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|
use std::collections::{HashMap, HashSet};
use specs::{
BitSet,
storage::ComponentEvent,
ReaderId,
World,
SystemData,
ReadStorage,
WriteStorage,
Read,
Write,
System,
Join
};
use super::super::pos::Pos;
use super::super::components::{Visible, Played, Position};
use super::super::resources::{Size, Output};
use super::super::worldmessages::{WorldMessage, WorldUpdate, FieldMessage};
#[derive(Default)]
pub struct View {
pos_reader_id: Option<ReaderId<ComponentEvent>>,
vis_reader_id: Option<ReaderId<ComponentEvent>>,
dirty: BitSet
}
impl <'a> System<'a> for View {
type SystemData = (ReadStorage<'a, Position>, ReadStorage<'a, Visible>, Read<'a, Size>, WriteStorage<'a, Played>, Write<'a, Output>);
fn run(&mut self, (positions, visible, size, mut players, mut output): Self::SystemData) {
let mut cells: HashMap<Pos, Vec<Visible>> = HashMap::new();
for (pos, vis) in (&positions, &visible).join(){
cells.entry(pos.pos).or_insert(Vec::new()).push(vis.clone());
cells.get_mut(&pos.pos).unwrap().sort_by(|a, b| b.height.partial_cmp(&a.height).unwrap());
}
let width = size.width;
let height = size.height;
let (values, mapping) = draw_room(cells.clone(), (width, height));
let field = WorldUpdate::Field(FieldMessage{
width,
height,
field: values,
mapping
});
self.dirty.clear();
{
let pos_events = positions.channel().read(self.pos_reader_id.as_mut().unwrap());
let vis_events = visible.channel().read(self.vis_reader_id.as_mut().unwrap());
let events = vec![pos_events, vis_events].into_iter().flatten();
for event in events {
match event {
ComponentEvent::Modified(id) | ComponentEvent::Inserted(id) | ComponentEvent::Removed(id) => {
self.dirty.add(*id);
}
};
}
}
let mut changed: HashSet<Pos> = HashSet::new();
for (pos, _) in (&positions, &self.dirty).join(){
changed.insert(pos.pos);
if let Some(prev) = pos.prev{
changed.insert(prev);
}
}
let has_changed: bool = changed.len() > 0;
let mut changes: Vec<(Pos, Vec<String>)> = Vec::new();
for pos in changed {
changes.push((pos, cells.get(&pos).unwrap_or(&Vec::new()).iter().map(|v| v.sprite.clone()).collect()));
}
let changed_msg = WorldUpdate::Change(changes);
output.output.clear();
for (mut player, pos) in (&mut players, &positions).join() {
let mut updates: Vec<WorldUpdate> = Vec::new();
if player.is_new {
updates.push(field.clone());
} else if has_changed {
updates.push(changed_msg.clone());
}
updates.push(WorldUpdate::Pos(pos.pos));
let message = WorldMessage{updates};
output.output.insert(player.name.clone(), message);
player.is_new = false;
}
}
fn setup(&mut self, world: &mut World) {
Self::SystemData::setup(world);
self.pos_reader_id = Some(
WriteStorage::<Position>::fetch(&world).register_reader()
);
self.vis_reader_id = Some(
WriteStorage::<Visible>::fetch(&world).register_reader()
);
}
}
fn draw_room(cells: HashMap<Pos, Vec<Visible>>, (width, height): (i32, i32)) -> (Vec<usize>, Vec<Vec<String>>){
let size = width * height;
let mut values :Vec<usize> = Vec::with_capacity(size as usize);
let mut mapping: Vec<Vec<String>> = Vec::new();
for y in 0..height {
for x in 0..width {
let sprites: Vec<String> = match cells.get(&Pos{x: x, y: y}) {
Some(sprites) => {sprites.iter().map(|v| v.sprite.clone()).collect()}
None => {vec![]}
};
values.push(
match mapping.iter().position(|x| x == &sprites) {
Some(index) => {
index
}
None => {
mapping.push(sprites);
mapping.len() - 1
}
}
)
}
}
(values, mapping)
}
|
