roguelike-game/src/visibility_system.rs

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2.4 KiB
Rust
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use rltk::{field_of_view, Point};
use specs::prelude::*;
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use crate::components::{Hidden, Name};
use crate::game_log::GameLog;
use crate::{Map, Player, Position, Viewshed};
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pub struct VisibilitySystem {}
impl<'a> System<'a> for VisibilitySystem {
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#[allow(clippy::type_complexity)]
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type SystemData = (
WriteExpect<'a, Map>,
Entities<'a>,
WriteStorage<'a, Viewshed>,
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ReadStorage<'a, Position>,
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ReadStorage<'a, Player>,
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WriteStorage<'a, Hidden>,
WriteExpect<'a, rltk::RandomNumberGenerator>,
WriteExpect<'a, GameLog>,
ReadStorage<'a, Name>,
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);
fn run(&mut self, data: Self::SystemData) {
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let (mut map, entities, mut viewshed, pos, player, mut hidden, mut rng, mut log, names) =
data;
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for (ent, viewshed, pos) in (&entities, &mut viewshed, &pos).join() {
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if viewshed.dirty {
viewshed.dirty = false;
viewshed.visible_tiles.clear();
viewshed.visible_tiles =
field_of_view(Point::new(pos.x, pos.y), viewshed.range, &*map);
viewshed
.visible_tiles
.retain(|p| p.x >= 0 && p.x < map.width && p.y >= 0 && p.y < map.height);
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// if this is the player, reveal what they can see
if let Some(_p) = player.get(ent) {
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for t in map.visible_tiles.iter_mut() {
*t = false
}
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for vis in viewshed.visible_tiles.iter() {
let idx = map.xy_idx(vis.x, vis.y);
map.revealed_tiles[idx] = true;
map.visible_tiles[idx] = true;
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// Chance to reveal hidden things
for e in map.tile_content[idx].iter() {
if let Some(_maybe_hidden) = hidden.get(*e) {
if rng.roll_dice(1, 24) == 1 {
if let Some(name) = names.get(*e) {
log.append(format!("You spotted a {}.", &name.name));
}
hidden.remove(*e);
}
}
}
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}
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}
}
}
}
}