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use std::collections::HashMap;
use rand::Rng;
use specs::{
VecStorage,
Component,
System,
World,
WorldExt,
Builder,
Join,
ReadStorage,
DispatcherBuilder,
Dispatcher,
Write,
EntityBuilder,
Entity
};
// Components
#[derive(Component, Debug, Hash, PartialEq, Eq, Clone, Copy)]
#[storage(VecStorage)]
struct Position {
x: i32,
y: i32
}
#[derive(Component, Debug, Clone)]
#[storage(VecStorage)]
struct Visible {
sprite: String,
height: f32
}
#[derive(Component, Debug)]
#[storage(VecStorage)]
struct InputController {
key: String
}
// Resources
#[derive(Default)]
struct Size (i32, i32);
#[derive(Default)]
struct TopView {
width: i32,
height: i32,
cells: HashMap<Position, Vec<Visible>>
}
// Systems
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(){
if pos.x >= 0 && pos.y >= 0 && pos.x < view.width && pos.y < view.height {
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());
}
}
}
}
// Higher level stuff
pub struct Room<'a, 'b> {
world: World,
dispatcher: Dispatcher<'a, 'b>,
spawn: (i32, i32),
players: HashMap<String, Entity>
}
impl <'a, 'b>Room<'a, 'b> {
pub fn new(size: (i32, i32)) -> Room<'a, 'b> {
let (width, height) = size;
let mut world = World::new();
world.register::<Position>();
world.register::<Visible>();
world.register::<InputController>();
world.insert(Size(width, height));
world.insert(TopView{width: width, height: height, cells: HashMap::new()});
let dispatcher = DispatcherBuilder::new()
.with(Draw, "draw", &[])
.build();
let mut room = Room {
world,
dispatcher,
spawn: (width / 2, height / 2),
players: HashMap::new()
};
gen_room(&mut room);
room
}
pub fn view(&self) -> (Vec<usize>, Vec<Vec<String>>) {
let tv = &*self.world.fetch::<TopView>();
let width = tv.width;
let height = tv.height;
let size = width * height;
let mut values :Vec<usize> = Vec::with_capacity(size as usize);
let mut mapping: Vec<Vec<String>> = Vec::with_capacity(size as usize);
for y in 0..height {
for x in 0..width {
let sprites: Vec<String> = match tv.cells.get(&Position{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)
}
pub fn update(&mut self) {
self.dispatcher.dispatch(&mut self.world);
self.world.maintain();
}
pub fn get_size(&self) -> (i32, i32) {
let Size(width, height) = *self.world.fetch::<Size>();
(width, height)
}
pub fn add_obj(&mut self, template: &dyn Assemblage, (x, y): (i32, i32)) -> Entity {
template.build(self.world.create_entity()).with(Position{x, y}).build()
}
pub fn add_player(&mut self, name: &str) {
let ent = self.add_obj(&Player::new(name), self.spawn);
self.players.insert(name.to_string(), ent);
}
pub fn remove_player(&mut self, name: &str){
// todo: proper error handling
let ent = self.players.remove(name).expect("unknown player name");
self.world.delete_entity(ent).expect("player in world does not have entity");
}
}
fn gen_room(room: &mut Room){
let (width, height) = room.get_size();
for x in 0..width {
room.add_obj(&Wall, (x, 0));
room.add_obj(&Wall, (x, height - 1));
}
for y in 1..height-1 {
room.add_obj(&Wall, (0, y));
room.add_obj(&Wall, (width - 1, y));
}
for x in 1..width-1 {
for y in 1..height-1 {
room.add_obj(&Grass::new(), (x, y));
}
}
}
pub trait Assemblage {
fn build<'a>(&self, builder: EntityBuilder<'a>) -> EntityBuilder<'a>;
}
// Entity types
struct Wall;
impl Assemblage for Wall {
fn build<'a>(&self, builder: EntityBuilder<'a>) -> EntityBuilder<'a>{
builder.with(Visible{sprite: "wall".to_string(), height: 2.0})
}
}
struct Grass {
sprite: String
}
impl Grass {
fn new() -> Grass {
Grass {
sprite: ["grass1", "grass2", "grass3", "grass1", "grass2", "grass3", "ground"][rand::thread_rng().gen_range(0,7)].to_string()
}
}
}
impl Assemblage for Grass {
fn build<'a>(&self, builder: EntityBuilder<'a>) -> EntityBuilder<'a>{
builder.with(Visible{sprite: self.sprite.to_string(), height: 0.1})
}
}
struct Player {
name: String
}
impl Player {
fn new(name: &str) -> Player {
Player { name: name.to_string()}
}
}
impl Assemblage for Player {
fn build<'a>(&self, builder: EntityBuilder<'a>) -> EntityBuilder<'a>{
builder.with(Visible{sprite: "player".to_string(), height: 1.0}).with(InputController{key: self.name.to_string()})
}
}
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