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|
use rand;
use specs::{
ReadStorage,
WriteStorage,
Entities,
System,
Join,
Write,
Read
};
use crate::{
components::{
Position,
Grow,
Removed
},
resources::{NewEntities, Time}
};
pub struct Growth;
impl <'a> System<'a> for Growth{
type SystemData = (
Entities<'a>,
ReadStorage<'a, Position>,
Write<'a, NewEntities>,
WriteStorage<'a, Grow>,
WriteStorage<'a, Removed>,
Read<'a, Time>
);
fn run(&mut self, (entities, positions, mut new, mut grows, mut removeds, time): Self::SystemData) {
for (entity, position, grow) in (&entities, &positions, &mut grows).join(){
if grow.target_time == None {
let duration = grow.delay as f64 * (1.0 + rand::random::<f64>()) / (if rand::random() {1.0} else {2.0});
grow.target_time = Some(time.time + duration as i64);
}
if grow.target_time.unwrap() <= time.time {
removeds.insert(entity, Removed).unwrap();
// todo: error handling
new.create(position.pos, grow.into.clone()).unwrap();
}
}
}
}
|
