roguelike-game/src/player.rs
2021-11-09 15:50:42 -05:00

173 lines
5.6 KiB
Rust

use crate::components::{
CombatStats, Item, Player, Position, Viewshed, WantsToMelee, WantsToPickupItem,
};
use crate::{game_log::GameLog, Map, RunState, State, TileType};
use rltk::{Point, Rltk, VirtualKeyCode};
use specs::prelude::*;
use std::cmp::{max, min};
pub fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
let mut positions = ecs.write_storage::<Position>();
let players = ecs.read_storage::<Player>();
let mut viewsheds = ecs.write_storage::<Viewshed>();
let entities = ecs.entities();
let combat_stats = ecs.read_storage::<CombatStats>();
let map = ecs.fetch::<Map>();
let mut wants_to_melee = ecs.write_storage::<WantsToMelee>();
for (entity, _player, pos, viewshed) in
(&entities, &players, &mut positions, &mut viewsheds).join()
{
if pos.x + delta_x < 1
|| pos.x + delta_x > map.width - 1
|| pos.y + delta_y < 1
|| pos.y + delta_y > map.height - 1
{
return;
}
let destination_idx = map.xy_idx(pos.x + delta_x, pos.y + delta_y);
for potential_target in map.tile_content[destination_idx].iter() {
let target = combat_stats.get(*potential_target);
if let Some(_target) = target {
wants_to_melee
.insert(
entity,
WantsToMelee {
target: *potential_target,
},
)
.expect("Add target failed");
return;
}
}
if !map.blocked[destination_idx] {
pos.x = min(79, max(0, pos.x + delta_x));
pos.y = min(49, max(0, pos.y + delta_y));
viewshed.dirty = true;
let mut ppos = ecs.write_resource::<Point>();
ppos.x = pos.x;
ppos.y = pos.y;
}
}
}
pub fn player_input(gs: &mut State, ctx: &mut Rltk) -> RunState {
// Player movement
match ctx.key {
None => return RunState::AwaitingInput, // Nothing happened
Some(key) => match key {
// Cardinal directions
VirtualKeyCode::Left
| VirtualKeyCode::Numpad4
| VirtualKeyCode::H
| VirtualKeyCode::Key4 => try_move_player(-1, 0, &mut gs.ecs),
VirtualKeyCode::Right
| VirtualKeyCode::Numpad6
| VirtualKeyCode::L
| VirtualKeyCode::Key6 => try_move_player(1, 0, &mut gs.ecs),
VirtualKeyCode::Up
| VirtualKeyCode::Numpad8
| VirtualKeyCode::K
| VirtualKeyCode::Key8 => try_move_player(0, -1, &mut gs.ecs),
VirtualKeyCode::Down
| VirtualKeyCode::Numpad2
| VirtualKeyCode::J
| VirtualKeyCode::S
| VirtualKeyCode::Key2 => try_move_player(0, 1, &mut gs.ecs),
// Diagonals
VirtualKeyCode::Numpad9 | VirtualKeyCode::Y | VirtualKeyCode::Key9 => {
try_move_player(1, -1, &mut gs.ecs)
}
VirtualKeyCode::Numpad7 | VirtualKeyCode::U | VirtualKeyCode::Key7 => {
try_move_player(-1, -1, &mut gs.ecs)
}
VirtualKeyCode::Numpad3 | VirtualKeyCode::N | VirtualKeyCode::Key3 => {
try_move_player(1, 1, &mut gs.ecs)
}
VirtualKeyCode::Numpad1 | VirtualKeyCode::B | VirtualKeyCode::Key1 => {
try_move_player(-1, 1, &mut gs.ecs)
}
// Pick up item
VirtualKeyCode::G => get_item(&mut gs.ecs),
// Show inventory
VirtualKeyCode::I => return RunState::ShowInventory,
// Show item drop screen
VirtualKeyCode::D => return RunState::ShowDropItem,
// Save and Quit
VirtualKeyCode::Escape => return RunState::SaveGame,
// Level changes
VirtualKeyCode::Period => {
if try_next_level(&mut gs.ecs) {
return RunState::NextLevel;
}
}
_ => return RunState::AwaitingInput,
},
}
RunState::PlayerTurn
}
fn get_item(ecs: &mut World) {
let player_pos = ecs.fetch::<Point>();
let player_entity = ecs.fetch::<Entity>();
let entities = ecs.entities();
let items = ecs.read_storage::<Item>();
let positions = ecs.read_storage::<Position>();
let mut gamelog = ecs.fetch_mut::<GameLog>();
let mut target_item: Option<Entity> = None;
for (item_entity, _item, position) in (&entities, &items, &positions).join() {
if position.x == player_pos.x && position.y == player_pos.y {
target_item = Some(item_entity);
}
}
match target_item {
None => gamelog
.entries
.push("There is nothing here to pick up.".to_string()),
Some(item) => {
let mut pickup = ecs.write_storage::<WantsToPickupItem>();
pickup
.insert(
*player_entity,
WantsToPickupItem {
collected_by: *player_entity,
item,
},
)
.expect("Unable to pick up item?!");
}
}
}
pub fn try_next_level(ecs: &mut World) -> bool {
let player_pos = ecs.fetch::<Point>();
let map = ecs.fetch::<Map>();
let player_idx = map.xy_idx(player_pos.x, player_pos.y);
if map.tiles[player_idx] == TileType::DownStairs {
true
} else {
let mut gamelog = ecs.fetch_mut::<GameLog>();
gamelog
.entries
.push("There is no way down from here.".to_string());
false
}
}