pos.x = path.steps[1] as i32 % map.width;
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pos.y = path.steps[1] as i32 / map.width;
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entity_moved
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.insert(entity, EntityMoved {})
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.expect("Unable to insert movement marker");
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let new_idx = map.xy_idx(pos.x, pos.y);
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viewshed.dirty = true;
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spatial::move_entity(entity, idx, new_idx);
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turn_done.push(entity);
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} else {
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end_chase.push(entity);
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}
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}
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for done in end_chase.iter() {
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chasing.remove(*done);
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}
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for done in turn_done.iter() {
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turns.remove(*done);
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}
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}
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}
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