63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
use super::{Bystander, EntityMoved, Map, Position, TakingTurn, Viewshed};
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use specs::prelude::*;
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pub struct BystanderAI {}
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impl<'a> System<'a> for BystanderAI {
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#[allow(clippy::type_complexity)]
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type SystemData = (
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WriteExpect<'a, Map>,
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Entities<'a>,
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WriteStorage<'a, Viewshed>,
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ReadStorage<'a, Bystander>,
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WriteStorage<'a, Position>,
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WriteStorage<'a, EntityMoved>,
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WriteExpect<'a, rltk::RandomNumberGenerator>,
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ReadStorage<'a, TakingTurn>,
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);
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fn run(&mut self, data: Self::SystemData) {
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let (mut map, entities, mut viewshed, bystander, mut position, mut entity_moved, mut rng, turns) = data;
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for (entity, mut viewshed, _bystander, mut pos, _turn) in
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(&entities, &mut viewshed, &bystander, &mut position, &turns).join()
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{
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if try_move_randomly(&mut pos, &mut rng, &mut map, &mut viewshed) {
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entity_moved.insert(entity, EntityMoved {}).expect("Unable to insert marker");
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}
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}
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}
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}
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pub fn try_move_randomly(
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pos: &mut Position,
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rng: &mut rltk::RandomNumberGenerator,
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map: &mut Map,
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viewshed: &mut Viewshed,
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) -> bool {
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// Try to move randomly
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let mut x = pos.x;
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let mut y = pos.y;
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let move_roll = rng.roll_dice(1, 8);
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match move_roll {
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1 => x -= 1,
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2 => x += 1,
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3 => y -= 1,
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4 => y += 1,
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_ => {}
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}
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if x > 0 && x < map.width - 1 && y > 0 && y < map.height - 1 {
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let dest_idx = map.xy_idx(x, y);
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if !map.blocked[dest_idx] {
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let idx = map.xy_idx(pos.x, pos.y);
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map.blocked[idx] = false;
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pos.x = x;
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pos.y = y;
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map.blocked[dest_idx] = true;
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viewshed.dirty = true;
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return true;
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}
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}
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return false;
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}
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