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use crate::{Direction, Entity, EntityMoveSpeed, Pos, Tile, astar};
pub const MIN_ROAM_DIST: u16 = 1;
pub const MAX_ROAM_DIST: u16 = 4;
pub const ZOMBIE_HEALTH: u32 = 50;
pub const ENEMY_VISION_RADIUS: u16 = 5;
pub const IDLE_WAIT: f32 = 1.;
#[derive(Clone, Debug, PartialEq)]
pub enum EnemyMoveState {
Idle(f32),
Roam(Vec<Pos>),
Attack(Vec<Pos>),
}
impl EnemyMoveState {
pub fn new_idle() -> Self {
Self::Idle(0.)
}
pub fn new_attack(starting_pos: Pos, player_pos: Pos, tiles: &[Tile]) -> Option<Self> {
if player_pos.manhattan(starting_pos) < ENEMY_VISION_RADIUS {
let data = astar::find_path(tiles, starting_pos, player_pos)?;
let mut path = data.0;
path.reverse();
return Some(Self::Attack(path));
}
None
}
pub fn new_roam(starting_pos: Pos, tiles: &[Tile]) -> Self {
let mut rand_dir = Direction::get_random_dir();
let mut rand_tiles = rand::random_range(MIN_ROAM_DIST..=MAX_ROAM_DIST);
let mut loop_index = 0;
loop {
if let Some(p) = starting_pos.step_by(rand_dir, rand_tiles) {
if !tiles[p.idx()].is_wall() {
if let Some(data) = astar::find_path(tiles, starting_pos, p) {
let mut path = data.0;
path.reverse();
return Self::Roam(path);
}
}
}
rand_dir = Direction::get_random_dir();
rand_tiles = rand::random_range(MIN_ROAM_DIST..=MAX_ROAM_DIST);
// Safety check
loop_index += 1;
assert!(
loop_index < 100,
"EnemyMoveState::new_roam couldn't find a valid spot around {starting_pos:?} in between {MIN_ROAM_DIST}-{MAX_ROAM_DIST} tiles",
);
}
}
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum EnemyAttackType {
Melee,
Ranged,
}
#[derive(Clone, Debug, PartialEq, Eq, Copy)]
pub enum EnemyType {
Zombie,
}
#[derive(Clone, Debug, PartialEq)]
pub struct Enemy {
pub entity: Entity,
pub enemy_type: EnemyType,
pub attack_type: EnemyAttackType,
move_state: EnemyMoveState,
}
impl Enemy {
pub fn new(enemy_type: EnemyType, pos: Pos) -> Self {
match enemy_type {
EnemyType::Zombie => Self::zombie(pos),
}
}
fn _new(
pos: Pos,
health: u32,
move_speed: EntityMoveSpeed,
enemy_type: EnemyType,
attack_type: EnemyAttackType,
) -> Self {
let entity = Entity::enemy(pos, move_speed, health);
Self {
entity,
enemy_type,
attack_type,
move_state: EnemyMoveState::new_idle(),
}
}
fn zombie(pos: Pos) -> Self {
Self::_new(
pos,
ZOMBIE_HEALTH,
EntityMoveSpeed::Slow,
EnemyType::Zombie,
EnemyAttackType::Melee,
)
}
pub fn handle_movement(&mut self, player_pos: Pos, delta_time: f32, tiles: &[Tile]) {
// Check if player is in range
if !matches!(self.move_state, EnemyMoveState::Attack { .. })
&& let Some(move_state) =
EnemyMoveState::new_attack(self.entity.pos, player_pos, tiles)
{
self.move_state = move_state;
return;
}
match &mut self.move_state {
EnemyMoveState::Idle(idle_accum) => {
*idle_accum += delta_time;
if *idle_accum < IDLE_WAIT {
return;
}
self.move_state = EnemyMoveState::new_roam(self.entity.pos, tiles);
}
EnemyMoveState::Roam(moves) => {
let p = if let Some(p) = moves.last() {
p
} else {
self.move_state = EnemyMoveState::new_idle();
return;
};
Self::movement_helper(&mut self.entity, *p, moves, delta_time);
}
EnemyMoveState::Attack(moves) => {
// Stop at one move left so the enemy is flush with the player tile
if moves.len() == 1 {
return;
}
Self::movement_helper(
&mut self.entity,
*moves.last().unwrap_or(&Pos::default()),
moves,
delta_time,
);
}
}
}
fn movement_helper(
entity: &mut Entity,
next_move: Pos,
moves: &mut Vec<Pos>,
delta_time: f32,
) {
if entity.pos.y() > next_move.y() {
entity.move_by_dir(Direction::North, delta_time);
if entity.fpos.y() <= next_move.y() as f32 {
if let Some(p) = moves.pop() {
entity.pos = p;
}
}
} else if entity.pos.y() < next_move.y() {
entity.move_by_dir(Direction::South, delta_time);
if entity.fpos.y() >= next_move.y() as f32 {
if let Some(p) = moves.pop() {
entity.pos = p;
}
}
} else if entity.pos.x() < next_move.x() {
entity.move_by_dir(Direction::East, delta_time);
if entity.fpos.x() >= next_move.x() as f32 {
if let Some(p) = moves.pop() {
entity.pos = p;
}
}
} else {
entity.move_by_dir(Direction::West, delta_time);
if entity.fpos.x() <= next_move.x() as f32 {
if let Some(p) = moves.pop() {
entity.pos = p;
}
}
};
}
}
|
