roguelike-game/src/visibility_system.rs
2022-02-01 10:39:46 -05:00

84 lines
3.0 KiB
Rust

use ::rltk::{field_of_view, Point, RandomNumberGenerator};
use ::specs::prelude::*;
use crate::components::{BlocksVisibility, Hidden, Name};
use crate::{colors, gamelog, spatial, Map, Player, Position, Viewshed};
pub struct VisibilitySystem {}
impl<'a> System<'a> for VisibilitySystem {
#[allow(clippy::type_complexity)]
type SystemData = (
WriteExpect<'a, Map>,
Entities<'a>,
WriteStorage<'a, Viewshed>,
ReadStorage<'a, Position>,
ReadStorage<'a, Player>,
WriteStorage<'a, Hidden>,
WriteExpect<'a, RandomNumberGenerator>,
ReadStorage<'a, Name>,
ReadStorage<'a, BlocksVisibility>,
);
fn run(&mut self, data: Self::SystemData) {
let (
mut map,
entities,
mut viewshed,
pos,
player,
mut hidden,
mut rng,
names,
blocks_visibility,
) = data;
map.view_blocked.clear();
for (block_pos, _block) in (&pos, &blocks_visibility).join() {
let idx = map.xy_idx(block_pos.x, block_pos.y);
map.view_blocked.insert(idx);
}
for (ent, viewshed, pos) in (&entities, &mut viewshed, &pos).join() {
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);
// if this is the player, reveal what they can see
if player.get(ent).is_some() {
for t in map.visible_tiles.iter_mut() {
*t = false
}
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;
// Chance to reveal hidden things
spatial::for_each_tile_content(idx, |e| {
let maybe_hidden = hidden.get(e);
if let Some(_maybe_hidden) = maybe_hidden {
if rng.roll_dice(1, 24) == 1 {
let name = names.get(e);
if let Some(name) = name {
gamelog::line("You spotted:")
.append_color(colors::RED, &name.name)
.log();
}
hidden.remove(e);
}
}
});
}
}
}
}
}
}