120 lines
3.0 KiB
Rust
120 lines
3.0 KiB
Rust
use rltk::{Rltk, RGB};
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use specs::prelude::*;
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use crate::{ParticleLifetime, Position, Renderable};
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pub fn cull_dead_particles(ecs: &mut World, ctx: &Rltk) {
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let mut dead_particles: Vec<Entity> = Vec::new();
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{
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let mut particles = ecs.write_storage::<ParticleLifetime>();
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let entities = ecs.entities();
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for (entity, mut particle) in (&entities, &mut particles).join() {
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particle.lifetime_ms -= ctx.frame_time_ms;
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if particle.lifetime_ms < 0. {
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dead_particles.push(entity);
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}
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}
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}
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for dead_particle in dead_particles.iter() {
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ecs.delete_entity(*dead_particle)
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.expect("Particle will not die");
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}
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}
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struct ParticleRequest {
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x: i32,
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y: i32,
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fg: RGB,
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bg: RGB,
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glyph: rltk::FontCharType,
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lifetime: f32,
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}
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pub struct ParticleBuilder {
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requests: Vec<ParticleRequest>,
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}
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impl ParticleBuilder {
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pub fn new() -> ParticleBuilder {
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ParticleBuilder {
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requests: Vec::new(),
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}
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}
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pub fn request(
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&mut self,
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x: i32,
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y: i32,
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fg: RGB,
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bg: RGB,
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glyph: rltk::FontCharType,
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lifetime: f32,
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) {
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self.requests.push(ParticleRequest {
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x,
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y,
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fg,
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bg,
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glyph,
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lifetime,
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});
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}
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}
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pub struct ParticleSpawnSystem {}
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impl<'a> System<'a> for ParticleSpawnSystem {
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type SystemData = (
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Entities<'a>,
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WriteStorage<'a, Position>,
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WriteStorage<'a, Renderable>,
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WriteStorage<'a, ParticleLifetime>,
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WriteExpect<'a, ParticleBuilder>,
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);
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fn run(&mut self, data: Self::SystemData) {
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let (
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entities,
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mut positions,
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mut renderables,
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mut particle_lifetimes,
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mut particle_builder,
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) = data;
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for new_particle in particle_builder.requests.iter() {
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let p = entities.create();
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positions
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.insert(
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p,
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Position {
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x: new_particle.x,
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y: new_particle.y,
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},
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)
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.expect("Unable to insert position");
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renderables
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.insert(
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p,
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Renderable {
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fg: new_particle.fg,
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bg: new_particle.bg,
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glyph: new_particle.glyph,
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render_order: 0,
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},
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)
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.expect("Unable to insert renderable");
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particle_lifetimes
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.insert(
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p,
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ParticleLifetime {
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lifetime_ms: new_particle.lifetime,
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},
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)
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.expect("Unable to insert particle lifetime");
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}
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particle_builder.requests.clear();
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}
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}
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