Finish chapter 2.1

This commit is contained in:
Timothy Warren 2021-10-21 14:24:40 -04:00
parent 6f65bf2420
commit 59a791de56
2 changed files with 81 additions and 1 deletions

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@ -1,6 +1,7 @@
[package]
name = "roguelike_tutorial"
version = "0.1.0"
rust-version = "1.56"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

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@ -16,14 +16,77 @@ struct Renderable {
bg: RGB,
}
#[derive(Component)]
struct LeftMover {}
#[derive(Component, Debug)]
struct Player {}
struct State {
ecs: World,
}
fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
let mut positions = ecs.write_storage::<Position>();
let mut players = ecs.write_storage::<Player>();
for (_player, pos) in (&mut players, &mut positions).join() {
pos.x = min(79, max(0, pos.x + delta_x));
pos.y = min(49, max(0, pos.y + delta_y));
}
}
fn player_input(gs: &mut State, ctx: &mut Rltk) {
// Player movement
match ctx.key {
None => {} // Nothing happened
Some(key) => match key {
VirtualKeyCode::Left => try_move_player(-1, 0, &mut gs.ecs),
VirtualKeyCode::Right => try_move_player(1, 0, &mut gs.ecs),
VirtualKeyCode::Up => try_move_player(0, -1, &mut gs.ecs),
VirtualKeyCode::Down => try_move_player(0, 1, &mut gs.ecs),
_ => {},
},
}
}
impl GameState for State {
fn tick(&mut self, ctx: &mut Rltk) {
ctx.cls();
ctx.print(1, 1, "Hello Rust World");
player_input(self, ctx);
self.run_systems();
let positions = self.ecs.read_storage::<Position>();
let renderables = self.ecs.read_storage::<Renderable>();
for (pos, render) in (&positions, &renderables).join() {
ctx.set(pos.x, pos.y, render.fg, render.bg, render.glyph);
}
}
}
struct LeftWalker {}
impl<'a> System<'a> for LeftWalker {
type SystemData = (ReadStorage<'a, LeftMover>, WriteStorage<'a, Position>);
fn run(&mut self, (lefty, mut pos): Self::SystemData) {
for (_lefty, pos) in (&lefty, &mut pos).join() {
pos.x -= 1;
if pos.x < 0 {
pos.x = 79;
}
}
}
}
impl State {
fn run_systems(&mut self) {
let mut lw = LeftWalker{};
lw.run_now(&self.ecs);
self.ecs.maintain();
}
}
@ -38,6 +101,8 @@ fn main() -> rltk::BError {
gs.ecs.register::<Position>();
gs.ecs.register::<Renderable>();
gs.ecs.register::<LeftMover>();
gs.ecs.register::<Player>();
gs.ecs
.create_entity()
@ -47,7 +112,21 @@ fn main() -> rltk::BError {
fg: RGB::named(rltk::YELLOW),
bg: RGB::named(rltk::BLACK),
})
.with(Player {})
.build();
for i in 0..10 {
gs.ecs
.create_entity()
.with(Position { x: i * 7, y: 20 })
.with(Renderable {
glyph: rltk::to_cp437('☺'),
fg: RGB::named(rltk::RED),
bg: RGB::named(rltk::BLACK),
})
.with(LeftMover {})
.build();
}
rltk::main_loop(context, gs)
}