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|
use std::collections::HashSet;
use specs::{
Entities,
ReadStorage,
WriteStorage,
Read,
System,
Join,
Write
};
use crate::{
Pos,
components::{
Controller,
Blocking,
Position,
Floor,
Moved,
Entered
},
controls::{
Control
},
resources::{
Size,
Ground
},
};
pub struct Move;
impl <'a> System<'a> for Move {
type SystemData = (
Entities<'a>,
ReadStorage<'a, Controller>,
WriteStorage<'a, Position>,
Read<'a, Size>,
ReadStorage<'a, Blocking>,
Write<'a, Ground>,
ReadStorage<'a, Floor>,
WriteStorage<'a, Moved>,
WriteStorage<'a, Entered>
);
fn run(&mut self, (entities, controllers, mut positions, size, blocking, mut ground, floor, mut moved, mut entered): Self::SystemData) {
moved.clear();
entered.clear();
for (ent, controller, mut pos) in (&entities, &controllers, &mut positions.restrict_mut()).join(){
match &controller.0 {
Control::Move(direction) => {
let newpos = (pos.get_unchecked().pos + direction.to_position()).clamp(Pos::new(0, 0), Pos::new(size.width - 1, size.height - 1));
let mut blocked = false;
let mut on_floor = false;
for ent in ground.cells.get(&newpos).unwrap_or(&HashSet::new()) {
if blocking.get(*ent).is_some(){
blocked = true;
break;
}
if floor.get(*ent).is_some(){
on_floor = true;
}
}
if !blocked && on_floor {
let mut pos_mut = pos.get_mut_unchecked();
moved.insert(ent, Moved{from: pos_mut.pos}).expect("can't insert Moved");
ground.cells.get_mut(&pos_mut.pos).unwrap().remove(&ent);
pos_mut.pos = newpos;
ground.cells.entry(newpos).or_insert_with(HashSet::new).insert(ent);
for ent in ground.cells.get(&newpos).unwrap() {
let _ = entered.insert(*ent, Entered);
}
}
}
_ => {}
}
}
}
}
|
