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use specs::{
ReadStorage,
Write,
System,
Join
};
use super::super::components::{
Position,
Visible
};
use super::super::resources::{
TopView
};
pub struct Draw;
impl <'a> System<'a> for Draw {
type SystemData = (ReadStorage<'a, Position>, ReadStorage<'a, Visible>, Write<'a, TopView>);
fn run(&mut self, (pos, vis, mut view): Self::SystemData) {
view.cells.clear();
for (pos, vis) in (&pos, &vis).join(){
view.cells.entry(*pos).or_insert(Vec::new()).push(vis.clone());
view.cells.get_mut(pos).unwrap().sort_by(|a, b| b.height.partial_cmp(&a.height).unwrap());
}
}
}
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