1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
use ggez::graphics::spritebatch::SpriteBatch;
use ggez::nalgebra::{distance, Point2};
use rand::Rng;
use std::f32::consts::PI;
use std::time::Instant;
use crate::animations::Animations;
use crate::constants;
use crate::entity::{Action, Entity, Operable};
use crate::map::Map;
use crate::tileset::Tileset;
#[derive(Clone)]
pub struct NPC {
entity: Entity,
behavior: Behavior,
animations: Animations,
}
impl Operable for NPC {
fn draw(&self, spritebatch: &mut SpriteBatch) {
self.animations.draw(spritebatch, self.entity.position);
}
fn update(&mut self) {
match self.behavior {
Behavior::Wandering(destination) => self.move_torwards(destination),
Behavior::Waiting(time) => self.wait(time),
}
self.entity.update();
self.animations.update(&self.entity.action);
}
}
impl NPC {
pub fn new(tileset: &Tileset, spawn: Point2<f32>, map_dimensions: (f32, f32)) -> NPC {
NPC {
entity: Entity::new(spawn, map_dimensions),
behavior: Behavior::Wandering(random_nearby_point(spawn, constants::WANDER_DISTANCE)),
animations: Animations::new(tileset),
}
}
fn move_torwards(&mut self, destination: Point2<f32>) {
let position = self.entity.position;
if distance(&position, &destination) < constants::GOAL_DISTANCE {
self.entity.action = Action::IdleRight;
self.behavior = Behavior::Waiting(Instant::now());
} else if (position.x - destination.x).abs() < constants::GOAL_DISTANCE {
if position.y > destination.y {
self.entity.action = Action::MovingUp;
} else {
self.entity.action = Action::MovingDown;
}
} else if (position.y - destination.y).abs() < constants::GOAL_DISTANCE {
if position.x > destination.x {
self.entity.action = Action::MovingLeft;
} else {
self.entity.action = Action::MovingRight;
}
} else if position.x > destination.x {
if position.y > destination.y {
self.entity.action = Action::MovingUpLeft;
} else {
self.entity.action = Action::MovingDownLeft;
}
} else if position.x < destination.x {
if position.y > destination.y {
self.entity.action = Action::MovingUpRight;
} else {
self.entity.action = Action::MovingDownRight;
}
}
}
fn wait(&mut self, start: Instant) {
if start.elapsed().as_secs() > constants::WAIT_TIME {
self.behavior = Behavior::Wandering(random_nearby_point(
self.entity.spawn,
constants::WANDER_DISTANCE,
));
}
}
pub fn build_npcs(tileset: &Tileset, map: &Map) -> Vec<NPC> {
let mut npcs = Vec::new();
for point in map.get_spawn_points("peasant") {
npcs.push(NPC::new(tileset, point, map.get_dimensions()));
}
npcs
}
}
#[derive(Clone)]
enum Behavior {
Waiting(Instant),
Wandering(Point2<f32>),
}
pub fn random_nearby_point(origin: Point2<f32>, within_radius: f32) -> Point2<f32> {
let w = within_radius * rand::thread_rng().gen_range(0.0, 1.0);
let t = 2.0 * PI * rand::thread_rng().gen_range(0.0, 1.0);
Point2::new(origin.x + w * t.cos(), origin.y + w * t.sin())
}
|
