133 lines
3.6 KiB
Rust
133 lines
3.6 KiB
Rust
use ::rltk::{Rltk, RGB};
|
|
use ::specs::prelude::*;
|
|
|
|
use crate::components::{ParticleLifetime, Position, Renderable};
|
|
|
|
pub fn update_particles(ecs: &mut World, ctx: &Rltk) {
|
|
let mut dead_particles: Vec<Entity> = Vec::new();
|
|
{
|
|
// Age out particles
|
|
let mut particles = ecs.write_storage::<ParticleLifetime>();
|
|
let entities = ecs.entities();
|
|
for (entity, mut particle) in (&entities, &mut particles).join() {
|
|
if let Some(animation) = &mut particle.animation {
|
|
animation.timer += ctx.frame_time_ms;
|
|
if animation.timer > animation.step_time
|
|
&& animation.current_step < animation.path.len() - 2
|
|
{
|
|
animation.current_step += 1;
|
|
|
|
if let Some(pos) = ecs.write_storage::<Position>().get_mut(entity) {
|
|
pos.x = animation.path[animation.current_step].x;
|
|
pos.y = animation.path[animation.current_step].y;
|
|
}
|
|
}
|
|
}
|
|
|
|
particle.lifetime_ms -= ctx.frame_time_ms;
|
|
|
|
if particle.lifetime_ms < 0.0 {
|
|
dead_particles.push(entity);
|
|
}
|
|
}
|
|
}
|
|
|
|
for dead in dead_particles.iter() {
|
|
ecs.delete_entity(*dead).expect("Particle will not die.");
|
|
}
|
|
}
|
|
|
|
struct ParticleRequest {
|
|
x: i32,
|
|
y: i32,
|
|
fg: RGB,
|
|
bg: RGB,
|
|
glyph: rltk::FontCharType,
|
|
lifetime: f32,
|
|
}
|
|
|
|
#[derive(Default)]
|
|
pub struct ParticleBuilder {
|
|
requests: Vec<ParticleRequest>,
|
|
}
|
|
|
|
impl ParticleBuilder {
|
|
pub fn new() -> ParticleBuilder {
|
|
ParticleBuilder::default()
|
|
}
|
|
|
|
pub fn request(
|
|
&mut self,
|
|
x: i32,
|
|
y: i32,
|
|
fg: RGB,
|
|
bg: RGB,
|
|
glyph: rltk::FontCharType,
|
|
lifetime: f32,
|
|
) {
|
|
self.requests.push(ParticleRequest {
|
|
x,
|
|
y,
|
|
fg,
|
|
bg,
|
|
glyph,
|
|
lifetime,
|
|
})
|
|
}
|
|
}
|
|
|
|
pub struct ParticleSpawnSystem {}
|
|
|
|
impl<'a> System<'a> for ParticleSpawnSystem {
|
|
#[allow(clippy::type_complexity)]
|
|
type SystemData = (
|
|
Entities<'a>,
|
|
WriteStorage<'a, Position>,
|
|
WriteStorage<'a, Renderable>,
|
|
WriteStorage<'a, ParticleLifetime>,
|
|
WriteExpect<'a, ParticleBuilder>,
|
|
);
|
|
|
|
fn run(&mut self, data: Self::SystemData) {
|
|
let (entities, mut positions, mut renderables, mut particles, mut particle_builder) = data;
|
|
|
|
for new_particle in particle_builder.requests.iter() {
|
|
let p = entities.create();
|
|
|
|
positions
|
|
.insert(
|
|
p,
|
|
Position {
|
|
x: new_particle.x,
|
|
y: new_particle.y,
|
|
},
|
|
)
|
|
.expect("Failed to insert Position of new particle");
|
|
|
|
renderables
|
|
.insert(
|
|
p,
|
|
Renderable {
|
|
fg: new_particle.fg,
|
|
bg: new_particle.bg,
|
|
glyph: new_particle.glyph,
|
|
render_order: 0,
|
|
},
|
|
)
|
|
.expect("Failed to insert Renderable of new particle");
|
|
|
|
particles
|
|
.insert(
|
|
p,
|
|
ParticleLifetime {
|
|
lifetime_ms: new_particle.lifetime,
|
|
animation: None,
|
|
},
|
|
)
|
|
.expect("Failed to insert Lifetime of new particle");
|
|
}
|
|
|
|
particle_builder.requests.clear();
|
|
}
|
|
}
|