roguelike-game/src/lighting_system.rs

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use ::rltk::Point;
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use ::specs::prelude::*;
use rltk::DistanceAlg;
use super::{LightSource, Map, Position, Viewshed};
use crate::colors;
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pub struct LightingSystem {}
impl<'a> System<'a> for LightingSystem {
#[allow(clippy::type_complexity)]
type SystemData = (
WriteExpect<'a, Map>,
ReadStorage<'a, Viewshed>,
ReadStorage<'a, Position>,
ReadStorage<'a, LightSource>,
);
fn run(&mut self, data: Self::SystemData) {
let (mut map, viewshed, positions, lighting) = data;
if map.outdoors {
return;
}
for l in map.light.iter_mut() {
*l = colors::BLACK;
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}
for (viewshed, pos, light) in (&viewshed, &positions, &lighting).join() {
let light_point = Point::from(*pos);
let range_f = light.range as f32;
for t in viewshed.visible_tiles.iter() {
if t.x > 0 && t.x < map.width && t.y > 0 && t.y < map.height {
let idx = map.xy_idx(t.x, t.y);
let distance = DistanceAlg::Pythagoras.distance2d(light_point, *t);
let intensity = (range_f - distance) / range_f;
map.light[idx] = map.light[idx] + (light.color * intensity);
}
}
}
}
}